Freeze Warning 2, NWS Eureka, CA

AREA FORECAST DISCUSSION...CORR
NATIONAL WEATHER SERVICE EUREKA CA
332 AM PDT MON MAR 23 2009

.SYNOPSIS...A WEAK PACIFIC STORM SYSTEM WILL BRING THE THREAT FOR
LIGHT PRECIPITATION TO AREAS NORTH OF CAPE MENDOCINO THIS AFTERNOON.
ANOTHER WEAK DISTURBANCE WILL BRING AN OTHER SHOT OF RAIN TO THE
NORTHERN PORTION WEDNESDAY. WARMER AND DRIER WEATHER IS EXPECTED
LATER IN THE WEEK AS HIGH PRESSURE BUILDS ACROSS THE AREA.

&&

.DISCUSSION...LINGERING COLD AIR AND CLEARING SKIES HAVE LOWERED
TEMPERATURES OVERNIGHT WITH A COLD MORNING IN STORE FOR NW CA. WINDS
HAVE CALMED ALONG THE COAST EARLY THIS MORNING AND CONDITIONS ARE
PRIME FOR FROST TO DEVELOP. TEMPERATURES MAY MOMENTARILY DROP BELOW
32 DEGREES FOR THE MENDOCINO COAST...BUT DO NOT THINK THE FREEZE
WARNING CONDITIONS WILL BE LONG LIVED AND DECIDED TO NOT UPGRADE THE
FROST ADVISORY TO A WARNING. AS OF 3 AM PDT...SATELLITE IMAGERY
SHOWS MID AND HIGH CLOUDS ASSOCIATED WITH THE NEXT PACIFIC STORM
ABOUT 50 MILES OFFSHORE OF CRESCENT CITY. THESE CLOUDS WILL BEGIN TO
STREAM OVER DEL NORTE AND HUMBOLDT COUNTIES NEAR SUNRISE AND SHOULD
HINDER FROST CONDITIONS FOR THE REDWOOD COAST TO PERSIST MUCH BEYOND
SUNRISE.

THIS STORM WILL BRING A CHANCE OF LIGHT RAIN MAINLY NORTH OF STATE
ROUTE 36 IN THE LATE MORNING AND AFTERNOON. A RAPID INCREASE OF HIGH
PRESSURE YESTERDAY AND OVERNIGHT HAS BROUGHT DRIER CONDITIONS
ACROSS THE REGION...WHICH MAY HELP TO LIMIT THE AMOUNT OF
PRECIPITATION ACTUALLY REACHING THE SURFACE. DYNAMICS ARE WEAK WITH
THIS SYSTEM AND DO NOT ANTICIPATE MUCH RAINFALL FOR HUMBOLDT AND
TRINITY COUNTIES. ISENTROPIC ANALYSIS ON A 290 K SURFACE REVEALS THE
BEST CHANCE FOR LIFT OVER SOUTHERN OREGON AND CONFIDENCE IS HIGHER
THAT MEASURABLE RAIN WILL FALL OVER DEL NORTE COUNTY. EXPECTED
RAINFALL TOTALS FOR DEL NORTE COUNTY ARE BETWEEN 0.25 AND 0.50
INCH.  RAINFALL BETWEEN 0.10 AND 0.25 INCH CAN BE EXPECTED
NORTH OF HIGHWAY 299...AND LESS THAN 0.10 INCH BETWEEN HIGHWAY 299
AND SR 36. THE BULK OF THE PRECIPITATION IS EXPECTED IN THE
AFTERNOON AND SNOW LEVELS SHOULD RISE BEFORE THE PRECIPITATION
REACHES LAND. HOWEVER...SNOW LEVELS COULD BE A CONCERN IF THE
PRECIPITATION STARTS EARLY.

ANOTHER WEAK DISTURBANCE WILL BRING ANOTHER CHANCE OF RAIN TO THE
NORTHERN PORTION OF THE FORECAST AREA WED. HIGH PRESSURE OVER THE NE
PACIFIC WILL PUSH EAST AND SHOVE THE STORM TRACK NORTHWARD LATE IN
THE WEEK...WITH OFFSHORE FLOW POSSIBLY DEVELOPING BY THE WEEKEND. TH

&&

.AVIATION...CLEARING/DRYING AND WIDESPREAD VFR CONDITIONS IN THE
WAKE OF A COLD FRONT WILL GIVE WAY TO ANOTHER ROUND OF MOSTLY LIGHT
RAIN AND MVFR CONDITIONS THIS AFTERNOON AND EVENING. DJB

&&

.MARINE...PRESSURE GRADIENTS WILL RELAX TODAY AS A FRONT APPROACHES
THE PAC NW. WINDS WILL BE MOSTLY LIGHT THROUGH TONIGHT...EXCEPT
SOUTH OF CAPE MENDOCINO WHERE LOCALIZED NORTH WINDS WILL GUST TO
AROUND 25 KT THROUGH THIS EVENING. NORTH WINDS WILL RAMP UP TO 25-30
KT SOUTH OF THE CAPE ON TUE AS HIGH PRESSURE BUILDS BEHIND THE
FRONT. DJB

.EKA WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY FOR ALL WATERS
FROST ADVISORY FOR THE COAST UNTIL 9 AM PDT.

&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
148 PM PDT SUN MAR 22 2009

CAZ001-002-232100-
REDWOOD COAST-MENDOCINO COAST-
148 PM PDT SUN MAR 22 2009

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
MONDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FROST ADVISORY IS IN EFFECT FROM MIDNIGHT PDT TONIGHT TO 9 AM
PDT MONDAY. MORE INFORMATION CAN BE FOUND AT AWIPS PRODUCT
/SFONPWEKA/ OR WMO HEADER /WWUS76 KEKA/.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THE FROST ADVISORY EXPIRES AT 9 AM PDT MONDAY.

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