Alert archive / California / Freeze Warnings in 2020

Freeze Warning 2, NWS San Diego, CA

February 4, 2020Riverside County, San Bernardino County, San Diego County, California

NWS San Diego, CA issued this freeze warning at Feb 4, 2020, 5:00 AM PST for Riverside County, San Bernardino County, San Diego County, California. It took effect at Feb 4, 2020, 10:00 PM PST. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 4, 2020, 5:00 AM PST (13:00 UTC)
In effect from
Feb 4, 2020, 10:00 PM PST
Expired
Feb 5, 2020, 9:00 AM PST
In force
11 hr
Issued by
NWS San Diego, CA

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

The radar

The Santa Ana Mts radar (KSOX), 122 km from the middle of the area, began a volume at 13:00 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, 1.0 hours before the alert went out and 145 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 2020-02-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2020-02-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3353 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

979 
WWUS76 KSGX 041300
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
500 AM PST Tue Feb 4 2020

CAZ061-062-042200-
/O.CAN.KSGX.FZ.W.0001.000000T0000Z-200205T1800Z/
/O.NEW.KSGX.FZ.W.0002.200205T0800Z-200205T1600Z/
Coachella Valley-San Diego County Deserts-
Including the cities of Indio, Palm Springs, Cathedral City, Palm
Desert, Palm Desert Country, La Quinta, Coachella, and Borrego 
Springs
500 AM PST Tue Feb 4 2020

...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST
WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Coachella Valley and San Diego County Deserts.

* WHEN...From midnight tonight to 8 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ048-042200-
/O.NEW.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
/O.EXT.KSGX.FZ.W.0001.000000T0000Z-200204T1700Z/
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, and Corona
500 AM PST Tue Feb 4 2020

...FREEZE WARNING NOW IN EFFECT UNTIL 9 AM PST THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...
...FREEZE WARNING IN EFFECT FROM 10 PM THIS EVENING TO 9 AM PST
WEDNESDAY...

* WHAT...For the Freeze Warning this morning, sub-freezing
  temperatures as low as 30. For the Freeze Warning tonight, sub-
  freezing temperatures as low as 25 expected. For the Wind 
  Advisory, north winds 15 to 25 mph with gusts to 40 mph.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire.

* WHEN...For the Freeze Warning this morning, until 9 AM PST this
  morning. For the Freeze Warning tonight, from 10 PM this 
  evening to 9 AM PST Wednesday. For the Wind Advisory, until 9 AM
  PST Wednesday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.
  Frost and freeze conditions will kill crops, other sensitive
  vegetation and possibly damage unprotected outdoor plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ060-042200-
/O.NEW.KSGX.HZ.W.0002.200205T0200Z-200205T1800Z/
/O.EXT.KSGX.HZ.W.0001.000000T0000Z-200204T1800Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
500 AM PST Tue Feb 4 2020

...HARD FREEZE WARNING NOW IN EFFECT UNTIL 10 AM PST THIS
MORNING...
...HARD FREEZE WARNING IN EFFECT FROM 6 PM THIS EVENING TO 10 AM
PST WEDNESDAY...

* WHAT...For the Hard Freeze Warning this morning, sub-freezing
  temperatures as low as 20. For the Hard Freeze Warning tonight,
  sub- freezing temperatures as low as 21 expected.

* WHERE...Apple and Lucerne Valleys.

* WHEN...For the Hard Freeze Warning this morning, until 10 AM PST
  this morning. For the Hard Freeze Warning tonight, from 6 PM 
  this evening to 10 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CAZ050-042200-
/O.NEW.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
/O.EXT.KSGX.FZ.W.0001.000000T0000Z-200204T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, La Mesa,
Santee, and Poway
500 AM PST Tue Feb 4 2020

...FREEZE WARNING NOW IN EFFECT UNTIL 9 AM PST THIS MORNING...
...FREEZE WARNING IN EFFECT FROM 10 PM THIS EVENING TO 9 AM PST
WEDNESDAY...

* WHAT...For the Freeze Warning this morning, sub-freezing
  temperatures as low as 35. For the Freeze Warning tonight, sub-
  freezing temperatures as low as 28 expected.

* WHERE...San Diego County Valleys.

* WHEN...For the Freeze Warning this morning, until 9 AM PST this
  morning. For the Freeze Warning tonight, from 10 PM this 
  evening to 9 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ057-554-042200-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
Santa Ana Mountains and Foothills-Orange County Inland Areas-
Including the city of Mission Viejo
500 AM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...For inland Orange County, northeast winds 20 to 30 mph,
  with gusts to 50 mph. For the mountains and foothills, north to
  northeast winds 25 to 35 mph with gusts up to 65 mph.

* WHERE...Santa Ana Mountains and Foothills and Orange County 
  Inland Areas. Strongest on south and southwest facing slopes.

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Tree limbs could be blown down and a few power 
  outages may result. Difficult travel at times for high profile 
  vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ055-042200-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear Lake,
and Running Springs
500 AM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...North to northeast winds 25 to 35 mph with gusts up to 
  60 mph along the coastal slopes and 10 to 15 mph with gusts up 
  to 30 mph elsewhere. The wind, in combination with low 
  temperatures in the single digits, will result in wind chill 
  readings from 0 to 10 -degrees across most areas.

* WHERE...San Bernardino County Mountains.

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Tree limbs could be blown down and a few power 
  outages may result. Difficult travel at times for high profile 
  vehicles. Frostbite could occur on unprotected skin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

APR

For more information from the National Weather Service visit
http://weather.gov/sandiego
5 follow-up statements
252 
WWUS76 KSGX 042056
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
1256 PM PST Tue Feb 4 2020

CAZ048-050600-
/O.CON.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, and Corona
1256 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...
...FREEZE WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO
9 AM PST WEDNESDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 23 degrees expected. For the Wind Advisory, northeast winds
  15 to 25 mph with gusts to 45 mph.

* WHERE...San Bernardino and Riverside County Valleys-The Inland
  Empire. Coldest temperatures in southeastern Inland Empire.

* WHEN...For the Freeze Warning, from 10 PM this evening to 9 AM 
  PST Wednesday. For the Wind Advisory, until 9 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing. Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ060-050600-
/O.CON.KSGX.HZ.W.0002.200205T0200Z-200205T1800Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
1256 PM PST Tue Feb 4 2020

...HARD FREEZE WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING
TO 10 AM PST WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 17 degrees expected.

* WHERE...Apple and Lucerne Valleys. Coldest along and west of
  Highway 247. 

* WHEN...From 6 PM this evening to 10 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CAZ050-050600-
/O.CON.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, La Mesa,
Santee, and Poway
1256 PM PST Tue Feb 4 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO
9 AM PST WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 24 expected.

* WHERE...San Diego County Valleys. Coldest in the Ramona Valley,
  near the foothills, and near creeks and riverbeds.

* WHEN...From 10 PM this evening to 9 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ061-062-050600-
/O.CON.KSGX.FZ.W.0002.200205T0800Z-200205T1600Z/
Coachella Valley-San Diego County Deserts-
Including the cities of Indio, Coachella, and Borrego Springs
1256 PM PST Tue Feb 4 2020

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM
PST WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...San Diego County Deserts and Coachella Valley. Coldest
  south of Indio. 

* WHEN...From midnight tonight to 8 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ057-554-050600-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
Santa Ana Mountains and Foothills-Orange County Inland Areas-
Including the city of Mission Viejo
1256 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...Northeast winds 15 to 25 mph with gusts to 45 mph.
  Localized gusts to 55 mph possible in the canyons of the Santa
  Ana Mountains.

* WHERE...Santa Ana Mountains and Foothills and Orange County
  Inland Areas.

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ055-050600-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear Lake,
and Running Springs
1256 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...North winds 15 to 25 mph with gusts to 45 mph.

* WHERE...San Bernardino County Mountains. Strongest on southwest
  facing slopes downwind of ridgeline. 

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

Rodriguez

For more information from the National Weather Service visit
http://weather.gov/sandiego
470 
WWUS76 KSGX 050500
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
900 PM PST Tue Feb 4 2020

CAZ048-051300-
/O.CON.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, and Corona
900 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...
...FREEZE WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO
9 AM PST WEDNESDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 23 degrees expected. For the Wind Advisory, northeast 
  winds 15 to 25 mph with gusts to 45 mph.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire. Coldest temperatures in southeastern Inland Empire.

* WHEN...For the Freeze Warning, from 10 PM this evening to 9 AM 
  PST Wednesday. For the Wind Advisory, until 9 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing. Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ060-051300-
/O.CON.KSGX.HZ.W.0002.000000T0000Z-200205T1800Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
900 PM PST Tue Feb 4 2020

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM PST
WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 17 degrees expected.

* WHERE...Apple and Lucerne Valleys. Coldest along and west of 
  Highway 247.

* WHEN...From 6 PM this evening to 10 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CAZ050-051300-
/O.CON.KSGX.FZ.W.0002.200205T0600Z-200205T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, La Mesa,
Santee, and Poway
900 PM PST Tue Feb 4 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO
9 AM PST WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 24 expected.

* WHERE...San Diego County Valleys. Coldest in the Ramona 
  Valley, near the foothills, and near creeks and riverbeds.

* WHEN...From 10 PM this evening to 9 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ061-062-051300-
/O.CON.KSGX.FZ.W.0002.200205T0800Z-200205T1600Z/
Coachella Valley-San Diego County Deserts-
Including the cities of Indio, Coachella, and Borrego Springs
900 PM PST Tue Feb 4 2020

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM
PST WEDNESDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...San Diego County Deserts and Coachella Valley. Coldest 
  south of Indio.

* WHEN...From midnight tonight to 8 AM PST Wednesday.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ057-554-051300-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
Santa Ana Mountains and Foothills-Orange County Inland Areas-
Including the city of Mission Viejo
900 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...Northeast winds 15 to 25 mph with gusts to 45 mph. 

* WHERE...Santa Ana Mountains and Foothills and Orange County 
  Inland Areas.

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ055-051300-
/O.CON.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear Lake,
and Running Springs
900 PM PST Tue Feb 4 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST WEDNESDAY...

* WHAT...North winds 15 to 25 mph with gusts to 45 mph. Cold wind
  chills near zero overnight.

* WHERE...San Bernardino County Mountains. Strongest on 
  southwest facing slopes downwind of ridgeline.

* WHEN...Until 9 AM PST Wednesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/sandiego
960 
WWUS76 KSGX 051141
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
341 AM PST Wed Feb 5 2020

CAZ048-051700-
/O.CAN.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
/O.CON.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Ontario, Moreno Valley, Rancho Cucamonga,
and Corona-
341 AM PST Wed Feb 5 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...
...WIND ADVISORY IS CANCELLED...

* WHAT...Sub-freezing temperatures as low as 25.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ554-051600-
/O.CAN.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
/O.NEW.KSGX.FR.Y.0001.200205T1141Z-200205T1600Z/
Orange County Inland Areas-
341 AM PST Wed Feb 5 2020

...FROST ADVISORY IN EFFECT UNTIL 8 AM PST THIS MORNING...
...WIND ADVISORY IS CANCELLED...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Orange County Inland Areas.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

CAZ055-057-051245-
/O.CAN.KSGX.WI.Y.0004.000000T0000Z-200205T1700Z/
San Bernardino County Mountains-Santa Ana Mountains and Foothills-
341 AM PST Wed Feb 5 2020

...WIND ADVISORY IS CANCELLED...

Locally gusty north to northeast winds near the coastal slopes of
the mountains will diminish this afternoon.

$$

CAZ060-051800-
/O.CON.KSGX.HZ.W.0002.000000T0000Z-200205T1800Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
341 AM PST Wed Feb 5 2020

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...

* WHAT...Sub-freezing temperatures as low as 20.

* WHERE...Apple and Lucerne Valleys.

* WHEN...Until 10 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CAZ050-051700-
/O.CON.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, Santee, 
and Poway
341 AM PST Wed Feb 5 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 27.

* WHERE...San Diego County Valleys.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ061-062-051600-
/O.CON.KSGX.FZ.W.0002.000000T0000Z-200205T1600Z/
Coachella Valley-San Diego County Deserts-
Including the cities of Indio, Coachella, and Borrego Springs
341 AM PST Wed Feb 5 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 26.

* WHERE...San Diego County Deserts and Coachella Valley.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ043-051600-
/O.NEW.KSGX.FR.Y.0001.200205T1141Z-200205T1600Z/
San Diego County Coastal Areas-
Including the city of Vista
341 AM PST Wed Feb 5 2020

...FROST ADVISORY IN EFFECT UNTIL 8 AM PST THIS MORNING...

* WHAT...Temperatures as low as 31 will result in frost 
  formation.

* WHERE...San Diego County Coastal Areas.

* WHEN...Until 8 AM PST this morning.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/sandiego

17
625 
WWUS76 KSGX 051556
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
756 AM PST Wed Feb 5 2020

CAZ061-062-051700-
/O.EXP.KSGX.FZ.W.0002.000000T0000Z-200205T1600Z/
Coachella Valley-San Diego County Deserts-
Including the cities of Indio, Coachella, and Borrego Springs
756 AM PST Wed Feb 5 2020

...FREEZE WARNING WILL EXPIRE AT 8 AM PST THIS MORNING...

Temperatures in most areas are rising above freezing, and will
continue to rise through the morning. 

$$

CAZ554-051700-
/O.EXP.KSGX.FR.Y.0001.000000T0000Z-200205T1600Z/
Orange County Inland Areas-
756 AM PST Wed Feb 5 2020

...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING...

Temperatures in most areas are rising above freezing, and will
continue to rise through the morning. 

$$

CAZ043-051700-
/O.EXP.KSGX.FR.Y.0001.000000T0000Z-200205T1600Z/
San Diego County Coastal Areas-
Including the city of Vista
756 AM PST Wed Feb 5 2020

...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING...

Temperatures in most areas are rising above freezing, and will
continue to rise through the morning. 

$$

CAZ060-051800-
/O.CON.KSGX.HZ.W.0002.000000T0000Z-200205T1800Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
756 AM PST Wed Feb 5 2020

...HARD FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...

* WHAT...Sub-freezing temperatures as low as 20.

* WHERE...Apple and Lucerne Valleys.

* WHEN...Until 10 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

CAZ048-051700-
/O.CON.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Ontario, Moreno Valley, Rancho Cucamonga,
and Corona
756 AM PST Wed Feb 5 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 25.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

CAZ050-051700-
/O.CON.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, Santee, 
and Poway
756 AM PST Wed Feb 5 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 27.

* WHERE...San Diego County Valleys.

* WHEN...Until 9 AM PST this morning.

* IMPACTS...Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing

&&

$$

For more information from the National Weather Service visit
http://weather.gov/sandiego
006 
WWUS76 KSGX 051646
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
846 AM PST Wed Feb 5 2020

CAZ060-051800-
/O.CAN.KSGX.HZ.W.0002.000000T0000Z-200205T1800Z/
Apple and Lucerne Valleys-
846 AM PST Wed Feb 5 2020

...HARD FREEZE WARNING IS CANCELLED...

Temperatures in most areas are rising above freezing and will
continue to rise through the morning. 

$$

CAZ048-051800-
/O.EXP.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Ontario, Moreno Valley, Rancho Cucamonga,
and Corona
846 AM PST Wed Feb 5 2020

...FREEZE WARNING WILL EXPIRE AT 9 AM PST THIS MORNING...

Temperatures in most areas are rising above freezing and will
continue to rise through the morning.

$$

CAZ050-051800-
/O.EXP.KSGX.FZ.W.0002.000000T0000Z-200205T1700Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, Santee, 
and Poway
846 AM PST Wed Feb 5 2020

...FREEZE WARNING WILL EXPIRE AT 9 AM PST THIS MORNING...

Temperatures in most areas are rising above freezing and will
continue to rise through the morning.

$$

For more information from the National Weather Service visit
http://weather.gov/sandiego

What forecasters said that day

The local office's own words before this freeze warning 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 freeze warning went out at Feb 4, 4:18 AM PST, 42 minutes earlier.

Area forecast discussion, Feb 4, 4:18 AM PST, 42 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
418 AM PST Tue Feb 4 2020

.SYNOPSIS...
Offshore winds will continue to be gusty at times across northern
portions of our forecast area through much of today before
weakening tonight. This will bring chilly conditions, where
cold nighttime temperatures will yet again come into the picture
for many of our valley and desert locales. A warming trend is
expected Wednesday through Saturday with more dry weather. There
is a chance for some rain and mountain snow to make its way into
our area for Sunday and Monday.

&&

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

Winds were quite breezy early this morning, where we saw gusts
generally 30-40 mph below passes and canyons around the 3 AM
hour, though Freemont Canyon has reported 70 mph. These
northeastly winds will continue into the afternoon before slowly
weakening this evening. A deep trough over the western U.S. will
continue to provide cold northerly flow aloft as the system pushes
to the east. This will provide another another cool afternoon
with highs generally 5 to 15 degrees below average. As the winds
calm this evening, temperatures will plummet tonight for many
desert and inland valley locations. Freeze and Hard Freeze
Warnings have been issued, seeing that we are expecting these
areas to dip into the 20s and 30s.

High pressure off the West Coast will begin to progress its way
eastward, leading to warmer temperatures starting Wednesday, with
the warmest days on Friday and Saturday. Light onshore flow with
calm winds can be expected across the area through Saturday.

Latest ensemble guidance continuing to hint that this area of
high pressure will not be around for long as a potential trough
digs its way down into California on Sunday. Though confidence
still remains somewhat low on the details, we may see an
opportunity for some appreciable precipitation across the area
with another round of cooler than average temperatures. Long term
guidance trying to show this trough pattern lingering into the
area through the middle of next week.

&&

.AVIATION...
041000Z...Northeasterly surface gusts 25-45 kt across areas of the
mountains and below the passes/canyons today. Rotors, mountain waves
and LLWS are possible over/SW of the mountains. Strongest winds will
be in San Bernardino, Orange and Riverside Counties this morning,
with winds slowly diminishing thereafter. Mostly clear skies today
and tonight.

&&

.MARINE...
Gusty northeast winds will continue today, strongest between Camp
Pendleton and San Clemente Island. Gusts of 25 to 30 kts are
expected this morning. A Small Craft Advisory remains in effect
through noon. No additional hazardous marine weather is expected
this afternoon through Saturday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Freeze Warning until 10 AM PST Wednesday for Coachella Valley-
     San Bernardino and Riverside County Valleys-The Inland
     Empire-San Diego County Deserts-San Diego County Valleys.

     Wind Advisory until 9 AM PST Wednesday for Orange County Inland
     Areas-San Bernardino County Mountains-San Bernardino and
     Riverside County Valleys-The Inland Empire-Santa Ana
     Mountains and Foothills.

     Hard Freeze Warning until 10 AM PST Wednesday for Apple and
     Lucerne Valleys.

PZ...Small Craft Advisory until noon PST today 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...APR/17
AVIATION/MARINE...MM

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 4, 5:00 AM PSTHard Freeze WarningSGXSan Bernardino28 hr

Nearby

Freeze Warnings in California, 2020Every freeze warning 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.