Alert archive / Alabama / Flash Flood Warnings in 1999

Flash Flood Warning 53, NWS Birmingham, AL

July 11, 1999Chambers County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 11, 1999, 10:26 PM CDT for Chambers 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
Jul 11, 1999, 10:26 PM CDT (03:26 UTC)
Expired
Jul 12, 1999, 1:30 AM CDT
In force
3 hr
Issued by
NWS Birmingham, AL
Area
Whole counties

County Chambers County, AL

The radar

The Maxwell AFB radar (KMXX), 56 km from the middle of the area, began a volume at 03:28 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 3.4 hours before the alert went out and 97 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 110 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, Peachtre/Fal Fld, GA at 00:00Z on 1999-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
110 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
1045 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
14 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 
TTAA00 KBHM 120326
FFWBHM
ALC017-120630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1026 PM CDT SUN JUL 11 1999

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A...

* FLASH FLOOD WARNING FOR...
  CHAMBERS COUNTY... IN EAST CENTRAL ALABAMA.

* UNTIL 130 AM CDT

* AT 1025 AM CDT...WEATHER RADAR SHOWED HEAVY RAINFALL ACROSS THE
  NORTHERN SECTIONS OF CHAMBERS COUNTY.  RADAR RAINFALL ESTIMATES OF
  ABOUT 2 INCHESv SINCE 8 PM.  ADDITIONAL RAINFALL AMOUNTS OF ONE TO
  THREE INCHES CAN BE EXPECTED THROUGH MIDNIGHT.

  DON'T DRIVE ACROSS FLOODED ROADS! MOST FLASH FLOOD DEATHS OCCUR IN
  AUTOMOBILES.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 10:19 PM CDTFlash Flood WarningBMXRandolph3 hr
Jul 11, 11:18 PM CDTFlash Flood WarningBMXPike3 hr

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.