Alert archive / California / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 1, NWS Los Angeles, CA

January 20, 2010San Luis Obispo County, Santa Barbara County, California

NWS Los Angeles, CA issued this severe thunderstorm warning at Jan 20, 2010, 5:37 AM PST for San Luis Obispo County, Santa Barbara County, California. It was in force for 83 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jan 20, 2010, 5:37 AM PST (13:37 UTC)
Expired
Jan 20, 2010, 7:00 AM PST
In force
83 min
Issued by
NWS Los Angeles, CA
Area
Storm-based polygon

Counties San Luis Obispo County, CA, Santa Barbara County, CA

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Los Angeles, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 20, 3:30 AM PST, 2 hours 7 minutes earlier.

Area forecast discussion, Jan 20, 3:30 AM PST, 2 hours 7 minutes before
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Hazardous weather outlook, Jan 20, 12:06 AM PST, 5 hours 31 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1206 AM PST WED JAN 20 2010

CAZ034>041-044>046-051>054-059-087-088-547-548-210806-
SAN LUIS OBISPO COUNTY CENTRAL COAST-
SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY-
SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST-
LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES-
VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
SANTA MONICA MOUNTAINS RECREATIONAL AREA-
SAN LUIS OBISPO COUNTY MOUNTAINS-
SANTA BARBARA COUNTY MOUNTAINS-VENTURA COUNTY MOUNTAINS-
LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE-
ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
LOS ANGELES COUNTY SAN GABRIEL VALLEY-
1206 AM PST WED JAN 20 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN CALIFORNIA.

.DAY ONE... TODAY

A POWERFUL PACIFIC STORM SYSTEM WILL MOVE THROUGH THE REGION TODAY
AND TONIGHT...BRINGING STRONG THUNDERSTORMS...HEAVY RAIN AND
SNOW...AND VERY GUSTY WINDS. GIVEN THE AMOUNT OF RAIN EXPECTED AND
THE ANTICIPATED RAINFALL RATES...MUD AND DEBRIS WILL BE POSSIBLE
IN AND AROUND RECENT BURN AREAS.

NEAR THE COAST AND ACROSS THE COASTAL WATERS...A LARGE WESTERLY
SWELL WILL COMBINE WITH LARGE WIND WAVES TO PRODUCE VERY DANGEROUS
SEAS. NEAR THE COAST...HIGH SURF CONDITIONS WILL CONTINUE WITH THE
POSSIBILITY OF COASTAL FLOODING. IF ANY THUNDERSTORM DEVELOP...
WATERSPOUTS WILL BE POSSIBLE OVER THE ENTIRE COASTAL WATERS.

* WINTER STORM WARNING.......SEE WWUS46 KLOX - WSWLOX FOR DETAILS *

* HIGH WIND WARNING..........SEE WWUS76 KLOX - NPWLOX FOR DETAILS *

* HIGH WIND WATCH............SEE WWUS76 KLOX - NPWLOX FOR DETAILS *

* FLOOD WATCH................SEE WGUS66 KLOX - FFALOX FOR DETAILS *

* WINTER WEATHER ADVISORY....SEE WWUS46 KLOX - WSWLOX FOR DETAILS *

* HIGH SURF ADVISORY.........SEE WHUS46 KLOX - CFWLOX FOR DETAILS *

* HIGH RIP CURRENT RISK......SEE FZUS56 KLOX - SRFLOX FOR DETAILS *

* MARINE WEATHER STATEMENT...SEE FZUS76 KLOX - MWSLOX FOR DETAILS *

* SPECIAL WEATHER STATEMENT..SEE WWUS86 KLOX - SPSLOX FOR DETAILS *

.DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY

A POWERFUL PACIFIC STORM SYSTEM WILL EXIT THE REGION ON THURSDAY.
NUMEROUS SHOWERS BEHIND THE SYSTEM WILL CONTINUE TO PRODUCE
ACCUMULATING SNOWFALL IN THE MOUNTAINS.

NEAR THE COAST AND ACROSS THE COASTAL WATERS...A LARGE WESTERLY
SWELL WILL CONTINUE THROUGH FRIDAY. NEAR THE COAST...HIGH SURF
CONDITIONS WILL CONTINUE.

* WINTER STORM WARNING.......SEE WWUS46 KLOX - WSWLOX FOR DETAILS *

* HIGH SURF ADVISORY.........SEE WHUS46 KLOX - CFWLOX FOR DETAILS *

* MARINE WEATHER STATEMENT...SEE FZUS76 KLOX - MWSLOX FOR DETAILS *

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

THOMPSON

In the hours before

Special weather statement, Jan 20, 12:23 AM PST, 5 hours 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
1223 AM PST WED JAN 20 2010

CAZ034>041-044>046-051>054-059-087-088-547-548-210300-
SAN LUIS OBISPO COUNTY CENTRAL COAST-
SANTA BARBARA COUNTY CENTRAL COAST-SANTA YNEZ VALLEY-
SAN LUIS OBISPO COUNTY INTERIOR VALLEYS-CUYAMA VALLEY-
SANTA BARBARA COUNTY SOUTH COAST-VENTURA COUNTY COAST-
LOS ANGELES COUNTY COAST INCLUDING DOWNTOWN LOS ANGELES-
VENTURA COUNTY INTERIOR VALLEYS-VENTURA COUNTY COASTAL VALLEYS-
SANTA MONICA MOUNTAINS RECREATIONAL AREA-
SAN LUIS OBISPO COUNTY MOUNTAINS-SANTA BARBARA COUNTY MOUNTAINS-
VENTURA COUNTY MOUNTAINS-
LOS ANGELES COUNTY MOUNTAINS EXCLUDING THE SANTA MONICA RANGE-
ANTELOPE VALLEY-CATALINA ISLAND-SANTA CLARITA VALLEY-
LOS ANGELES COUNTY SAN FERNANDO VALLEY-
LOS ANGELES COUNTY SAN GABRIEL VALLEY-
1223 AM PST WED JAN 20 2010

...VIGOROUS STORM SYSTEM TO AFFECT THE REGION TODAY AND TONIGHT
WITH THE POTENTIAL FOR STRONG THUNDERSTORMS...DAMAGING WINDS...HEAVY
RAINS AND MOUNTAIN SNOWS...COASTAL FLOODING...AND DANGEROUS SURF...

ANOTHER POWERFUL STORM SYSTEM WILL IMPACT THE AREA TODAY AND TONIGHT.
RAIN WILL SPREAD OVER THE AREA THIS MORNING AND BECOME HEAVY AT TIMES.
THE HEAVIEST RAIN WILL FALL ACROSS THE REGION BETWEEN 10 AM AND 8 PM.
PEAK RAINFALL RATES WILL RANGE FROM THREE-QUARTERS OF AN INCH TO
ONE INCH PER HOUR...WITH LOCAL RATES UP TO 1.50 INCHES PER HOUR ACROSS
SOUTH-FACING SLOPES AND NEAR THUNDERSTORMS. A FLASH FLOOD WATCH IS IN
EFFECT FOR THE 2008 AND 2009 BURN AREAS FOR THE POTENTIAL FOR
SIGNIFICANT FLASH FLOODING AND LIFE-THREATENING DEBRIS FLOWS.

TOTAL RAINFALL ACCUMULATIONS TODAY AND TONIGHT WILL RANGE FROM ONE TO
TWO INCHES OVER COASTAL AND VALLEY AREAS...WITH TWO TO FOUR INCHES IN
THE FOOTHILLS AND MOUNTAINS BELOW THE SNOW LEVEL WHICH WILL BE AROUND
5000 FEET. LOCAL RAINFALL TOTALS OVER FIVE INCHES ARE POSSIBLE ALONG
SOUTH FACING SLOPES.

THE COMBINATION OF STRONG ATMOSPHERIC DYNAMICS AND INSTABILITY WILL
BRING A HIGH POTENTIAL FOR STRONG THUNDERSTORMS TO DEVELOP TODAY AND
TONIGHT. SOME OF THE THUNDERSTORMS MAY PRODUCE HAIL...WIND
GUSTS IN EXCESS OF 60 MPH...AND TORRENTIAL DOWNPOURS. ATMOSPHERIC
CONDITIONS WILL ALSO BE FAVORABLE FOR ISOLATED WATERSPOUTS...WHICH
CAN ALWAYS COME ASHORE AS WEAK TORNADOES.

VERY STRONG AND DAMAGING WINDS WILL LIKELY BE WIDESPREAD ACROSS THE
AREA TODAY INTO THIS EVENING...WITH HIGH WIND WARNINGS POSTED FOR
MUCH OF SOUTHWEST CALIFORNIA. NUMEROUS DOWNED TREES AND POWER LINES
WILL BE POSSIBLE...ALONG WITH THE THREAT OF PROPERTY DAMAGE. EVEN
SOME COASTAL AND VALLEY AREAS NOT PRONE TO STRONG WINDS MAY BE
AFFECTED BY THESE STRONG AND DAMAGING WINDS. THERE IS THE POTENTIAL
FOR SOME OF THE STRONGEST WINDS ASSOCIATED WITH A FRONTAL SYSTEM IN
OVER A DECADE ACROSS MUCH OF SOUTHWEST CALIFORNIA.

IN THE MOUNTAIN AREAS...VERY STRONG WINDS GUSTING TO 80 MPH WILL
COMBINE WITH THE HEAVY SNOW TO PRODUCE NEAR BLIZZARD CONDITIONS AND
LOCAL WHITE OUT CONDITIONS...MAINLY ABOVE 5000 FEET. PERIODS OF
MODERATE TO HEAVY SNOW ARE EXPECTED TO CONTINUE THROUGH THURSDAY
NIGHT...WITH A WINTER STORM WARNING IN EFFECT FOR THE MOUNTAINS
OF LOS ANGELES AND VENTURA COUNTIES. DRIVING CONDITIONS IN THE
MOUNTAINS WILL BE VERY TREACHEROUS TODAY THROUGH THURSDAY...AND
TRAVEL IS HIGHLY DISCOURAGED.

VERY HIGH SURF WILL CONTINUE TO POUND SOUTHWEST AND WEST FACING BEACHES
AND HARBORS THROUGH FRIDAY. THE HIGH SURF COMBINED WITH THE VERY STRONG
SOUTHERLY WINDS TODAY WILL BRING AN INCREASED THREAT OF SIGNIFICANT
COASTAL FLOODING OF LOW LYING AREAS AS WELL AS POTENTIAL DAMAGE TO
LOCAL PIERS. COASTAL FLOOD WARNINGS AND HIGH SURF ADVISORIES
ARE IN EFFECT FOR BEACHES FROM SAN LUIS OBISPO TO LOS ANGELES COUNTIES.

RESIDENTS OF SOUTHWESTERN CALIFORNIA ARE URGED TO STAY TUNED FOR
THE LATEST INFORMATION ON THIS VIGOROUS AND POWERFUL WINTER STORM.
LISTEN TO NOAA WEATHER RADIO OR YOUR FAVORITE MEDIA SOURCE...OR
VISIT OUR WEBSITE AT WEATHER.GOV/LOSANGELES FOR THE LATEST UPDATES
OF FORECASTS AND WARNINGS.

HALL/GOMBERG/DB
Special weather statement, Jan 20, 3:41 AM PST, 1 hour 56 minutes before
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Special weather statement, Jan 20, 4:57 AM PST, 40 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jan 19, 8:00 PM PSTGale WatchLOX6 hr
Jan 19, 8:00 PM PSTSmall Craft AdvisoryLOX17 hr
Jan 19, 8:59 PM PSTHigh Wind WarningLOXLos Angeles, Santa Barbara23 hr
Jan 19, 10:12 PM PSTCoastal Flood WarningLOXLos Angeles68 hr
Jan 19, 10:41 PM PSTWinter Storm WarningLOX71 hr
Jan 19, 11:45 PM PSTSpecial Marine WarningLOX47 min
Jan 20, 2:18 AM PSTGale WarningLOX11 hr
Jan 20, 2:18 AM PSTSmall Craft AdvisoryLOX31 hr
Jan 20, 2:18 AM PSTStorm WarningLOX11 hr
Jan 20, 3:41 AM PSTSpecial Weather StatementLOXLos Angeles49 min
Jan 20, 5:34 AM PSTSpecial Marine WarningLOX41 min
Jan 20, 5:58 AM PSTAreal Flood AdvisoryLOXSan Luis Obispo, Santa Barbara9 hr
Jan 20, 6:39 AM PSTSpecial Marine WarningLOX36 min
Jan 20, 9:34 AM PSTAreal Flood AdvisoryLOXLos Angeles, Ventura9 hr
Jan 20, 10:17 AM PSTSpecial Marine WarningLOX43 min
Jan 20, 10:58 AM PSTSpecial Marine WarningLOX47 min
Jan 20, 11:51 AM PSTSpecial Marine WarningLOX39 min
Jan 20, 1:21 PM PSTGale WarningLOX99 min
Jan 20, 2:19 PM PSTSpecial Marine WarningLOX26 min
Jan 20, 2:30 PM PSTWind AdvisoryLOXLos Angeles6 hr
Jan 20, 2:45 PM PSTSpecial Weather StatementLOXLos Angeles30 min
Jan 20, 3:00 PM PSTGale WatchLOX6 hr
Jan 20, 3:42 PM PSTFlash Flood WarningLOXLos Angeles3 hr

Nearby

Severe Thunderstorm Warnings in California, 2010Every severe thunderstorm warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.