Alert archive / Alabama / Flash Flood Warnings in 1999

Flash Flood Warning 13, NWS Birmingham, AL

May 6, 1999DeKalb County, Alabama

NWS Birmingham, AL issued this flash flood warning at May 6, 1999, 1:47 AM CDT for DeKalb County, Alabama. 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 counties it named.

The facts

Issued
May 6, 1999, 1:47 AM CDT (06:47 UTC)
Expired
May 6, 1999, 4:50 AM CDT
In force
3 hr
Issued by
NWS Birmingham, AL
Area
Whole counties

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 06:47 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

Birmingham, AL (KBMX), launched 00:00Z, 6.8 hours before the alert went out and 168 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, Birmingham, AL at 00:00Z on 1999-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1931 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, Birmingham, AL at 00:00Z on 1999-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 316 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
1931 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
316 m²/s²
0-3 km storm-relative helicity
395 m²/s²
Significant tornado parameter
3.8
Supercell composite
21.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBHM 060648
FFWBHM
ALC049-060950-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
147 AM CDT THU MAY 6 1999

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DEKALB COUNTY... IN NORTHERN ALABAMA

* UNTIL 450 AM CDT

* AT 140 AM CDT... RADAR INDICATED NUMEROUS SHOWERS AND THUNDERSTORMS
WITH VERY HEAVY RAIN ACROSS DEKALB COUNTY.  THESE SHOWERS AND
THUNDERSTORMS WERE MOVING EAST AT 20 TO 30 MPH.

* LAW ENFORCEMENT REPORTS STREET FLOODING IN THE FORT PAYNE AREA.
  LOCALLY HEAVY RAINFALL WILL CONTINUE AS THE THUNDERSTORMS
  CONTINUE TO MOVE ACROSS THE AREA.

DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!


&

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 5, 8:06 PM CDTSevere Thunderstorm WarningBMXColbert, Lauderdale49 min
May 5, 8:28 PM CDTSevere Thunderstorm WarningBMXFranklin47 min
May 5, 8:50 PM CDTSevere Thunderstorm WarningBMXMarion45 min
May 5, 8:53 PM CDTSevere Thunderstorm WarningBMXColbert, Lauderdale47 min
May 5, 9:14 PM CDTSevere Thunderstorm WarningBMXFranklin, Lawrence61 min
May 5, 9:24 PM CDTSevere Thunderstorm WarningBMXLimestone51 min
May 5, 9:30 PM CDTSevere Thunderstorm WarningBMXLamar, Marion50 min
May 5, 9:53 PM CDTSevere Thunderstorm WarningBMXMorgan62 min
May 5, 9:58 PM CDTSevere Thunderstorm WarningBMXMadison62 min
May 5, 10:02 PM CDTSevere Thunderstorm WarningBMXCullman, Winston63 min
May 5, 10:32 PM CDTSevere Thunderstorm WarningBMXJackson63 min
May 5, 11:03 PM CDTSevere Thunderstorm WarningBMXMadison32 min
May 5, 11:25 PM CDTSevere Thunderstorm WarningBMXLamar30 min
May 5, 11:54 PM CDTSevere Thunderstorm WarningBMXLamar31 min
May 6, 12:06 AM CDTSevere Thunderstorm WarningBMXFayette, Walker64 min
May 6, 12:06 AM CDTSevere Thunderstorm WarningBMXCullman, Winston64 min
May 6, 12:19 AM CDTFlash Flood WarningBMXMorgan3 hr
May 6, 12:27 AM CDTFlash Flood WarningBMXMadison3 hr
May 6, 12:37 AM CDTSevere Thunderstorm WarningBMXPickens48 min
May 6, 12:52 AM CDTSevere Thunderstorm WarningBMXJackson48 min
May 6, 12:57 AM CDTSevere Thunderstorm WarningBMXDeKalb63 min
May 6, 1:11 AM CDTSevere Thunderstorm WarningBMXTuscaloosa64 min
May 6, 1:36 AM CDTSevere Thunderstorm WarningBMXJefferson, Walker64 min
May 6, 1:51 AM CDTSevere Thunderstorm WarningBMXBlount64 min
May 6, 2:16 AM CDTSevere Thunderstorm WarningBMXTuscaloosa44 min
May 6, 3:10 AM CDTSevere Thunderstorm WarningBMXPerry65 min
May 6, 3:46 AM CDTSevere Thunderstorm WarningBMXSt. Clair49 min
May 6, 4:15 AM CDTSevere Thunderstorm WarningBMXCalhoun50 min
May 6, 4:38 AM CDTSevere Thunderstorm WarningBMXCherokee, Cleburne62 min
May 6, 5:31 AM CDTSevere Thunderstorm WarningBMXClay, Randolph49 min
May 6, 6:12 AM CDTSevere Thunderstorm WarningBMXChambers, Tallapoosa63 min
May 6, 6:21 AM CDTSevere Thunderstorm WarningBMXRandolph49 min
May 6, 6:23 AM CDTSevere Thunderstorm WarningBMXMarengo52 min
May 6, 6:32 AM CDTSevere Thunderstorm WarningBMXPerry48 min
May 6, 7:17 AM CDTSevere Thunderstorm WarningBMXElmore63 min
May 6, 7:52 AM CDTSevere Thunderstorm WarningBMXDallas, Lowndes63 min
May 6, 8:22 AM CDTSevere Thunderstorm WarningBMXChambers33 min
May 6, 8:45 AM CDTSevere Thunderstorm WarningBMXMontgomery45 min
May 6, 9:54 AM CDTSevere Thunderstorm WarningBMXLee46 min
May 6, 12:23 PM CDTTornado WarningBMXBarbour47 min

Nearby

Flash Flood Warnings in Alabama, 1999Every flash flood warning in 1999

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.