Alert archive / Florida / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 96, NWS Miami, FL

August 31, 2004Collier County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 31, 2004, 4:28 PM EDT for Collier County, Florida. It was in force for 47 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
Aug 31, 2004, 4:28 PM EDT (20:28 UTC)
Expired
Aug 31, 2004, 5:15 PM EDT
In force
47 min
Issued by
NWS Miami, FL
Area
Counties, with a storm outline in the text

County Collier County, FL

The radar

The Miami radar (KAMX), 68 km from the middle of the area, began a volume at 20:30 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, 8.5 hours before the alert went out and 73 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-pSkew-T log-p diagram, Miami, FL at 12:00Z on 2004-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2895 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 2004-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2895 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
-22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KMFL 312028
SVRMIA
FLC021-312115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
428 PM EDT TUE AUG 31 2004

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN COLLIER COUNTY IN SOUTH FLORIDA.

* UNTIL 515 PM EDT

* AT 428 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  STORM CAPABLE OF PRODUCING DIME SIZE HAIL...AND DAMAGING WINDS 10
  MILES EAST OF MONROE STATION...MOVING WEST AT 15 MPH.

* THE STORM WILL AFFECT...
  DADE-COLLIER TRAINING AIRPORT.
  OASIS RANGER STATION.
  MONROE STATION.

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

FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES AND 
AVOID WATER. MOVE INDOORS OR INSIDE A VEHICLE IF POSSIBLE. 

LAT...LON 2583 8090 2603 8089 2597 8118 2583 8119

$$

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 Aug 31, 2:30 PM EDT, 1 hour 58 minutes earlier.

Area forecast discussion, Aug 31, 2:30 PM EDT, 1 hour 58 minutes before
SOUTH FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
230 PM EDT TUE AUG 31 2004

.DISCUSSION...UPPER LOW OVER THE AREA SHOULD MEAN A HIGHER CHANCE OF
RAIN THAT WE HAVE BEEN HAVING PREVIOUSLY.  WE WILL STILL PROBABLY BE
UNDER THE WESTERN PORTION OF THIS FEATURE TONIGHT WITH A LITTLE LESS
CERTAINTY OF ITS POSITION AND STRENGTH ON WEDNESDAY.  REGARDLESS
THIS SHOULD KEEP US IN AN UNSTABLE SITUATION WITH HIGHER
PROBABILITIES THROUGH TOMORROW.  AFTER THAT WE WILL SWITCH OVER TO
FRANCES CONSIDERATIONS. THE AREA OF DRIER AIR TO THE WEST OF THE
STORM SHOULD MOVE TO NEAR US BY THURSDAY.  SO WE WILL LOWER
PROBABILITIES UNTIL THE OUTER PORTION OF THE STORM GIVES US SOME
RAIN.  THIS SHOULD TEND TO KEEP ANY HIGHER PROBABILITIES OVER OUR
NORTHEASTERN FORECAST AREA. OVER THE WEEKEND WE SHOULD CONTINUE TO
HAVE RAINBANDS TO CONTEND WITH THEN BY THE BEGINNING OF THE WEEK
EVERYTHING SHOULD IMPROVE DRAMATICALLY.  SO BY THEN WE SHOULD BE
BACK TO A WEAK SURFACE HIGH AND AFTERNOON AND EVENING CONVECTION.
AN ESFMIA WILL BE ISSUED THIS AFTERNOON TO DISCUSS THE RAINFALL
AMOUNT POSSIBLIITIES.

&&

.MARINE...LATE TOMORROW NIGHT THE ATLANTIC WINDS WILL BEGIN THERE
INCREASE.  AFTER THAT TIME UNTIL THE BEGINNING OF THE WEEK
CONDITIONS WILL BECOME UNSAFE FOR BOATING. BY EARLY NEXT WEEK
BOATING SHOULD BE GOOD EXCEPT FOR SOME SWELL FROM FRANCES.

&&

.FIRE WEATHER...NO CONCERNS.

&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH 79 90 80 90 / 40 50 20 30
FORT LAUDERDALE 79 90 81 90 / 40 50 20 30
MIAMI           79 90 80 90 / 40 50 20 30
NAPLES          75 92 75 94 / 40 60 20 30
&&

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

&&
Hazardous weather outlook, Aug 31, 10:22 AM EDT, 6 hours 6 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
1022 AM EDT TUE AUG 31 2004

FLZ063-066>075-312200-
BROWARD METROPOLITAN-DADE METROPOLITAN-EASTERN COLLIER-GLADES-HENDRY-
MAINLAND MONROE-PALM BEACH EASTERN-PALM BEACH WESTERN-
WESTERN BROWARD-WESTERN COLLIER-WESTERN DADE-
1022 AM EDT TUE AUG 31 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA.

.DAY ONE...TODAY

...SCATTERED MAINLY INLAND AFTERNOON THUNDERSTORMS...

SEA BREEZE CONVERGENCE THIS AFTERNOON WILL PRODUCE SCATTERED
THUNDERSTORM ACTIVITY, MAINLY OVER INTERIOR SECTIONS OF SOUTH
FLORIDA. GUSTY WINDS IN EXCESS OF 35 MPH, OCCASIONAL LIGHTNING,
SMALL HAIL, AND LOCALLY HEAVY DOWNPOURS ARE POSSIBLE WITH THESE
STORMS.

ADDITIONAL INFORMATION AND DETAILED GRAPHICS CAN BE FOUND ON THE
NATIONAL WEATHER SERVICE WEB SITE AT MIAMIWEATHER.INFO. FOR
INFORMATION IN SPANISH, VISIT OUR WEB SITE AT ELTIEMPOENMIAMI.INFO.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

HURRICANE FRANCES IS FORECAST TO MOVE WEST-NORTHWEST INTO THE
NORTHERN BAHAMAS BY LATE FRIDAY. ALL PERSONS IN SOUTH FLORIDA SHOULD
KEEP UP WITH THE LATEST INFORMATION ON FRANCES AS SHE APPROACHES THE
BAHAMAS LATER THIS WEEK. EARLY PREPAREDNESS ACTIONS SUCH AS STOCKING
UP ON NON-PERISHABLES SUCH AS BATTERIES, WATER AND CANNED GOODS ARE
ENCOURAGED.

COMPREHENSIVE WEATHER FORECASTS, GRAPHICS, AND PREPAREDNESS
INFORMATION CAN BE FOUND ON OUR WEB SITE AT MIAMIWEATHER.INFO.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

Nearby

Severe Thunderstorm Warnings in Florida, 2004Every severe thunderstorm warning in 2004

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.