Wind Advisory 17, NWS Sacramento, CA

000 
WWUS76 KSTO 210105
NPWSTO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
605 PM PDT TUE MAY 20 2008

CAZ015>017-210600-
/O.EXA.KSTO.WI.Y.0017.000000T0000Z-080521T0600Z/
NORTHERN SACRAMENTO VALLEY-CENTRAL SACRAMENTO VALLEY-
SOUTHERN SACRAMENTO VALLEY-
605 PM PDT TUE MAY 20 2008

...WIND ADVISORY IN EFFECT UNTIL 11 PM PDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A WIND
ADVISORY...WHICH IS IN EFFECT UNTIL 11 PM PDT THIS EVENING. 

WEST TO NORTHWEST WINDS OF 25 TO 35 MPH...WITH GUSTS AS HIGH AS
45 MPH WILL CONTINUE THIS EVENING. WINDS WILL DECREASE TO 15 TO 25
MPH OVERNIGHT.

STRONG AND GUSTY WINDS CAN MAKE DRIVING DIFFICULT...ESPECIALLY
FOR HIGH PROFILE VEHICLES. USE EXTRA CAUTION.

$$

CAZ018-019-210600-
/O.CON.KSTO.WI.Y.0017.000000T0000Z-080521T0600Z/
CARQUINEZ STRAIT AND DELTA-NORTHERN SAN JOAQUIN VALLEY-
605 PM PDT TUE MAY 20 2008

...WIND ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING. 

SOUTHWEST WINDS OF 25 TO 35 MPH...WITH GUSTS TO 45 MPH WILL
CONTINUE THIS EVENING. WINDS WILL SHIFT TO THE NORTHWEST AND
DECREASE TO 15 TO 25 MPH BY MIDNIGHT.

STRONG AND GUSTY WINDS CAN MAKE DRIVING DIFFICULT...ESPECIALLY
FOR HIGH PROFILE VEHICLES. USE EXTRA CAUTION.

$$

SG

000 
WWUS76 KSTO 210441
NPWSTO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SACRAMENTO CA
941 PM PDT TUE MAY 20 2008


CAZ015>019-210545-
/O.CAN.KSTO.WI.Y.0017.000000T0000Z-080521T0600Z/
NORTHERN SACRAMENTO VALLEY-CENTRAL SACRAMENTO VALLEY-
SOUTHERN SACRAMENTO VALLEY-CARQUINEZ STRAIT AND DELTA-
NORTHERN SAN JOAQUIN VALLEY-
941 PM PDT TUE MAY 20 2008

...WIND ADVISORY IS CANCELLED...

WIND SPEEDS HAVE DROPPED BELOW ADVISORY CRITERIA AND THUS THE WIND
ADVISORY HAS BEEN CANCELLED. WIND IS EXPECTED TO INCREASE AGAIN
WEDNESDAY AND ADDITIONAL WIND ADVISORIES MAY BE NEEDED.



$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
300 PM PDT TUE MAY 20 2008

.DISCUSSION...
SFO-RNO GRADIENT UP TO 10 MB THIS AFTERNOON WITH GOOD ONSHORE FLOW
BRINGING THE DELTA BREEZE INTO THE VALLEY. THE MARINE LAYER HAS
MIXED OUT SOME THIS AFTERNOON BEHIND THE FRONT. TEMPERATURES AROUND 8 TO
18 DEGREES COOLER THIS AFTERNOON COMPARED TO YESTERDAY DUE TO THE
ONSHORE FLOW AND A COOLER AIR MASS WITH THE TROUGH AND ASSOCIATED
COLD FRONT MOVING THROUGH TODAY.

THE SHORTWAVE MOVING INTO THE AREA THIS AFTERNOON AND INTO TONIGHT
WILL BRING SOME INSTABILITY FOR ISOLATED SHOWERS AND THUNDERSTORMS
TO THE HIGHER TERRAIN.  AN ISOLATED THUNDERSTORM HAS DEVELOPED OVER
SHASTA COUNTY AROUND 3 PM THIS AFTERNOON. ADDITIONAL SHOWERS AND
THUNDERSTORMS ARE POSSIBLE OVER THE SHASTA COUNTY MOUNTAINS AND
WESTERN PLUMAS COUNTY AND THE NORTHERN SIERRA THIS EVENING AS THE
SHORT WAVE MOVES THROUGH.

THE ONSHORE FLOW WILL TURN NORTHERLY BEHIND THE TROUGH TONIGHT.  THE
MFR-RDD GRADIENT INCREASES DURING THE DAY TOMORROW WITH THE MFR-RDD
GRADIENT EXPECTED TO BE ABOUT 10MB AND THE MFR-SAC ABOUT 14 MB AT 5
PM TOMORROW AFTERNOON. THE JET NOSES INTO THE AREA TOMORROW
AFTERNOON BUT MOVES OVER NORTHERN CALIFORNIA WITH 250 MB WINDS AT
ABOUT 140 KTS ON THURSDAY. 700MB WINDS 40 TO 50 KTS WEDNESDAY
MORNING AND UP TO 50 TO 60 KNOTS THURSDAY MORNING INDICATING GOOD
UPPER LEVEL SUPPORT. THE SURFACE GRADIENT AND UPPER LEVEL SUPPORT
WILL BRING GUSTY NORTHERLY WINDS ACROSS THE AREA TOMORROW INTO
FRIDAY. HELD OFF ON A WINDS ADVISORY FOR NOW BUT EXPECT THE
STRONGEST WINDS WEDNESDAY NIGHT AND THURSDAY SO WILL MONITOR.

THE TROUGH FORMS A CLOSED LOW OVER UTAH LATE WEDNESDAY INTO EARLY
THURSDAY. THE MODEL THEN SHOWS THIS LOW RETROGRADING BACK INTO
CALIFORNIA THURSDAY INTO FRIDAY.  THIS WILL BRING NEAR TO BELOW
NORMAL TEMPERATURES WEDNESDAY THROUGH FRIDAY. THE CLOSED LOW OVER
THE AREA MAY BRING SOME INSTABILITY OVER THE AREA FRIDAY FOR A
SLIGHT THREAT OF SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN.
ALTHOUGH THE MODEL SOLUTIONS VARY WITH THIS LOW SO OUR CONFIDENCE IS
NOT REAL HIGH FOR FRIDAY SO KEPT POPS BELOW 15 PERCENT FOR FRIDAY AT
THIS TIME.  HSO

.EXTENDED DISCUSSION (SATURDAY THROUGH TUESDAY)...BROAD TROUGH OF
LOW PRESSURE WILL REMAIN OVER THE WEST...WITH A SERIES OF WAVES
ROTATING AROUND THE UPPER LEVEL LOW.  AS A RESULT...NORTHERN
CALIFORNIA WILL REMAIN UNDER THE BACK SIDE OF THE TROUGH...WITH A
COUPLE OF THESE WAVES MOVING ACROSS THE REGION SATURDAY AND SUNDAY.
THERE APPEARS TO BE ENOUGH INSTABILITY AND MOISTURE OVER THE
SURROUNDING MOUNTAINS EACH DAY FOR AT LEAST A SLIGHT CHANCE OF
SHOWERS OR THUNDERSTORMS.  TEMPERATURES WILL ALSO REMAIN BELOW
NORMAL THROUGH THE WEEKEND.  THE EXTENDED MODELS ARE TRYING TO LIFT
THIS TROUGH OUT OF THE REGION EARLY NEXT WEEK...BUT IT APPEARS
ANOTHER ONE WILL TAKE ITS PLACE.  THEREFORE...WILL WARM TEMPERATURES
SLIGHTLY EARLY NEXT WEEK...WITH DRY CONDITIONS PREVAILING.  PALMER

&&

.AVIATION...THE TAIL END OF THE COLD FRONT WILL CONTINUE TO MOVE
ACROSS NORTHERN CALIFORNIA THIS AFTERNOON AND EVENING...BRINGING
GUSTY SOUTHWEST WINDS ACROSS THE REGION.  THE STRONGEST WINDS
CONTINUE TO BE NEAR THE CARQUINEZ STRAIT AND OVER THE RIDGES
TOPS...WITH SUSTAINED WINDS OF 20-30KTS AND GUSTS TO AROUND 35KTS
EXPECTED TO CONTINUE THROUGH THE EVENING.  WINDS WILL SHIFT TO THE
NORTH BEHIND THE FRONT.  THESE NORTH WINDS WILL INCREASE AND SPREAD
DOWN THE VALLEY TONIGHT AND WEDNESDAY...WITH GUSTY CONDITIONS
DEVELOPING ACROSS THE REGION.  ISOLATED SHOWERS AND THUNDERSTORMS
WILL CONTINUE TO BE POSSIBLE THIS AFTERNOON AND EVENING OVER THE
NORTHERN MOUNTAINS AND SIERRA AS A SECONDARY VORT MOVES INTO THE
REGION...WITH LOCAL MVFR CONDITIONS POSSIBLE IN THESE SHOWERS.

&&

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

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SACRAMENTO CA
330 PM PDT TUE MAY 20 2008

CAZ013>019-063-064-066>069-211400-
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-
330 PM PDT TUE MAY 20 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR INTERIOR NORTHERN CALIFORNIA.

.DAY ONE...TODAY

AN UNSEASONABLY STRONG COLD FRONT WILL MOVE SOUTHWARD INTO NORTHERN
CALIFORNIA LATER TODAY RESULTING IN ISOLATED SHOWERS AND THUNDERSTORMS
ACROSS THE NORTHERN MOUNTAINS THIS AFTERNOON...AND DOWN THE NORTHERN
SIERRA NEVADA OVERNIGHT TONIGHT. GUSTY NORTHWEST WINDS WILL DEVELOP
ACROSS THE REGION FOLLOWING THE COLD FRONTAL PASSAGE.

.DAYS TWO THROUGH SEVEN... WEDNESDAY THROUGH MONDAY

NORTHERLY WINDS ARE EXPECTED TO INCREASE OVER THE AREA ON WEDNESDAY
WITH GUSTY WINDS CONTINUING THROUGH FRIDAY. A THREAT OF SHOWERS AND
THUNDERSTORMS ARE POSSIBLE OVER THE WEEKEND AS THE TROUGH BECOMES AN UPPER
LOW AND RETROGRADES BACK OVER CALIFORNIA.

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

HSO

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
355 PM PDT TUE MAY 20 2008

CAZ013>019-063-064-066>069-211200-
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-
355 PM PDT TUE MAY 20 2008

...GUSTY NORTHERLY WINDS ARE EXPECTED OVER INTERIOR NORTHERN
CALIFORNIA WEDNESDAY THROUGH FRIDAY...

AN UPPER LEVEL TROUGH WILL MOVE TO THE EAST OF THE AREA TONIGHT
BRINGING NORTH WINDS ALONG THE BACK SIDE. A NORTHERLY SURFACE
PRESSURE GRADIENT WILL INCREASE ON WEDNESDAY AS SURFACE HIGH
PRESSURE BUILDS INTO OREGON. A 140 KT JET WILL MOVE OVER THE AREA
WEDNESDAY NIGHT INTO THURSDAY. THE NORTHERLY SURFACE PRESSURE
GRADIENT AND UPPER LEVEL SUPPORT WILL BRING GUSTY NORTHERLY WINDS
OVER INTERIOR NORTHERN CALIFORNIA WEDNESDAY THROUGH FRIDAY.
NORTHERLY WINDS OF 15 TO 30 MPH WITH GUSTS TO AROUND 40 MPH ARE
POSSIBLE. THE STRONGEST WINDS ARE EXPECTED WEDNESDAY NIGHT INTO
THURSDAY. THE WINDS ARE EXPECTED TO WEAKEN DURING THE DAY ON
FRIDAY.

STRONG AND GUSTY WINDS CAN MAKE DRIVING DIFFICULT...ESPECIALLY
FOR HIGH PROFILE VEHICLES. USE EXTRA CAUTION ESPECIALLY AT HIGHER
SPEEDS.

CONTINUE TO MONITOR THE LATEST WEATHER UPDATES FROM THE NATIONAL
WEATHER SERVICE SACRAMENTO REGARDING THIS SITUATION.

HSO