Wind Advisory 15, NWS Sacramento, CA

000 
WWUS76 KSTO 122300
NPWSTO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
400 PM PDT MON MAY 12 2008


CAZ015>017-130000-
/O.EXP.KSTO.WI.Y.0015.000000T0000Z-080512T2300Z/
NORTHERN SACRAMENTO VALLEY-CENTRAL SACRAMENTO VALLEY-
SOUTHERN SACRAMENTO VALLEY-
400 PM PDT MON MAY 12 2008

...WIND ADVISORY WILL EXPIRE AT 4 PM PDT THIS AFTERNOON...

THE WIND ADVISORY WILL EXPIRE AT 4 PM PDT THIS AFTERNOON. 

NORTHERLY WINDS HAVE DROPPED BELOW ADVISORY CRITERIA BUT WILL
REMAIN AT 10 TO 25 MPH THIS EVENING.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
340 AM PDT MON MAY 12 2008

.DISCUSSION...
BROAD AREA OF MID/HI CLOUDS ENHANCING OVER NORCAL THIS MORNING
COURTESY OF DIVERGENCE IN LEFT FRONT QUADRANT OF A 115KT JET ON THE
BACK SIDE OF AN UPPER LOW...FORECAST TO SLIDE EAST OF OUR AREA BY
AFTERNOON. CORE OF GUSTY N-NW WINDS HAS DEVELOPED ALONG THE WEST
SIDE OF THE VALLEY. CANSAC MM5 SHOW THESE WILL CONTINUE UNTIL 21Z OR
SO AS COLD AIR CONTINUES TO SPILL INTO THE TROF. SOME GUSTS TO 35
MPH ARE POSSIBLE IN WIND PRONE AREAS. LOWER CLOUDS ALONG THE WEST
SLOPE OF THE SIERRA SHOULD SCOUR OUT LATER THIS MORNING. SOME
MOISTURE MAY SPILL OVER THE SIERRA IN A NORTHEAST FLOW LATER THIS
MORNING...HOWEVER THE ATMOSPHERE IS EXPECTED TO REMAIN DRY ENOUGH TO
PREVENT ANY SHOWERS FROM DEVELOPING.

THE WELL ADVERTISED WARMUP BEGINS TOMORROW AS A STRONG UPPER RIDGE
DEVELOPS ALONG THE WEST COAST AND BUILDS STRONGLY INTO NORTHERN
CALIFORNIA BY MID-WEEK. MEDIUM RANGE MODELS IN GOOD AGREEMENT
SHOWING VERY STRONG 500MB HEIGHT RISES OVER NORTHERN CALIFORNIA.
ADDITIONALLY...A STRONG SURFACE THERMAL TROF WILL BE IN PLACE OVER
THE VALLEYS BY THURSDAY. H850 TEMPERATURES 25-26C WILL COMBINE WITH
A LIGHT OFFSHORE FLOW TO BRING SOME HIGHS OVER 100
DEGREES...ESPECIALLY THURSDAY AND FRIDAY. SOME RECORD HIGH
TEMPERATURES WILL PROBABLY BE SET DURING THIS TIME PERIOD.
OVERNIGHT LOWS MAY BE QUITE WARM IN THERMAL BELTS IN THE FOOTHILLS
BY THE END OF THE WEEK. NCEP ENSEMBLE MEANS SUGGEST THE 850MB TEMPS
WITH THIS RIDGE WILL EXCEED 2 STANDARD DEVIATIONS ABOVE THE
NORMAL...SO THIS WILL BE AN UNUSUALLY STRONG RIDGE FOR THIS TIME OF
YEAR. WILL ISSUE AN SPS THIS MORNING TO COVER THE HOT WEEK AHEAD.

PREFER THE ECMWF...WHICH HAS BEEN CONSISTENTLY WARMER...AND DOES NOT
BREAK THE STRONG RIDGE DOWN AS FAST AS THE GFS. THERMAL TROF MAY
SHIFT EAST TO THE SIERRA CREST BY THE WEEKEND...FOR A LITTLE COOLING
AND POSSIBLE CUMULUS BUILDUPS OVER THE MOUNTAINS. EXTENDED FORECAST
WAS UPDATED TO WARM TEMPERATURES IN HIGH MOUNTAIN VALLEY LOCATIONS
SUCH AS QUINCY...AND SLOW THE COOLING TREND INTO DAY 7. SG

&&

.AVIATION...
UPR TROF DIGG INTO GRT BASIN AS UPR RDG APCHS W CST. VFR CONDS OVR
INTR NORCAL NXT 24 HRS WITH LCL SCT-BKN CLDS AOA FL070 TIL 01Z TUE.
STG NLY FLOW ALF OVR INTR NORCAL TDA INTO TUE WITH AREAS N-NE SFC
WND GSTS 25-35 KTS OMTNS. AREAS NLY SFC WND TO 25 KTS IN INTR VLY
TIL 00Z TUE WITH LLWS AT KSMF/KSAC/KMHR TIL 15Z THIS MRNG.

&&

.STO WATCHES/WARNINGS/ADVISORIES...NONE.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
700 AM PDT MON MAY 12 2008

CAZ013>019-063-064-066>069-131400-
SHASTA LAKE AREA/NORTHERN SHASTA COUNTY-
BURNEY BASIN/EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY-
CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY-
CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY-
MOUNTAINS SOUTHWESTERN SHASTA TO NORTHERN LAKE COUNTIES-
CLEAR LAKE/SOUTHERN LAKE COUNTY-MOTHERLODE-
EAST FOOTHILLS/NORTH SACRAMENTO VALLEY-
WESTERN PLUMAS COUNTY/LASSEN PARK-WEST SLOPE NORTHERN SIERRA NEVADA-
700 AM PDT MON MAY 12 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA.

.DAY ONE...TODAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN... TUESDAY THROUGH SUNDAY

VERY STRONG HIGH PRESSURE MAY BRING TEMPERATURES OVER 100 DEGREES IN
THE SACRAMENTO AND NORTHERN SAN JOAQUIN VALLEYS THURSDAY AND FRIDAY.
WARM TEMPERATURES IN THE MOUNTAINS WILL ACCELERATE SNOW
MELT...POSSIBLY RESULTING IN RAPIDLY RUNNING STREAMS.

* SPECIAL WEATHER STATEMENT..SEE WWUS86 KSTO - SPSSTO FOR DETAILS *

THE LATEST WEATHER INFORMATION IS AVAILABLE ON THE INTERNET AT
(LOWER CASE): HTTP://WWW.WRH.NOAA.GOV/STO

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
418 AM PDT MON MAY 12 2008

CAZ013>019-063-064-066>069-130000-
SHASTA LAKE AREA / NORTHERN SHASTA COUNTY-
BURNEY BASIN / EASTERN SHASTA COUNTY-NORTHERN SACRAMENTO VALLEY-
CENTRAL SACRAMENTO VALLEY-SOUTHERN SACRAMENTO VALLEY-
CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY-
MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO NORTHERN LAKE COUNTY-
CLEAR LAKE/SOUTHERN LAKE COUNTY-
NORTHEAST FOOTHILLS/SACRAMENTO VALLEY-MOTHERLODE-
WESTERN PLUMAS COUNTY/LASSEN PARK-
WEST SLOPE NORTHERN SIERRA NEVADA-
418 AM PDT MON MAY 12 2008

...HOT TEMPERATURES POSSIBLE LATER THIS WEEK...

AN UNUSUALLY STRONG HIGH PRESSURE RIDGE WILL BUILD INTO NORTHERN
CALIFORNIA BY THE MIDDLE OF THE WEEK. THIS COULD RESULT IN HIGH
TEMPERATURES AS MUCH AS 20 DEGREES ABOVE SEASONAL NORMALS THURSDAY
AND FRIDAY. TEMPERATURES AT OR ABOVE 100 DEGREES ARE POSSIBLE BOTH
DAYS IN REDDING...RED BLUFF...SACRAMENTO...STOCKTON AND MODESTO.
RECORD HIGH TEMPERATURES MAY BE SET DURING THIS TIME PERIOD.
ADDITIONALLY...VERY WARM TEMPERATURES IN THE 80S TO LOWER 90S ARE
POSSIBLE IN THE MOUNTAINS. VERY WARM OVERNIGHT TEMPERATURES MAY
OCCUR IN THE EASTERN FOOTHILLS AND MOTHERLODE THURSDAY
NIGHT...PERHAPS REMAINING IN THE 70S.

AS HOT WEATHER DEVELOPS IT IS IMPORTANT TO STAY HYDRATED AND SLOW
DOWN. ADDITIONALLY...THOSE PLANNING TO COOL OFF IN HIGH MOUNTAIN
STREAMS MAY FIND INCREASED FLOWS FROM A RAPID MELTING OF THE
REMAINING SNOWPACK LATER THIS WEEK. REMEMBER THAT RAPIDLY FLOWING
MOUNTAIN STREAMS WILL BE VERY COLD...AND POTENTIALLY DANGEROUS.

A COOLING TREND MAY DEVELOP OVER THE WEEKEND AS HIGH PRESSURE
WEAKENS.

SG