Alert archive / Florida / Tornado Warnings in 2024

Tornado Warning 5, NWS Key West, FL

September 25, 2024Monroe County, Florida

NWS Key West, FL issued this tornado warning at Sep 25, 2024, 5:40 PM EDT for Monroe County, Florida. It was in force for 20 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: Sep 25, 2024, 5:40 PM EDT (21:40 UTC)
Expired: Sep 25, 2024, 6:00 PM EDT
In force: 20 min
Issued by: NWS Key West, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Monroe County, FL

The radar

The Key West radar (KBYX), 11 km from the middle of the area, began a volume at 21:43 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

Key West, FL (KEYW), launched 12:00Z, 9.7 hours before the alert went out and 15 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: 654 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

415 
WFUS52 KKEY 252140
TORKEY
FLC087-252200-
/O.NEW.KKEY.TO.W.0005.240925T2140Z-240925T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Key West FL
540 PM EDT Wed Sep 25 2024

The National Weather Service in Key West has issued a

* Tornado Warning for...
  Lower Keys in Monroe County in Florida...

* Until 600 PM EDT.

* At 540 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Bay Point, or near Big Coppitt Key, moving
  northwest at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Big Coppitt Key, Saddlebunch Keys, Bay Point, Shark Key, and 
  Sugarloaf Key around 545 PM EDT.

This includes US 1 between mile markers 11 and 17. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 2470 8173 2473 8168 2470 8162 2476 8160
      2459 8154 2456 8162
TIME...MOT...LOC 2140Z 149DEG 34KT 2459 8159 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

NB

1 follow-up statement

260 
WWUS52 KKEY 252151
SVSKEY

Severe Weather Statement
National Weather Service Key West FL
551 PM EDT Wed Sep 25 2024

FLC087-252201-
/O.EXP.KKEY.TO.W.0005.000000T0000Z-240925T2200Z/
Lower Keys in Monroe FL-
551 PM EDT Wed Sep 25 2024

...THE TORNADO WARNING FOR LOWER KEYS IN MONROE COUNTY WILL EXPIRE AT
600 PM EDT...

The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However, gusty
winds and heavy rain are still possible with this thunderstorm.

&&

LAT...LON 2470 8173 2473 8168 2470 8162 2476 8160
      2459 8154 2456 8162
TIME...MOT...LOC 2151Z 149DEG 34KT 2465 8163 

$$

NB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 1:53 AM EDT	Special Marine Warning	KEY		17 min
Sep 25, 2:21 AM EDT	Special Marine Warning	KEY		24 min
Sep 25, 5:17 AM EDT	Areal Flood Advisory	KEY	Monroe	118 min

Nearby

Tornado Warnings in Florida, 2024 Every tornado warning in 2024 Tornadoes in 2024

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.