Frost Advisory 4, NWS Eureka, CA

000 
WWUS76 KEKA 110932
NPWEKA

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
232 AM PDT WED MAR 11 2009

CAZ001-002-111700-
/O.CON.KEKA.FR.Y.0004.090311T1000Z-090311T1700Z/
REDWOOD COAST-MENDOCINO COAST-
232 AM PDT WED MAR 11 2009

...FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT THIS
MORNING...

A FROST ADVISORY REMAINS IN EFFECT UNTIL 10 AM PDT THIS MORNING. 

TEMPERATURES WILL REMAIN IN THE LOW TO MID 30S ALONG THE COAST
EARLY THIS MORNING UNDER MOSTLY CLEAR SKIES AND LIGHT WINDS.
AREAS OF FROST WILL PERSIST IN LOW LYING AREAS AND MAY HARM
SENSITIVE EARLY SPRING VEGETATION DURING THE MORNING HOURS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS POSSIBLE. SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
356 AM PDT TUE MAR 10 2009

.SYNOPSIS...HIGH PRESSURE WILL BRING WARMER DAYTIME TEMPERATURES
AND DRIER WEATHER TO THE REGION THROUGH FRIDAY. CONTINUING NEAR
RECORD LOW NIGHTTIME TEMPERATURES ARE EXPECTED THROUGH MID WEEK.

&&

.DISCUSSION...WEAK VORT MAX OFFSHORE AROUND 40N 130W AND A TROUGH
OVER THE PAC NW ARE THE LIKELY CULPRIT IN KEEPING THE OPEN CELL
CUMULUS GOING OVER THE WATERS AND INTO THE IMMEDIATE COAST
OVERNIGHT. OCCASIONAL SHOWERS HAVE CONTINUE TO REGENERATE OVER THE
WATERS...WITH A FEW REACHING THE REDWOOD COAST THIS MORNING. HAVE
INCLUDING THE POSSIBILITY OF ISOLATED SHOWERS IN THE FORECAST FOR
THE FIRST PART OF THE MORNING BASED ON THE CURRENT RADAR/SATELLITE
TRENDS. WEAK OFFSHORE FLOW HAS GENERALLY KEPT THE SKIES PARTLY
CLOUDY TO CLEAR AND ALLOWED TEMPERATURES TO DROP TO NEAR OR BELOW
FREEZING ALONG THE COASTS.

THE TWO TROUGHS WILL MERGE OVER THE REGION LATER TONIGHT...BUT THE
ONLY EFFECT WILL BE THE CONTINUATION OF OCCASIONAL PASSING CLOUDS.
ONCE THESE MOVE THROUGH TOMORROW AFTERNOON THE A STRONGER RIDGE
WILL BUILD IN ALOFT THROUGH FRIDAY WITH DRY WEATHER AND MUCH
WARMER TEMPERATURES.

THE OPERATIONAL GFS...ITS ENSEMBLE MEMBERS AND ECMWF HAVE BETTER
COME INTO LINE WITH THE DEPICTION OF THE WEEKEND TROUGH DROPPING
OUT OF THE GULF OF ALASKA. ECMWF IS STILL SLIGHTLY SLOWER IN THE
PASSAGE OF THE 500 MB TROUGH...BUT STILL BRINGS PRECIP INTO THE
REGION SATURDAY AFTERNOON THROUGH SUNDAY AFTERNOON. CONFIDENCE
INTO EARLY NEXT WEEK IS LOW AS MODELS ALL DIFFER SLIGHTLY IN
SETTING UP A QUASI-STATIONARY WARM FRONTAL BOUNDARY SOMEWHERE TO
OUR NORTH. IF OR WHERE THIS SETS UP WILL PROBABLY TAKE A FEW MORE
MODEL RUNS TO RESOLVE. FOR NOW...HAVE GONE WITH THE CONSENSUS AND
DROPPED THE REGION BELOW CLIMO FOR POPS AS THE BOUNDARY REMAINS
MORE OVER THE OR/WA BORDER. ALM

&&

.AVIATION...VFR CONDITIONS WILL PREVAIL THROUGH THE FCST.
ALSO...SOME PATCHY FG/FROST WILL EFFECT COASTAL LOCATIONS AND
INTERIOR VALLEYS EARLY THIS MORNING AND AGAIN OVERNIGHT INTO WED. BC

&&

.MARINE...HIGH PRESSURE BUILDING INTO THE NE PAC WILL COMBINE WITH
LOW PRESSURE OVER THE GREAT BASIN...MAINTAINING BREEZY NORTH WINDS
TO THE WATERS...MAINLY OVER THE OUTER WATERS. NW SWELL WILL DIMINISH
SLIGHTLY TODAY AND A LONGER PERIOD W SWELL WILL MOVE INTO THE WATERS
RESULTING IN MIXED SWELL CONDITIONS THAT WILL PERSIST THROUGH THE
MIDDLE OF THE WEEK. BC

&&

.CLIMATE...COLD AIR ACROSS THE REGION WILL BRING RECORD OR NEAR
RECORD LOW TEMPERATURES THIS MORNING AND TONIGHT.

SITE...............TUES 10 MAR........WED 11 MAR
                    RECORD          RECORD/FORECAST

CRESCENT CITY..........31................30/34
KLAMATH................28................33/36
ORICK..................27................28/36
EUREKA.................30................30/33
WILLOW CREEK...........28................28/31
FORT BRAGG.............30................30/29
WILLITS................26................25/24
UKIAH..................31................32/30

&&

.EKA WATCHES/WARNINGS/ADVISORIES...

FREEZE WARNING UNTIL 10 AM PDT THIS MORNING FOR CAZ001-002.

SMALL CRAFT ADVISORY FOR WINDS AND HAZARDOUS SEAS FROM PT ST GEORGE
TO CAPE MENDOCINO 10-60 NM AND FROM CAPE MENDOCINO TO PT ARENA OUT
60 NM.

&&

VISIT US AT HTTP://WWW.WEATHER.GOV/EUREKA

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
1053 PM PDT MON MAR 9 2009

CAZ001-002-110000-
REDWOOD COAST-MENDOCINO COAST-
1053 PM PDT MON MAR 9 2009

...FREEZE WARNING IN EFFECT UNTIL 10 AM PDT TUESDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...TONIGHT

A FREEZE WARNING IS IN EFFECT FROM 1 AM PDT TO 10 AM PDT. SEE
AWIPS PRODUCT /SFONPWEKA/ OR WMO HEADER /WWUS76 KEKA/ FOR MORE
INFORMATION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THE FREEZE WARNING EXPIRES AT 10 AM PDT.

.SPOTTER INFORMATION STATEMENT...SPOTTERS ARE ENCOURAGED TO REPORT
SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE IN EUREKA.