Alert archive / California / Flash Flood Watches in 2020

Flash Flood Watch 2, NWS San Diego, CA

April 6, 20204 counties in California

NWS San Diego, CA issued this flash flood watch at Apr 6, 2020, 1:02 PM PDT for 4 counties in California. It took effect at Apr 7, 2020, 11:00 AM PDT. It was in force for 3 days.

The area

The counties it named.

The facts

Issued
Apr 6, 2020, 1:02 PM PDT (20:02 UTC)
In effect from
Apr 7, 2020, 11:00 AM PDT
Expired
Apr 10, 2020, 8:00 PM PDT
In force
3 days
Issued by
NWS San Diego, CA
Flood severity
None

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 20:05 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 8.0 hours before the alert went out and 124 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 12:00Z on 2020-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2020-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
18 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

086 
WGUS66 KSGX 062002
FFASGX

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
102 PM PDT Mon Apr 6 2020

...Flash Flood Watch Tuesday through Wednesday...

.A slow-moving storm off the central California coast will 
approach southern California and move inland late Tuesday through
Wednesday. With high moisture availability and increasing 
instability, the threat for thunderstorms and heavy showers will 
bring areas of urban and small stream flooding, with isolated 
flash flooding possible as well from the coast to the desert 
areas.


CAZ043-048-050-055>058-060>062-065-552-554-070500-
/O.NEW.KSGX.FF.A.0002.200407T1800Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
102 PM PDT Mon Apr 6 2020

...FLASH FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH
WEDNESDAY EVENING...

The National Weather Service in San Diego has issued a

* Flash Flood Watch for a portion of southwest California...
  including the following...Apple and ...Lucerne Valleys... 
  Coachella Valley...Orange County Coastal Areas...Orange County 
  Inland Areas...Riverside County Mountains...San Bernardino 
  County Mountains...San Bernardino and Riverside County Valleys- 
  The Inland Empire...San Diego County Coastal Areas... San Diego 
  County Deserts...San Diego County Mountains...San Diego County 
  Valleys...San Gorgonio Pass Near Banning and Santa Ana Mountains
  and Foothills. 

* A cold, late season storm will bring an elevated risk of heavy
  rain and flash flooding

* From late Tuesday morning through Wednesday evening

* There is a potential for thunderstorms and areas of heavy slow-
  moving showers to develop.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding.  Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take
action should Flash Flood Warnings be issued.

&&

$$

10
14 follow-up statements
164 
WGUS66 KSGX 070333
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
833 PM PDT Mon Apr 6 2020

...Flash Flood Watch Tuesday through Wednesday...

.A slow-moving storm off the central California coast will move 
inland across Southern California Tuesday and Wednesday. Scattered
showers and isolated thunderstorms with the moderate to heavy rain 
will bring areas of urban and small stream flooding. Isolated 
flash flooding is possible in the heaviest downpours. 

CAZ043-048-050-055>058-060>062-065-552-554-071300-
/O.CON.KSGX.FF.A.0002.200407T1800Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
833 PM PDT Mon Apr 6 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY MORNING
THROUGH WEDNESDAY EVENING...

The Flash Flood Watch continues for

* A portion of southwest California...including the Apple and
  Lucerne Valleys...the Coachella Valley...all of Orange
  County...the Riverside County Mountains...the San Bernardino
  County Mountains...the Inland Empire...and all of San Diego
  County.

* From late Tuesday morning through Wednesday evening

* There is the threat for showers and thunderstorms with heavy
  rain.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should 
Flash Flood Warnings be issued.

&&

$$

Moede
834 
WGUS66 KSGX 070919
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
219 AM PDT Tue Apr 7 2020

...Flash Flood Watch Tuesday through Wednesday...

.A slow-moving low pressure system southwest of Point Conception
will move slowly toward the southeast and east moving inland  
across Southern California on Wednesday. Scattered showers and 
isolated thunderstorms with moderate to heavy rainfall will bring
areas of urban and small stream flooding. Isolated flash flooding
is possible in the heaviest downpours.

CAZ043-048-050-055>058-060>062-065-552-554-072200-
/O.CON.KSGX.FF.A.0002.200407T1800Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
219 AM PDT Tue Apr 7 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 11 AM PDT THIS
MORNING THROUGH WEDNESDAY EVENING...

The Flash Flood Watch continues for

* All of extreme southwestern California below the snow level. 

* From 11 AM PDT this morning through Wednesday evening

* There is the threat for showers and thunderstorms with heavy 
  rainfall. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

17
375 
WGUS66 KSGX 072039
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
139 PM PDT Tue Apr 7 2020

...Flash Flood Watch Tuesday through Wednesday...

.A slow-moving low pressure system southwest of Point Conception
will move slowly toward the southeast and east moving inland
across Southern California on Wednesday. Scattered showers and
isolated thunderstorms with moderate to heavy rainfall will bring
areas of urban and small stream flooding. Isolated flash flooding
is possible in the heaviest downpours.

CAZ043-048-050-055>058-060>062-065-552-554-080445-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
139 PM PDT Tue Apr 7 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY
EVENING...

The Flash Flood Watch continues for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* through Wednesday evening

* There is the threat for showers and thunderstorms with heavy
  rainfall. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

SS
772 
WGUS66 KSGX 080412
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
912 PM PDT Tue Apr 7 2020

...Flash Flood Watch through Wednesday...

.A slow-moving trough of low pressure will slowly move across Southern
California Wednesday. Scattered showers and isolated thunderstorms
with moderate to heavy rainfall are likely. Isolated flash flooding
is possible in the heaviest downpours.

CAZ043-048-050-055>058-060>062-065-552-554-081300-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
912 PM PDT Tue Apr 7 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY
EVENING...

The Flash Flood Watch continues for

* A portion of southwest California...including the Apple and
  Lucerne Valleys...the Coachella Valley...all of Orange
  County...the Riverside County Mountains...the San Bernardino
  County Mountains...the Inland Empire...and all of San Diego
  County.

* Through Wednesday evening

* Scattered showers and thunderstorms with heavy rainfall.
 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

Moede
224 
WGUS66 KSGX 081001
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
301 AM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH THROUGH 7 PM TODAY BELOW 5000 FEET...

.A low pressure system will nove slowly toward the southern 
California coast today. This will bring numerous showers today 
with a chance of thunderstorms with periods of heavy rainfall 
possible. Isolated flash flooding is possible with thunderstorms 
and where showers track repeatedly across the same area.

CAZ043-048-050-055>058-060>062-065-552-554-082245-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
301 AM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...

The Flash Flood Watch continues for

* All of extreme southwestern California below 5000 feet. 

* Through 7 PM today.

* Numerous showers and a chance of thunderstorms with periods of
  heavy rainfall possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

17
089 
WGUS66 KSGX 082014
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
114 PM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH THROUGH 7 PM TODAY BELOW 5000 FEET...

.A low pressure system will nove slowly across the California 
Bight today. This will bring numerous showers today with a chance 
of thunderstorms with periods of heavy rainfall possible. Isolated
flash flooding is possible with thunderstorms and where showers 
track repeatedly across the same area.

CAZ043-048-050-055>058-060>062-065-552-554-090200-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200409T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
114 PM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM PDT THIS
EVENING...

The Flash Flood Watch continues for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* until 7 PM PDT this evening

* Numerous showers and a chance of thunderstorms with periods of
  heavy rainfall possible. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

SS
454 
WGUS66 KSGX 090202
FFASGX

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
702 PM PDT Wed Apr 8 2020

...Flash Flood Watch has been extended through Friday...

.A low pressure system will move slowly across the region 
Thursday through Friday. This will bring a renewed round of 
potentially heavy rain, especially from Thursday evening through 
Friday morning. Isolated flash flooding will be possible, as well 
as significant urbanized flooding. 

CAZ043-048-050-055>058-060>062-065-552-554-091015-
/O.EXT.KSGX.FF.A.0002.000000T0000Z-200411T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
702 PM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH NOW IN EFFECT THROUGH FRIDAY AFTERNOON...

The Flash Flood Watch is now in effect for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* through Friday afternoon

* Numerous showers with periods of heavy rainfall, especially for
  Thursday evening through Friday morning. Thunderstorms also possible
  late Thursday night and Friday.
 
* Additional heavy rainfall on already soaked ground could cause
  renewed flooding problems for much of the area. Additional
  amounts of 1 to 2 inches, with isolated totals of 3 inches along
  the coastal slopes. Deserts will see between one half to one
  inch additional. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

jmb
786 
WGUS66 KSGX 090405
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
905 PM PDT Wed Apr 8 2020

...Flash Flood Watch has been extended through Friday...

.A low pressure system will move slowly across the region 
Thursday through Friday. This will bring a renewed round of 
potentially heavy rainfall, especially from Thursday evening 
through Friday morning. Isolated flash flooding will be possible, 
as well as significant urbanized flooding risk.

CAZ043-048-050-055>058-060>062-065-552-554-091300-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200411T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
905 PM PDT Wed Apr 8 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON...

The Flash Flood Watch continues for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* through Friday afternoon

* Numerous showers through Friday. The main threat for heavy
  rainfall will come from Thursday evening through Friday 
  morning. Thunderstorms also possible late Thursday night and 
  Friday. 

* Additional heavy rainfall on already soaked ground could cause
  renewed flooding problems for much of the area. Additional
  amounts of 1 to 2 inches, with isolated spots along the coastal
  slopes of up to 3 inches. For the deserts around one-half inch
  additional rainfall, with a few spots up to one inch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

jmb
011 
WGUS66 KSGX 090939
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
239 AM PDT Thu Apr 9 2020

CAZ043-048-050-055>058-060>062-065-552-554-092230-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200411T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
239 AM PDT Thu Apr 9 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON...

The Flash Flood Watch continues for

* All of extreme southwestern California below 5500 feet. 

* Through Friday afternoon.

* Periods of showers will continue through Friday along with a
  slight chance for thunderstorms Friday afternoon.

* Brief heavy rainfall on saturated soil will increase the
  potential for urban and small stream flooding. Isolated flash
  flooding is possible with thunderstorms and where showers track
  repeatedly across the same area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

17
650 
WGUS66 KSGX 092000
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
Issued by National Weather Service San Francisco CA
100 PM PDT Thu Apr 9 2020

CAZ043-048-050-055>058-060>062-065-552-554-100500-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200411T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
100 PM PDT Thu Apr 9 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON...

The Flash Flood Watch continues for

* All of extreme southwestern California below 5500 feet. 

* Through Friday afternoon.

* Periods of showers will continue through Friday along with a 
  slight chance for thunderstorms Friday afternoon. 

* Brief heavy rainfall on saturated soil will increase the 
  potential for urban and small stream flooding. Isolated flash 
  flooding is possible with thunderstorms and where showers 
  track repeatedly across the same area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$
915 
WGUS66 KSGX 100448
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
948 PM PDT Thu Apr 9 2020

CAZ043-048-050-055>058-060>062-065-552-554-101300-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200411T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
948 PM PDT Thu Apr 9 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON...

The Flash Flood Watch continues for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* through Friday afternoon

* Showers will continue through Friday along with a slight chance
  for thunderstorms on Friday. 

* Heavy rainfall is expected over saturated soil, which will
  increase the potential for significant urbanized flooding.
  Isolated flash flooding is also possible with thunderstorms on
  Friday, and where showers track repeatedly across the same area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

jmb
810 
WGUS66 KSGX 101030
FFASGX

URGENT - IMMEDIATE BROADCAST REQUESTED
FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
330 AM PDT Fri Apr 10 2020

CAZ043-048-050-055>058-060>062-065-552-554-102230-
/O.EXT.KSGX.FF.A.0002.000000T0000Z-200411T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
330 AM PDT Fri Apr 10 2020

...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING...

The Flash Flood Watch is now in effect for

* All of extreme southwestern California below 5500 feet. 

* Until 8 PM this evening.

* Showers with widespread moderate to locally heavy rainfall will
  continue today below 5500 feet along with a chance of
  thunderstorms. The heaviest rainfall is expected across San 
  Diego County. 

* Heavy rainfall is expected over saturated soil, which will
  increase the potential for significant urbanized and flooding
  stream flooding, especially across San Diego County. Isolated
  flash flooding is also possible with thunderstorms and where 
  showers track repeatedly across the same area.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

17
362 
WGUS66 KSGX 102051
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
151 PM PDT Fri Apr 10 2020

CAZ043-048-050-055>058-060>062-065-552-554-110300-
/O.CON.KSGX.FF.A.0002.000000T0000Z-200411T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
151 PM PDT Fri Apr 10 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM PDT THIS
EVENING...

The Flash Flood Watch continues for

* A portion of southwest California...including the following... 
  Apple and ...Lucerne Valleys...Coachella Valley...Orange 
  County Coastal Areas...Orange County Inland Areas...Riverside 
  County Mountains...San Bernardino County Mountains...San 
  Bernardino and Riverside County Valleys-The Inland Empire... 
  San Diego County Coastal Areas...San Diego County Deserts... 
  San Diego County Mountains...San Diego County Valleys...San 
  Gorgonio Pass Near Banning and Santa Ana Mountains and 
  Foothills. 

* until 8 PM PDT this evening

* Showers with widespread moderate to locally heavy rainfall 
  will continue today below 5500 feet along with a chance of 
  thunderstorms. The heaviest rainfall is expected across San 
  Diego County. 

* Heavy rainfall is expected over saturated soil, which will 
  increase the potential for significant urbanized and flooding 
  stream flooding, especially across San Diego County. Isolated 
  flash flooding is also possible with thunderstorms and where 
  showers track repeatedly across the same area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor later forecasts and be prepared to take action should
Flash Flood Warnings be issued.

&&

$$

10
716 
WGUS66 KSGX 110321
FFASGX

FLOOD WATCH
NATIONAL WEATHER SERVICE San Diego CA
821 PM PDT Fri Apr 10 2020

CAZ043-048-050-055>058-060>062-065-552-554-110430-
/O.EXP.KSGX.FF.A.0002.000000T0000Z-200411T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Oceanside, Vista, Carlsbad, Encinitas, 
Chula Vista, National City, San Diego, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, 
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, 
Pine Valley, Victorville, Hesperia, Apple Valley, Lucerne Valley,
Indio, Palm Springs, Cathedral City, Palm Desert, 
Palm Desert Country, La Quinta, Coachella, Borrego Springs, 
Banning, Desert Hot Springs, Huntington Beach, Costa Mesa, 
Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, 
Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo
821 PM PDT Fri Apr 10 2020

...FLASH FLOOD WATCH HAS EXPIRED...

The Flash Flood Watch for A portion of southwest California has
expired. Additional flooding is no longer expected 
to pose a threat, however officials are reporting ongoing flooding 
problems in the Encinitas area, and there may still be flooded
streets in other areas. Please continue to heed any remaining 
road closures.

$$

jmb

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this flash flood watch went out at Apr 6, 8:48 AM PDT, 4 hours 14 minutes earlier.

Area forecast discussion, Apr 6, 8:48 AM PDT, 4 hours 14 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
848 AM PDT Mon Apr 6 2020

.SYNOPSIS...
A cold low pressure system off the central California coast will
move slowly southward through Tuesday, then swing east over Southern
California on Wednesday. It will keep the weather quite cool for
early April, and bring periods of rain, mountain snow, and isolated
thunderstorms through Thursday. The low may spin over the region
through Friday, continuing the threat of rain and mountains
snowfall. The storm system should be east of the region this
weekend, setting up dry and warmer weather.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Scattered, mostly light rain has fallen over most areas along and
west of the mts this morning, By far, the heaviest has been on the
coastal slopes of the San Bernardino and Santa Ana Mts, where an
inch or more has fallen in some spots. Snow is falling with some
accumulating above 6200 FT, and could be heavy above 6500 FT. The
onshore sfc pressure gradients have relaxed a bit, but peak wind
gusts are still 45-55 MPH in the windiest spots.

Looks like snow levels may remain elevated (mostly above 6200 FT)
today, then gradually fall off over western areas tonight. This
should keep any heavy accumulations of snow above 6500 FT today and
above 6000 FT tonight and Tuesday. Tuesday night and Wednesday,
further drops in the snow level are likely. A minor forecast update
was issued to raise snow levels in the near term, and add
thunderstorm chances to more zones later Tue/Wed.

Previous discussion...

A closed upper level low pressure system is centered off the
northern and central California coast early this morning with a
plume of subtropical moisture with precipitable water values
exceeding one inch directed into southern California. There have
been scattered showers overnight along and west of the mountains
with the more widespread precipitation from Los Angeles County
westward.

Stronger and gusty south to southwest winds ahead of the cold
front for this morning into this afternoon will gust to around 35
mph near the coast and gust to around 50 mph near mountain ridge
tops and desert mountains slopes. Winds will gradually subside
tonight into Tuesday.

Periods of showers will continue behind the front for tonight into
Thursday along with a slight chance for thunderstorms for Tuesday
afternoon and evening and again on Wednesday.

This low pressure system could linger in vicinity of southern
California for Friday into the weekend which would maintain below
average temperatures with small chances for mainly light
precipitation.

&&

.AVIATION...
061530Z...Coast/Valleys/Mountains...Heaviest rainfall will impact
KSNA/KONT/KSBD/KSNA through 20Z. After 20, it will shift east of
these areas and impact KCRQ/KSAN. Expect periods of MVFR ceilings
(1000-1500 ft MSL) and visibilities of 1-4SM in the heavier
rainfall. Outside of the heaviest rain expect BKN ceilings 2500-3500
ft MSL along with VCSH. Higher terrain mostly obscured. A slight
chance of TSRA afternoon and evening, but too low of a probability
to mention in the TAFs. A few hours of strong south wind gusts
expected at KSAN until front passes with gusts to 30 kts possible 16-
19Z. Winds along mountain crests and desert slopes 25-35 kts, gusts
to 45 kts. For all areas, expect the precip to become more showery
in nature after 04Z. During this period and through the overnight
hours expect scattered -SHRA and cigs 2000-3000 feet MSL.

Deserts...Rain occurring in the high desert and expect -RA to begin
in the lower deserts early afternoon. Expect ceilings down to 4000
feet MSL and local vis 3-5SM in +RA between 16-23Z high desert, 20-
03Z low desert. SFC winds in high desert gusting 25-35 kts,
decreasing after 23Z.

&&

.MARINE...
Strong southerly winds with gusts 20 to 30 knots today. There is
also a small chance of thunderstorms and waterspouts this afternoon
through tonight. Scattered thunderstorms become more likely for Tue
night into Wednesday. A Small Craft Advisory is in effect until
early this evening.

&&

.BEACHES...
Isolated thunderstorms with lightning possible this afternoon and
again Tuesday afternoon through Wednesday. Elevated surf through
this evening with sets up to 6 feet possible.

&&

.HYDROLOGY...
A low pressure system off the northern and central California
coast will move slowly southward through Tuesday, then slowly
eastward and inland across southern California and northern Baja
for Wednesday and Wednesday night. It will bring periods of heavy
precipitation today with periods of showers following for tonight
through Thursday.

The more widespread precipitation will continue this morning along
south facing mountain slopes with the cold front and more
widespread showers moving slowly east and southward across the
areas during the afternoon into the evening. There is a slight
chance of thunderstorms with the front, mainly for coastal and
valley areas from late morning into the afternoon.

Periods of showers will continue into Thursday. There is another
chance for thunderstorms Tuesday afternoon and evening and another
chance for Wednesday morning into the afternoon.

Through Thursday for Orange, southwestern San Bernardino, and
western Riverside Counties, rainfall is expected to range from 1.5
to 2 inches near the coast to 4 to 6 inches on south facing
mountains slopes with locally greater amounts to around 8 inches.
In high desert areas, 1 to 2 inches of rainfall is expected with
0.75 to 1.5 inches in the Coachella Valley.

For San Diego County, rainfall is expected to range from around 2
inches near the coast to 3 to 5 inches in the mountains with
around one half to one inch in the deserts. Local amounts to
around 6 inches are possible on southwest facing mountain slopes.

Snow levels near the 5500 to 6000 feet today, will lower to 4500
to 5000 feet for tonight through Wednesday, gradually rising to
5000 to 5500 feet Wednesday night, and 6000 to 6500 feet Thursday.

Through Wednesday evening in the mountains of San Bernardino and
Riverside Counties, total snow accumulations could range from 6
to 10 inches between 5,000 and 6,000 feet, 10 to 20 inches between
6,000 and 7,000 feet, and from 20 to 36 inches above 7,000 feet
with local amounts up to 48 inches on the highest peaks. The San
Diego County mountains could receive 3 to 6 inches above 5000
feet, mainly Tuesday night and Wednesday.

Urban and small stream flooding will be a possible for most areas
below the snow level. The greater potential for flash flooding
would be on Tuesday into Tuesday evening and again Wednesday with
thunderstorms or bands of showers training across the same areas.
There could also be flooding of low water crossings along the San
Diego River through Mission Valley. The Whitewater River could
flood low water crossings in the Coachella Valley.
&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Winter Storm Warning until 5 AM PDT Thursday for Riverside
     County Mountains-San Bernardino County Mountains.

PZ...Small Craft Advisory until 6 PM PDT this evening for Coastal
     Waters from San Mateo Point to the Mexican Border and out
     to 30 nm-Waters from San Mateo point to the Mexican Border
     Extending 30 to 60 nm out including San Clemente Island.

&&

PUBLIC...10/17
HYDROLOGY...17
AVIATION/MARINE/BEACHES...Moreland

In the hours before

Local storm report, Apr 6, 11:46 AM PDT, 1 hour 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1146 AM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1144 AM     HEAVY RAIN       7 SW CORONA             33.81N 117.67W
04/06/2020  M0.88 INCH       ORANGE             CA   TRAINED SPOTTER

            0.88 INCHES IN ONE HOUR IN SILVERADO CANYON
            ON 2 GAGES. WEATHER SPOTTER REPORTING
            INTENSE RAINFALL. SPOTTER REPORTS 1.91 NEW
            RAINFALL.

&&

AOT
Local storm report, Apr 6, 11:53 AM PDT, 1 hour 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1153 AM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1127 AM     HEAVY RAIN       1 N SAN BERNARDINO      34.11N 117.29W
04/06/2020  M1.00 INCH       SAN BERNARDINO     CA   TRAINED SPOTTER

            STREET FLOODING.

&&

AOT
Local storm report, Apr 6, 11:54 AM PDT, 1 hour 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1154 AM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1107 AM     HEAVY RAIN       2 NW SAN JUAN CAPISTRAN 33.53N 117.67W
04/06/2020  E1.00 INCH       ORANGE             CA   TRAINED SPOTTER

            NEAR 1 INCH IN 20 MINUTES. FLOODING IN SAN
            JUAN CAPISTRANO.

&&

AOT
Local storm report, Apr 6, 11:55 AM PDT, 1 hour 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1155 AM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1137 AM     HEAVY RAIN       3 W SAN JUAN CAPISTRANO 33.51N 117.70W
04/06/2020  M0.96 INCH       ORANGE             CA   TRAINED SPOTTER

            0.96 INCHES IN THE PRIOR 50 MINUTES.

&&

AOT
Local storm report, Apr 6, 12:42 PM PDT, 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1242 PM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1241 PM     HEAVY RAIN       2 NW SAN JUAN CAPISTRAN 33.52N 117.67W
04/06/2020  M0.94 INCH       ORANGE             CA   PUBLIC

            LOWER OSO CREEK GAUGE REPORTED 0.94 INCHES
            IN 1 HOUR.

&&

AOT
Local storm report, Apr 6, 12:59 PM PDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1259 PM PDT MON APR 6 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1258 PM     HEAVY RAIN       2 NNW LYTLE CREEK       34.28N 117.50W
04/06/2020  M4.00 INCH       SAN BERNARDINO     CA   MESONET

            GAUGE REPORTS 4 INCHES IN 12 HOURS AND 3
            INCHES IN 6 HOURS DURATION.

&&

AOT

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 6, 8:07 AM PDTAreal Flood AdvisorySGXOrange, Riverside, San Bernardino3 hr
Apr 6, 10:23 AM PDTFlash Flood WarningSGXOrange, Riverside, San Bernardino3 hr
Apr 6, 1:32 PM PDTAreal Flood AdvisorySGXRiverside, San Bernardino3 hr
Apr 6, 4:32 PM PDTAreal Flood AdvisorySGXRiverside, San Bernardino118 min

Nearby

Flash Flood Watches in California, 2020Every flash flood watch in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.