Alert archive / California / Tornado Warnings in 1991

Tornado Warning 2, NWS Los Angeles, CA

March 20, 1991San Bernardino County, California

NWS Los Angeles, CA issued this tornado warning at Mar 20, 1991, 2:09 PM PST for San Bernardino County, California. It was in force for 51 min.

The area

The counties it named.

The facts

Issued
Mar 20, 1991, 2:09 PM PST (22:09 UTC)
Expired
Mar 20, 1991, 3:00 PM PST
In force
51 min
Issued by
NWS Los Angeles, CA
Area
Whole counties

County San Bernardino County, CA

The nearest sounding before it

Edwards AFB, CA (KEDW), launched 12:00Z, 10.2 hours before the alert went out and 148 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, Edwards AFB, CA at 12:00Z on 1991-03-20Temperature 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, Edwards AFB, CA at 12:00Z on 1991-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 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
1105 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLAX 202205
TORLAX
CAC071-202300-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LOS ANGELES CA
209 PM PST WED MAR 20 1991
 
THE NATIONAL WEATHER SERVICE IN LOS ANGELES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  300 PM PST
FOR PEOPLE IN THE FOLLOWING LOCATION......
 
IN SOUTHERN CALIFORNIA
 
   ...SOUTHWESTERN SAN BERNARDINO COUNTY
 
A TORNADO HAS BEEN REPORTED IN THE MUSCOY AREA OF SAN BERNARDINO
AT 145 PM. NO INFORMATION ON THE MOVEMENT WAS GIVEN...BUT THE
TORNADO IS EXPECTED TO BE SHORT LIVED. IN ADDITION...A LARGE FUNNEL
CLOUD HAS BEEN REPORTED IN THE DEVORE AREA WITHIN THE PAST HOUR.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

What forecasters said that day

The local office's own words before this tornado 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, Mar 20, 9:03 AM PST, 5 hours 6 minutes before
CAZALL-202100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOS ANGELES CA
9 AM PST TUE MAR 20 1991

...WINTER STORM WARNING FOR THE SOUTHERN CALIFORNIA MOUNTAIN AREAS
   THROUGH THIS AFTERNOON...
...SNOW ADVISORY FOR THE HIGHER ELEVATIONS OF THE MOJAVE DESERT...
...STRONG THUNDERSTORMS POSSIBLE OVER THE COASTAL AND VALLEY AREAS...

A STRONG COLD FRONT IS MOVING THROUGH SOUTHERN CALIFORNIA THIS
MORNING...AND AN UNSTABLE AIRMASS WILL FOLLOW THIS AFTERNOON AND
EVENING. THE SNOW LEVEL HAS LOWERED TO 3000 FEET...AND A WINTER
STORM WARNING CONTINUES IN EFFECT FOR THE MOUNTAINS WHERE 8 TO 14
INCHES OF SNOW IS POSSIBLE THROUGH THIS EVENING. IN ADDITION...SNOW
HAS BEEN REPORTED IN THE MOJAVE AREA THIS MORNING...AND A SNOW ADVISORY
HAS BEEN ISSUED FOR AREAS ABOVE 3000 FEET IN THE MOJAVE DESERT THROUGH
THIS EVENING WHERE...2 TO 4 INCHES OF SNOW IS POSSIBLE.

PEOPLE PLANNING TRAVEL INTO THE MOUNTAINS AND HIGHER DESERT AREAS
TODAY SHOULD PREPARE FOR WINTER DRIVING CONDITIONS...CARRY CHAINS
AND WARM CLOTHING. CHECK ROAD CONDITIONS BEFORE LEAVING AS MANY
ROADS REQUIRE CHAINS...OR ARE CLOSED.

THE AIRMASS WILL BE VERY UNSTABLE TODAY...AND THIS WILL RESULT
IN STRONG THUNDERSTORMS IN THE COASTAL AND VALLEY AREAS. THESE
STORMS MAY PROUDCE SMALL HAIL...FREQUENT LIGHTNING...AND WINDS
GUSTING TO 50 MPH OR MORE. IF YOU ARE OUTSIDE AND A THUNDERSTORM
APPROACHES...SEEK SHELTER INDOORS.

THE AIRMASS WILL CONTINUE UNSTABLE THROUGH THURSDAY...WITH SCATTERED
SHOWERS AND A FEW THUNDERSTORMS CONTINUING.

THE NEXT STATEMENT WILL BE ISSUED 130 PM.

PETERSON
Special weather statement, Mar 20, 10:39 AM PST, 3 hours 30 minutes before
CAZ003-004-210000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SANTA MARIA CA
1035 AM PST WED MAR 20 1991

...POSSIBLE THUNDERSTORMS WITH GUSTY WINDS AND SMALL HAIL ON THE
CENTRAL CALIFORNIA COAST THIS AFTERNOON...

THE CORE OF A VERY COLD LOW PRESSURE SYSTEM WILL BE MOVING OVER THE
CENTRAL CALIFORNIA COAST...INCLUDING SANTA BARBARA...DURING THE NEXT
6 HOURS. IT WILL BE ACCOMPANIED BY AN AREA OF SCATTERED SHOWERS AND
THUNDERSTORMS...SOME OF WHICH MAY CONTAIN BRIEF HEAVY RAINFALL...
GUSTY WINDS UP TO 45 MILES AN HOUR...AND SMALL HAIL.

AT 1030 AM PST...SATELLITE IMAGERY SHOWED SCATTERED SHOWERS AND
POSSIBLE THUNDERSTORMS JUST OFFSHORE. THEY WERE MOVING TO THE EAST
AT 25 MILES AN HOUR.

ALL PERSONS IN SAN LUIS OBISPO COUNTY AND SANTA BARBARA COUNTY
SHOULD STAY ABREAST OF THE LATEST WEATHER CONDITIONS. BE PREPARED
FOR POSSIBLE GUSTY WINDS...HEAVY RAIN...AND SMALL HAIL. IF OUTSIDE
AND THREATENING WEATHER APPROACHES...SEEK SOME xSORT OF SHELTER
IMMEDIATELY.

ALL SMALL CRAFT ALONG THE IMMEDIATE CENTRAL COAST ARE ADVISED TO
SEEK SAFE HARBOR FOR THE REST OF TODAY.

TRM
Special weather statement, Mar 20, 1:34 PM PST, 35 minutes before
CAZ003-004-210100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SANTA MARIA CA
130 PM PST WED MAR 20 1991

...FLASH FLOOD WATCH CONTINUES TODAY UNTIL 6 PM FOR SAN LUIS OBISPO
AND NORTHERN SANTA BARBARA COUNTY...
...URBAN AND SMALL STREAM ADVISORY FOR SAN LUIS OBISPO AND SANTA
BARBARA COUNTY UNTIL 4 PM...
...THUNDERSTORMS WITH HAIL OVER SAN LUIS OBISOP AND SANTA BARBARA
COUNTY...

A VERY COLD LOW PRESSURE SYSTEM IS MOVING OVER THE CENTRAL CALIFORNIA
COAST THIS AFTERNOON. AT 115 PM SPOTTERS IN THE CITY OF SANTA BARBARA
HAVE REPORTED HAIL FROM 1/4 TO 1/2 INCH IN DIAMETER.

SCATTERED THUNDERSTORMS HAVE BEEN REPORTED WITH WIDE-SPREAD PEA SIZE
HAIL IN BOTH SAN LUIS OBISPO AND SANTA BARBARA COUNTIES. SOME SNOW
HAS ALSO FALLEN OVER THE HILLS JUST EAST OF EDNA VALLEY SOUTH OF
SAN LUIS OBISPO.

OVER THE NEXT 6 HOURS...SCATTERED SHOWERS AND THUNDERSTORMS...SOME OF
WHICH MAY CONTAIN BRIEF HEAVY RAINFALL... GUSTY WINDS UP TO 45 MILES
AN HOUR...AND SMALL HAIL IS EXPECTED OVER BOTH SAN LUIS OBISPO AND
SANTA BARBARA COUNTIES.

AT 130 PM PST...SATELLITE IMAGERY SHOWED MORE SCATTERED SHOWERS AND
POSSIBLE THUNDERSTORMS OFFSHORE OF THE CENTRAL COAST. THEY WERE
MOVING TO THE EAST AT 25 MILES AN HOUR.

ALL PERSONS IN SAN LUIS OBISPO COUNTY AND SANTA BARBARA COUNTY
SHOULD STAY ABREAST OF THE LATEST WEATHER CONDITIONS. BE PREPARED
FOR POSSIBLE GUSTY WINDS...HEAVY RAIN...AND SMALL HAIL.

IN ADDITION...MOTORISTS SHOULD DRIVE WITH EXTRA CAUTION IN AREAS OF
FLOODING ON STREETS AND HIGHWAYS. DO NOT ATTEMPT TO CROSS FLOODED
HIGHWAYS. IF OUTSIDE AND THREATENING WEATHER APPROACHES...SEEK SOME
SORT OF SHELTER IMMEDIATELY.

FELSCH
Special weather statement, Mar 20, 1:36 PM PST, 33 minutes before
CAZ003-004-011-015-210100-

SPECIAL WEATHER STATEMENT ...CORRECTION FOR CODE...
NATIONAL WEATHER SERVICE SANTA MARIA CA
130 PM PST WED MAR 20 1991

...FLASH FLOOD WATCH CONTINUES TODAY UNTIL 6 PM FOR SAN LUIS OBISPO
AND NORTHERN SANTA BARBARA COUNTY...
...URBAN AND SMALL STREAM ADVISORY FOR SAN LUIS OBISPO AND SANTA
BARBARA COUNTY UNTIL 4 PM...
...THUNDERSTORMS WITH HAIL OVER SAN LUIS OBISOP AND SANTA BARBARA
COUNTY...

A VERY COLD LOW PRESSURE SYSTEM IS MOVING OVER THE CENTRAL CALIFORNIA
COAST THIS AFTERNOON. AT 115 PM SPOTTERS IN THE CITY OF SANTA BARBARA
HAVE REPORTED HAIL FROM 1/4 TO 1/2 INCH IN DIAMETER.

SCATTERED THUNDERSTORMS HAVE BEEN REPORTED WITH WIDE-SPREAD PEA SIZE
HAIL IN BOTH SAN LUIS OBISPO AND SANTA BARBARA COUNTIES. SOME SNOW
HAS ALSO FALLEN OVER THE HILLS JUST EAST OF EDNA VALLEY SOUTH OF
SAN LUIS OBISPO.

OVER THE NEXT 6 HOURS...SCATTERED SHOWERS AND THUNDERSTORMS...SOME OF
WHICH MAY CONTAIN BRIEF HEAVY RAINFALL... GUSTY WINDS UP TO 45 MILES
AN HOUR...AND SMALL HAIL IS EXPECTED OVER BOTH SAN LUIS OBISPO AND
SANTA BARBARA COUNTIES.

AT 130 PM PST...SATELLITE IMAGERY SHOWED MORE SCATTERED SHOWERS AND
POSSIBLE THUNDERSTORMS OFFSHORE OF THE CENTRAL COAST. THEY WERE
MOVING TO THE EAST AT 25 MILES AN HOUR.

ALL PERSONS IN SAN LUIS OBISPO COUNTY AND SANTA BARBARA COUNTY
SHOULD STAY ABREAST OF THE LATEST WEATHER CONDITIONS. BE PREPARED
FOR POSSIBLE GUSTY WINDS...HEAVY RAIN...AND SMALL HAIL.

IN ADDITION...MOTORISTS SHOULD DRIVE WITH EXTRA CAUTION IN AREAS OF
FLOODING ON STREETS AND HIGHWAYS. DO NOT ATTEMPT TO CROSS FLOODED
HIGHWAYS. IF OUTSIDE AND THREATENING WEATHER APPROACHES...SEEK SOME
SORT OF SHELTER IMMEDIATELY.

FELSCH

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 19, 11:05 PM PSTFlash Flood WarningLOXSan Luis Obispo, Santa Barbara3 hr
Mar 20, 12:58 AM PSTFlash Flood WarningLOXSan Luis Obispo, Santa Barbara2 hr
Mar 20, 11:30 AM PSTTornado WarningLOXRiverside60 min

Nearby

Tornado Warnings in California, 1991Every tornado warning in 1991Tornadoes 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.