Severe Thunderstorm Warning 3, NWS Hanford, CA

INTERIOR CENTRAL CALIFORNIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
945 AM PST SUN FEB 27 2000

MAIN FRONTAL BAND HAS MOVED INTO SOUTHERN SIERRA NEVADA AND KERN
COUNTY MOUNTAINS...AND HAS ALLOWED FOR JUST A TEMPORORARY BREAK IN
THE ACTION FOR THE W/NW PORTIONS OF THE SJ VLLY. UNSTABLE AIRMASS
WILL MOVE IN RIGHT BEHIND THRU THIS AFTN...WITH PLENTY OF SHOWER
ACTIVITY ALREADY INDICATED ON KMUX RADAR. LOTS OF FORECAST CONCERNS
ON UPDATE CYCLE. THREAT OF CONVECTION PRESENT WITH SOME CLEARING...
MODEL RUNS SHOWING NEGATIVE LIFTED INDICES AND CAPES 200-700 J/KG...
AND CONSIDERABLE LLVL SHEAR/HELICITY WITH UPVALLEY SE WINDS 15-25KTS
IN LOWEST 1-2KFT. HAVE ISSUED THUNDERSTORM OUTLOOK FOR THIS AFTN AND
WILL CONTINUE TO MONITOR THIS VERY CLOSELY FOR SVR POTENTIAL. ANY
STRONGER CONVECTIVE CELLS WHICH COULD DEVELOP MAY WELL PRODUCE HAIL
AND GUSTY WINDS.

SPOTTERS IN FOOTHILLS LOCATIONS HAVE REPORTED AROUND 1.75 TO 2 INCH
AMOUNTS THRU EARLY MORN AND SMALL STREAMS HAVE RESPONDED QUICKLY...
THUS POSTED SMALL STREAM FLOOD ADVISORY FOR THE FOOTHILLS NORTH OF
KERN COUNTY. SPOTTERS HAVE GENERALLY INDICATED THE HIGHEST VOLUME
AND STREAM LEVELS THUS FAR THIS SEASON...WITH SOME CLOSURES OF FLOOD
PRONE ROADS IN MARIPOSA COUNTY.

CURRENT WINTER STORM WARNINGS ARE IN GOOD SHAPE FOR ALL MTN ZNS...
HOWEVER DID NEED TO ADJUST SNOW LEVELS DOWNWARD BASED ON MORNING
REPORTS. WSW/WARNING WAS ISSUED EARLIER AT 635 AM FOR KERN MTNS.
IN NORTHERN SECTIONS OF THE CWA SNOW WAS BELOW YOSEMITE VALLEY FLOOR
...AT 8 AM WAS STICKING ABOVE 3000 FEET. WITH ADDITIONAL SNOW
SHOWERS LIKELY THIS AFTN/EVE AND SNOW LEVELS LOWERING NEAR 3000 TO
3500 FEET DOWN THRU TULARE FOOTHILS...WENT AHEAD AND POSTED SNOW
ADVISORY FOR FOOTHILLS ABOVE 3000 FEET.

SHORTWAVE RIDGING WILL PROVIDE A TEMPORARY RESPITE FROM INCLEMENT
WEATHER MON/WED...MEDIUM RANGE PROGS SHOW UPPER PATTERN REMAINING
VERY PROGRESSIVE THROUGH DAY 5 WITH THE POTENTIAL FOR MORE PRECIP
MON NIGHT/TUES AND AGAIN ON THURS.

.HNX...WINTER STORM WARNING ABOVE 4000 FEET FOR THE SOUTHERN
       SIERRA NEVADA NORTH OF KERN COUNTY UNTIL 900 PM TONIGHT.
    ...WINTER STORM WARNING ABOVE 4500 FEET FOR THE KERN COUNTY
       MOUNTAINS THROUGH TONIGHT.
    ...SMALL STREAM FLOOD ADVISORY FOR THE FOOTHILLS OF THE SIERRA
       NEVADA NORTH OF KERN COUNTY UNTIL 4 PM.
    ...SNOW ADVISORY FOR THE FOOTHILLS OF THE SIERRA NEVADA NORTH OF
       KERN COUNTY UNTIL 9 PM.

LAVIS

CAZ089>092-280000-

SPECIAL WEATHER STATEMENT...CONVECTIVE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
900 AM PST SUN FEB 27 2000

...ISOLATED THUNDERSTORMS POSSIBLE THIS AFTERNOON IN THE CENTRAL
AND SOUTHERN SAN JOAQUIN VALLEY...

A COLD FRONT MOVING SOUTHEASTWARD ACROSS THE REGION THIS MORNING
WILL BE FOLLOWED BY POTENTIALLY UNSTABLE ATMOSPHERIC CONDITIONS
IN THE SAN JOAQUIN VALLEY LATER TODAY. AN UPPER LEVEL DISTURBANCE
COMBINED WITH WARMING AND ABUNDANT MOISTURE IN THE LOWER LEVELS...
WILL SET THE STAGE FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON.

SOME THUNDERSTORMS MAY BE ACCOMPANIED BY LOCALLY HEAVY RAIN...
STRONG AND GUSTY WINDS AND SMALL HAIL. RESIDENTS OF THE CENTRAL
AND SOUTHERN SAN JOAQUIN VALLEY SHOULD KEEP A WATCHFUL EYE ON THE
SKY TODAY AND BE PREPARED TO MOVE INDOORS IF SEVERE WEATHER
THREATENS.

STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE NEWS SOURCE FOR
tFURTHER UPDATES ON THIS DEVELOPING WEATHER PATTERN.

DURFEE