Alert archive / Alabama / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 77, NWS Birmingham, AL
NWS Birmingham, AL issued this severe thunderstorm warning at May 20, 1990, 8:32 PM CDT for Morgan County, Alabama. It was in force for 43 min.
The area
The counties it named.
The facts
- Issued
- May 20, 1990, 8:32 PM CDT (01:32 UTC)
- Expired
- May 20, 1990, 9:15 PM CDT
- In force
- 43 min
- Issued by
- NWS Birmingham, AL
- Area
- Whole counties
County Morgan County, AL
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 00:00Z, 1.5 hours before the alert went out and 188 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.
- Mixed-layer CAPE
- 107 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 951 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KHSV 210134
SVRHSV
ALC103-210215-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HUNTSVILLE AL
832 PM CDT SUN MAY 20 1990
THE NATIONAL WEATHER SERVICE IN HUNTSVILLE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 915 PM CDT
IN NORTH ALABAMA...
IN NORTH ALABAMA
...MORGAN COUNTY
AT 8;32 THIS EVENING HUNTSVILLE RADAR INDICATED A SEVERE THUNDERSTORM
MOVING OUT OF CULLMAN COUNTY INTO MORGAN COUNTY NEAR EVA. THIS STORM
DOWNED SOME TREES AND POWERLINES NEAR VINEMONT IN CULLMAN COUNTY
AROUND 8:28 THIS EVENING. THIS THUNDERSTORM IS MOVING EAST NORTHEAST
AT 35 MPH.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...{DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 20, 3:03 PM CDT, 5 hours 29 minutes before
ALZ010-011-012-014-202100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MONTGOMERY AL 300 PM CDT SUN MAY 20 1990 ...ALL WATCHES AND WARNINGS FOR ALABAMA HAVE EXPIRED OR ARE CANCELLED AT T.HIS TIME... AT 300 PM CDT RADAR SHOWED THE THUNDERSTORM ACTIVITY HAS DIMINISHED OVER ALABAMA. ONLY ISOLATED SHOWERS AND THUNDERSHOWERS EXISTED OVER THE STATE. MOVEMENT WAS EAST AT AROUND 30 MPH.
Special weather statement, May 20, 3:06 PM CDT, 5 hours 26 minutes before
ALZ010-011-012-014-202100- SPECIAL WEATHER STATEMENT CORRECTION NATIONAL WEATHER SERVICE MONTGOMERY AL 300 PM CDT SUN MAY 20 1990 ...ALL SEVERE THUNDERSTORM WATCHES AND WARNINGS FOR ALABAMA HA1VE EXPIRED OR ARE CANCELLED AT THIS TIME... AT 300 PM CDT RADAR SHOWED THE THUNDERSTORM ACTIVITY HAS DIMINISHED OVER ALABAMA. ONLY ISOLATED SHOWERS AND THUNDERSHOWERS EXISTED OVER THE STATE. MOVEMENT WAS EAST AT AROUND 30 MPH.
Special weather statement, May 20, 5:35 PM CDT, 2 hours 57 minutes before
ALZ010-014-202330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MONTGOMERY AL 529 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH #285 REMAINS IN EFFECT FOR MUCH OF CENTRAL AND SOUTH CENTRAL ALABAMA UNTIL 10 PM CDT... AT 525 PM CDT NATIONAL WEATHER SERVICE RADAR AT MONTGOMERY SHOWED THUNDERSTORMS WITH VERY HEAVY RAIN MOVING EAST NORTHEAST ALONG THE DALLAS-PERRY COUNTY BORDER SOUTHEAST OF MARION. THE THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS...DANGEROUS LIGHTNING AND SOME SMALL HAIL HAS BEEN REPORTED. ANOTHER THUNDERSTORM WITH MODERATE RAINFALL WAS LOCATED ABOUT 20 MILES SOUTHWEST OF SELMA ON THE ALABAMA RIVER. THE THUNDERSTORMS WERE MOVING EASTNORTHEAST AT ABOUT 25 MILES AN HOUR. THE THUNDERSTORMS EAST OF MONTGOMERY HAVE DISSIPATED. PERSONS IN SOUTH CENTRAL ALABAMA SHOULD STAY TUNED FOR LATER DEVELOPMENTS IN THIS WEATHER SITUATION. SNELL
Special weather statement, May 20, 6:43 PM CDT, 1 hour 49 minutes before
ALZ010-012-014-017-210045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MONTGOMERY AL 639 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH #285 IN EFFECT UNTIL 10 PM CDT FOR CENTRAL AND SOUTH CENTRAL ALABAMA... THUNDERSTORMS HAVE CONTINUED TO GROW AND DISSIPATE IN SOUTH CENTRAL ALABAMA ALABAMA. AT 630 PM CDT MONTGOMERY WEATHER RADAR SHOWED SEVERAL THUNDERSTORMS WITH VERY HEAVY RAIN AND POSSIBLY SOME SMALL HAIL. THE STRONGEST THUNDERSTORM WAS OVER PRATTVILLE. THE THUNDERSTORMS ARE MOVING EASTNORTHEAST AT ABOUT 25 MILES AN HOUR. OTHER THUNDERSTORMS WERE OBSERVED OVER SOUTHEAST MONTGOMERY COUNTY AND NORTH OF TROY IN NORTHERN PIKE COUNTY. RESIDENTS SHOULD CONTINUE TO MONITOR NOAA WEATHER RADIO FOR LATER DEVELOPMENTS IN THIS WEATHER SITUATION. SNELL
Special weather statement, May 20, 7:55 PM CDT, 37 minutes before
ALZ010-011-012-014-017-018-212245 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MONTGOMERY AL 749 PM CDT SUN MAY 20 1990 ...SEVERE THUNDERSTORM WATCH #285 IN EFFECT UNTIL 10 PM CDT FOR CENTRAL ALABAMA... ...SEVERE THUNDERSTORM WATCH #286 IN EFFECT UNTIL 1 AM CDT FOR ALL OF EASTERN ALABAMA... A LINE OF THUNDERSTORMS HAS DEVELOPED AND INCREASED IN STRENGTH AND IS MOVING TOWARD SOUTH CENTRAL ALABAMA AT THIS TIME. THE LINE STRETCHES FROM FROM WEST OF DALLAS COUNTY ACROSS THE NORTHWEST AND NORTHERN CORNER OF DALLAS COUNTY AND ALONG THE CHILTON-AUTAUGA COUNTY LINE JUST SHORT OF COOSA COUNTY. THESE THUNDERSTORMS HAVE BECOME MORE ORGANIZED AND ARE MOVING DUE EAST AT ABOUT 25-35 MILES AN HOUR. THEY WILL BE ACCOMPANIED BY STRONG GUSTY WINDS...VERY HEAVY RAIN...DANGEROUS LIGHTNING AND SOME HAIL. PERSONS IN SOUTH CENTRAL ALABAMA SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS. PERSONS IN DALLAS AND WILCOX COUNTIES SHOCULD STAY TUNED TO NOAA WEATHER RADIO FOR POSSIBLE WARNINGS IN THIS POTENTIALLY DANGEROUS WEATHER SITUATION. NOW IS A GOOD TIME TO REVIEW SAFETY PROCEEDURES FOR SEVERE THUNDERSTORMS AND TORNADOES. SNELL
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:01 PM CDT | Flash Flood Warning | BMX | Tuscaloosa | 59 min |
| May 20, 7:06 PM CDT | Severe Thunderstorm Warning | BMX | Lawrence | 39 min |
| May 20, 7:34 PM CDT | Severe Thunderstorm Warning | BMX | Limestone, Morgan | 26 min |
| May 20, 7:55 PM CDT | Severe Thunderstorm Warning | BMX | Madison | 35 min |
| May 21, 7:24 AM CDT | Severe Thunderstorm Warning | BMX | Colbert, Franklin, Lauderdale | 36 min |
| May 21, 8:36 AM CDT | Severe Thunderstorm Warning | BMX | Lamar | 54 min |
| May 21, 9:34 AM CDT | Severe Thunderstorm Warning | BMX | Pickens | 41 min |
| May 21, 10:59 AM CDT | Severe Thunderstorm Warning | BMX | Pickens | 46 min |
| May 21, 11:18 AM CDT | Severe Thunderstorm Warning | BMX | Chilton, Shelby | 57 min |
| May 21, 11:32 AM CDT | Severe Thunderstorm Warning | BMX | Greene | 58 min |
| May 21, 11:37 AM CDT | Severe Thunderstorm Warning | BMX | Talladega | 38 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 1990Every severe thunderstorm warning in 1990
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.