Special Weather Statement, NWS Eureka, CA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EUREKA CA
351 PM PDT THU APR 12 2012

.SYNOPSIS...
SHOWERS AND ISOLATED THUNDERSTORMS WITH MOUNTAIN
SNOW WILL CONTINUE INTO FRIDAY WITH SOME PARTIAL CLEARING AT THE
COAST POSSIBLE BY THE AFTERNOON. A WARMER AND DRIER WEEKEND IS
STILL EXPECTED BEFORE THE NEXT CHANCE OF RAIN SUNDAY NIGHT INTO
MONDAY.

&&

.DISCUSSION...
RELATIVELY ACTIVE DAY FOR PORTIONS OF THE EKA CWA CONVECTION-WISE
TODAY. SFC LOW OFF THE WA COAST WITH NEG-TILT UPPER LOW DROPPING
SOUTHEASTWARD TOWARD THE N CA COAST HAS PROVIDED US WITH SHOWERS AND
THUNDERSTORMS TRACKING INTO THE COAST FROM THE SSE ALL DAY BUT
SLIGHTLY MORE STABLE AND LESS SHEARED ENVIRONMENT OVER LAND HAS KEPT
THE STRONGER CONVECTION OVER THE OFFSHORE WATERS. ONE OF THE CELLS
ACTUALLY HAD GATE-TO-GATE SHEAR OF 43KTS...PRETTY UNUSUAL FOR THIS
AREA. STORMS MAY BE TAKING ADVANTAGE OF LOCALIZED BACKING WINDS IN
THE BOUNDARY LAYER NEAR CAPE MENDOCINO RESULTING IN GREATER LOW
LEVEL HELICITY VALUES. COASTAL JET WILL WEAKEN THIS EVENING AS LOW
MOVES INLAND RESULTING IN LOW LEVEL FLOW VEERING FROM S TO SW AS THE
LOW MOVES INLAND AND BETTER MID/UPPER DYNAMICS WILL DROP SOUTHWARD
FROM MENDOCINO COUNTY INTO CENTRAL CA TONIGHT. THEREFORE THINK THE
THREAT WILL CONTINUE FOR ANOTHER FEW HOURS FROM SHELTER COVE TO
TRINIDAD THE NEXT SEVERAL HOURS THEN SHIFT SOUTHWARD FOR AWHILE
TONIGHT BEFORE TAPERING OFF AFTER MIDNIGHT AS PROGRESSIVELY DRIER
AIR MOVES IN AND FORCING SHIFTS SOUTH AND EAST. OTHER CONCERN WILL
BE SNOW WITH OUR ONGOING WINTER WX ADVISORY. LIKE THE TIMING ON IT
OVERALL BUT THINK AMOUNTS MAY BE ON THE LOWER SIDE FROM NEAR THE
3000FT LEVEL AS IT HAS JUST BEEN RAIN AT THE PASSES ON 299 THUS FAR.
THAT SHOULD CHANGE TONIGHT AS SNOW LEVELS FALL...BUT SHOWER ACTIVITY
WILL ALSO TEND TO DIMINISH LATER TONIGHT AS WELL. NOT SURE HOW MUCH
THUNDER OR SMALL HAIL THREAT WILL EXIST FRIDAY AS MOISTURE...
DYNAMICS...AND INSTABILITY DIMINISHES. HOWEVER H5 TEMPS WILL STILL
BE QUITE COLD SO THERE MAY BE ENOUGH FOR HAIL OR THUNDER BUT JUST
MORE ISOLATED THAN TODAY OR TONIGHT.

REST OF THE FORECAST IS PRETTY STRAIGHTFORWARD WITH DRY AND WARMER
WEATHER STILL ON TAP FOR THE WEEKEND. NEXT SYSTEM CONTINUES TO SHOW
UP A BIT FASTER IN THE GUIDANCE AND WE MAY NEED SOME SLIGHT/LOW CHC
POPS FOR THE REDWOOD COAST BY SUNDAY AFTERNOON IF THAT TREND
CONTINUES. ANOTHER SYSTEM WILL FOLLOW FOR MIDWEEK BUT BOTH WILL HAVE
LIMITED MOISTURE AND LOOK TO FOCUS MAINLY NORTH OF CAPE MENDO.  AAD

&&

.AVIATION...A COLD UPPER LOW WILL MOVE OVER THE REGION TONIGHT
AND PRODUCE SHOWERS AND ISOLATED TSTMS. LOCALLY HEAVY DOWNPOURS
MAY BRIEFLY PRODUCE MVFR CIGS AND VSBYS.

&&

.MARINE...INSTABILITY ASSOCIATED WITH AN UPPER LEVEL LOW WILL
CONTINUE TO PRODUCE A THREAT FOR WIND GUSTS UP TO 40 KT THIS
EVENING. TSTM ACTIVITY SHOULD DIE DOWN ON FRIDAY AS THE COLD
MASS SLIDES ESE OVER LAND. SEAS HAVE BEEN AROUND 6-9 FT WITH
PERIODS CENTERED NEAR 8 SECONDS. LONG PERIOD WESTERLY SWELL
WILL BUILD TONIGHT...AND THEN PEAK NEAR 13 TO 15 FT ON FRI.
NORTHERLY WINDS SHOULD BEGIN TO RAMP UP ON FRI AND CONTINUE
ON AN UPWARD TREND THROUGH FRI NIGHT. STRONGEST WINDS SHOULD
BE SOUTH OF CAPE MENDOCINO.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...WINTER WEATHER ADVISORY UNTIL 3 PM PDT FRIDAY ABOVE 3000 FEET
     FOR THE CAZ003-004-076.

NORTHWEST CALIFORNIA COASTAL WATERS...
SMALL CRAFT ADVISORY UNTIL 5 PM PDT SATURDAY PZZ450-470.
SMALL CRAFT ADVISORY UNTIL 11 PM PDT SATURDAY PZZ455-475.

&&

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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EUREKA CA
431 AM PDT THU APR 12 2012

CAZ001-002-131145-
REDWOOD COAST-MENDOCINO COAST-
431 AM PDT THU APR 12 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

ISOLATED THUNDERSTORMS WITH SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

ISOLATED THUNDERSTORMS ON FRIDAY.

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

CAZ003-076-131145-
NORTH COAST INTERIOR-MENDOCINO INTERIOR-
431 AM PDT THU APR 12 2012

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 PM PDT FRIDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

A WINTER WEATHER ADVISORY IS CURRENTLY IN EFFECT. FOR FURTHER DETAILS
PLEASE REFER TO NOAA WEATHER RADIO OR WEATHER.GOV/EUREKA.

ISOLATED THUNDERSTORMS WITH SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A WINTER WEATHER ADVISORY IS CURRENTLY IN EFFECT THROUGH FRIDAY
AFTERNOON.

ISOLATED THUNDERSTORMS ON FRIDAY.

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

CAZ004-131145-
UPPER TRINITY RIVER-
431 AM PDT THU APR 12 2012

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 PM PDT FRIDAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT.

A WINTER WEATHER ADVISORY IS CURRENTLY IN EFFECT. FOR FURTHER DETAILS
PLEASE REFER TO NOAA WEATHER RADIO OR WEATHER.GOV/EUREKA.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A WINTER WEATHER ADVISORY IS CURRENTLY IN EFFECT THROUGH FRIDAY
AFTERNOON.

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

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
202 PM PDT THU APR 12 2012

CAZ001>003-122145-
HUMBOLDT CA-MENDOCINO CA-
202 PM PDT THU APR 12 2012

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  EXTREME NORTHWESTERN MENDOCINO COUNTY IN NORTHWEST CALIFORNIA
  SOUTH CENTRAL HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA

UNTIL 245 PM PDT

AT 152 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES SOUTH OF SHELTER COVE...MOVING NORTHEAST
AT 35 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM....ALONG WITH HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
   SHELTER COVE...
   WHITEHORN...
   REDWAY AND  GARBERVILLE...
   MYERS FLAT...
   WEOTT...

LAT...LON 4046 12391 4023 12361 4000 12384 4000 12397
      3995 12389 3990 12394 4001 12405 4002 12409
      4006 12409 4009 12412
TIME...MOT...LOC 2102Z 206DEG 31KT 3995 12406

CARROLL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE
333 PM PDT THU APR 12 2012

CAZ002-122315-
MENDOCINO CA-
333 PM PDT THU APR 12 2012

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  MENDOCINO COUNTY IN NORTHWEST CALIFORNIA

UNTIL 415 PM PDT

AT 326 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES SOUTH OF FORT BRAGG...MOVING NORTHEAST
AT 10 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS
STORM....ALONG WITH HEAVY RAIN.

LAT...LON 3917 12376 3919 12379 3925 12379 3927 12382
      3935 12384 3945 12382 3932 12358 3916 12375
TIME...MOT...LOC 2232Z 206DEG 10KT 3922 12379

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
359 PM PDT THU APR 12 2012

CAZ001-003-122345-
HUMBOLDT CA-
359 PM PDT THU APR 12 2012

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  WEST CENTRAL HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA

UNTIL 445 PM PDT

AT 354 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES NORTHWEST OF PETROLIA AND ANOTHER ONE
12 MILES SOUTH OF PETROLIA...MOVING NORTH AT 25 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE
STORMS.

LOCATIONS IMPACTED INCLUDE...
   FORTUNA...

LAT...LON 4061 12435 4071 12427 4059 12411 4016 12422
      4018 12427 4025 12437 4029 12438 4033 12436
      4034 12438 4038 12438 4043 12442
TIME...MOT...LOC 2258Z 194DEG 23KT 4041 12439

CARROLL