Alert archive / Georgia / Flash Flood Warnings in 2002

Flash Flood Warning 12, NWS Tallahassee, FL

September 15, 2002Seminole County, Georgia

NWS Tallahassee, FL issued this flash flood warning at Sep 15, 2002, 12:28 AM EDT for Seminole County, Georgia. It was in force for 92 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 15, 2002, 12:28 AM EDT (04:28 UTC)
Expired: Sep 15, 2002, 2:00 AM EDT
In force: 92 min
Issued by: NWS Tallahassee, FL
Area: Counties, with a storm outline in the text

County Seminole County, GA

The radar

The Tallahassee radar (KTLH), 80 km from the middle of the area, began a volume at 04:28 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.5 hours before the alert went out and 81 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: 1 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 186 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 
WGUS52 KTAE 150428
FFWTLH
GAC253-150600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1224 AM EDT SUN SEP 15 2002

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SEMINOLE COUNTY IN GEORGIA
  THIS INCLUDES DONALSONVILLE

* UNTIL 200 AM EDT

* AT 1216 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED A BAND OF VERY HEAVY RAINFALL MOVING EAST-NORTHEAST AT   
  30 MPH INTO SEMINOLE COUNTY. RADAR ESTIMATES INDICATE THAT AN      
  ADDITIONAL 3 TO 5 INCHES OF RAIN MAY FALL DURING THE NEXT COUPLE   
  OF HOURS OVER MUCH OF THE COUNTY WHICH MAY CAUSE SIGNIFICANT       
  FLOODING OF ROADWAYS AND LOW LYING AREAS.

* 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 3105 8478 3083 8477 3078 8494 3106 8499

.END

17-GOULD

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 1:04 AM EDT	Flash Flood Warning	TAE	Baker, Early, Miller	116 min
Sep 15, 2:37 AM EDT	Flash Flood Warning	TAE	Early	83 min
Sep 15, 3:06 AM EDT	Flash Flood Warning	TAE	Seminole	114 min
Sep 15, 4:11 AM EDT	Tornado Warning	TAE	Miller, Seminole	29 days
Sep 15, 5:05 AM EDT	Flash Flood Warning	TAE	Miller, Seminole	115 min

Nearby

Flash Flood Warnings in Georgia, 2002 Every flash flood warning in 2002

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.