Alert archive / Florida / Tornado Watches in 2005

Tornado Watch 837

October 23, 200530 counties in Florida

The Storm Prediction Center issued this tornado watch at Oct 23, 2005, 9:25 PM EDT for 30 counties in Florida. It was in force for 14 hr.

The area

The outline as issued.

The facts

Issued
Oct 23, 2005, 9:25 PM EDT (01:25 UTC)
Expired
Oct 24, 2005, 11:00 AM EDT
In force
14 hr
Issued by
the Storm Prediction Center
All 30 counties

Brevard County, FL, Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 111 km from the middle of the area, began a volume at 01:25 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.

Warnings issued inside it

20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Oct 23, 9:41 PM EDTTornado WarningMLBBrevard49 min
Oct 23, 10:04 PM EDTTornado WarningTBWPolk26 min
Oct 23, 10:49 PM EDTTornado WarningMLBLake56 min
Oct 23, 11:42 PM EDTTornado WarningMLBLake63 min
Oct 24, 12:38 AM EDTTornado WarningEYWMonroe52 min
Oct 24, 1:26 AM EDTTornado WarningMLBOrange49 min
Oct 24, 2:14 AM EDTTornado WarningMFLCollier53 min
Oct 24, 2:45 AM EDTTornado WarningMLBOsceola45 min
Oct 24, 3:50 AM EDTTornado WarningMLBOsceola40 min
Oct 24, 3:50 AM EDTTornado WarningTBWPolk25 min
Oct 24, 4:26 AM EDTTornado WarningMLBBrevard34 min
Oct 24, 4:36 AM EDTTornado WarningTBWPolk24 min
Oct 24, 4:45 AM EDTTornado WarningMFLCollier, Monroe91 min
Oct 24, 5:18 AM EDTTornado WarningMLBOrange, Osceola42 min
Oct 24, 5:49 AM EDTTornado WarningTBWHighlands26 min
Oct 24, 6:01 AM EDTTornado WarningMLBOrange, Osceola44 min
Oct 24, 6:55 AM EDTTornado WarningMLBBrevard65 min
Oct 24, 7:40 AM EDTTornado WarningMLBBrevard, Indian River50 min
Oct 24, 7:52 AM EDTTornado WarningMLBOsceola38 min
Oct 24, 10:26 AM EDTFlash Flood WarningMLBBrevard, Orange, Osceola4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 1.4 hours before the alert went out and 111 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, Tampa Bay, FL at 00:00Z on 2005-10-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 511 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, Tampa Bay, FL at 00:00Z on 2005-10-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
511 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
774 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 240129
SEL7  
SPC WW 240129
FLZ000-CWZ000-241500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 837
NWS STORM PREDICTION CENTER NORMAN OK
925 PM EDT SUN OCT 23 2005

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       CENTRAL AND SOUTHERN FLORIDA
       COASTAL WATERS

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 925 PM UNTIL
1100 AM EDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE MILES
EITHER SIDE OF A LINE FROM 45 MILES WEST NORTHWEST OF ORLANDO
FLORIDA TO 80 MILES SOUTH OF MIAMI FLORIDA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU7).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 836. WATCH NUMBER 836 WILL NOT BE IN EFFECT AFTER 925
PM EDT. 

DISCUSSION...HURRICANE WILMA WILL BE CROSSING SRN FL LATER TONIGHT
AND MON AM.  STRONG SHEAR ALREADY IN PLACE ACROSS SRN FL AND WILL
ONLY INCREASE AS WILMA APPROACHES. WITH 0OZ SRN FL SOUNDINGS
INDICATING A MDTLY UNSTABLE TROPICAL AIR MASS...THE TORNADO
POTENTIAL EXPECTED TO INCREASE REMAINDER OF THE NIGHT AS SHEAR
BECOMES VERY STRONG.

THE FORECAST MAXIMUM WIND GUSTS AND MEAN CELL MOTION APPLY TO SEVERE
THUNDERSTORMS OUTSIDE THE HURRICANE EYEWALL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 18045.


...HALES

291,0805 250,0790 241,0812 282,0830

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 23, 8:48 PM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 20 more117 min
Oct 23, 11:13 PM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 21 more2 hr
Oct 24, 4:28 AM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 24 more107 min
Oct 24, 8:16 AM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 16 more89 min
Oct 24, 10:57 AM EDTMesoscale DiscussionSPCBrevard, Indian River63 min

Nearby

Tornado Watches in Florida, 2005Every tornado watch in 2005

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.