Wind Chill Advisory 5, NWS Miami, FL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
124 PM EST MON DEC 28 2009

...WIND CHILL ADVISORY FOR GLADES COUNTY WITH SOME 30S ELSEWHERE IN
THE NORTH AND SOUTHWEST PORTIONS OF SOUTH FLORIDA...

.DISCUSSION...A COLD FRONT MOVED THROUGH SOUTH FLORIDA TODAY
BRINGING A DRIER AND COOLER AIRMASS TO THE CWA. MIN TEMPS ARE
EXPECTED TO REMAIN IN THE MID TO UPPER 40S ACROSS METRO AREAS AND
IN THE MID 30S ACROSS INLAND AREAS TONIGHT. NORTHWESTERLY FLOW AT
AROUND 8 KNOTS WILL LEAD TO WIND CHILLS IN THE MID 30S ACROSS
INTERIOR AND IN THE UPPER 30S ACROSS NORTHERN METRO AREAS. A WIND
CHILL ADVISORY IS ACTIVE FOR GLADES COUNTY FOR TOMORROW MORNING AS
THE TEMPERATURES FALL AOB 35 DEGREES FOR AT LEAST 4 HOURS. PORTIONS
OF WESTERN PALM BEACH COUNTY AND EASTERN COLLIER COUNTY COULD ALSO
EXPERIENCE THESE WIND CHILLS BUT FOR A COUPLE OF HOURS OR SO. AS THE
NIGHT PROGRESSES...A SFC HIGH PRESSURE WILL BUILD ACROSS THE
SOUTHERN PLAINS AND MOVE EASTWARD ACROSS SOUTHEASTERN PORTIONS OF
THE CONUS. AS THIS FEATURE APPROACHES...THE WIND FLOW WILL SHIFT
FROM NORTHERLY TO THE EASTERLY BY MID WEEK...WHICH WILL ALSO WARM UP
THE TEMPS A LITTLE ESPECIALLY ALONG THE EAST COAST.

IN THE EXTENDED...THERE IS ANOTHER COLD FRONT EXPECTED TO MOVE
ACROSS THE AREA BY THE END OF THE WEEK...WHICH MIGHT BRING THE FIRST
FREEZE OF THE SEASON ACROSS INTERIOR AREAS THIS WEEKEND. LITTLE
MOISTURE IS EXPECTED TO MOVE ACROSS THE AREA AHEAD OF THE FRONT.

&&
.MARINE...
COMBINED SEAS AND WIND CRITERIA FOR SCA IS EXPECTED FOR THE ATLANTIC
WATERS STARTING TONIGHT AT 00Z UNTIL EARLY WEDNESDAY. SEAS ARE
EXPECTED TO BUILD UP TO 9 FT ACROSS THE OFFSHORE WATERS WITH WINDS
FROM 15 TO 20 KTS. THE GULF WATERS WILL REMAIN UNDER SCEC AT LEAST
THROUGH THE NIGHT DUE TO WINDS.

&&

.FIRE WEATHER...
WILL KEEP THE FIRE WEATHER WATCH FOR THE WESTERN INTERIOR FOR
TOMORROW AS BORDERLINE WARNING CRITERIA CONDITIONS ARE EXPECTED...IE
RHS BELOW 35 PERCENT FOR 3-4 HRS CERTAINLY APPEARS PSBL. MODEL
SOUNDINGS SHOW LOWER DEWPTS THAN GUIDANCE CURRENTLY IN PLACE. THIS
LEADS TO RH VALUES AROUND IN THE MID 30S FOR AT LEAST COUPLE OF
HOURS. PLEASE KEEP MONITORING LATEST FCSTS ISSUED FOR UPDATES ON
THIS THINKING. MOISTURE RECOVERY WILL OCCUR REGION WIDE ON WEDNESDAY
WITH NO CONCERNS AT THIS TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH  45  67  54  74 / 0 0 - 10
FORT LAUDERDALE  49  68  58  75 / 0 0 - 10
MIAMI            50  68  58  75 / 0 0 - 10
NAPLES           45  64  47  75 / 0 0 - 10

&&

.MFL WATCHES/WARNINGS/ADVISORIES...
FL...FIRE WEATHER WATCH TUESDAY AFTERNOON FOR FLZ063-FLZ066-FLZ069-
     FLZ070.
     WIND CHILL ADVISORY GLADES COUNTY FROM 29/9Z UNTIL 29/14Z.

AM...SMALL CRAFT ADVISORY FOR ATLANTIC ZONES FROM 29/00Z THROUGH
EARLY WEDNESDAY FOR AMZ650-651-670-671.

GM...NONE.
&&

DISCUSSION/MARINE/FIRE WX...15/JR-17/ERA
AVIATION...04/AT

HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA
NATIONAL WEATHER SERVICE MIAMI FL
543 AM EST MON DEC 28 2009

FLZ063-066>075-168-172>174-291100-
GLADES-HENDRY-INLAND PALM BEACH-METRO PALM BEACH-COASTAL COLLIER-
INLAND COLLIER-INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-
METRO MIAMI DADE-MAINLAND MONROE-COASTAL PALM BEACH-
COASTAL BROWARD-COASTAL MIAMI DADE-FAR SOUTH MIAMI DADE-
543 AM EST MON DEC 28 2009

...STRONG COLD FRONT TO BRING COLD TEMPERATURES REGION-WIDE TONIGHT...
...INCREASINGLY HAZARDOUS MARINE CONDITIONS BEGINNING LATER TODAY...
...MODERATE RISK OF RIP CURRENTS PALM BEACH COAST...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY AND TONIGHT

RIP CURRENTS: A NORTHEAST SWELL OF 3 TO 4 FEET WILL LEAD TO A
MODERATE THREAT FOR RIP CURRENTS ALONG THE PALM BEACH COUNTY
COAST, DESPITE NORTHWESTERLY OFFSHORE WINDS.

TEMPERATURES: A STRONG COLD FRONT WILL SWEEP ACROSS SOUTH FLORIDA
LATER THIS MORNING, WITH THE COMBINATION OF COLD TEMPERATURES
AND PERSISTENT NORTHWESTERLY WINDS ALLOWING WIND CHILL VALUES TO
BE A CONCERN FOR ALL OF SOUTH FLORIDA TONIGHT. WIND CHILLS WILL
RANGE FROM 30 TO 35 DEGREES IN THE REGION AROUND LAKE OKEECHOBEE,
TO 35 TO 45 DEGREES ACROSS THE REMAINDER OF MAINLAND SOUTH
FLORIDA, WITH THE EXCEPTION OF COASTAL MIAMI-DADE COUNTY.

WAVES: THE COMBINATION OF A 3 TO 4 FOOT NORTHEAST SWELL, AND
NORTHWEST WINDS OF 15 TO 20 KNOTS, WILL ALLOW SEAS IN THE GULF
STREAM OFF THE COAST OF PALM BEACH COUNTY TO RISE TO 6 FEET LATER
TODAY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

MINIMUM APPARENT TEMPERATURES BELOW 45 DEGREES CAN BE EXPECTED
ONCE AGAIN ACROSS PORTIONS OF THE GULF COAST AND NORTHWEST
INTERIOR ONCE AGAIN ON WEDNESDAY MORNING. HOWEVER, ANOTHER
STRONGER SURGE OF COLD AIR IS EXPECTED THIS WEEKEND, WITH WIND
CHILL VALUES BELOW 45 EXPECTED FOR ALL OF MAINLAND SOUTH FLORIDA
ON SATURDAY, SUNDAY, AND MONDAY MORNINGS.

OTHERWISE, A MODERATE NORTHEAST SWELL WILL PERSIST IN THE ATLANTIC
WATERS THROUGH THE END OF THE WEEK, WHICH COMBINED WITH
INCREASING ONSHORE FLOW ON WEDNESDAY, WILL LEAD TO A HEIGHTENED
THREAT FOR RIP CURRENTS, ESPECIALLY ALONG THE PALM BEACH COAST.
STRONG NORTHWEST WINDS ARE EXPECTED FOR SEVERAL DAYS BEGINNING
LATE THIS WEEK, WHICH WILL LEAD TO A PROLONGED PERIOD OF ROUGH AND
HAZARDOUS CONDITIONS ON THE LOCAL WATERS BEGINNING FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

FOR MORE INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN MIAMI
WEBSITE AT WWW.WEATHER.GOV/MIAMI.

DD/CWC