Alert archive / Alabama / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 5, NWS Mobile, AL

January 7, 1998Baldwin County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Jan 7, 1998, 5:50 AM CST for Baldwin County, Alabama. It was in force for 55 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 7, 1998, 5:50 AM CST (11:50 UTC)
Expired
Jan 7, 1998, 6:45 AM CST
In force
55 min
Issued by
NWS Mobile, AL
Area
Whole counties

County Baldwin County, AL

The radar

The Mobile radar (KMOB), 47 km from the middle of the area, began a volume at 11:52 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jan 7, 4:00 AM CSTTornado WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.8 hours before the alert went out and 192 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, Slidell Radar S, LA at 00:00Z on 1998-01-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Slidell Radar S, LA at 00:00Z on 1998-01-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 319 square meters per square second.19395878Sfc1 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
4 J/kg
Mixed-layer CIN
-252 J/kg
Mixed-layer LCL
768 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
319 m²/s²
0-3 km storm-relative helicity
407 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

200 
WUUS1 KMOB 071151 RRA
SVRMOB
ALC003-071245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
550 AM CST WED JAN 7 1998
 
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  645 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST ALABAMA
 
   ...BALDWIN COUNTY
 
AT 550 AM CST...MOBILE DOPPLER WEATHER RADAR INDICATED A POWERFUL LINE
OF THUNDERSTORMS WHICH WILL BEGIN TO ADVANCE INTO WESTERN BALDWIN COUNTY
BY 6 AM...AND AFFECT THE TOWNS OF STOCKTON AND TENSAW BY 620 AM...AND
BAY MINETTE BY 630 AM. WIND GUSTS IN EXCESS OF 45 MPH HAVE BEEN REPORTED
WITH THESE THUNDERSTORMS.
 
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.

NWS Mobile, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 7, 3:17 AM CST, 2 hours 33 minutes earlier.

Area forecast discussion, Jan 7, 3:17 AM CST, 2 hours 33 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MOBILE AL
315 AM WED JAN 7 1998

HEAVY RAINS EXPECTED ACROSS ENTIRE FA UP THRU MID TO LATE AFT TODAY
AS DEVELOPING SFC LOW MOVES INLAND OVR THE CSTL LA AND MS. AS UPPER
TROF DEEPENS OVR CENTRL TX TODAY EXPECT SFC LOW TO PUSH NNE MOVING
INTO THE TN VAL BY TONIGHT. LATEST AVN AND ETA FILES SHOW BEST LIFT
AND MOISTURE OVR THE REGION UP THROUGH 18Z TODAY WITH 50KT LOW LEVL
JET DEVLOPING AROUND 12Z ALONG THE AL AND NWFL CST. WITH THIS AND
SOME MID LEVL DRYING BY MIDDAY COULD SEE SOME STRONGER... POSSIBLY
SEVERE...TS DEVELOPING NEAR THE CST BEFORE MOST OF THE THIS PRECIP
PULLS OUT LATER THIS AFT. ALSO...EXPECT SOME PROBLEMS BEFORE ITS ALL
OVER W/ ONE HR TOTALS BELOW 2 INCHES IN SOME AREAS FOR FLOODING TO
OCCUR. BEST CHANCE FOR FLASH FLOODING W/ BE FROM WASHINGTON TO
CHOCTAW COS IN AL AND ALL OF SE MS. LATEST FCST LOOKS TO BE ON TRACK
THOUGH POPS MAY NEED TO BE LOWERED SLIGHTLY FOR TONIGHT AND THU WITH
BETTER CLDS RETURNING NEAR THE FRNT ON THU.

OVER THE COASTAL WATERS...SELY WINDS INCREASING TO 20 TO 25 KT AS LOW
LEVL JET DEVELOPES ALONG THE CST BECOMING SW TONIGHT. COULD SEE SOME
STRONG TS OVER THE GULF BEFORE ITS ALL OVR WITH WINDS UP TO OR
EXCEEDING GALE FORCE. WENT TO 8 FT ON THE SEAS LATE IN THE PD. LATEST
MODEL RUNS INDICATING BETTER FLOW FROM THE W THEN NW AFTER FROPA.

MOB 67/57/65/40 +431 PNS 69/59/64/46 +531
DTS 68/62/65/48 +531 EVR 66/57/63/39 +451 32

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 7, 4:55 AM CSTSevere Thunderstorm WarningMOBMobile65 min
Jan 7, 6:00 AM CSTSevere Thunderstorm WarningMOBMobile60 min
Jan 7, 6:38 AM CSTFlash Flood WarningMOBChoctaw, Mobile, Washington3 hr
Jan 7, 7:10 AM CSTSevere Thunderstorm WarningMOBChoctaw20 min
Jan 7, 7:39 AM CSTFlash Flood WarningMOBBaldwin3 hr
Jan 7, 7:53 AM CSTTornado WarningMOBBaldwin52 min
Jan 7, 7:57 AM CSTSevere Thunderstorm WarningMOBEscambia63 min
Jan 7, 8:08 AM CSTSevere Thunderstorm WarningMOBMonroe67 min
Jan 7, 8:33 AM CSTSevere Thunderstorm WarningMOBConecuh57 min
Jan 7, 9:01 AM CSTSevere Thunderstorm WarningMOBWilcox59 min
Jan 7, 9:05 AM CSTSevere Thunderstorm WarningMOBEscambia60 min
Jan 7, 9:40 AM CSTSevere Thunderstorm WarningMOBCovington60 min
Jan 7, 9:45 AM CSTFlash Flood WarningMOBChoctaw, Mobile, Washington3 hr
Jan 7, 10:09 AM CSTSevere Thunderstorm WarningMOBButler61 min
Jan 7, 10:38 AM CSTFlash Flood WarningMOBEscambia112 min
Jan 7, 10:43 AM CSTSevere Thunderstorm WarningMOBCovington62 min
Jan 7, 10:55 AM CSTFlash Flood WarningMOBBaldwin110 min
Jan 7, 4:41 PM CSTFlash Flood WarningMOBBaldwin5 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 1998Every severe thunderstorm warning in 1998

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.