Alert archive / Florida / Tornado Warnings in 2008

Tornado Warning 15, NWS Key West, FL

September 10, 2008Monroe County, Florida

NWS Key West, FL issued this tornado warning at Sep 10, 2008, 3:45 AM EDT for Monroe County, Florida. It was in force for 30 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 10, 2008, 3:45 AM EDT (07:45 UTC)
Expired: Sep 10, 2008, 4:15 AM EDT
In force: 30 min
Issued by: NWS Key West, FL
Area: Storm-based polygon

County Monroe County, FL

The radar

The Miami radar (KAMX), 88 km from the middle of the area, began a volume at 07:49 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 00:00Z, 7.8 hours before the alert went out and 114 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: 3819 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 207 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 
WFUS52 KKEY 100745
TORKEY
FLC087-100815-
/O.NEW.KKEY.TO.W.0015.080910T0745Z-080910T0815Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
345 AM EDT WED SEP 10 2008

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

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

* UNTIL 415 AM EDT

* AT 339 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR OVER     
  HAWK CHANNEL SOUTHEAST OF MATECUMBE KEY...MOVING NORTHWEST AT      
  43 MPH.

LAT...LON 2487 8070 2485 8072 2484 8074 2485 8075
      2486 8075 2488 8071 2490 8070 2488 8069
TIME...MOT...LOC 0744Z 143DEG 37KT 2487 8074

$$

KASPER

2 follow-up statements

000 
WWUS52 KKEY 100804
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
404 AM EDT WED SEP 10 2008

FLC087-100815-
/O.CON.KKEY.TO.W.0015.000000T0000Z-080910T0815Z/
UPPER KEYS IN MONROE FL-
402 AM EDT WED SEP 10 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 AM EDT FOR UPPER
KEYS IN MONROE COUNTY...

AT 358 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR LOWER MATECUMBE 
KEY...MOVING NORTHWEST NEAR 40 MPH.

SEEK SHELTER UNTIL THIS STORM PASSES.

LAT...LON 2487 8070 2485 8072 2484 8074 2485 8075
      2486 8075 2488 8071 2490 8070 2488 8069
TIME...MOT...LOC 0802Z 143DEG 37KT 2502 8086

$$

KASPER

000 
WWUS52 KKEY 100825
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
425 AM EDT WED SEP 10 2008

FLC087-100834-
/O.EXP.KKEY.TO.W.0015.000000T0000Z-080910T0815Z/
UPPER KEYS IN MONROE FL-
424 AM EDT WED SEP 10 2008

...THE TORNADO WARNING FOR UPPER KEYS IN MONROE COUNTY HAS EXPIRED...

HOWEVER...A TORNADO THREAT WILL REMAIN ELEVATED FOR THE NEXT HOUR OR 
TWO AS OUTER RAINBANDS OF HURRICANE IKE MOVE RAPIDLY NORTHWARD OVER 
THE MIDDLE AND UPPER KEYS.

LAT...LON 2487 8070 2485 8072 2484 8074 2485 8075
      2486 8075 2488 8071 2490 8070 2488 8069
TIME...MOT...LOC 0804Z 143DEG 37KT 2504 8087

$$

KASPER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 9, 11:30 PM EDT	Small Craft Advisory	KEY		65 hr
Sep 10, 12:53 AM EDT	Tornado Warning	KEY	Monroe	22 min
Sep 10, 1:05 AM EDT	Special Marine Warning	KEY		85 min
Sep 10, 2:13 AM EDT	Tornado Warning	KEY	Monroe	32 min
Sep 10, 2:27 AM EDT	Special Marine Warning	KEY		63 min
Sep 10, 3:33 AM EDT	Special Marine Warning	KEY		57 min
Sep 10, 4:22 AM EDT	Areal Flood Advisory	KEY	Monroe	3 hr
Sep 10, 4:35 AM EDT	Special Marine Warning	KEY		55 min
Sep 10, 6:54 AM EDT	Special Marine Warning	KEY		111 min
Sep 10, 8:12 AM EDT	Special Marine Warning	KEY		45 min
Sep 10, 5:02 PM EDT	Special Marine Warning	KEY		58 min

Nearby

Tornado Warnings in Florida, 2008 Every tornado warning in 2008 Tornadoes in 2008

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.