Alert archive / Florida / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 101, NWS Miami, FL

October 20, 2004Broward County, Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Oct 20, 2004, 4:58 PM EDT for Broward County, Palm Beach County, Florida. It was in force for 62 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: Oct 20, 2004, 4:58 PM EDT (20:58 UTC)
Expired: Oct 20, 2004, 6:00 PM EDT
In force: 62 min
Issued by: NWS Miami, FL
Area: Counties, with a storm outline in the text

Counties Broward County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 88 km from the middle of the area, began a volume at 21:00 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.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 9.0 hours before the alert went out and 62 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: 1803 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KMFL 202058
SVRMIA
FLC011-099-202200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
458 PM EDT WED OCT 20 2004

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BROWARD COUNTY 
  SOUTHEASTERN PALM BEACH COUNTY 
  IN SOUTH FLORIDA

* UNTIL 600 PM EDT

* AT 450 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DIME SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM HIGHLAND BEACH TO PARKLAND...OR ALONG A
  LINE EXTENDING FROM DELRAY BEACH TO 6 MILES NORTHEAST OF CORAL
  SPRINGS...AND MOVING SOUTHEAST AT 5 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  HIGHLAND BEACH BY 505 PM EDT
  PARKLAND BY 510 PM EDT
  BOCA RATON AND FAU SOUTH CAMPUS BY 515 PM EDT
  CORAL SPRINGS BY 520 PM EDT
  COCONUT CREEK BY 530 PM EDT
  DEERFIELD BEACH BY 540 PM EDT

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.

SEVERE THUNDERSTORMS CAN 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.

LAT...LON 2651 8003 2638 8037 2609 8013 2623 7979

$$

PFOST

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 20, 2:47 PM EDT	Special Marine Warning	MFL		43 min
Oct 20, 3:06 PM EDT	Special Marine Warning	MFL		39 min
Oct 20, 3:17 PM EDT	Special Marine Warning	MFL		43 min
Oct 20, 3:45 PM EDT	Special Marine Warning	MFL		60 min
Oct 20, 3:45 PM EDT	Special Marine Warning	MFL		60 min
Oct 20, 3:51 PM EDT	Special Marine Warning	MFL		54 min
Oct 20, 4:40 PM EDT	Special Marine Warning	MFL		65 min
Oct 20, 5:34 PM EDT	Tornado Warning	MFL	Broward	26 min
Oct 20, 5:55 PM EDT	Special Marine Warning	MFL		65 min
Oct 20, 5:58 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	62 min

Nearby

Severe Thunderstorm Warnings in Florida, 2004 Every 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.