Alert archive / Alabama / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 99, NWS Mobile, AL

April 28, 1990Conecuh County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 28, 1990, 12:15 PM CDT for Conecuh County, Alabama. It was in force for 45 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 28, 1990, 12:15 PM CDT (17:15 UTC)
Expired
Apr 28, 1990, 1:00 PM CDT
In force
45 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Conecuh County, AL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Apr 28, 12:30 PM CDTThunderstorm Wind 0Conecuh, AL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Centreville/Bibb, AL (KCKL), launched 12:00Z, 5.3 hours before the alert went out and 165 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, Centreville/Bibb, AL at 12:00Z on 1990-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 75 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, Centreville/Bibb, AL at 12:00Z on 1990-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.193958Sfc1 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
75 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMOB 281715
SVRMOB
ALC035-281800-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1215 PM CDT SAT APR 28 1990
 
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST ALABAMA
 
   ...CONECUH COUNTY
 
AT 1212 PM THE MOBILE RADAR INDICATED A SEVERE THUNDERSTORM 16 MILES
SOUTHWEST OF EVERGREEN MOVING TOWARD THE NORTHEAST AT 30 MPH. THIS
STORM WILL PASS VERY NEAR EVERGREEN AROUND 1230 PM WITH THE
POSSIBILITY OF LARGE HAIL AND DAMAGING WINDS.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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, Apr 28, 10:15 AM CDT, 2 hours before
ALZ013-015-281630-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1010 AM CDT SAT APR 28 1990

...THUNDERSTORMS WITH GUSTY WINDS AND POSSIBLE HAIL FOR CLARKE...
MONROE AND CONECUH COUNTIES OF ALABAMA...

AT 1005 AM A SHORT LINE OF THUNDERSTORMS HAD DEVELOPED NORTHEAST TO
SOUTHWEST ACROSS CLARKE COUNTY ALABAMA.  THE THUNDERSTORMS WERE MOVING
EAST AT 30 MPH.

DURING THE NEXT TWO HOURS THE THUNDERSTORMS WILL CONTINUE TO INTENSIFY
AS %THEY MOVE ACROSS EASTERN CLARKE...MONROE AND CONECUH COUNTIES.
THE STRONGER THUNDERSTORMS WILL PRODUCE STRONG GUSTY WINDS...DANGEROUS
LIGHTNING...BRIEF HEAVY RAINFALL AND POSSIBLY SOME HAIL.
Special weather statement, Apr 28, 11:39 AM CDT, 36 minutes before
FLZ001>004-251200-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE PENSACOLA FL
1130 AM CDT SAT APR 28 1990

AT 1125 AM CDT...PENSACOLA RADAR INDICATED A LINE OF VERY STRONG
THUNDERSTORMS IN EXTREME SOUTH ALABAMA. THE LINE BEGAN NEAR MONTGOMERY
AND EXTENDED SOUTHWEST TO THE WEST END OF ESCAMBIA COUNTY IN ALABAMA.

THE LINE WAS MOVING TO THE SOUTHEAST AROUND 15 MILES AN HOUR. AT THIS
VELOCITY THESE THUNDERSTORMS COULD MOVE INTO NORTHERN ESCAMBIA AND
SANTA ROSA COUNTIES OF FLORIDA DURING THE NEXT ONE TO TWO HOURS.

THESE STORMS MAY EASILY PRODUCE SMALL HAIL AND STRONG GUSTY WINDS IN
ADDITION TO HEAVY RAIN AND FREQUENT LIGHTNING.

PERSONS IN THE PATH OF THIS LINE OF THUNVDERSTORMS SHOULD REMAIN ALERT
FOR THREATENING WEATHER CONDITIONS AND BE PREPARED TO MOVE TO A SAFE
PLACE IF SEVERE WEATHER OCCURS.
Special weather statement, Apr 28, 12:00 PM CDT, 15 minutes before
ALZ015-281800-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
NOON CDT SAT APR 28 1990

...A TORNADO WATCH IS IN EFFECT FOR MONROE...ESCAMBIA AND CONECUH
COUNTIES IN ALABAMA UNTIL 500 PM CDT...

AT 1155 AM THE MOBILE RADAR INDICATED A LINE OF THUNDERSTORMS FROM 15
MILES SOUTH OF MONTGOMERY TO 10 MILES NORTH OF BAY MINETTE.  THE
STRONGEST STORM ALONG THIS LINE IN SOUTHWEST ALABAMA WAS LOCATED 8
MILES NORTH OF ATMORE IN ESCAMBIA COUNTY.  THE THUNDERSTORMS ARE
MOVING TO THE EAST NORTHEAST AT 30 MPH...AND IF THE STORM NORTH OF
ATMORE CONTINUES TO INCREASE RAPIDLY A THUNDERSTORM WARNING MAY BE
NEEDED IN CONECUH COUNTY DURING THE NEXT HOUR.

RESIDENTS IN THE WATCH ARE SHOULD R|EMAIN ALERT FOR THE POSSIBILITY OF
SEVERE WEATHER UNTIL LATER THIS AFTERNOON.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 11:44 AM CDTSevere Thunderstorm WarningMOBButler61 min
Apr 28, 12:29 PM CDTSevere Thunderstorm WarningMOBBullock46 min
Apr 28, 12:49 PM CDTSevere Thunderstorm WarningMOBMacon56 min
Apr 28, 1:04 PM CDTSevere Thunderstorm WarningMOBPike41 min
Apr 28, 1:12 PM CDTSevere Thunderstorm WarningMOBBarbour, Bullock63 min
Apr 28, 1:23 PM CDTSevere Thunderstorm WarningMOBCovington67 min
Apr 28, 1:46 PM CDTSevere Thunderstorm WarningMOBEscambia44 min
Apr 28, 2:19 PM CDTSevere Thunderstorm WarningMOBCoffee56 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.