Freeze Watch 1, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
400 PM PST WED JAN 10 2007

.SYNOPSIS...EXTREMELY COLD AIR WILL PUSH ACROSS NW CALIFORNIA
TONIGHT. SHOWERS AND SNOW SHOWERS WILL PERSIST OVERNIGHT THROUGH
THURSDAY...AS A NORTHWEST JET IMPACTS THE REGION. AS THE COLD AIR
MOVES IN AND SNOW LEVELS DROP LATER TONIGHT...SHOWERS AT THE COAST
WILL ALSO CONTAIN EITHER SMALL HAIL OR WET SNOW. SHOWERS WILL TAPER
ACROSS THE REGION LATE THURSDAY...BUT THE COLD AIR WILL PERSIST
THROUGH FRIDAY NIGHT. WARMER AND DRIER WEATHER IS ON TAP FOR THE
WEEKEND AND EARLY NEXT WEEK.

&&

.DISCUSSION...SHOWERS AT THE REDWOOD COAST AND NORTH COAST INTERIOR
HAVE BEGUN TO PICK UP AS THE NOSE OF A 140 KT NW JET PUSHES OVER THE
NW CA COASTAL WATERS. THE COLDEST AIR WITH THIS SYSTEM IS STILL OVER
THE NORTH HALF OF WESTERN OREGON AND NORTH INTO WESTERN WASHINGTON.
GUIDANCE CONTINUES THE TREND EVIDENT IN SATELLITE IMAGERY...AS WELL
AS SFC OBS AND THE SALEM SOUNDING...TO PUSH VERY COLD AIR SOUTH AND
BRING A SOUNDING PROFILE THAT WILL SUPPORT DEEPER CONVECTION AND
EXTREMEMLY LOW SNOW LEVEL TONIGHT AND THURSDAY. GFS SEEMS TO HAVE
THE BEST TRACK RECORD WITH THE MAIN FEATURES WITH THIS SYSTEM...EVEN
THE AREAL COVERAGE OF SHOWERS. SO WITH THE JET SUPPORTING
INCREASINGLY STRONG SHOWERS TONIGHT HAVE ISSUED A SNOW ADVISORY FOR
THE NORTHWEST INTERIOR. SIGNIFICANT ACCUMULATIONS ARE UNLIKELY TO
PUSH MUCH FARTHER EAST OR SOUTH AS THE CONVECTIVE ENERGY GETS
RELEASED IN STEEP NW FLOW IN THE COAST RANGE.

WITH THE RAPID DRYING AND OFFSHORE FLOW THAT DEVELOPS THURSDAY NIGHT
THROUGH FRIDAY NIGHT...AS THE COLD POOL CONTINUES ITS PUSH SOUTH...
HAVE KEPT THE GOING FORECAST FOR EXTREMELY LOW TEMPERATURES FOR
FRIDAY MORNING AND SATURDAY MORNING ALL AREAS. THIS WILL UNDOUBTEDLY
REQUIRE A HARD FREEZE WARNING FOR ZONES 1 AND 2 (HUMBOLDT/DEL
NORTE/MENDOCINO COASTS) FOR THESE RECORD BREAKING LOWS.

ONCE THE COLD POOL IS WELL SOUTH AND EAST THIS WEEKEND...NUMERICAL
GUIDANCE CONTINUES TO INDICATE A STRONG RIDGE BUILDING ALONG THE
WEST COAST...WITH A WEAK SYSTEM PUSHING INTO THE PACIFIC NW SAT-SUN
NOT IMPACTING NW CA. THE RIDGE IS EXPECTED TO HOLD FAST THROUGH
EARLY NEXT WEEK...AFTER WHICH SOME SIGNFICANT DISPARITIES DEVELOP
BETWEEN VARIOUS MODELS THEIR VARIOUS RUNS. LATEST INDICATIONS ARE
THAT WE WILL SEE A CUT OFF LOW PUSHING ASHORE BY MID WEEK. WITH THIS
FEATURE SHOWING UP IN THE MIDDLE OF A LONG WAVE RIDGE...NO REASON TO
HAVE MUCH CONFIDENCE IN THIS FEATURE AT THIS TIME.

TJADEN

&&

.AVIATION...EXPECT A MIX OF VFR AND MVFR CONDITIONS ALONG THE COAST
THIS AFTERNOON AND TONIGHT AS VISIBILITIES AND CEILINGS ARE REDUCED
DUE TO MODERATE TO HEAVY SHOWERS. A COLD UPPER LOW IS PROVIDING
NUMEROUS SHOWER ACTIVITY ALONG THE COAST AND COASTAL VALLEYS AND
MOUNTAINS. DAYTIME SHOWERS MAY INCLUDE HAIL WHICH WILL LIKELY TURN
INTO HAIL OR SNOW SHOWERS DURING THE LATE NIGHT AND EARLY MORNING
HOURS EVEN ALONG THE IMMEDIATE COAST.  INTERIOR AIR STRIPS WILL SEE
MORE WIDESPREAD VFR CONDITIONS AS LESS CLOUD COVER AND SHOWER
ACTIVITY IS EXPECTED TO PENETRATE INLAND. TONKIN

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY PT ST GEORGE TO PT ARENA OUT 60NM.
SNOW ADVISORY CAZ003 8PM PST TONIGHT TO 12 PM PST THURSDAY.

&&

VISIT US AT WWW.WEATHER.GOV/EUREKA

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
352 PM PST WED JAN 10 2007

CAZ001-002-120000-
REDWOOD COAST-MENDOCINO COAST-
352 PM PST WED JAN 10 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...TONIGHT

A COLD AIR MASS WILL BRING SHOWERS WITH SMALL HAIL AND WET SNOW TO
THE COAST LATE TONIGHT. LITTLE OR NO SNOW ACCUMULATION IS
EXPECTED AT SEA LEVEL...WITH AN INCH OR TWO POSSIBLE OVERNIGHT
ABOVE 500 FEET. SEE SFOSPSEKA FOR DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A COLD AIR MASS WILL BRING SHOWERS WITH SMALL HAIL AND WET SNOW TO
THE COAST THURSDAY. LITTLE ACCUMULATION IS EXPECTED AT SEA LEVEL...
WITH AN INCH OR TWO POSSIBLE ABOVE 200 FEET. SEE SFOSPSEKA FOR
DETAILS.

RECORD LOW TEMPERATURES AND A HARD FREEZE ARE EXPECTED THURSDAY NIGHT
AND FRIDAY NIGHT. SEE SFOSPSEKA FOR DETAILS.

A WARMING TREND WILL BEGIN THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO CALL WITH ANY REPORTS OF SIGNIFICANT
WEATHER.

CAZ003-120000-
NORTH COAST INTERIOR-
352 PM PST WED JAN 10 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...TONIGHT

A SNOW ADVISORY IS IN EFFECT TONIGHT THROUGH NOON THURSDAY. SEE
SFOWSWEKA FOR DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A SNOW ADVISORY IS IN EFFECT THROUGH NOON THURSDAY. COLD AND DRY
CONDITIONS WILL THEN PERSIST THROUGH FRIDAY NIGHT. SEE SFOWSWEKA
AND SFOSPSEKA FOR DETAILS.

A WARMING TREND WILL BEGIN THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO CALL WITH ANY REPORTS OF SIGNIFICANT
WEATHER.

CAZ004-076-120000-
UPPER TRINITY RIVER-MENDOCINO INTERIOR-
352 PM PST WED JAN 10 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...TONIGHT

A COLD AIR MASS WILL BRING VERY LOW SNOW LEVELS TO THE AREA
TONIGHT. SCATTERED TO ISOLATED SHOWERS ACROSS THE AREA WILL BRING
AN INCH OR TWO OF SNOW...ESPECIALLY TO THE HIGHER ELEVATIONS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A COLD AIR MASS WILL BRING LOW SNOW LEVELS THURSDAY...AND DRY BUT
VERY COLD CONDITIONS THAT WILL PERSIST THROUGH FRIDAY NIGHT.

A WARMING TREND WILL BEGIN THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTERS ARE ENCOURAGED TO CALL WITH ANY REPORTS OF SIGNIFICANT
WEATHER.