Severe Thunderstorm Warning 9, NWS Hanford, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
315 PM PDT THU MAY 28 2009

.DISCUSSION...SCATTERED SHOWERS OCCURRED OVER THE MOUNTAINS AND A
FEW THUNDERSTORMS NEAR SAN JOAQUIN RIDGE AND YOSEMITE. OTHERWISE
MOSTLY SUNNY IN THE VALLEY WITH TEMPERATURES IN THE MID TO UPPER
90S. A WEAK UPPER LEVEL IMPULSE OVER THE COAST WILL MOVE NEAR THE
CHANNEL ISLANDS FRIDAY. 500MB HEIGHTS START LOWERING OVERNIGHT.
THE LOWER HEIGHT SHOULD ALSO ALLOW FOR A DEEPER MARINE LAYER ALONG
THE COAST. SO THINK TEMPERATURES WILL BE A BIT COOLER OVERNIGHT
AND FRIDAY. THERE MAY BE A REPEAT OF TODAYS CONVECTIVE STORM
ACTIVITY FRIDAY WITH MOIST AND UNSTABLE AIRMASS OVER THE REGION
AND SE MID LEVEL FLOW. THE CONVECTIVE POTENTIAL MAY SHIFT TOWARDS
THE TULARE MOUNTAINS OF KERN COUNTY MOUNTAINS AND DESERT SATURDAY
AS THE WEAK DISTURBANCE REACHES SOUTH CALIFORNIA. LIGHT MID LEVEL
WIND FLOW MAY KEEP THE CONVECTIVE STORM THREAT MAINLY OVER THE
HIGHER ELEVATIONS OF THE SIERRA SUNDAY. A COOLER ONSHORE SW FLOW
WILL BRING MUCH COOLER TEMPERATURES INTO CENTRAL CALIFORNIA MONDAY
AS A DEEPER UPPER LOW APPROACHES 130W OFF THE WEST COAST. THE 00Z
MODELS HAVE DIVERGE ON THE TIMING WITH THE SYSTEM. THE ECM NOW
MAINTAINS THE LOW OFF THE COAST ALONG 130W WITH THE GFS MORE
PROGRESSIVE AND BRINGS THE SYSTEM NEAR THE CENTRAL COAST WEDNESDAY.
WATER VAPOR IMAGES INDICATE THE EPAC SYSTEM ALREADY BECOMING
CLOSED OFF. A CLOSED UPPER SLOW COULD DRIFT OFF THE COAST FOR
DAYS. SO HAVE OPTED TO MAINTAIN THE CURRENT DRY FORECAST.

&&

.AVIATION...ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP OVER
THE MOUNTAINS AND DESERT AFTER 19Z TODAY AND DISSIPATE BY 06Z
FRIDAY. A FEW THUNDERSTORMS WILL ALSO DRIFT INTO THE SIERRA
FOOTHILLS EARLY THIS EVENING. OTHERWISE...VFR CONDITIONS WILL
PREVAIL ACROSS THE CENTRAL CALIFORNIA INTERIOR THROUGH 12Z FRIDAY.

&&

.AIR QUALITY ISSUES...
ON THURSDAY MAY 28 2009... UNHEALTHY IN KERN COUNTY. UNHEALTHY FOR
SENSITIVE GROUPS IN FRESNO... KINGS... MADERA... MERCED AND TULARE
COUNTIES.
FURTHER INFORMATION IS AVAILABLE AT VALLEYAIR.ORG

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

PUBLIC...MV
AVN/FW...DCH

WEATHER.GOV/HANFORD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
1019 AM PDT THU MAY 28 2009

CAZ089-091-092-291730-
WEST CENTRAL SAN JOAQUIN VALLEY-SOUTHWESTERN SAN JOAQUIN VALLEY-
SOUTHEASTERN SAN JOAQUIN VALLEY-
1019 AM PDT THU MAY 28 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WEST CENTRAL AND
SOUTHERN SAN JOAQUIN VALLEY.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED THIS AFTERNOON THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS HAVE BEEN ACTIVATED ACROSS THE WEST CENTRAL AND
SOUTHERN SAN JOAQUIN VALLEY FROM 1 - 7 PM.

WEATHER SPOTTERS ARE ENCOURAGED TO RELAY ANY REPORTS OF SEVERE
WEATHER TO THE NATIONAL WEATHER SERVICE THROUGH THE AMATEUR RADIO
NETWORK OR BY TELEPHONE.

WEATHER.GOV/HANFORD

CAZ095>097-291730-
KERN COUNTY MOUNTAINS-SIERRA NEVADA FROM YOSEMITE TO KINGS CANYON-
TULARE COUNTY MOUNTAINS-
1019 AM PDT THU MAY 28 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE KERN COUNTY MOUNTAINS
AND THE HIGHER ELEVATIONS OF THE SOUTHERN SIERRA NEVADA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE IN THE SIERRAS...THE KERN AND TULARE COUNTY
MOUNTAINS. HAIL, STRONG WINDS AND HEAVY RAIN ARE POSSIBLE AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTERS HAVE BEEN ACTIVATED ACROSS THE KERN COUNTY
MOUNTAINS AND THE HIGHER ELEVATIONS OF THE SOUTHERN SIERRA NEVADA
FROM 1 PM - 7 PM.

WEATHER SPOTTERS ARE ENCOURAGED TO RELAY ANY REPORTS OF SEVERE
WEATHER TO THE NATIONAL WEATHER SERVICE THROUGH THE AMATEUR RADIO
NETWORK OR BY TELEPHONE.

WEATHER.GOV/HANFORD

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
600 PM PDT THU MAY 28 2009

CAZ089>097-290430-
WEST CENTRAL SAN JOAQUIN VALLEY-EAST CENTRAL SAN JOAQUIN VALLEY-
SOUTHWESTERN SAN JOAQUIN VALLEY-SOUTHEASTERN SAN JOAQUIN VALLEY-
MARIPOSA MADERA AND FRESNO COUNTY FOOTHILLS-
TULARE COUNTY FOOTHILLS-KERN COUNTY MOUNTAINS-
SIERRA NEVADA FROM YOSEMITE TO KINGS CANYON-
TULARE COUNTY MOUNTAINS-
600 PM PDT THU MAY 28 2009

...SCATTERED SHOWERS AND THUNDERSTORMS CONTINUE THROUGHOUT MUCH
OF INTERIOR CENTRAL CALIFORNIA...

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP
THROUGHOUT THE SAN JOAQUIN VALLEY...SOUTHERN SIERRA NEVADA...AND
THE TEHACHAPI MOUNTAINS THIS EVENING AND THEN BEGIN TO SUBSIDE
AFTER SUNSET. MOVEMENT IS GENERALLY TOWARD THE NORTHWEST AT AROUND
15 MPH. THE MAIN THREAT FROM THE THUNDERSTORMS WILL BE
HAIL...WHICH COULD APPROACH AN INCH IN DIAMETER IN THE STRONGEST
STORMS. THESE STORMS MAY ALSO CONTAIN...GUSTY WINDS...FREQUENT
LIGHTNING...AND BRIEF HEAVY RAIN. PEOPLE SHOULD MONITOR CONDITIONS
AND SEEK SHELTER IF A THUNDERSTORM APPROACHES.

BSO

WEATHER.GOV/HANFORD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
607 PM PDT THU MAY 28 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             YOSEMITE VALLEY         37.74N 119.60W
05/28/2009  E0.75 INCH       MARIPOSA           CA   UNKNOWN

            AN UNKNOWN SPOTTER IN YOSEMITE LAKES REPORTED 3/4 INCH
            HAIL.

&&

TMOR

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY CA
708 PM PDT THU MAY 28 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             5 SSW COARSEGOLD        37.19N 119.73W
05/28/2009  E0.75 INCH       MADERA             CA   UNKNOWN

            AN UNKNOWN SPOTTER AT YOSEMITE LAKES REPORTED PENNY SIZE
            HAIL.

&&

JBRO

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
725 PM PDT THU MAY 28 2009

CAZ094-097-290415-
TULARE COUNTY FOOTHILLS-TULARE COUNTY MOUNTAINS-
725 PM PDT THU MAY 28 2009

...STRONG THUNDERSTORMS TO AFFECT THE SOUTHERN SIERRA...FOOTHILLS
AND THE EAST SIDE OF THE SAN JOAQUIN VALLEY OF TULARE COUNTY
THROUGH 830 PM...

AN AREA OF STRONG THUNDERSTORMS WILL MOVE NORTHEAST ACROSS THE
CAMP NELSON...SPRINGVILLE AND PONDEROSA VICINITIES THROUGH 830 PM.
THESE STORMS WILL PRODUCE LOCALLY HEAVY RAIN...HAIL AND GUSTY
WINDS TO AROUND 45 MPH. THE STORMS MAY REACH INTO THE PORTERVILLE
VICINITY WITH BRIEF RAIN...LIGHTNING AND GUSTY WINDS TO 40 MPH. PEOPLE
SHOULD MONITOR CONDITIONS AND SEEK SHELTER IF A THUNDERSTORM
APPROACHES.

WEATHER.GOV/HANFORD