Alert archive / Alabama / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 30, NWS Mobile, AL

January 30, 1999Choctaw County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jan 30, 1999, 3:08 PM CST for Choctaw County, Alabama. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 30, 1999, 3:08 PM CST (21:08 UTC)
Expired: Jan 30, 1999, 4:15 PM CST
In force: 67 min
Issued by: NWS Mobile, AL
Area: Whole counties

County Choctaw County, AL

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 9.1 hours before the alert went out and 174 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 287 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.

999 
WUUS1 KMOB 302110 RRA
SVRMOB
ALC023-302215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
308 PM CST SAT JAN 30 1999

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHOCTAW COUNTY IN SOUTHWESTERN ALABAMA

* UNTIL 415 PM CST

* AT 303 PM CST...AS INDICATED BY DOPPLER RADAR A SEVERE THUNDERSTORM
  WAS LOCATED 10 MILES WEST OF LISMAN... MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL REACH THE VICINITY OF -
  LISMAN BY 325 PM CST
  CROMWELL BY 325 PM CST
  LAVACA BY 345 PM CST
  PENNINGTON BY 350 PM CST

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 DO NOT 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.

NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 30, 2:53 PM CST, 15 minutes earlier.

Area forecast discussion, Jan 30, 2:53 PM CST, 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
253 PM CST SAT JAN 30 1999

SFC LO CURRENTLY NEAR TX/OK/AR BDR WITH COLD FRONT EXTENDING S
INTO THE GULF FM NEAR INTERCOASTAL CITY LA AND WARM FRONT EXTENDING
SEWD ACRS CNTRL MS/AL.  SATELLITE IMAGERY SHOWS CONSIDERABLE CLRG OVR
SW-S CNTRL LA AS AMPLE DRY AIR ADVECTS IN BEHIND THE CF.  UPPER
CUTOFF LOW CURRENTLY LOCATED OVER N CENTRAL TX WILL MAKE SLOW
PROGRESSION NEWD...HOWEVER SPD MAX CRNTLY PULLING ARND BASE OF LOW
WILL CONT TO HELP DRIVE THE CF AND DRIER AIR EWD...PUSHING INTO THE
FA TNGT AND EAST OF THE AREA SUN MRNG.  STRONG CONVERGENCE AND
ABUNDANT GULF MOISTURE OUT AHEAD OF THE FNT WILL CONT TO SUPPORT
WIDEPSREAD CONVECTION WITH THREAT OF HVY RAINS THRU THIS EVNG.
HOWEVER...PROGRESSION OF FNT/DRY AIR AS INDICATED BY LATEST SATL LOOP
WOULD SUGGEST THE HVY RAIN THREAT WILL BE DIMINISHED BY THIS EVNG OVR
THE SE MS COUNTIES AND SHRTLY AFTER MIDNGT OVR THE SW AL AND NW FL
COUNTIES.  WOULD SUGGEST DROPPING SE MS COUNTIES FM FFA FOR TNGT BUT
KEEP THE CRNT AL COUNTIES IN THRU TNGT JUST IN CASE THE CF AND SURGE
OF DRY AIR GETS STALLED OVR THE ERN SECTIONS OF THE FCST AREA.  ATTM
EXPECT THE FNT/DRY AIR TO PUSH EAST OF THE FA BY 15Z SUN MRNG...
WARRANTING LOWERING OF SUN-SUN NGT POPS.

CUD SEE SOME ISOLATED SVR THIS AFTN/EVNG BUT LIMITED INSTABILITIES
AND SATURATED AIRMASS WILL HINDER WIDESPREAD POTENTIAL.  SHUD BE ABLE
TO HANDLE SVR THREAT WITHOUT A WATCH.

LEANING TWRD NGM GUIDENCE TMPS BUT LIKE TREND OF LOWER AVN POPS FM
SECOND PERIOD ONWARD.

COASTAL WATERS...TROF AXIS MVG IN FM THE WEST SHUD KEEP WNDS AND SEAS
IN CHECK AND KEEP AREA UNDER SCA CRITERIA TNGT.  HOWEVER...15-20KT SE
WINDS AND 3-6 FT SEAS AND NUMEROUS TSTMS MVG ACRS TNT WOULD WARRANT
SCEC.  EXPECT WNDS TO SHIFT SW-W OVR WRN SECTIONS TNGT THEN OVR ERN
SECTIONS BY MID SUN MRNG WITH SCT TSTMS/SHWRS DIMINSHING ERLY SUN.

MOB 57/65/53/64 9421  PNS 58/65/55/64 9521
DTS 59/65/55/64 9532  GZH 57/64/52/62 9421 39/77

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 30, 11:35 AM CST	Flash Flood Warning	MOB	Choctaw	2 hr
Jan 30, 12:01 PM CST	Flash Flood Warning	MOB	Washington	2 hr
Jan 30, 12:18 PM CST	Flash Flood Warning	MOB	Clarke	2 hr
Jan 30, 2:55 PM CST	Flash Flood Warning	MOB	Choctaw, Washington	95 min
Jan 30, 4:41 PM CST	Flash Flood Warning	MOB	Choctaw, Washington	79 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1999 Every severe thunderstorm 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.