Alert archive / California / Flash Flood Warnings in 1990
Flash Flood Warning 5, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Aug 11, 1990, 7:33 PM PDT for Imperial County, California. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- Aug 11, 1990, 7:33 PM PDT (02:33 UTC)
- Expired
- Aug 11, 1990, 9:30 PM PDT
- In force
- 117 min
- Issued by
- NWS San Diego, CA
- Area
- Whole counties
County Imperial County, CA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 2.6 hours before the alert went out and 173 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
- 269 J/kg
- Mixed-layer CIN
- -535 J/kg
- Mixed-layer LCL
- 1941 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 11, 2:14 PM PDT, 5 hours 19 minutes before
CAZ013-092100 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 2:00 PM PDT SAT AUG 11 1990 SAN DIEGO RADAR INDICATES A STRONG THUNDERSTORM DEVELOPED BETWEEN HEMET AND LAKE HENSHAW AND HAS REMAINED STATIONARY FOR THE PAST HOUR. THE STORM CONTINUES TO DEVELOP WITH AFTERNOON HEATING. IF CONDITIONS PERSIST LOCAL FLOODING IS POSSIBLE AND PERSONS IN THAT AREA SHOULD TAKE PRECAUTION AND TAKE THE HIGH GROUND IF IT BECOMES NECESSARY. SHIGEHARA
Special weather statement, Aug 11, 3:00 PM PDT, 4 hours 33 minutes before
CAZ013-092158 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 2:58 PM PDT SAT AUG 11 1990 SAN DIEGO RADAR INDICATES AN INTENSIFYING AREA OF THUNDERSTORM IN THE TRIANGLE OF HEMET...LAKE HENSHAW AND FALLBROOK. STRONG THUNDERSTORMS IN THIS AREA APPEAR STATIONARY AND COULD BE PRODUCING LOCAL FLOODING. PERSONS IN THIS ARE ADVISED TO TAKE PRECAUTION AND TAKE THE HIGH GROUND IF FLOODING IS OBSERVED OR IF YOU ARE HEADING FOR THIS AREA YO(UR TRIP SHOULD BE TEMPORARILY POSTPONED. CAMPERS AND PEOPLE TRAVELING THROUGH THE AREA AROUND RAINBOW AND RANCHO CALIFORNIA WILL BE NEAR THE AREA OF HEAVY RAINS AND DRIVING COULD BE HAZARDOUS. SHIGEHARA
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:33 PM PDT | Severe Thunderstorm Warning | SGX | Imperial | 117 min |
| Aug 11, 8:15 PM PDT | Severe Thunderstorm Warning | SGX | Imperial | 75 min |
| Aug 12, 2:58 PM PDT | Flash Flood Warning | SGX | San Diego | 62 min |
Nearby
Flash Flood Warnings in California, 1990Every flash flood warning in 1990
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.