Alert archive / California / Flood Watches in 2021
Flood Watch 1, NWS San Diego, CA
NWS San Diego, CA issued this flood watch at Dec 13, 2021, 10:42 AM PST for 4 counties in California. It took effect at Dec 14, 2021, 6:00 AM PST. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Dec 13, 2021, 10:42 AM PST (18:42 UTC)
- In effect from
- Dec 14, 2021, 6:00 AM PST
- Expired
- Dec 14, 2021, 9:00 PM PST
- In force
- 15 hr
- 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 nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 6.7 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.
- Mixed-layer CAPE
- 8 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 795 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
204
WGUS66 KSGX 131842
FFASGX
URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service San Diego CA
1042 AM PST Mon Dec 13 2021
CAZ043-048-050-055>058-060-552-554-140245-
/O.NEW.KSGX.FA.A.0001.211214T1400Z-211215T0500Z/
/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-
Orange County Coastal Areas-Orange County Inland Areas-
Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove,
Fontana, Garden Grove, Fullerton, Lucerne Valley, Apple Valley,
Hesperia, Santa Ana, National City, Riverside, Poway, Big Bear Lake,
Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El
Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San
Clemente, Wrightwood, Corona, Anaheim, Huntington Beach,
Victorville, San Bernardino, Moreno Valley, Mission Viejo, Laguna
Beach, Julian, Pine Valley, Orange, Costa Mesa, La Mesa, Encinitas,
Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga
1042 AM PST Mon Dec 13 2021
...FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...
* WHAT...Flash flooding on Tuesday is possible due to excessive
rainfall through the day with isolated afternoon thunderstorms.
Rainfall rates of 0.50-0.60 inches per hour expected Tuesday.
Higher rainfall rates are expected on coastal mountain slopes,
particularly the San Bernardino Mountains, with rainfall rates of
0.75 inches an hour expected.
* WHERE...A portion of Southern California, including the following
areas, Apple and Lucerne Valleys, Orange County Coastal Areas,
Orange County Inland Areas, Riverside County Mountains below 5000
feet, San Bernardino County Mountains below 5000 feet, San
Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Coastal Areas, San Diego County Mountains below 5000
feet, San Diego County Valleys and Santa Ana Mountains and
Foothills. This Watch includes the Apple, El Dorado and Bond burn
scars.
* WHEN...From Tuesday morning through Tuesday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Debris flows and flash flooding are possible near recent burn
scars, including the Apple, El Dorado and Bond burn scars.
* ADDITIONAL DETAILS...
- A winter storm will bring significant precipitation to the
area. Forecast rainfall amounts across the area include 1-1.5
inches west of the mountains, 2-3 inches along the San Diego
and Riverside county mountains below 5000 feet, 2-5+ inches
below 5000 feet in the San Bernardino mountains, and
0.50-1.25 inches in the High Desert.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.
&&
$$
CO4 follow-up statements
872
WGUS66 KSGX 132126
FFASGX
Flood Watch
National Weather Service San Diego CA
126 PM PST Mon Dec 13 2021
CAZ043-048-050-055>058-060-552-554-140615-
/O.CON.KSGX.FA.A.0001.211214T1400Z-211215T0500Z/
/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-
Orange County Coastal Areas-Orange County Inland Areas-
Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove,
Fontana, Garden Grove, Fullerton, Lucerne Valley, Apple Valley,
Hesperia, Santa Ana, National City, Riverside, Poway, Big Bear Lake,
Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El
Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San
Clemente, Wrightwood, Corona, Anaheim, Huntington Beach,
Victorville, San Bernardino, Moreno Valley, Mission Viejo, Laguna
Beach, Julian, Pine Valley, Orange, Costa Mesa, La Mesa, Encinitas,
Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga
126 PM PST Mon Dec 13 2021
...FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH
TUESDAY EVENING...
* WHAT...Flash flooding on Tuesday is possible due to excessive
rainfall through the day with isolated afternoon thunderstorms.
Rainfall rates of 0.50-0.60 inches per hour expected Tuesday.
Higher rainfall rates are expected on coastal mountain slopes,
particularly the San Bernardino Mountains, with rainfall rates of
0.75 inches an hour expected.
* WHERE...A portion of Southern California, including the following
areas, Apple and Lucerne Valleys, 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 Mountains, San Diego County Valleys and Santa Ana
Mountains and Foothills. This Watch includes the Apple, El Dorado
and Bond burn scars.
* WHEN...From Tuesday morning through Tuesday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Debris flows and flash flooding are possible near recent burn
scars, including the Apple, El Dorado and Bond burn scars.
* ADDITIONAL DETAILS...
- A winter storm will bring significant precipitation to the
area. Forecast rainfall amounts across the area include 1-1.5
inches west of the mountains, 2-3 inches along the San Diego
and Riverside county mountains below 5000 feet, 2-5+ inches
below 5000 feet in the San Bernardino mountains, and 0.50-1
inch in the High Desert.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.
&&
$$
CO501
WGUS66 KSGX 140500
FFASGX
Flood Watch
National Weather Service San Diego CA
900 PM PST Mon Dec 13 2021
CAZ043-048-050-055>058-060-552-554-141400-
/O.CON.KSGX.FA.A.0001.211214T1400Z-211215T0500Z/
/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-
Orange County Coastal Areas-Orange County Inland Areas-
Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove,
Fontana, Garden Grove, Fullerton, Lucerne Valley, Apple Valley,
Hesperia, Santa Ana, National City, Riverside, Poway, Big Bear Lake,
Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El
Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San
Clemente, Wrightwood, Corona, Anaheim, Huntington Beach,
Victorville, San Bernardino, Moreno Valley, Mission Viejo, Laguna
Beach, Julian, Pine Valley, Orange, Costa Mesa, La Mesa, Encinitas,
Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga
900 PM PST Mon Dec 13 2021
...FLOOD WATCH REMAINS IN EFFECT FROM 6 AM TUESDAY THROUGH TUESDAY
EVENING...
* WHAT...Flash flooding on Tuesday is possible due to excessive
rainfall through the day with isolated afternoon thunderstorms.
Rainfall rates of 0.50-0.60 inches per hour expected Tuesday.
Higher rainfall rates are expected on coastal mountain slopes,
particularly the San Bernardino Mountains, with rainfall rates of
0.75 inches an hour expected.
* WHERE...A portion of Southern California, including the following
areas, Apple and Lucerne Valleys, 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 Mountains, San Diego County Valleys and Santa Ana
Mountains and Foothills.
* WHEN...From 6 AM Tuesday through Tuesday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Debris flows and flash flooding are possible near recent burn
scars, including the Apple, El Dorado and Bond burn scars.
* ADDITIONAL DETAILS...
- A winter storm will bring significant precipitation to the
area. Forecast rainfall amounts across the area include 1-1.5
inches west of the mountains, 2-3 inches along the San Diego
and Riverside county mountains below 5000 feet, 2-5+ inches
below 5000 feet in the San Bernardino mountains, and 0.50-1
inch in the High Desert.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.
&&
$$
Moede163
WGUS66 KSGX 141348
FFASGX
Flood Watch
National Weather Service San Diego CA
548 AM PST Tue Dec 14 2021
CAZ043-048-050-055>058-060-552-554-142200-
/O.CON.KSGX.FA.A.0001.211214T1400Z-211215T0500Z/
/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-
Orange County Coastal Areas-Orange County Inland Areas-
Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove,
Fontana, Garden Grove, Fullerton, Lucerne Valley, Apple Valley,
Hesperia, Santa Ana, National City, Riverside, Poway, Big Bear Lake,
Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El
Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San
Clemente, Wrightwood, Corona, Anaheim, Huntington Beach,
Victorville, San Bernardino, Moreno Valley, Mission Viejo, Laguna
Beach, Julian, Pine Valley, Orange, Costa Mesa, La Mesa, Encinitas,
Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga
548 AM PST Tue Dec 14 2021
...FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...
* WHAT...Flooding caused by excessive rainfall continues to be
possible.
* WHERE...A portion of Southern California, including the following
areas, Apple and Lucerne Valleys, 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 Mountains, San Diego County Valleys and Santa Ana
Mountains and Foothills.
* WHEN...Through this evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
* ADDITIONAL DETAILS...
- A winter storm will bring significant precipitation to the
area. Forecast rainfall amounts across the area include 1-1.5
inches west of the mountains, 2-3 inches along the San Diego
and Riverside county mountains below 5000 feet, 2-6+ inches
below 5000 feet in the San Bernardino mountains, and
0.50-1.25 inch in the High Desert.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.
&&
$$
MM626
WGUS66 KSGX 142110
FFASGX
Flood Watch
National Weather Service San Diego CA
110 PM PST Tue Dec 14 2021
CAZ043-048-050-055>058-060-552-554-150500-
/O.CON.KSGX.FA.A.0001.000000T0000Z-211215T0500Z/
/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-
Orange County Coastal Areas-Orange County Inland Areas-
Including the cities of Vista, Ontario, Santee, Idyllwild-Pine Cove,
Fontana, Garden Grove, Fullerton, Lucerne Valley, Apple Valley,
Hesperia, Santa Ana, National City, Riverside, Poway, Big Bear Lake,
Oceanside, Big Bear City, San Diego, Lake Arrowhead, Irvine, El
Cajon, Newport Beach, Escondido, Chula Vista, Crestline, San
Clemente, Wrightwood, Corona, Anaheim, Huntington Beach,
Victorville, San Bernardino, Moreno Valley, Mission Viejo, Laguna
Beach, Julian, Pine Valley, Orange, Costa Mesa, La Mesa, Encinitas,
Running Springs, San Marcos, Carlsbad, and Rancho Cucamonga
110 PM PST Tue Dec 14 2021
...FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM PST THIS EVENING...
* WHAT...Flooding and localized flash flooding caused by excessive
rainfall and isolated thunderstorms continues to be possible
through this evening. Rainfall rates of 0.50 to 0.60 inches an
hour, locally up to 0.75 inches an hour at times expected through
late this afternoon.
* WHERE...A portion of Southern California, including the following
areas, Apple and Lucerne Valleys, 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 Mountains, San Diego County Valleys and Santa Ana
Mountains and Foothills. This watch includes the Apple, El Dorado,
and Bond burn scars.
* WHEN...Until 9 PM PST this evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Debris flow and flash flooding are possible, especially near
recent burn scars, including Apple, El Dorado, and Bond burn scars.
* ADDITIONAL DETAILS...
- A winter storm will bring significant precipitation to the
area. Additional rainfall amounts of 0.50-1.5 inch west of
the mountains, 2-3 inches along the San Diego and Riverside
county mountains below 5000 feet, 2-4 inches below 5000 feet
in the San Bernardino mountains, and 0.50 inch in the High
Desert are possible.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.
&&
$$
COThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 5:03 PM PST | Gale Warning | SGX | 59 hr | |
| Dec 13, 3:50 AM PST | High Wind Warning | SGX | Riverside, San Bernardino, San Diego | 44 hr |
| Dec 13, 3:50 AM PST | Wind Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 44 hr |
| Dec 13, 3:53 AM PST | Winter Storm Warning | SGX | Riverside, San Bernardino | 44 hr |
| Dec 13, 1:07 PM PST | High Surf Advisory | SGX | Orange, San Diego | 49 hr |
Nearby
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.