Alert archive / Florida / Tornado Warnings in 2004

Tornado Warning 1, NWS EYW

April 11, 2004Monroe County, Florida

NWS EYW issued this tornado warning at Apr 11, 2004, 10:26 PM EDT for Monroe County, Florida. It was in force for 34 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
Apr 11, 2004, 10:26 PM EDT (02:26 UTC)
Expired
Apr 11, 2004, 11:00 PM EDT
In force
34 min
Issued by
NWS EYW
Area
Counties, with a storm outline in the text

County Monroe County, FL

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado 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

Key West, FL (KEYW), launched 00:00Z, 2.4 hours before the alert went out and 28 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, Key West, FL at 00:00Z on 2004-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 703 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, Key West, FL at 00:00Z on 2004-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.19395878Sfc1 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
703 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
1251 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

503 
WFUS52 KEYW 120226
TOREYW
FLC087-120300-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
1026 PM EDT SUN APR 11 2004

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* TORNADO WARNING FOR...
  LOWER KEYS IN MONROE COUNTY IN FLORIDA

* UNTIL 1100 PM EDT

* AT 1022 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES
  NORTHWEST OF UPPER SUGARLOAF KEY...OR ABOUT 13 MILES NORTHEAST OF
  KEY WEST...MOVING NORTHEAST AT 20 MPH.

* SOME LOCATIONS NEAR THE PATH OF THE STORM THROUGH 1100 PM EDT...
UPPER SUGARLOAF KEY...BIG COPPITT...AND CUDJOE KEY.

THIS IS A DANGEROUS SITUATION. ACT QUICKLY! IF YOU ARE IN THE PATH OF
THIS TORNADO...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME.

SEEK SHELTER ON THE LOWEST FLOOR OF A BUILDING...IN AN INTERIOR
HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER
YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

RADAR SHOWS STRONG SIGNS THAT A TORNADO IS DEVELOPING - TAKE COVER
NOW!

LAT...LON 2480 8155 2466 8172 2459 8144 2474 8128

$$
FUTTERMAN/FELTGEN

The office that day

Everything else NWS EYW issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 11, 9:57 PM EDTSevere Thunderstorm WarningEYWMonroe63 min

Nearby

Tornado Warnings in Florida, 2004Every tornado warning in 2004Tornadoes 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.