Alert archive / Florida / Flash Flood Warnings in 2003

Flash Flood Warning 1, NWS Tallahassee, FL

March 20, 2003Bay County, Florida

NWS Tallahassee, FL issued this flash flood warning at Mar 20, 2003, 4:44 AM CST for Bay County, Florida. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 20, 2003, 4:44 AM CST (10:44 UTC)
Expired: Mar 20, 2003, 7:45 AM CST
In force: 3 hr
Issued by: NWS Tallahassee, FL
Area: Counties, with a storm outline in the text

County Bay County, FL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 10.7 hours before the alert went out and 121 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: 1137 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 511 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KTAE 201043
FFWTLH
FLC005-201345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
444 AM CST THU MAR 20 2003

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BAY COUNTY IN FLORIDA
  
* UNTIL 745 AM CST

* AT 529 AM EST...A PANAMA CITY REPORTER INDICATED VERY RAIN ACROSS  
  BAY COUNTY...AS MUCH AS 4.5 INCHES OF RAIN OVERNIGHT. FLOODING WAS 
  REPORTED ALONG HIGHWAY 98 WITH SEVERAL CARS FLOATING ON THE ROAD. 
  FLOODING WAS LIKELY ACROSS OTHER ROADS AND IN TOWNS. THEREFORE A   
  FLASH FLOOD WARNING IS IN EFFECT FRO AL OF BAY COUNTY.  

* DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE
  ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
  CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED
  QUICKLY. IT ONLY TAKES A FOOT OR TWO OF FLOWING WATER TO SWEEP MOST
  CARS AWAY. REMEMBER...MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.

LAT...LON 3010 8542 3001 8549 3041 8594 3041 8542

$$

24-BLOCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 19, 11:15 PM CST	Tornado Warning	TAE	Walton	45 min
Mar 19, 11:51 PM CST	Special Marine Warning	TAE		114 min
Mar 20, 1:37 AM CST	Tornado Warning	TAE	Bay	38 min
Mar 20, 2:19 AM CST	Tornado Warning	TAE	Bay, Calhoun, Jackson	41 min
Mar 20, 2:56 AM CST	Tornado Warning	TAE	Jackson	49 min

Nearby

Flash Flood Warnings in Florida, 2003 Every flash flood warning in 2003

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.