Severe Thunderstorm Warning 17, NWS Miami, FL

000
WWUS52 KMFL 021858
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
258 PM EDT WED APR 2 2008

FLC051-021930-
/O.CON.KMFL.SV.W.0017.000000T0000Z-080402T1930Z/
HENDRY FL-
258 PM EDT WED APR 2 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTH CENTRAL HENDRY COUNTY...

AT 255 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR MONTURA...MOVING NORTHWEST AT 12 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...

  RURAL NORTHERN HENDRY COUNTY

AND SURROUNDING COMMUNITIES.

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 60
MPH...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY
INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 2670 8125 2677 8113 2673 8095 2655 8100
TIME...MOT...LOC 1858Z 134DEG 11KT 2670 8108

$$

KOB

000
WWUS52 KMFL 021921
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
321 PM EDT WED APR 2 2008

FLC051-021931-
/O.EXP.KMFL.SV.W.0017.000000T0000Z-080402T1930Z/
HENDRY FL-
321 PM EDT WED APR 2 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL HENDRY COUNTY
WILL EXPIRE AT 330 PM EDT...

THUNDERSTORMS CONTINUE TO DEVELOP ACROSS NORTHERN HENDRY COUNTY AND 
MOVE TO THE NORTHWEST AT 15 MPH. FREQUENT LIGHTNING...GUSTY WINDS TO 
40 MPH...VERY HEAVY RAINFALL AND SMALL HAIL ARE STILL POSSIBLE. STAY 
TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST UPDATES.

LAT...LON 2670 8125 2677 8113 2673 8095 2655 8100
TIME...MOT...LOC 1921Z 134DEG 11KT 2675 8114

$$

KOB

AREA FORECAST DISCUSSION...UPDATED FOR AVIATION SECTION
NATIONAL WEATHER SERVICE MIAMI FL
932 AM EDT WED APR 2 2008

...ACTIVE WEATHER DAY EXPECTED WITH THUNDERSTORMS DEVELOPING AND
BECOMING FOCUSED INTERIOR/GULF COAST WITH A FEW SEVERE STORMS
POSSIBLE ALONG WITH LOCALLY HEAVY RAINFALL...

.UPDATE...THE ATMOSPHERE IS EXTREMELY UNSTABLE THIS MORNING WITH VERY
STEEP MID LEVEL LAPSE RATES. THE 500 MB TEMP IS -13.5 AND WITH
WARM LOW LEVELS...WE END UP WITH A VERTICAL TOTALS OF 28.0...QUITE
IMPRESSIVE. THE PWAT ON THE MIAMI SOUNDING IS 1.37...EXACTLY THE
SAME AS YESTERDAY...AND DEFINITELY MOIST ENOUGH TO GET HEAVY
RAINFALL...CASE IN POINT...WHAT HAPPENED YESTERDAY. ALSO...AT
MID/UPPER LEVELS THE LOCAL AREA IS IN A COL WHICH COULD PROVIDE
FOR UPPER DIVERGENCE TODAY. NAM-WRF PERFORMED EXCELLENT YESTERDAY
AND AGAIN IS SHOWING A STRONG CONVECTIVE SIGNAL FOCUSED ALONG THE
GULF COAST/NAPLES AREA WITH QPF OF AROUND 3 INCHES THERE...AS
CONVECTION FOCUSES ALONG GULF/LAKE BREEZES. THERE IS A BOUNDARY
ACROSS THE LAKE OKEE REGION AS WELL SEPARATING MOIST LOW LEVEL AIR
WITH DRIER AIR OVER CENTRAL FL...AND THIS TOO COULD PROVIDE A
FOCUS FOR CONVECTION.

GIVEN THE AFOREMENTIONED FACTORS...WILL BE UPDATING THE FCST TO
INCREASE POPS TO LIKELY INTERIOR/GULF COAST AND ADD SEVERE TSTORM
POSSIBILITIES ALONG WITH LOCALLY HEAVY RAINFALL THERE. LARGE HAIL
LOOKS TO BE THE PRIMARY THREAT...GIVEN THE COLD AIR
ALOFT...EXCELLENT CAPE AROUND 3000 J/KG AND VERY STEEP LAPSE RATES
IN THE HAIL GROWTH LAYER. ONLY THING MISSING IS SHEAR...BUT OTHER
FACTORS POINT TO LARGE HAIL POSSIBILITIES. UPDATED FCST WILL BE
OUT SHORTLY. /GREGORIA

&&

.AVIATION...AN E/SE WIND FLOW THROUGH THE PERIOD WITH SCT SHRA/TSRA
DEVELOPING ALONG THE E CST THIS MORNING AND THEN MOVING AWAY FROM
THE TERMINALS. STRONG CONVECTION LIKELY TO DEVELOP INTERIOR S FLA BY
LATE THIS MORNING/EARLY AFTERNOON HOURS AS THEY CONTINUE TO MOVE
NORTHWEST. THIS WILL AFFECT KAPF AND MAY HAVE TO ADD TEMPO GROUP TO
THEIR TAF FOR POSSIBLE LOW CIG/VSBY IN TSRA AND ALSO THE POSSIBILITY
OF STRONG SFC GUSTS. THIS ACTIVITY WILL THEN DIMINISH AFT 00Z.

&&

.PREV DISCUSSION... /ISSUED 326 AM EDT WED APR 2 2008/

SYNOPSIS...MID TO UPR LVL SHORT WAVE TROUGH CURRENTLY (04Z) ACROSS
S. FL. SFC ATLC HIGH PRESS RIDGE EXTENDING WEST ALONG 30N WITH
LIGHT TO MODERATE SE FLOW ADVECTING MOISTURE ACROSS S. FL. WEAK
FRONTAL BOUNDARY ACROSS SE U.S. TO SE TX.

SHORT TERM...TODAY THROUGH THURSDAY...AS THE SHORT WAVE TROUGH
MOVES EAST, THE FLOW WILL BECOME DIVERGENT ALOFT. THIS, COUPLED
WITH DIURNAL HEATING, ABUNDANT MOISTURE AND LOCAL SEA/LAKE BREEZES
WILL LIKELY LEAD TO SCT SHWRS/ISOLD TSTMS ACROSS S.FL BOTH, THIS
AFTERNOON AND THURSDAY AFTERNOON. WL EXPECT MOST AFTERNOON
CONVECTION TO BE ACROSS INTERIOR SECTIONS AND VCNTY LAKE
OKEECHOBEE. HIGH PWAT VALUES AND RELATIVELY SLOW MOVEMENT OF
SHWRS/TSTMS COULD RESULT IN LOCALLY HEAVY RAIN OVER THESE AREAS.
WEAK FRONTAL BOUNDARY OVER SE U.S. WILL CRAWL SE TO NRN FLORIDA
THROUGH THIS PERIOD HOWEVER, THE ATLC RIDGE BUILDING WWD WILL HALT
ITS MOVEMENT PREVENTING IT FROM ADVANCING FURTHER.

FRIDAY THROUGH MONDAY...A MORE VIGOROUS UPPER TROUGH WL MOVE FROM
THE PACIFIC COAST TO S. CENTRAL PLAINS BY FRI AND WILL PUSH A
CDFNT TO FL PANHANDLE BY SAT. BY SUNDAY THE FLOW ALOFT BECOMES
MORE ZONAL AND SO THE CDFNT LOOSES THE UPPER LVL SUPPORT AS THE
ENERGY IS TRANSFERED NEWD. THIS WILL LEAVE THE FRONT HANGING ACROSS
CENTRAL FLORIDA JUST NOR TH OF LAKE OKEECHOBEE. THE NEARNESS OF
THIS BOUNDARY, A SERIES OF WEAK UPPER LVL DISTURBANCES AND LOCAL
EFFECT WILL LIKELY KEEP S. FL UNDER A CHANCE FOR SHOWERS/SLIGHT
CHANCE OF TSTMS THROUGH THIS PERIOD.

LONG TERM...TUESDAY THROUGH WEDNESDAY...A DEVELOPING LONG WAVE
RIDGE UPSTREAM WILL RESULT IN SUBSIDENCE INCREASING AND A SLIGHT
DECREASE IN THE CHANCES OF RAIN.

AVIATION...AN E/SE WIND...GENERALLY BLO 15 KTS... EXPECTED TO
CONTINUE ACROSS S FL THRU THE PD. KAPF MORE SOUTHERLY AFT 17Z AS SEA
BREEZE ATTEMPTS TO DVLP. ALL TERMINALS MOSTLY VFR CONDITIONS. ISOLD
SHRA WILL AFFECT E COAST TERMINALS THRU 14Z WITH BRIEF MVFR CIG/VSBY
AND AFT 17Z WITH SHRA/TSRA VCNTY...BUT MOVG INLD BY 20Z. KAPF MAY
EXPERIENCE MVFR CIG/VSBY 17Z-00Z WITH VCTS.

MARINE...FAIRLY TRANQUIL MARINE CONDITIONS WITH WINDS AOB 15 KTS
AND SEAS AOB 4 FEET SHOULD PREVAIL THROUGH TONIGHT. A BRIEF
INCREASE IN THE WINDS TO 20 KTS WILL RESULT IN SEAS BUILDING TO 6
FEET ACROSS THE ATLC WATERS THU THROUGH FRIDAY. BUOY 41114 HAS
BEEN INDICATING A 2 TO 3 FT NE SWELL THIS MORNING AND WILL EXPECT
THIS SWELL TO CONTINUE TO AFFECT NRN PORTIONS OF PALM BEACH COUNTY
COAST THROUGH THIS MORNING AND EARLY AFTERNOON. THIS WILL INCREASE
THE RISK OF RIP CURRENTS ALONG THE ATLC BEACHES OF PALM BEACH
COUNTY THROUGH THIS AFTERNOON...ESPECIALLY NEAR THE TIME OF LOW TIDE.

FIRE WEATHER...NO PROBLEMS EXPECTED AT THIS TIME.

&&

.MFL WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
AM...NONE.
GM...NONE.
&&

HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA
NATIONAL WEATHER SERVICE MIAMI FL
859 AM EDT WED APR 2 2008

FLZ063-066>075-168-172>174-030030-
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-
855 AM EDT WED APR 2 2008

...A FEW SEVERE THUNDERSTORMS EXPECTED MAINLY INTERIOR AND WEST COAST...
...HIGH RISK OF RIP CURRENTS PALM BEACH COUNTY BEACHES...
...MODERATE RISK OF RIP CURRENTS BROWARD AND MIAMI-DADE BEACHES...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY AND TONIGHT

RIP CURRENTS: EAST WINDS OF 10 TO 15 KNOTS, LOW TIDE AROUND NOON
AND A NORTHEAST SWELL OF 2 TO 3 FEET OFF OF PALM BEACH COUNTY,
HAVE COMBINED FOR A HIGH RISK OF RIP CURRENTS AT THE BEACHES OF
PALM BEACH COUNTY, AND A MODERATE RISK OF RIP CURRENTS AT THE
BEACHES OF BROWARD AND MIAMI-DADE COUNTIES.

THUNDERSTORMS: SCATTERED TO NUMEROUS THUNDERSTORMS CAN BE
EXPECTED TODAY MAINLY INTERIOR AND WESTERN SECTIONS OF SOUTH
FLORIDA. FREQUENT LIGHTNING, LOCALLY HEAVY RAINFALL, LARGE HAIL AND
STRONG DAMAGING GUSTY WINDS TO 60 MPH ARE POSSIBLE.

WIND: SOME OF THE STRONGEST THUNDERSTORMS MAY PRODUCE WIND GUSTS
TO 60 MPH.

HAIL: HAIL AT LEAST TO QUARTER SIZE MAY OCCUR WITH THE STRONGEST
THUNDERSTORMS.

FLOODING: THE SLOW MOVEMENT OF THE THUNDERSTORMS MAY PROCUCE
LOCALLY HEAVY RAINFALL THAT COULD FLOOD LOW LYING AND FLOOD PRONE
AREAS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE THREAT OF RIP CURRENTS AT THE ATLANTIC BEACHES WILL PERSIST
THROUGH THE REMAINDER OF THE WEEK.

SOME THUNDERSTORMS CAN BE EXPECTED AGAIN AROUND THE LAKE
OKEECHOBEE REGION THURSDAY AND FRIDAY AND THEN ACROSS ALL OF SOUTH
FLORIDA SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED BY THIS AFTERNOON.

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

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
102 PM EDT WED APR 2 2008

FLZ063-066-069-070-075-021830-
HENDRY FL-GLADES FL-MAINLAND MONROE FL-COASTAL COLLIER COUNTY FL-
INLAND COLLIER COUNTY FL-
102 PM EDT WED APR 2 2008

...ISOLATED SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON...

A VERY UNSTABLE ATMOSPHERE IS CURRENTLY IN PLACE ACROSS THE
AREA...WITH VERY COLD AIR PRESENT IN THE MIDDLE TO UPPER LEVELS OF
THE ATMOSPHERE. THUNDERSTORMS ARE NOW DEVELOPING OVER INTERIOR SOUTH
FLORIDA. THESE STORMS WILL MOVE WESTWARD INTO
GLADES...HENDRY...COLLIER...AND MAINLAND MONROE COUNTIES THROUGH THE
AFTERNOON HOURS. THE STORMS ARE FORECAST TO INCREASE IN BOTH
COVERAGE AND INTENSITY AS THE GULF COAST AND LAKE BREEZES DEVELOP.

SOME OF THE STORMS COULD BECOME SEVERE DUE TO THE UNSTABLE
ATMOSPHERE PRESENT. THE STORMS WILL BE CAPABLE OF PRODUCING LARGE
HAIL TO QUARTER SIZE OR LARGER...DAMAGING WINDS TO 60 MPH...AND
FREQUENT LIGHTNING STRIKES. HEAVY RAINFALL IS AGAIN POSSIBLE ACROSS
THE AREA AS WELL...ALONG WITH POSSIBLE URBAN FLOODING WHERE STORMS
MOVE ACROSS THE SAME AREAS.

STAY TUNED TO UPDATES FROM THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MIAMI FOR POSSIBLE WATCHES AND WARNINGS FOR YOUR AREA.
WEATHER UPDATES CAN BE FOUND ONLINE AT WWW.WEATHER.GOV/MIAMI.

GREGORIA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
235 PM EDT WED APR 2 2008

FLZ069-070-021900-
COASTAL COLLIER COUNTY FL-INLAND COLLIER COUNTY FL-
235 PM EDT WED APR 2 2008

...STRONG THUNDERSTORM MOVING ACROSS COASTAL COLLIER COUNTY...

AT 231 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR ROYAL PALM HAMMOCK...MOVING NORTHWEST AT 14
MPH.

THIS STORM WILL AFFECT...

ROYAL PALM HAMMOCK...
MARCO ISLAND AIRPORT...
FIDDLERS CREEK...

AND SURROUNDING COMMUNITIES.

THE PRIMARY IMPACTS WILL BE UP TO PEA SIZED HAIL AND GUSTY WINDS OF
40 TO 50 MPH...WHICH CAN DOWN SMALL TREE LIMBS AND BRANCHES...AND
BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE BUILDING
UNTIL THE STORM PASSES.

RESIDENTS NEAR THE PATH OF THIS STORM SHOULD REMAIN ON THE ALERT FOR
ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.

LAT...LON 2618 8170 2598 8147 2586 8151 2589 8156
      2589 8157 2594 8168 2595 8169 2597 8169
      2597 8167 2598 8167 2597 8171 2606 8178
TIME...MOT...LOC 1835Z 124DEG 12KT 2598 8158

KOB

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
236 PM EDT WED APR 2 2008

FLZ063-066-021900-
HENDRY FL-GLADES FL-
236 PM EDT WED APR 2 2008

...STRONG THUNDERSTORM MOVING ACROSS NORTHEASTERN HENDRY COUNTY...

AT 235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
A THUNDERSTORM WAS RAPIDLY DEVELOPING 7 MILES SOUTH OF CLEWISTON...
MOVING NORTH AT 11 MPH.

THIS STORM WILL AFFECT...

MONTURA...
CLEWISTON...
MOORE HAVEN...

AND SURROUNDING COMMUNITIES.

FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS TO 50 MPH...PEA-SIZED
HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF THESE ARE POSSIBLE.
LIGHTNING IS THE NUMBER ONE WEATHER RELATED KILLER IN FLORIDA. TREES
AND OPEN SHELTERS OFFER NO PROTECTION. WIND GUSTS OF UP TO 50 MPH CAN
DOWN SMALL TREE LIMBS AND BRANCHES...AND BLOW AROUND UNSECURED SMALL
OBJECTS. SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORM PASSES.

RESIDENTS NEAR THE PATH OF THIS STORM SHOULD REMAIN ON THE ALERT FOR
ADDITIONAL STATEMENTS AND POSSIBLE WARNINGS.

LAT...LON 2682 8104 2682 8095 2681 8094 2680 8095
      2678 8094 2676 8091 2659 8089 2658 8105
      2684 8119 2685 8108
TIME...MOT...LOC 1836Z 164DEG 9KT 2665 8098

GREGORIA