Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 12, NWS Miami, FL

May 20, 2009Hendry County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 20, 2009, 3:01 PM EDT for Hendry County, Palm Beach County, Florida. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 20, 2009, 3:01 PM EDT (19:01 UTC)
Expired: May 20, 2009, 3:36 PM EDT
In force: 35 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

Counties Hendry County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 126 km from the middle of the area, began a volume at 19:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 7.0 hours before the alert went out and 109 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1791 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS52 KMFL 201901
SVRMFL
FLC051-099-202000-
/O.NEW.KMFL.SV.W.0012.090520T1901Z-090520T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
301 PM EDT WED MAY 20 2009

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL PALM BEACH COUNTY IN SOUTH FLORIDA.
  NORTHEASTERN HENDRY COUNTY IN SOUTH FLORIDA.

* UNTIL 400 PM EDT

* AT 300 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 4 MILES SOUTHWEST OF
  OKEELANTA...AND MOVING NORTHWEST AT 15 MPH.

* THE STORM WILL AFFECT...
  OKEELANTA...
  SOUTH BAY...
  AND SURROUNDING COMMUNITIES.

SEVERE THUNDERSTORMS CAN ALSO PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN AN INTERIOR
ROOM IN THE LOWEST FLOOR OF YOUR HOUSE OR BUSINESS IF A TORNADO IS
SPOTTED.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI. OR YOU CAN
ALSO CALL THE NATIONAL WEATHER SERVICE IN MIAMI DIRECTLY AT
305.229.4528 TO REPORT SEVERE WEATHER.

LAT...LON 2677 8072 2651 8061 2644 8081 2676 8102
      2676 8089 2673 8084 2671 8082 2671 8078
      2669 8074 2672 8073 2677 8075
TIME...MOT...LOC 1901Z 151DEG 14KT 2656 8076

$$

BAXTER

2 follow-up statements

694 
WWUS52 KMFL 201924
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
324 PM EDT WED MAY 20 2009

FLC051-099-202000-
/O.CON.KMFL.SV.W.0012.000000T0000Z-090520T2000Z/
HENDRY FL-PALM BEACH FL-
324 PM EDT WED MAY 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR WEST CENTRAL PALM BEACH AND NORTHEASTERN HENDRY COUNTIES...

AT 321 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORM NEAR HOLEY LAND WILDLIFE HAS WEAKEN. HOWEVER...NEW
THUNDERSTORMS WERE DEVELOPING NORTHWEST OF THE STORM NEAR HOLEY LAND
WILDLIFE WHICH WERE APPROACHING SEVERE LIMITS. THESE STORMS WILL MOVE TO
THE NORTHWEST AROUND 15 MPH INTO THE AREAS OF LAKE HARBOR AND CLEWISTON.

SEVERE THUNDERSTORMS CAN ALSO PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN AN INTERIOR
ROOM IN THE LOWEST FLOOR OF YOUR HOUSE OR BUSINESS IF A TORNADO IS
SPOTTED.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

LAT...LON 2669 8074 2651 8061 2644 8081 2676 8102
      2676 8089 2673 8084 2671 8082 2671 8078
TIME...MOT...LOC 1921Z 143DEG 13KT 2661 8082

$$

BAXTER

637 
WWUS52 KMFL 201936
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
336 PM EDT WED MAY 20 2009

FLC051-099-201944-
/O.CAN.KMFL.SV.W.0012.000000T0000Z-090520T2000Z/
HENDRY FL-PALM BEACH FL-
336 PM EDT WED MAY 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL PALM BEACH AND
NORTHEASTERN HENDRY COUNTIES IS CANCELLED...

THE THUNDERSTORMS THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS
WEAKEN BELOW SEVERE LIMITS. THEREFORE...THE SEVERE THUNDERSTORM WARNING
HAS BEEN CANCELLED FOR WEST CENTRAL PALM BEACH...AND NORTHEAST HENDRY
COUNTIES. THUNDERSTORMS REMAIN IN THE AREA WHICH CAN STILL PRODCUE 
FREQUENT LIGHTNING...GUSTY WINDS TO 40 MPH...VERY HEAVY RAINFALL
AND SMALL HAIL. STAY TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA FOR
THE LATEST UPDATES.

LAT...LON 2669 8074 2651 8061 2644 8081 2676 8102
      2676 8089 2673 8084 2671 8082 2671 8078
TIME...MOT...LOC 1934Z 143DEG 13KT 2665 8085

$$

BAXTER

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Miami, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 1:40 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, May 20, 1:40 PM EDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
140 PM EDT WED MAY 20 2009

.AVIATION...VFR CONDITIONS EXPECTED FOR KPBI WHICH IS CURRENTLY
IFR IN CLDS IN TSTMS, THEY WILL BECOME VFR SHORTLY. HOTTEST AREAS
FOR TSTMS THIS AFTN IS JUST WEST OF METRO PALM BEACH COUNTY
NORTHWEST THRU AND PAST THE LAKE TO THE NW. OTHER TERMINALS WILL
HAVE VCSH OR VCTS FOR WORST CONDITIONS IN VFR. MODELS INCREASE
WINDS OVER EAST TERMINALS NORTH OF KFLL OVERNIGHT AND THERE WILL
BE A CHC OF TSTMS THERE. FOR MID MORNING THURSDAY, ONLY VCTS FOR
EAST TERMINALS AND VCSH FOR KAPF.

&&

.PREV DISCUSSION... /ISSUED 1009 AM EDT WED MAY 20 2009/

UPDATE...
STACKED LOW CONTINUES TO SPIN OFFSHORE OF NAPLES AND IS
SLOWLY...VERY SLOWLY DRIFTING TO THE WEST THIS MORNING. ON THE
EAST SIDE OF THIS SYSTEM...DEEP/NEARLY UNIDIRECTIONAL SSERLY FLOW
HAS FORMED CELLULAR BANDS OF SHOWERS/A FEW THUNDERSTORMS OVER THE
ATLANTIC WATERS AND EAST COAST METRO AREAS WITH THE REMAINDER OF
THE LAND MASS DRY. THE 12Z MIAMI RAOB IS FAVORABLE FOR STRONG TO
SEVERE THUNDERSTORMS TODAY...AS 500MB TEMPS OF -13C AND STEEP MID
LEVEL LAPSE RATES FROM 650-500MB SHOULD CONTRIBUTE TO PLENTY OF
INSTABILITY THIS AFTERNOON...WITH CAPES AROUND 3000J/KG IF ENOUGH
HEATING IS REALIZED TO WARM TEMPS INTO THE LOWER TO MID 80S. IF
THIS HAPPENS...DRY MID LEVELS FROM THE DRY SLOT ON THE SERN
PERIPHERY OF STACKED LOW WOULD ALSO ENHANCE HAIL POTENTIAL...AND
WET BULB ZERO HEIGHTS AROUND 10,400 FT ARE VERY FAVORABLE FOR HAIL
IN SOUTH FLORIDA. DEEP LAYER SHEAR IS NOT OVERLY IMPRESSIVE...BUT
GRADUAL STRENGTHENING/VEERING FLOW THROUGH THE MID LEVELS WOULD
FAVOR CONTINUED DEVELOPMENT OF CELLULAR CONVECTION AND POSSIBLE
ORGANIZATION INTO CONVECTIVE BANDS. SPC HAS PLACED MOST OF SOUTH
FL IN A SLIGHT RISK FOR SEVERE WEATHER TODAY...AND THIS IS ALREADY
REFLECTED IN THE HWO.

/STRASSBERG

PREV DISCUSSION... /ISSUED 813 AM EDT WED MAY 20 2009/

AVIATION...VFR CONDITIONS TO START THE MORNING OFF. SOUTHEAST
WIND FLOW WILL INCREASE OVER THE EAST TERMINALS THIS MORNING AND
BY MID AFTERNOON POSSIBLY EARLIER, A SEABREEZE WILL DEVELOP OVER
KAPF. FOR NOW HAVE PLACED A VCTS IN EAST TERMINALS AFT 14Z AND IN
KAPF AFT 19Z. MOST ACTIVITY SHOULD BE OVER NORTHWEST AREAS OF
SOUTH FLORIDA THIS AFTERNOON AWAY FROM THE TERMINALS. HOWEVER,
AMENDMENTS WILL BE ISSUED FOR ANY LOWER THAN VFR CONDITIONS IN RW
OR TSTMS.

PREV DISCUSSION... /ISSUED 447 AM EDT WED MAY 20 2009/

DISCUSSION...AN AREA OF LOW PRESSURE AT THE SURFACE IS CENTERED
ROUGHLY 55-65NM WEST OF NAPLES THIS MORNING WHILE IT REMAINS
NEARLY VERTICALLY STACKED WITH THE MID TO UPPER LOW. ALSO... A
STATIONARY FRONT REMAINS PARKED OVER NORTHERN FL EXTENDING INLAND FROM
THE ATLANTIC. A FAIRLY STRONG AREA OF HIGH PRESSURE IS CENTERED
JUST EAST OF THE MID ATLANTIC STATES.

TODAY THE SURFACE LOW WEST OF APF WILL SLOWLY MOVE DEEPER INTO
THE GULF WHILE THE UPPER LOW MOVES SLOWLY NORTHWARD ALONG THE GULF
COAST. THE PRESSURE GRADIENT BETWEEN THE SURFACE LOW WEST OF APF
AND THE RIDGE OVER THE MID ATLANTIC STATES WILL KEEP CENTRAL AND
NORTHEAST FLORIDA WINDY AND WET, BUT THE GRADIENT IN S FL WILL
REMAIN FAIRLY WEAK. THE UPPER LOW IS EXPECTED TO KEEP A DIVERGENT
FLOW ALOFT OVER S FL WHILE PUSHING IN DRY AIR AT THE MID LEVELS.
MOISTURE WILL ALSO CONTINUE TO MOVE IN AT THE SURFACE. RUC
ANALYSIS ALREADY SHOWS 500MB TEMPS DOWN TO -13C THIS MORNING OVER
SOUTHERN PORTIONS OF THE CWA AND THE RUC/NAM/GFS FORECASTS ALL
KEEP THE MID LEVEL TEMPS AT AROUND -12C THROUGH THE AFTERNOON. BOTTOM
LINE... MID AND UPPER LEVEL DRYNESS WILL KEEP MOST CLOUDS NORTH OF
THE AREA THIS MORNING, POSSIBLY ALLOWING THE CWA TO WARM,
ESPECIALLY OVER THE INTERIOR, AND THIS WILL LEAD TO FARTHER
DESTABILIZATION. MID LEVEL DRY LAYER AND COLD TEMPS WILL LEAD TO
NUMEROUS THUNDERSTORMS IN THE AFTERNOON AND SOME ISOLATED
THUNDERSTORMS MAY PLAY ROUGH WITH EXCESSIVE LIGHTNING, HEAVY
RAINFALL, GUSTY WINDS TO NEAR 60MPH, AND HAIL POSSIBLY UP TO ONE
INCH... HOWEVER THERE IS A DISCLAIMER... IF SHOWERS AND
THUNDERSTORMS DEVELOP EARLIER IN THE DAY ENOUGH CLOUD COVER WILL
KEEP AFTERNOON CONVECTION FROM REACHING ITS FULL POTENTIAL. ALONG
THE SE COAST... MOST CONVECTION WILL BE INLAND FROM COASTAL DADE
AND COASTAL BROWARD, BUT A PASSING SHOWER OR THUNDERSTORM MOVING
IN FROM THE ATLANTIC WILL OCCUR... JUST LIKE WHAT IS HAPPENING NOW
WITH THE CONVERGENCE BAND THAT HAS SET UP. ALONG THE WEST COAST
AND INTO HENDRY AND GLADES COUNTIES... THIS AREA WILL LIKELY SEE
THE MOST HEATING AND POSSIBLY EVEN A SEA BREEZE. THIS WILL LEAD TO
CONVERGENCE AND GIVE THUNDERSTORMS A FOCUS... HENCE THE HIGHEST
POPS IN THE CWA.

THURSDAY AND FRIDAY... RESIDUAL MOISTURE WILL REMAIN AROUND SOUTH
FLORIDA WITH SCATTERED TO NUMEROUS MAINLY AFTERNOON AND EARLY
EVENING THUNDERSTORMS EXPECTED. AFTERNOON CONVECTION WILL BE
AIDED BY A BIT OF UPPER LEVEL DIVERGENCE FROM THE UPPER LOW
RETROGRADING BACK TO THE NW AND SLOWLY WEAKENING AS IT DOES SO.

BEYOND FRIDAY... A MORE CLIMO LIKE/NORMAL WET SEASON PATTERN IS
EXPECTED WITH SCATTERED THUNDERSTORMS EACH AFTERNOON MAINLY INLAND
AND AWAY FROM THE COASTS AS DAYTIME HEATING AND SEA BREEZE
COLLISION OCCURS.

MARINE...WIND FORECASTS WILL REMAIN SOMEWHAT PROBLEMATIC TODAY
AS THE SURFACE LOW WEST OF NAPLES SLOW DRIFTS FARTHER INTO THE
GULF. WINDS WILL LIKELY CONTINUE TO BE FAIRLY BREEZY, BUT BELOW
SCA CRITERIA IN THE ATLANTIC WATERS, OUTSIDE OF SHOWERS AND
THUNDERSTORMS. IN THE GULF WINDS WILL CONTINUE TO VEER AROUND THE
LOW, BUT REMAIN FAIRLY LIGHT.

AFTER TODAY... THE LOW WILL MOVE FARTHER AWAY AND A GENERAL SE
FLOW WILL ENSUE. WINDS ARE EXPECTED TO REMAIN AT OR LESS THAN
15KTS FOR THE REST OF THE PERIOD.

FIRE WEATHER...NO PROBLEMS OR CONCERNS.

&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH  74  83  74  83 / 40 40 30 40
FORT LAUDERDALE  73  83  74  82 / 30 30 30 40
MIAMI            74  84  74  84 / 30 40 30 40
NAPLES           68  87  69  86 / 30 50 30 40

&&

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

LONG TERM...65/GS
SHORT TERM/AVIATION...18/GR

Hazardous weather outlook, May 20, 9:10 AM EDT, 5 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK FOR SOUTH FLORIDA
NATIONAL WEATHER SERVICE MIAMI FL
910 AM EDT WED MAY 20 2009

FLZ063-066>075-168-172>174-210200-
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-
910 AM EDT WED MAY 20 2009

...ISOLATED SEVERE STORMS POSSIBLE MAINLAND THIS AFTERNOON...
...HIGH RISK OF RIP CURRENTS CONTINUES AT THE ATLANTIC BEACHES...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY AND TONIGHT

RIP CURRENTS: EAST SOUTHEAST WINDS NEAR 15 MPH ACROSS THE ATLANTIC
WATERS WILL LEAD TO A HIGH RISK OF RIP CURRENTS AT THE ATLANTIC
BEACHES OF PALM BEACH, BROWARD, AND MIAMI DADE COUNTIES. SWIMMING IS
NOT RECOMMENDED.

THUNDERSTORMS: THUNDERSTORMS ARE EXPECTED ACROSS THE AREA TODAY,
THOUGH THE MAIN FOCUS IS EXPECTED TO BE ACROSS INTERIOR LOCALES THIS
AFTERNOON AND EVENING. A FEW STORMS ACROSS THESE AREAS COULD EVEN
BECOME SEVERE, CAPABLE OF PRODUCING DAMAGING WINDS AND LARGE HAIL. A
FEW STRONG STORMS ARE POSSIBLE ACROSS THE REST OF THE AREA.

WIND: THUNDERSTORMS OVER THE INTERIOR WILL BE CAPABLE OF PRODUCING
DAMAGING WINDS TO 60 MPH. ELSEWHERE...GUSTS OF 40 TO 50 MPH WILL BE
POSSIBLE.

HAIL: HAIL TO AROUND QUARTER SIZE IS POSSIBLE ACROSS MAINLY INTERIOR
LOCALES THIS AFTERNOON.

FLOODING: THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY
RAINFALL IN A SHORT PERIOD OF TIME. THIS COULD LEAD TO LOCALIZED
STREET FLOODING, ESPECIALLY WHERE SHOWERS AND STORMS CONTINUOUSLY
MOVE OVER AN AREA.

TORNADOES: A BRIEF TORNADO CANNOT BE RULED OUT TODAY, GIVEN A
MOIST LOW LEVEL ENVIRONMENT ALONG WITH A SLIGHTLY FAVORABLE LOW
LEVEL WIND PROFILE.

WATERSPOUTS: THERE IS A MODERATE RISK OF WATERSPOUTS ACROSS THE
COASTAL WATERS TODAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

TYPICAL MAINLY AFTERNOON AND EARLY EVENING THUNDERSTORMS ARE
EXPECTED EACH DAY, FOCUSED ACROSS INTERIOR LOCALES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

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

GR

In the hours before

Special weather statement, May 20, 12:30 PM EDT, 2 hours 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
1230 PM EDT WED MAY 20 2009

FLZ067-201700-
INLAND PALM BEACH COUNTY FL-
1230 PM EDT WED MAY 20 2009

...STRONG THUNDERSTORMS MOVING ACROSS WESTERN PALM BEACH COUNTY...

AT 1227 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BELLE GLADE TO 12
MILES EAST OF HOLEY LAND WILDLIFE MANAGEMENT AREA...MOVING NORTHWEST
AT 15 MPH.

THESE STORMS WILL AFFECT...

BELLE GLADE...
SOUTH BAY...
U S 27...
U S 441...

AND SURROUNDING COMMUNITIES.

FREQUENT TO EXCESSIVE LIGHTNING...GUSTY WINDS TO 50 MPH...PEA-SIZED
HAIL...TORRENTIAL DOWNPOURS...OR A COMBINATION OF THESE ARE POSSIBLE.
SEEK SHELTER IN A SAFE BUILDING UNTIL THE STORMS HAVE PASSED.

ALSO...THESE STORMS ARE DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR
TORNADOES.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAT...LON 2634 8059 2668 8081 2670 8076 2669 8074
      2671 8073 2675 8063 2641 8038
TIME...MOT...LOC 1629Z 138DEG 11KT 2668 8069 2643 8054

BAXTER

Special weather statement, May 20, 12:39 PM EDT, 2 hours 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
1239 PM EDT WED MAY 20 2009

FLZ071-072-201745-
INLAND BROWARD COUNTY FL-METRO BROWARD COUNTY FL-
1239 PM EDT WED MAY 20 2009

...STRONG THUNDERSTORM MOVING ACROSS CENTRAL BROWARD COUNTY...

AT 1238 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR SAWGRASS MILLS MALL...MOVING NORTHWEST AT 10
MPH.

THIS STORM WILL AFFECT...

MARKHAM PARK...
INTERSECTION I-75 AND U.S. 27...

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.

ALSO...THIS STORM IS DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR
TORNADOES.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAT...LON 2633 8061 2633 8031 2612 8029 2610 8040
TIME...MOT...LOC 1639Z 153DEG 11KT 2613 8035

BAXTER

Special weather statement, May 20, 1:35 PM EDT, 1 hour 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
135 PM EDT WED MAY 20 2009

FLZ063-066-067-201830-
HENDRY FL-GLADES FL-INLAND PALM BEACH COUNTY FL-
135 PM EDT WED MAY 20 2009

...STRONG THUNDERSTORMS MOVING ACROSS NORTHWEST INTERIOR AREAS AND
WESTERN LAKE OKEECHOBEE AREA OF SOUTH FLORIDA...

AT 133 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES EAST OF
VENUS TO 3 MILES WEST OF OKEELANTA...MOVING NORTHWEST AT 10 MPH.

THESE STORMS WILL AFFECT...

CLEWISTON...
LAKEPORT...
LAKE HARBOR...
BRIGHTON SEMINOLE INDIAN...
OKEELANTA...

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.

ALSO...THESE STORMS ARE DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR
TORNADOES.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAT...LON 2704 8093 2703 8097 2705 8097 2698 8108
      2692 8107 2693 8110 2689 8111 2685 8109
      2682 8095 2678 8094 2671 8082 2670 8073
      2647 8060 2650 8100 2704 8137 2704 8128
      2712 8127 2713 8118 2720 8117 2721 8103
TIME...MOT...LOC 1735Z 301DEG 9KT 2706 8123 2659 8076

BAXTER

Special weather statement, May 20, 2:35 PM EDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
235 PM EDT WED MAY 20 2009

FLZ063-066-067-201930-
HENDRY FL-GLADES FL-INLAND PALM BEACH COUNTY FL-
235 PM EDT WED MAY 20 2009

...STRONG THUNDERSTORMS MOVING ACROSS SOUTHWEST LAKE OKEECHOBEE AREA
AND EASTERN GLADES COUNTY...

AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHWEST OF
CLEWISTON TO 6 MILES SOUTHEAST OF CLEWISTON...MOVING NORTHWEST AT 10
MPH.

THESE STORMS WILL AFFECT...

CLEWISTON...
HARLEM...
LAKEPORT...

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.

ALSO...THESE STORMS ARE DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR
TORNADOES.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAT...LON 2708 8119 2699 8107 2692 8107 2692 8108
      2693 8110 2689 8111 2688 8109 2685 8109
      2682 8104 2682 8095 2678 8094 2673 8083
      2658 8082 2677 8125
TIME...MOT...LOC 1835Z 144DEG 8KT 2682 8097 2668 8089

BAXTER

Local storm report, May 20, 2:37 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIAMI FL
237 PM EDT WED MAY 20 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0940 AM     WATER SPOUT      2 E MIAMI BEACH         25.81N 80.10W
05/20/2009                   AMZ651             FL   FIRE DEPT/RESCUE

            WATERSPOUT OBSERVED 2 MILES EAST OF MIAMI BEACH.

1200 PM     WATER SPOUT      BOYNTON BEACH           26.53N 80.09W
05/20/2009                   PALM BEACH         FL   PUBLIC

            A WATERSPOUT WAS OBSERVED JUST OFFSHORE

1225 PM     HAIL             LANTANA                 26.59N 80.06W
05/20/2009  E0.25 INCH       PALM BEACH         FL   TRAINED SPOTTER

            PEA SIZED HAIL WAS REPORTED ALONG FEDERAL HIGHWAY IN
            LANTANA.

0140 PM     HAIL             LAKEPORT                26.98N 81.13W
05/20/2009  E0.75 INCH       GLADES             FL   FIRE DEPT/RESCUE

            PENNY SIZED HAIL WAS OBSERVED IN LAKEPORT.

0145 PM     TSTM WND GST     10 NW PAHOKEE           26.90N 80.79W
05/20/2009  M39.00 MPH       AMZ610             FL   COUNTY OFFICIAL

            A WIND GUST OF 39 MPH WAS MEASURED AT SOUTH FLORIDA WATER
            MANAGEMENT DISTRICT SITE LZ40.

0145 PM     TSTM WND GST     BELLE GLADE             26.69N 80.67W
05/20/2009  M58.00 MPH       PALM BEACH         FL   MESONET

            A WIND GUST OF 58 MPH WAS MEASURED AT THE BELLE GLADE
            MESONET SITE.

0145 PM     TSTM WND GST     6 E BUCKHEAD RIDGE      27.14N 80.79W
05/20/2009  M42.00 MPH       AMZ610             FL   COUNTY OFFICIAL

            A 42 MPH WIND GUST WAS MEASURED AT SOUTH FLORIDA WATER
            MANAGEMENT DISTRICT SITE L001

0154 PM     TSTM WND DMG     BELLE GLADE             26.69N 80.67W
05/20/2009                   PALM BEACH         FL   LAW ENFORCEMENT

            A TREE AND POWER LINES WERE REPORTED DOWN IN THE CITY OF
            BELLE GLADE.

0155 PM     HAIL             LAKEPORT                26.98N 81.13W
05/20/2009  E1.00 INCH       GLADES             FL   FIRE DEPT/RESCUE

            QUARTER SIZED HAIL WAS REPORTED IN LAKEPORT. THIS BEGAN
            AT 151 PM.

0200 PM     TSTM WND GST     6 E BUCKHEAD RIDGE      27.14N 80.79W
05/20/2009  M45.00 MPH       AMZ610             FL   COUNTY OFFICIAL

            A WIND GUST WAS MEASURED AT 45 MPH AT THE SOUTH FLORIDA
            WATER MANAGEMENT DISTRICT SITE L001

&&

CARACOZZA

Special weather statement, May 20, 2:38 PM EDT, 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
238 PM EDT WED MAY 20 2009

FLZ067-201945-
INLAND PALM BEACH COUNTY FL-
238 PM EDT WED MAY 20 2009

...STRONG THUNDERSTORM MOVING ACROSS WESTERN PALM BEACH COUNTY...

AT 238 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 4 MILES NORTH OF HOLEY LAND WILDLIFE MANAGEMENT
AREA...MOVING NORTHWEST AT 10 TO 15 MPH.

THIS STORM WILL AFFECT...

OKEELANTA...
SOUTH BAY...
LAKE HARBOR...
US 27...

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.

ALSO...THIS STORM IS DEVELOPING IN AN ENVIRONMENT FAVORABLE FOR
TORNADOES.

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

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

LAT...LON 2645 8055 2635 8078 2656 8088 2674 8088
      2674 8086 2671 8082 2671 8078 2669 8074
      2672 8073 2676 8075 2677 8074
TIME...MOT...LOC 1838Z 151DEG 14KT 2648 8071

BAXTER

The office that day

Everything else NWS Miami, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 1:05 AM EDT	Special Marine Warning	MFL		25 min
May 20, 3:35 AM EDT	Coastal Flood Statement	MFL	Broward, Miami-Dade, Palm Beach	16 hr
May 20, 9:43 AM EDT	Special Marine Warning	MFL		32 min
May 20, 10:45 AM EDT	Special Marine Warning	MFL		60 min
May 20, 11:41 AM EDT	Special Marine Warning	MFL		64 min
May 20, 12:04 PM EDT	Tornado Warning	MFL	Palm Beach	26 min
May 20, 12:24 PM EDT	Special Weather Statement	MFL	Palm Beach	51 min
May 20, 12:30 PM EDT	Special Weather Statement	MFL	Palm Beach	30 min
May 20, 12:33 PM EDT	Special Marine Warning	MFL		57 min
May 20, 12:39 PM EDT	Special Weather Statement	MFL	Broward	66 min
May 20, 12:46 PM EDT	Tornado Warning	MFL	Palm Beach	19 min
May 20, 12:52 PM EDT	Special Marine Warning	MFL		113 min
May 20, 1:20 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	13 min
May 20, 1:22 PM EDT	Special Marine Warning	MFL		53 min
May 20, 1:30 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	30 min
May 20, 1:35 PM EDT	Special Weather Statement	MFL	Glades	55 min
May 20, 1:54 PM EDT	Severe Thunderstorm Warning	MFL	Glades	18 min
May 20, 1:58 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	21 min
May 20, 2:17 PM EDT	Special Marine Warning	MFL		58 min
May 20, 2:35 PM EDT	Special Weather Statement	MFL	Glades	55 min
May 20, 2:38 PM EDT	Special Weather Statement	MFL	Palm Beach	67 min
May 20, 2:41 PM EDT	Special Marine Warning	MFL		94 min
May 20, 3:12 PM EDT	Special Marine Warning	MFL		32 min
May 20, 3:15 PM EDT	Special Weather Statement	MFL	Broward	60 min
May 20, 4:10 PM EDT	Special Marine Warning	MFL		80 min
May 20, 4:11 PM EDT	Special Weather Statement	MFL	Hendry	64 min
May 20, 5:19 PM EDT	Special Marine Warning	MFL		94 min
May 20, 5:34 PM EDT	Special Weather Statement	MFL	Broward	56 min
May 20, 5:57 PM EDT	Special Marine Warning	MFL		53 min
May 20, 6:30 PM EDT	Special Weather Statement	MFL	Palm Beach	60 min
May 20, 6:44 PM EDT	Special Weather Statement	MFL	Broward	61 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.