Wind Advisory 17, NWS Hanford, CA

249 
WWUS76 KHNX 101726
NPWHNX

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HANFORD CA
1026 AM PDT TUE APR 10 2012

CAZ092-095-101830-
/O.CAN.KHNX.WI.Y.0017.000000T0000Z-120411T0300Z/
SOUTHEASTERN SAN JOAQUIN VALLEY-KERN COUNTY MOUNTAINS-
1026 AM PDT TUE APR 10 2012

...WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN HANFORD HAS CANCELLED THE WIND
ADVISORY FOR THE GRAPEVINE AND THE SOUTH END OF THE SAN JOAQUIN
VALLEY.  

WINDS OVER THE GRAPEVINE AND THE SOUTH END OF THE SAN JOAQUIN
VALLEY HAVE SUBSIDED AS THE APPROACHING COLD FRONT HAS STALLED
WEST OF THE REGION. WINDS MAY INCREASE TONIGHT...BUT ARE EXPECTED
TO REMAIN BELOW ADVISORY LEVELS.

$$

SANGER

WEATHER.GOV/HANFORD

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
821 PM PDT MON APR 9 2012

.SYNOPSIS...
MID AND HIGH CLOUDS ASSOCIATED WITH A LOW PRESSURE CENTER LOCATED
OFF THE CALIFORNIA COAST IS ADVANCING OVER THE AREA. THIS SYSTEM IS
EXPECTED TO MOVE THROUGH THE REGION ON TUESDAY AND WEDNESDAY...
PRODUCING LIGHT TO MODERATE PRECIPITATION OVER THE AREA. ANOTHER...
COLDER...SYSTEM IS EXPECTED LATER IN THE WEEK.

&&

.DISCUSSION (UPDATE)...
MARINE AIR INTRUSION ENTERING FROM THE WEST SIDE OF THE VALLEY
HAS ALLOWED WINDS TO PICK UP TO ADVISORY LEVEL THIS EVENING WITH
BLOWING DUST POSSIBLE ALONG THE INTERSTATE 5 CORRIDOR. WENT AHEAD
AND ISSUED A WIND ADV UNTIL 2 AM. HNX RADAR INDICATED THE BOUNDARY
QUITE NICELY AS IT MOVES THROUGH THE CENTRAL VALLEY. THIS WILL BE
THE PRECURSOR FOR COOLER TEMPS ON TUESDAY AS MARINE AIR HAS NOW
ENTERED THE VALLEY IN ADVANCE OF THE APPROACHING COLD FRONT
EXPECTED TO MOVE IN HERE TOMORROW NIGHT. WE HAVE UPDATED ALL
ROUTINE PRODUCTS TO REFLECT THE NEW WIND CONDITIONS AND HAVE
UPDATE THE WEBPAGE AS WELL AS OUR FACEBOOK PAGE.

PLEASE FEEL FREE TO VISIT OUR WEBPAGE AT WWW.WEATHER.GOV/HANFORD
FOR YOUR SOURCE OF WEATHER INFORMATION.

NO CHANGES TO EXTENDED FORECAST.

&&

.PREV DISCUSSION... /ISSUED 334 PM PDT MON APR 9 2012/

DISCUSSION...
AN ACTIVE WEATHER WEEK IS ON TAP AS TWO WINTER-LIKE STORMS ARE
HEADED FOR THE CENTRAL CALIFORNIA INTERIOR. AHEAD OF THESE STORMS...
A WARM AND VERY DRY AIRMASS IS IN PLACE OVER THE HANFORD WARNING/
FORECAST AREA. AT 21Z /1400 PDT/...RELATIVE HUMIDITIES WERE IN
SINGLE DIGITS OVER PARTS OF THE KERN COUNTY MOUNTAINS...ESPECIALLY
THE PIUTES...WHERE A RED FLAG WARNING CONTINUES THROUGH 00Z
WEDNESDAY /1700 PDT TUESDAY/.

SATELLITE LOOPS SHOW THE UPPER-LEVEL LOW FOR THE FIRST STORM NEAR
42N/137W...WEST OF THE OREGON COAST. THIS STORM IS FORECAST TO REACH
WESTERN MERCED COUNTY BY TUESDAY AFTERNOON...WITH PRECIPITATION
SPREADING SOUTH OVER THE HANFORD WARNING/FORECAST AREA TUESDAY
NIGHT.
SNOW LEVELS WILL START OUT ABOVE 7000 FEET TUESDAY AFTERNOON..BUT
FALL TO AROUND 5000 FEET NEAR YOSEMITE WEDNESDAY AND TO AROUND 5500
FEET IN THE TEHACHAPI MOUNTAINS.

20Z RFC QPF GUIDANCE FOR THIS STORM IS 1.10 INCH FOR YOSEMITE
VALLEY...0.90 INCH FOR GIANT FOREST AND 0.46 INCH FOR FRESNO. THESE
VALUES ARE ONLY SLIGHTLY BELOW THE 14Z RFC QPF. BASED ON THIS
GUIDANCE...SNOW ACCUMULATIONS OF AROUND A FOOT ARE LIKELY OVER THE
HIGH COUNTRY OF THE SOUTHERN SIERRA NEVADA. HAVE ISSUED A WINTER
STORM WATCH /SFOWSWHNX OR WWUS46 KHNX/ FOR THE SOUTHERN SIERRA NEVADA
FROM YOSEMITE TO THE KERN COUNTY LINE FOR TUESDAY EVENING THROUGH
WEDNESDAY EVENING.

THE TROUGH AXIS IS FORECAST TO MOVE THROUGH THE CENTRAL CALIFORNIA
INTERIOR BETWEEN 18-24Z /1100-1700 PDT/ WEDNESDAY. A 500-MB COLD POOL
IS FORECAST TO MOVE OVER THE CENTRAL SAN JOAQUIN VALLEY WITH
TEMPERATURES OF -27C TO -29C. BY 18Z WEDNESDAY...SURFACE-COMPUTED
CAPES OVER THE SAN JOAQUIN VALLEY ARE 300+ JOULES/KG WITH SURFACE-
COMPUTED LIFTED INDICES FROM 0 TO -2. BOUNDARY-LAYER POSITIVE
BUOYANCY ENERGY IS FORECAST TO BE 140+ JOULES/KG AND BOUNDARY-LAYER
BEST LIFTED INDICES ARE AROUND 0. THE CURRENT FORECAST OF A CHANCE
OF
THUNDERSTORMS FOR THE CENTRAL/SOUTHERN SAN JOAQUIN VALLEY AND THE
ADJACENT FOOTHILLS LOOKS ON TRACK.

THE SECOND OF THE TWO STORMS IS SOUTH OF THE ALEUTIAN ISLANDS NEAR
48N/173W. THIS STORM IS FORECAST TO REACH THE NORTHERN PART OF THE
HANFORD WARNING/FORECAST AREA THURSDAY AFTERNOON AND SPREAD SOUTH
THURSDAY NIGHT. THIS STORM HAS THE POTENTIAL TO BE A COLDER AND
WETTER SYSTEM THAN THE MIDWEEK STORM. 1000-500-MB THICKNESSES OVER
THE TEHACHAPI MOUNTAINS ARE FORECAST TO FALL TO 5400 METERS BY 12Z
/0500 PDT/ FRIDAY...WHICH CORRESPONDS TO A SNOW LEVEL AROUND 4000
FEET. THE 18Z GFS GIVES FRAZIER PARK A QPF OF 0.28 INCH FROM THIS
SECOND STORM...AND 0.16 INCH AT TEHACHAPI. AS THE SNOW LEVEL IS
BELOW THE HIGH POINTS OF THE TEJON AND TEHACHAPI PASSES...ONE OR TWO
INCHES OF ACCUMULATING SNOW COULD FALL ON THE MAJOR ROUTES BETWEEN
THE SAN JOAQUIN VALLEY AND THE SOUTHLAND.

THE MODELS BUILD AN UPPER-LEVEL RIDGE INTO CALIFORNIA FOR THE FIRST
PART OF NEXT WEEK...WITH 500-MB HEIGHTS OF 5760 METERS AS FAR NORTH
AS AT LEAST REDDING. THIS WILL BRING A RETURN OF DRY AND WARM WEATHER
TO THE REGION.

&&

.AVIATION...
GUSTY WINDS TO 35 KTS WILL BE POSSIBLE ALONG THE WEST SIDE OF THE
SAN JOAQUIN VALLEY UNTIL 09Z TUESDAY. OTHERWISE VFR CONDITIONS
ACROSS THE CENTRAL CA INTERIOR THRU 06Z WED. A CHANCE OF
-RA ACROSS MERCED COUNTY AFT 19Z TUES WITH CIGS AOA FL050.

&&

.FIRE WEATHER...
FOR THE KERN COUNTY MOUNTAINS...OBSERVATIONS INDICATE LITTLE
CHANGE HAS OCCURRED OVER THE PAST 24 HOURS. RELATIVE HUMIDITIES IN
THE PIUTES REMAIN EXTREMELY LOW...WITH A NUMBER OF STATIONS AT AND
ABOVE 5000 FEET REPORTING SINGLE DIGIT HUMIDITIES. DEW POINTS AT A
COUPLE OF SITES /BRECKENRIDGE FOR ONE/ HAVE BEEN AS LOW AS -51 DEGS,
POOR NIGHTTIME RECOVERY IS EXPECTED TO CONTINUE...AND THE RED FLAG
WARNING WILL REMAIN IN EFFECT. IMPROVED CONDITIONS ARE EXPECTED
LATER TUES AS PACIFIC MOISTURE MOVES INTO THE AREA.

&&

.AIR QUALITY ISSUES...
NONE.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WATCH FROM TUESDAY EVENING THROUGH WEDNESDAY
EVENING ABOVE 5000 FEET FOR THE CAZ096-097.

RED FLAG WARNING UNTIL 5 PM PDT TUESDAY CAZ095.

WIND ADVISORY UNTIL 2 AM PDT TUESDAY CAZ089-091.

&&

PUBLIC...JDB
AVN/FW...MV
SYNOPSIS...JDB

WEATHER.GOV/HANFORD

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
213 AM PDT TUE APR 10 2012

CAZ089>099-110915-
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-INDIAN WELLS VALLEY-
SOUTHEASTERN KERN COUNTY DESERT-
213 AM PDT TUE APR 10 2012

...UNSETTLED WEATHER THIS WEEK...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF INTERIOR CENTRAL
CALIFORNIA.

.DAY ONE...TONIGHT

A RED FLAG WARNING FOR VERY LOW HUMIDITY AND POOR RECOVERY IS IN
EFFECT FOR THE KERN COUNTY MOUNTAINS...INCLUDING THE PIUTE
MOUNTAINS. PLEASE REFER TO THE LATEST RED FLAG WARNING /SFORFWHNX/
FOR MORE DETAILS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE RED FLAG WARNING WILL REMAIN IN EFFECT UNTIL 5 PM PDT TUESDAY
FOR THE KERN COUNTY MOUNTAINS. PLEASE REFER TO THE LATEST RED
FLAG WARNING /SFORFWHNX/ FOR MORE DETAILS.

A WINTER STORM WATCH IS IN EFFECT FOR THE SOUTHERN SIERRA NEVADA
FROM YOSEMITE TO THE TULARE-KERN COUNTY LINE FROM TUESDAY EVENING
UNTIL WEDNESDAY EVENING. PLEASE REFER TO THE LATEST WINTER STORM
WATCH /SFOWSWHNX/ FOR MORE DETAILS.

THUNDERSTORMS ARE POSSIBLE WEDNESDAY AFTERNOON IN THE CENTRAL AND
SOUTHERN SAN JOAQUIN VALLEY AND SIERRA NEVADA FOOTHILLS FROM
MARIPOSA TO TULARE COUNTIES. PLEASE REFER TO THE SPECIAL WEATHER
STATEMENT /SFOSPSHNX/ FOR MORE DETAILS.

ANOTHER WINTER-LIKE STORM SYSTEM IS EXPECTED TO IMPACT MUCH OF
INTERIOR CENTRAL CALIFORNIA THURSDAY NIGHT THROUGH SATURDAY.
PLEASE REFER TO THE SPECIAL WEATHER STATEMENT /SFOSPSHNX/ FOR MORE
DETAILS.

STAY TUNED AS FURTHER STATEMENTS MAY BE ISSUED.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT OR
UNUSUAL CONDITIONS TO THE NATIONAL WEATHER SERVICE.

WP