Alert archive / California / Flash Flood Warnings in 1991
Flash Flood Warning 2, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Sep 5, 1991, 6:00 PM PDT for Imperial County, San Diego County, California. It was in force for .
The area
The counties it named.
The facts
- Issued
- Sep 5, 1991, 6:00 PM PDT (01:00 UTC)
- Expired
- Sep 5, 1991, 6:00 PM PDT
- In force
- Issued by
- NWS San Diego, CA
- Area
- Whole counties
Counties Imperial County, CA, San Diego County, CA
The nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 1.0 hours before the alert went out and 109 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1401 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAACA KSAN 060057 FFWSAN CAC025-073-060100- BULLETIN - EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN DIEGO CA 600 PM PDT THU SEP 5 1991 THE NATIONAL WEATHER SERVICE IN SAN DIEGO IS EXTENDING SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 700 PM PDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST CALIFORNIA ...NORTHWESTERN IMPERIAL COUNTY IN SOUTHWEST CALIFORNIA ...NORTHEASTERN SAN DIEGO COUNTY RADAR AND SATELLITE SHOW THUNDERSTORMS WITH HEAVY RAINS ARE CONTINUING OVER MOUNT PALOMAR...WARNER SPRINGS...BORREGO SPRING AND MOUNT LAGUNA. PEOPLE IN THESE AREAS ARE ADVISED THAT THE RAINS ARE PRODUCING MUD SLIDES THAT HAVE PROMPTED THE CALIFORNIA HIGHWAY PATROL TO CLOSE SECTIONS OF HIGHWAY 79 AND 76. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. CEGIEL
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, Sep 5, 12:25 PM PDT, 5 hours 35 minutes before
CAZ-ALL-060100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN DIEGO CA 1230 PM PDT THU SEP 05 1991 NOON SATELLITE PICTURES SHOW THE MOST ACTIVE AREA OF DEVELOPING THUNDERSTORMS ARE OVER NORTHERN SAN DIEGO COUNTY FROM OCEANSIDE TO MT PALOMAR IN SAN DIEGO COUNTY. RADAR INDICATES LIGHT RAINFALL. WEATHER CONDITIONS...HOWEVER...POINT TO A RESURGENCE OF THUNDERSTORM ACTIVITY TODAY AND THIS EVENING. A LOW PRESSURE LOCATED JUST OFF THE SAN DIEGO COAST COMBINING WITH A VERY WARM AND MOIST FLOW FROM MEXICO ARE RESPONSIBLE FOR VERY UNSTABLE CONDITIONS OVER SAN DIEGO COUNTY AND SOUTHERN CALIFORNIA. THUNDERSTORMS WILL INCREASE THIS AFTERNOON AS THE HEATING OF THE DAY CONTRIBUTES FURTHER TO THE INSTABILITY. SOME OF THESE DEVELOPING THUNDERSTORMS HAVE THE POTENTIAL OF PRODUCING LOCALLY HEAVY RAINS...GUSTY WINDS AND EVEN HAIL. CAUTION SHOULD BE EXERCISED IF THESE CONDITIONS DEVELOP ANYWHERE IN SAN DIEGO AND IMPERIAL COUNTIES INCLUDING THE REST OF SOUTHERN CALIFORNIA. . THUNDERSTORMS WILL GRADUALLY DIMINISH AND BE CONFINED TO THE MOUNTAINS AND DESERTS FRIDAY AS THE LOW PRESSURE SLOWLY MOVES EAST OF SAN DIEGO. FURTHER DRYING WILL DEVELOP THIS WEEKEND AS HIGH LEVEL WINDS BECOME MORE SOUTHWESTERLY AND DRIER. SHIGEHARA
Nearby
Flash Flood Warnings in California, 1991Every flash flood warning in 1991
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.