Alert archive / Alabama / Flash Flood Warnings in 1997

Flash Flood Warning 30, NWS Birmingham, AL

July 21, 1997Greene County, Hale County, Tuscaloosa County, Alabama

NWS Birmingham, AL issued this flash flood warning at Jul 21, 1997, 7:43 PM CDT for Greene County, Hale County, Tuscaloosa County, Alabama. It was in force for 4 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 21, 1997, 7:43 PM CDT (00:43 UTC)
Expired
Jul 21, 1997, 11:40 PM CDT
In force
4 hr
Issued by
NWS Birmingham, AL
Area
Whole counties

Counties Greene County, AL, Hale County, AL, Tuscaloosa County, AL

The radar

The Birmingham radar (KBMX), 90 km from the middle of the area, began a volume at 00:45 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, 0.7 hours before the alert went out and 89 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 1997-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 810 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 1997-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
810 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
487 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
38 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 220043
FFWBHM
ALC063-065-125-220440-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
743 PM CDT MON JUL 21 1997

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM AL HAS EXTENDED THE
FLASH FLOOD WARNING UNTIL 1140 PM CDT

FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN WEST CENTRAL ALABAMA

   ...GREENE COUNTY
   ...HALE COUNTY
   ...TUSCALOOSA COUNTY
 
AT 740 PM CDT...WEATHER RADARS CONTINUED TO SHOW A LARGE AREA OF
RAIN...MIXED WITH A FEW THUNDERSTORMS...ACROSS PARTS OF SOUTHERN
TUSCALOOSA COUNTY AND THE NORTH PARTS OF HALE AND GREENE COUNTIES.
THE RAIN WAS ROTATING AROUND A LOW PRESSURE SYSTEM...THE REMNANTS OF
HURRICANE DANNY...LOCATED JUST NORTH OF EUTAW IN GREENE COUNTY.  THE
AREA OF LOW PRESSURE SHOWED LITTLE MOVEMENT.  AS A RESULT...HEAVY
RAIN CONTINUE TO FALL ACROSS PARTS OF NORTHERN GREENE AND HALE
COUNTIES.  BANDS OF HEAVY RAINFALL WERE MOVING ACROSS PARTS OF
TUSCALOOSA COUNTY...INCLUDING THE CITY OF TUSCALOOSA...COMPOUNDING
THE ALREADY SATURATED CONDITIONS.

ADDITIONAL RAINFALL AMOUNTS OF TWO TO FOUR INCHES ARE POSSIBLE ACROSS
PARTS OF GREENE...HALE AND TUSCALOOSA COUNTIES THROUGH 1130 PM.
 
DURING HEAVY RAINS... KEEP CHILDREN AWAY FROM STORM DRAINS...
WATER CATCHMENTS... AND WATERWAYS. SHALLOW... GENTLY FLOWING WATER
CAN BECOME A RAGING TORRENT IN A MATTER OF MINUTES.

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 AND THE ROAD BENEATH MAY NOT BE INTACT. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. IT ONLY TAKES
A FOOT OR TWO OF FLOWING WATER TO WASH MOST CARS AWAY. REMEMBER...
MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES.

THE WARNING EXTENDS THE PREVIOUS WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 11:41 PM CDTFlash Flood WarningBMXGreene, Hale, Tuscaloosa3 hr
Jul 22, 12:54 AM CDTFlash Flood WarningBMXPickens4 hr
Jul 22, 2:51 PM CDTTornado WarningBMXLee34 min
Jul 22, 2:56 PM CDTTornado WarningBMXChambers29 min
Jul 22, 3:33 PM CDTFlash Flood WarningBMXGreene, Marengo3 hr
Jul 22, 3:41 PM CDTTornado WarningBMXRussell34 min
Jul 22, 5:18 PM CDTFlash Flood WarningBMXBullock2 hr

Nearby

Flash Flood Warnings in Alabama, 1997Every flash flood warning in 1997

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.