Alert archive / California / Flash Flood Warnings in 2001

Flash Flood Warning 8, NWS San Diego, CA

July 7, 2001San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Jul 7, 2001, 12:50 PM PDT for San Bernardino County, California. It was in force for 2 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
Jul 7, 2001, 12:50 PM PDT (19:50 UTC)
Expired
Jul 7, 2001, 3:00 PM PDT
In force
2 hr
Issued by
NWS San Diego, CA
Area
Whole counties

County San Bernardino County, CA

The nearest sounding before it

Mercury/Desert R, NV (KDRA), launched 12:00Z, 7.8 hours before the alert went out and 198 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, Mercury/Desert R, NV at 12:00Z on 2001-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 139 joules per kilogram.LCLLFCEL10008507005003002001001 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, Mercury/Desert R, NV at 12:00Z on 2001-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 square meters per square second.193958Sfc1 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
139 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
950 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KSGX 071957
FFWSAN

CAC071-072200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
1250 PM PDT SAT JUL 7 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA FOR THE 
  MOUNTAINS AND HIGH DESERT.

* UNTIL 300 PM PDT

* AT 1245 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY   
ALONG AND NEAR THE RIDGE LINE OF THE SAN BERNARDINO MOUNTAINS AND INTO 
THE APPLE VALLEY NEAR WRIGHTWOOD...BIG BEAR LAKE AND HESPERIA.

* THE THUNDERSTORMS WERE NEARLY STATIONARY. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY 
AUTOMOBILE. IF YOUR VEHICLE STALLS...ABANDON IT IMMEDIATELY AND SEEK 
HIGHER GROUND.

AREAS NEAR WRIGHTWOOD...BIG BEAR LAKE AND HESPERIA WILL HAVE HEAVY RAIN 
WITH FLOODING THROUGH 300 PM. 

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

$$

LAT...LON 3455 11760 3434 11761 3410 11652 3433 11661

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 5:00 PM PDTFlash Flood WarningSGXSan Diego60 min
Jul 6, 5:00 PM PDTFlash Flood WarningSGXSan Diego30 min
Jul 7, 11:45 AM PDTFlash Flood WarningSGXSan Bernardino75 min
Jul 7, 2:25 PM PDTFlash Flood WarningSGXRiverside65 min
Jul 7, 2:53 PM PDTFlash Flood WarningSGXRiverside, San Bernardino2 hr

Nearby

Flash Flood Warnings in California, 2001Every flash flood warning in 2001

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.