Special Weather Statement, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
210 PM PDT WED JUNE 03 2009

SYNOPSIS...AN AREA OF LOW PRESSURE ALONG THE WEST COAST WILL
CONTINUE TO PRODUCE SHOWERS AND ISOLATED THUNDERSTORMS TO NORTHWEST
CALIFORNIA THROUGH THE END OF THE WEEK.
&&

.SHORT TERM...TONIGHT THROUGH SATURDAY...SATELLITE AND RADAR IMAGERY
SHOW CONVECTION DEVELOPING THIS AFTERNOON. EXPECT SCT SHRA AND ISOLD
TSTMS TO CONTINUE TO DEVELOP OVER THE REGION AND PROPAGATE TO THE NW
ACROSS THE CWA AS QUASI STATIONARY UPPER LOW REMAINS OFF THE COAST.
STABILITY INDICES SHOW SLIGHT POTENTIAL FOR LARGE HAIL AND DAMAGING
WINDS WITH STORMS THIS AFTERNOON...SO WILL CONTINUE TO MONITOR RADAR
TRENDS THROUGH THIS EVENING. EXPECT CONVECTION TO PEAK BY EARLY THIS
EVENING AS A MINOR SHORT WAVE ROTATES AROUND THE PARENT LOW WITH
SHOWERS CONTINUING THROUGH THE NIGHT IN THE UNSTABLE ATMOSPHERE. A
SERIES OF VORT MAXES WILL ROTATE AROUND THE LOW AND COMBINE WITH A
RELATIVELY DEEP MOIST LAYER TO CONTINUE THE THREAT OF CONVECTION
THU. MODELS IN GOOD AGREEMENT ON UPPER LOW DRIFTING ONSHORE FRI WITH
AFTERNOON CONVECTION EXPECTED AGAIN. THE THREAT FOR TSTMS WILL
DIMINISH SAT AS THE UPPER LOW MOVES E OF THE REGION. BC

&&

.LONG TERM (SATURDAY NIGHT THROUGH WEDNESDAY)...THE MEDIUM RANGE
MODELS CONTINUE TO SHOW SOME CHANGES IN HOW THE UPPER LOW IS HANDLED
THROUGH THE INITIAL PART OF THE EXTENDED. HOWEVER THE GENERAL IDEA
OF MOVING THE LOW ONSHORE AND DEVELOPING SPLIT FLOW ALOFT IS
MAINTAINED. THE LATEST ITERATION BRINGS THE LOW ONSHORE SOUTH OF
POINT CONCEPTION EARLY SATURDAY EVENING...AND INLAND ACROSS LAS
VEGAS BY 12Z SUNDAY. THE SOUTHERN BRANCH OF THE SPLIT FLOW PUSHES A
LOW WEST TO THE OFFSHORE WATERS EARLY NEXT WEEK. NORTHERN CALIFORNIA
WILL REMAIN IN LIGHT NORTHERLY FLOW WITH LINGERING MOISTURE THROUGH
MONDAY...WITH A WEAK SHORTWAVE FORECAST BY THE GFS TO BRUSH THE CWA
LATE MONDAY INTO TUESDAY...FOLLOWED BY A SIMILAR WEAK SYSTEM EARLY
WEDNESDAY. CILIBERTI

&&

.MARINE...LIGHT WINDS AND LOW SEAS WILL PREVAIL THROUGH THE WEEK.
THE SEAS WILL CONTAIN A MIX OF SHORT PERIOD NW SWELL AND LONG PERIOD
SOUTH TO SW SWELL...WITH SIG WAVE HEIGHTS NEAR 3 FEET. ISOLATED
THUNDERSTORMS WILL PERSIST THROUGH FRIDAY...BRINGING OCCASIONAL
CLOUD-TO-WATER LIGHTNING STRIKES...HEAVY RAIN...HAIL AND SUDDEN
BURSTS OF WIND.

&&

.AVIATION...CONTINUED ADVECTION OF MOIST AIR AND
INSTABILITY...ASSOCIATED WITH A LOW PRESSURE SYSTEM CENTERED OFF THE
CENTRAL COAST...WILL PRODUCE SHOWERS AND THE THREAT OF THUNDERSTORMS
ACROSS THE REGION. THE STORMS MAY PRODUCE HAIL...HEAVY RAIN AS WELL
AS STRONG AND ABRUPT WINDS. THESE ARE STANDARD FLIGHT HAZARDS
ASSOCIATED WITH CONVECTION...AND ARE THE PRIMARY RISK TO AVIATION.
AS TYPICAL...POCKETS OF IFR TO MVFR CONDITIONS WILL CONTINUE ALONG
THE COASTAL STRIP. ASHFORD

&&

.EKA WATCHES/WARNINGS/ADVISORIES...

NONE.

&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
518 AM PDT WED JUN 3 2009

CAZ001>004-076-041230-
REDWOOD COAST-MENDOCINO COAST-NORTH COAST INTERIOR-
UPPER TRINITY RIVER-MENDOCINO INTERIOR-
518 AM PDT WED JUN 3 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA
TODAY AND TONIGHT. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL
...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF
THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF
ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA
THROUGH THURSDAY. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL
...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF
THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF
ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS SUCH AS LIGHTNING...STRONG WINDS...HAIL OR FLOODING TO
THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
247 PM PDT WED JUN 3 2009

CAZ003-004-032230-
TRINITY CA-HUMBOLDT CA-
247 PM PDT WED JUN 3 2009

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHEASTERN HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA
  SOUTHWESTERN TRINITY COUNTY IN NORTHWEST CALIFORNIA

UNTIL 330 PM PDT

AT 245 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 6 MILES SOUTHEAST OF RUTH..MOVING NORTHWEST AT 10
MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
   RUTH...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4035 12365 4050 12339 4020 12316 4009 12335
TIME...MOT...LOC 2147Z 145DEG 11KT 4022 12333

BC