Alert archive / Florida / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 79, NWS Miami, FL

August 12, 2004Miami-Dade County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Aug 12, 2004, 11:58 PM EDT for Miami-Dade 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 12, 2004, 11:58 PM EDT (03:58 UTC)
Expired
Aug 13, 2004, 12:45 AM EDT
In force
47 min
Issued by
NWS Miami, FL
Area
Counties, with a storm outline in the text

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 17 km from the middle of the area, began a volume at 04:01 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 9:35 PM EDTTornado WatchSPC10 hr

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 4.0 hours before the alert went out and 42 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 00:00Z on 2004-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2493 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2004-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 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
2493 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
1169 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
46 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 130358
SVRMIA
FLC086-130445-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1158 PM EDT THU AUG 12 2004

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL MIAMI-DADE COUNTY IN SOUTH FLORIDA.

* UNTIL 1245 AM EDT

* AT 1158 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  STORM CAPABLE OF PRODUCING DAMAGING WINDS 9 MILES SOUTHWEST OF
  HOMESTEAD...MOVING NORTH AT 40 MPH.

* THE STORM WILL AFFECT...
  ROYAL PALM RANGER STATION.
  FLORIDA CITY.
  REDLAND.
  KENDALE LAKES.

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. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS 
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 2528 8065 2528 8045 2591 8040 2592 8066

$$

TW

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 12, 2:00 PM EDT, 9 hours 58 minutes earlier.

Area forecast discussion, Aug 12, 2:00 PM EDT, 9 hours 58 minutes before
SOUTH FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIAMI FL
200 PM EDT THU AUG 12 2004

.DISCUSSION...STILL WAITING FOR CHARLEY TO MAKE ITS IMPACT FELT
WHICH WILL GOVERN THE WEATHER THROUGH FRIDAY.  THE WAY IT LOOKS NOW
THE RAIN WILL START OVER THE WESTERN ZONES LATE TONIGHT AND OVER THE
EASTERN ZONES TOMORROW AFTERNOON.  SINCE THERE IS A LARGE AREA OF
DRIER AIR NORTH AND EAST OF THE STORM THE EXTREME EASTERN PORTION OF
THE ZONES WILL BE A PLACE WHERE THE RAIN CHANCE CAN BE LOWER THAN
WHAT WILL BE MENTIONED IN THE TEXT.  WE WILL STILL FEEL THE EFFECTS
OF CHARLEY ON SATURDAY IN THE FORM OF SOME FEEDER BAND THROUGH OUR
ZONES. SO WE ARE STILL LIKELY TO HAVE A HIGH PROBABILITY OF RAIN
ALTHOUGH NOT COMPLETELY CONFIDENT OF THE LOCATION.  AT PRESENT HAVE
PUT IT OVER THE NORTHERN ZONES.  BEGINNING NEXT WEEK WE SHOULD HAVE
THE SURFACE RIDGE BACK OVER THE AREA.  MORE IMPORTANT THE UPPER
RIDGE THAT HAS BEEN FORCING CHARLEY WEST SHOULD BE WELL IN PLACE
OVER OUR AREA AND WE SHOULD BE JUST A LITTLE BELOW CLIMATE ON THE
PROBABILITIES. AM DISREGARDING ANY POTENTIAL TROPICAL FEATURES
DURING THE EXTENDED PERIOD.
&&

.MARINE...BETWEEN BONNIE AND CHARLEY WE ARE UP TO SMALL CRAFT ON THE
ATLANTIC SIDE. WILL STAY IN THIS SITUATION UNTIL LATE FRIDAY NIGHT
AND THEN SEE A DECREASE TO EXERCISE CAUTION SATURDAY. BY SATURDAY
NIGHT AND THEN THROUGH THE THE REST OF THE FORECAST WE SHOULD BE 15
KNOTS OR LESS.
&&

.FIRE WEATHER...EVEN THOUGH WINDS AND DSI WILL REMAIN HIGH HUMIDITY
VALUES WILL REMAIN ABOVE THE 35 PERCENT THRESHOLD SO NO NEED FOR ANY
ADVISORIES.
&&

.PRELIMINARY POINT TEMPS/POPS...
WEST PALM BEACH 81 90 80 90 / 50 70 50 30
FORT LAUDERDALE 82 90 79 90 / 50 70 50 30
MIAMI           80 90 79 90 / 50 70 50 30
NAPLES          76 90 76 88 / 70 100 70 30
&&

.MFL WATCHES/WARNINGS/ADVISORIES...
FL...HURRICANE WARNING FOR W COLLIER AND MAINLAND MONROE COUNTIES.
     FLOOD WATCH ALL ZONES THROUGH FRIDAY.
     INLAND TROPICAL STORM WIND WATCH GLADES AND HENDRY.
     TROPICAL STORM WATCH LAKE OKEECHOBEE.
AM...SMALL CRAFT ADVISORY ATLC WATERS.
GM...HURRICANE WARNING FOR GULF WATERS.

&&
Hazardous weather outlook, Aug 12, 4:46 PM EDT, 7 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MIAMI FL
446 PM EDT THU AUG 12 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH FLORIDA

FLZ067-068-071>074-130238-
BROWARD METROPOLITAN-DADE METROPOLITAN-PALM BEACH EASTERN-
PALM BEACH WESTERN-WESTERN BROWARD-WESTERN DADE-
446 PM EDT THU AUG 12 2004

.DAY ONE...TONIGHT AND FRIDAY

...FLOOD WATCH IN EFFECT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL MOVE FROM THE SOUTH
OVER THE AREA TONIGHT...ESPECIALLY LATE. SOME OF THE STORMS WILL
BRING STRONG WIND GUSTS TO 35 MPH AND LOCALLY HEAVY RAINFALL.

HEAVY RAINFALL AND STRONG WINDS WILL IMPACT THE AREA FRIDAY AS
HURRICANE CHARLEY MOVES NORTH ALONG THE SOUTHWEST COAST OF FLORIDA.

SEE THE HURRICANE LOCAL STATEMENT AT AFOS PIL MIAHLSMFL, OR WMO
HEADER WTUS82 KMFL, FOR MORE INFORMATION.

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...SATURDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO MONITOR THE WEATHER AND SELF ACTIVATE IF
NEEDED.

FLZ069-070-075-130238-
EASTERN COLLIER-MAINLAND MONROE-WESTERN COLLIER-
446 PM EDT THU AUG 12 2004

.DAY ONE...TONIGHT AND FRIDAY

...HURRICANE WARNING SOUTHWEST FLORIDA COAST...
...FLOOD WATCH IN EFFECT...

HURRICANE CHARLEY WILL MOVE NORTH THROUGH THE GULF WATERS ALONG THE
SOUTHWEST FLORIDA COAST ON FRIDAY. WEATHER WILL GRADUALLY DETERIORATE
OVERNIGHT, WITH HEAVY RAINFALL, INCREASING WINDS, AND MORE
THUNDERSTORM ACTIVITY. THERE MAY BE ISOLATED WEAK TORNADOES AFTER
MIDNIGHT ASSOCIATED WITH THE THUNDERSTORMS, AS CHARLEY NEARS THE
AREA. LOCALIZED FLOODING IS POSSIBLE AS WELL AS RAINFALL INCREASES.

PREPARATIONS NEED TO BE RUSHED TO COMPLETION IN ADVANCE OF THIS
HURRICANE. SEE THE HURRICANE LOCAL STATEMENT AT AFOS PIL MIAHLSMFL,
OR WMO HEADER WTUS82 KMFL, FOR MORE INFORMATION.

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...SATURDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY ON FRIDAY AS CHARLEY MOVES NORTH
ALONG THE GULF COAST OF SOUTHWEST FLORIDA.

FLZ063-066-130238-
GLADES-HENDRY-
446 PM EDT THU AUG 12 2004

.DAY ONE...TONIGHT AND FRIDAY

...INLAND TROPICAL STORM WIND WATCH GLADES AND HENDRY COUNTIES...
...FLOOD WATCH IN EFFECT...

HURRICANE CHARLEY WILL MOVE NORTH THROUGH THE GULF WATERS ALONG THE
SOUTHWEST FLORIDA COAST ON FRIDAY. SUSTAINED TROPICAL STORM FORCE
WINDS ARE POSSIBLE ACROSS GLADES AND HENDRY COUNTIES AT AROUND NOON
ON FRIDAY. FLOODING IS ALSO POSSIBLE. THERE WILL ALSO BE A RISK FOR
WEAK TORNADOES IN THE RAINBANDS OF CHARLEY.

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...SATURDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY ON FRIDAY AS CHARLEY MOVES NORTH
ALONG THE GULF COAST OF SOUTHWEST FLORIDA.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 1:27 AM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade63 min
Aug 13, 1:29 AM EDTSevere Thunderstorm WarningMFLCollier46 min
Aug 13, 2:54 AM EDTSevere Thunderstorm WarningMFLGlades21 min
Aug 13, 8:44 AM EDTTornado WarningMFLCollier, Hendry46 min
Aug 13, 10:54 AM EDTSevere Thunderstorm WarningMFLCollier, Hendry51 min
Aug 13, 10:56 AM EDTSevere Thunderstorm WarningMFLHendry49 min
Aug 13, 11:06 AM EDTTornado WarningMFLHendry39 min
Aug 13, 11:41 AM EDTSpecial Marine WarningMFL64 min
Aug 13, 11:45 AM EDTTornado WarningMFLGlades, Hendry30 min
Aug 13, 12:17 PM EDTTornado WarningMFLGlades43 min
Aug 13, 12:37 PM EDTFlash Flood WarningMFLGlades, Hendry3 hr
Aug 13, 3:05 PM EDTTornado WarningMFLCollier, Hendry25 min

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.