Alert archive / Florida / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 87, NWS Miami, FL

August 16, 2004Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 16, 2004, 4:32 PM EDT for Palm Beach County, Florida. It was in force for 43 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 16, 2004, 4:32 PM EDT (20:32 UTC)
Expired
Aug 16, 2004, 5:15 PM EDT
In force
43 min
Issued by
NWS Miami, FL
Area
Counties, with a storm outline in the text

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 122 km from the middle of the area, began a volume at 20:36 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 100 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 2004-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1037 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 2004-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 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
1037 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1082 m above ground
0-6 km bulk shear
3 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
-13 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 162032
SVRMIA
FLC099-162115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
430 PM EDT MON AUG 16 2004

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 515 PM EDT

* AT 430 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  STORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS   
  OVER CENTRAL PALM BEACH COUNTY. THE STORM WAS NEARLY STATIONARY.

* THE STORM WILL AFFECT...
  RURAL NORTHERN AND CENTRAL PALM BEACH COUNTY 
   
SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60
MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR 
HOME OR BUSINESS. 

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. AVOID
USING THE TELEPHONE UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG
UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

LAT...LON 2675 8035 2687 8050 2666 8063 2649 8054

$$

DG

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 16, 1:56 PM EDT, 2 hours 36 minutes earlier.

Area forecast discussion, Aug 16, 1:56 PM EDT, 2 hours 36 minutes before
SOUTH FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
156 PM EDT MON AUG 16 2004

.DISCUSSION...NORMAL SUMMER PATTERN HAS SETTLED IN ACROSS SOUTH
FLORIDA. OVER THE COMING WEEK...HIGH PRESSURE WILL REMAIN ALOFT AND A
RIDGE WILL RESIDE JUST TO THE NORTH. LIGHT EAST/SOUTHEAST FLOW WILL
PICK UP A BIT BY THE WEEKEND AS TROPICAL WAVE PASSES TO THE SOUTH.
OTHER THAN THAT...NOT MUCH CHANGE EXPECTED THROUGH THE FORECAST
PERIOD. DAY TO DAY SUBTLE CHANGES IN MESOSCALE FEATURES WILL DICTATE
TIMING AND PLACEMENT OF SHOWERS AND STORMS. WITH PRECIPITABLE WATER
EXPECTED TO BE A BIT BELOW NORMAL...WILL KEEP POPS ABOUT 10 PERCENT OR
SO BELOW CLIMO. SHOULD SEE A COUPLE OF SHOWERS OR STORMS OVERNIGHT INTO
EARLY MORNING EAST COAST ZONES...AFTERNOON/EVENING STORMS INLAND
PORTIONS OF EAST COAST METRO AREAS WESTWARD TO THE WEST COAST
SEABREEZE. TEMPERATURES WILL BE RIGHT ABOUT NORMAL...WHICH MEANS HEAT
INDICES EACH DAY FROM 100 TO 110...COASTAL TO FAR INTERIOR
RESPECTIVELY.

&&

.MARINE...WINDS WILL REMAIN MOSTLY EAST/SOUTHEAST AT 15 KNOTS OR LESS
THROUGH THE WEEKEND.

&&

.FIRE WEATHER...NO PROBLEMS/CONCERNS.
&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH 78 90 78 90 / 20 30 20 30
FORT LAUDERDALE 80 89 80 90 / 20 20 20 20
MIAMI           80 90 80 90 / 20 30 20 30
NAPLES          76 91 76 91 / 20 40 30 50
&&

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

&&
Hazardous weather outlook, Aug 16, 12:55 PM EDT, 3 hours 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MIAMI FL
1255 PM EDT MON AUG 16 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA

FLZ063-066>075-162200-
BROWARD METROPOLITAN-DADE METROPOLITAN-EASTERN COLLIER-GLADES-HENDRY-
MAINLAND MONROE-PALM BEACH EASTERN-PALM BEACH WESTERN-
WESTERN BROWARD-WESTERN COLLIER-WESTERN DADE-
1255 PM EDT MON AUG 16 2004

.DAY ONE...TODAY

...MODERATE RISK OF LIGHTNING MAINLY INTERIOR...
...HEAT INDEX 100 TO 105 ALONG GULF AND ATLANTIC COAST...
...HEAT INDEX 105 TO 110 INTERIOR...

SCATTERED THUNDERSTORMS WILL DEVELOP ALONG THE EAST AND WEST COAST
SEA BREEZES AND MOVE TO THE NORTHWEST. SOME DRYING OF THE
UPPER ATMOSPHERE HAS OCCURRED AND THIS HAS RESULTED IN THE THREAT FOR
A FEW STORMS TO BECOME STRONG OVER THE INTERIOR SECTIONS OF SOUTH
FLORIDA. THE THREAT WILL BE FOR STRONG SURFACE WINDS OF 35 TO 45 MPH
TO OCCUR WITH THESE STORMS.

IN ADDITION, TEMPERATURES IN THE LOWER 90S NEAR THE COAST, TO SOME
MID 90S INLAND, COMBINED WITH RELATIVE HUMIDITY, WILL PRODUCE HEAT
INDEX VALUES OF 100 TO 105 AT THE COAST WITH 105 TO 110 HEAT INDEX
READINGS IN THE INTERIOR.

NO OTHER HAZARDOUS WEATHER IS EXPECTED.

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...TUESDAY THROUGH SUNDAY.

NO OTHER HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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.