Alert archive / Florida / Tornado Warnings in 2008

Tornado Warning 6, NWS Key West, FL

August 30, 2008Monroe County, Florida

NWS Key West, FL issued this tornado warning at Aug 30, 2008, 7:31 PM EDT for Monroe County, Florida. It was in force for 29 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 30, 2008, 7:31 PM EDT (23:31 UTC)
Expired
Aug 30, 2008, 8:00 PM EDT
In force
29 min
Issued by
NWS Key West, FL
Area
Storm-based polygon

County Monroe County, FL

The radar

The Key West radar (KBYX), 41 km from the middle of the area, began a volume at 23:33 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 watch it was issued in

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

IssuedProductOfficeLasted
Aug 30, 5:05 PM EDTTornado WatchSPC9 hr

The nearest sounding before it

Key West, FL (KEYW), launched 12:00Z, 11.5 hours before the alert went out and 45 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 12:00Z on 2008-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1273 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Key West, FL at 12:00Z on 2008-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.193958Sfc1 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
1273 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
1055 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
119 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 302331
TORKEY
FLC087-310000-
/O.NEW.KKEY.TO.W.0006.080830T2331Z-080831T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
731 PM EDT SAT AUG 30 2008

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

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

* UNTIL 800 PM EDT

* AT 728 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  VIOLENT WATERSPOUT NEAR BAHIA HONDA KEY...OR 10 MILES SOUTHWEST OF
  MARATHON...MOVING NORTHWEST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
  BAHIA HONDA KEY AND OHIO KEY BY 735 PM EDT...
  BIG PINE KEY...MIDDLE TORCH KEY AND LITTLE TORCH KEY BY 745 PM
  EDT...

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. THIS
STORM IS CAPABLE OF PRODUCING STRONG TO VIOLENT TORNADOES. IF YOU ARE
IN THE PATH OF THIS TORNADO...TAKE COVER IMMEDIATELY

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT SUNDAY MORNING FOR
CENTRAL FLORIDA.

LAT...LON 2472 8146 2477 8136 2476 8133 2481 8129
      2478 8125 2474 8129 2472 8128 2469 8129
      2470 8125 2466 8123 2462 8133
TIME...MOT...LOC 2330Z 128DEG 40KT 2462 8121

$$

04
2 follow-up statements
000 
WWUS52 KKEY 302348
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
748 PM EDT SAT AUG 30 2008

FLC087-310000-
/O.CON.KKEY.TO.W.0006.000000T0000Z-080831T0000Z/
LOWER KEYS IN MONROE FL-
746 PM EDT SAT AUG 30 2008

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR LOWER
KEYS IN MONROE COUNTY...

AT 745 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR NO NAME KEY...OR
15 MILES WEST OF MARATHON...MOVING NORTHWEST AT 25 MPH.

TORNADOES ASSOCIATED WITH TROPICAL CYCLONES MOVE RAPIDLY...ARE OFTEN 
WRAPPED IN HEAVY RAIN...AND ARE DIFFICULT TO SEE OR HEAR UNTIL THEY 
ARE VERY CLOSE.

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION.
IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO 
THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT SUNDAY MORNING FOR
CENTRAL FLORIDA.

LAT...LON 2472 8146 2477 8136 2476 8133 2481 8129
      2478 8125 2474 8129 2472 8128 2469 8129
      2470 8125 2466 8123 2462 8133
TIME...MOT...LOC 2346Z 128DEG 40KT 2473 8136

$$

04
000 
WWUS52 KKEY 310000
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
800 PM EDT SAT AUG 30 2008

FLC087-310008-
/O.EXP.KKEY.TO.W.0006.000000T0000Z-080831T0000Z/
LOWER KEYS IN MONROE FL-
800 PM EDT SAT AUG 30 2008

...THE TORNADO WARNING FOR LOWER KEYS IN MONROE COUNTY EXPIRES AT 
800 PM EDT...

THE STORM THAT PROMPTED THE TORNADO WARNING IN THE LOWER KEYS...NEAR 
NO NAME KEY AND BIG PINE KEY...HAS WEAKENED AND MOVED OFF TO THE 
NORTHWEST. THE TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM EDT SUNDAY MORNING FOR
CENTRAL FLORIDA.

LAT...LON 2472 8146 2477 8136 2476 8133 2481 8129
      2478 8125 2474 8129 2472 8128 2469 8129
      2470 8125 2466 8123 2462 8133
TIME...MOT...LOC 2358Z 128DEG 40KT 2481 8148

$$

04

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 12:11 AM EDTTropical Storm WarningKEY41 hr
Aug 30, 3:13 AM EDTSpecial Marine WarningKEY62 min
Aug 30, 5:39 AM EDTSpecial Marine WarningKEY51 min
Aug 30, 6:28 AM EDTSpecial Marine WarningKEY47 min
Aug 30, 9:34 AM EDTSpecial Marine WarningKEY26 min
Aug 30, 10:04 AM EDTSpecial Marine WarningKEY26 min
Aug 30, 10:45 AM EDTSpecial Marine WarningKEY49 min
Aug 30, 11:42 AM EDTSpecial Marine WarningKEY78 min
Aug 30, 12:37 PM EDTTropical Storm WarningKEYMonroe26 hr
Aug 30, 1:17 PM EDTSpecial Marine WarningKEY118 min
Aug 30, 2:24 PM EDTTornado WarningKEYMonroe21 min
Aug 30, 3:22 PM EDTSpecial Marine WarningKEY113 min
Aug 30, 5:19 PM EDTSpecial Marine WarningKEY116 min
Aug 30, 7:17 PM EDTSpecial Marine WarningKEY118 min
Aug 30, 7:39 PM EDTTornado WarningKEYMonroe19 min

Nearby

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