Alert archive / California / Flash Flood Warnings in 1986

Flash Flood Warning 4, NWS Los Angeles, CA

August 9, 1986Riverside County, California

NWS Los Angeles, CA issued this flash flood warning at Aug 9, 1986, 3:52 PM PDT for Riverside County, California. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 9, 1986, 3:52 PM PDT (22:52 UTC)
Expired
Aug 9, 1986, 6:00 PM PDT
In force
2 hr
Issued by
NWS Los Angeles, CA
Area
Whole counties

County Riverside 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 12:00Z, 10.9 hours before the alert went out and 154 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 1986-08-09Temperature 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 1986-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.1939Sfc1 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
3622 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 9, 1:03 PM PDT, 2 hours 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOS ANGELES CA
100 PM PDT SAT AUG 9 1986

...WIDELY SCATTERED THUNDERSTORMS DEVELOP MOUNTAINS AND DESERTS...

RADAR DETECTS WIDELY SCATTERED THUNDERSTORMS DEVELOPING IN THE
MOUNTAINS AND DESERTS OF SOUTHERN CALIFORNIA THIS SATURDAY AFTERNOON.

AT 1245 PM...THUNDERSTORMS WERE DETECTED TO THE WEST OF TWENTY NINE
PALMS...TO THE NORTHWEST OF BIG BEAR LAKE AND IN THE SANTA ROSA
MOUNTAINS TO THE WEST OF THE SALTON SEA.

RADAR TOPS NEAR TWENTY NINE PALMS EXCEED FOURTY THOUSAND FEET...AND
MOTORISTS ALONG STATE HIGHWAY 62 BETWEEN TWENTY NINE PALMS AND YUCCA
VALLEY SHOULD BE ALERT FOR STRONG GUSTY WINDS AND POSSIBLE HAIL FOR
THE NEXT ONE TO TWO HOURS.

ALSO...THE THUNDERSTORMS NEAR BIG BEAR LAKE HAVE BEEN PERSISTENT FOR
THE LAST HOUR.  LOCAL HEAVY RAIN IS POSSIBLE.
MOIST TROPICAL AIR CONTINUES TO MOVE INTO THE MOUNTAINS AND DESERTS
OF SOUTHERN CALIFORNIA...AND THUNDERSTORMS ARE EXPECTED TO PERSIST
IN THE AFTERNOON AND EVENING HOURS THE REMAINDER OF THIS WEEKEND.

BOB GREBE
Special weather statement, Aug 9, 2:52 PM PDT, 1 hour before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOS ANGELES CA
100 PM PDT SAT AUG 9 1986

       ...MOUNTAIN AND DESERT THUNDERSTORMS CONTINUE...

RADAR DETECTS SCATTERED THUNDERSTORMS IN THE MOUNTAINS AND DESERTS
OF SOUTHERN CALIFORNIA.

AT 245 PM...THUNDERSTORMS WERE DETECTED NEAR TWENTY NINE PALMS AND
NEAR BIG BEAR LAKE...AS WELL AS...THE SANTA ROSA MOUNTAINS.

RADAR TOPS NEAR TWENTY NINE PALMS EXCEED FOURTY THOUSAND FEET...AND
MOTORISTS ALONG STATE HIGHWAY 62 BETWEEN TWENTY NINE PALMS AND YUCCA
VALLEY SHOULD BE ALERT FOR STRONG GUSTY WINDS AND POSSIBLE HAIL FOR
THE NEXT SEVERAL HOURS.

ALSO...THE THUNDERSTORMS NEAR BIG BEAR LAKE HAVE BEEN PERSISTENT FOR
SEVERAL HOURS.  LOCAL HEAVY RAIN IS POSSIBLE.
                                    .
MOIST TROPICAL AIR CONTINUES TO MOVE INTO THE MOUNTAINS AND DESERTS
OF SOUTHERN CALIFORNIA...AND THUNDERSTORMS ARE EXPECTED TO PERSIST
IN THE AFTERNOON AND EVENING HOURS THE REMAINDER OF THIS WEEKEND.

BOB GREBE

The office that day

Everything else NWS Los Angeles, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 3:52 PM PDTFlash Flood WarningLOXSan Bernardino2 hr

Nearby

Flash Flood Warnings in California, 1986Every flash flood warning in 1986

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.