Alert archive / Alabama / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 113, NWS Mobile, AL

April 17, 1998Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 17, 1998, 9:24 PM CDT for Washington County, Alabama. It was in force for 61 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: Apr 17, 1998, 9:24 PM CDT (02:24 UTC)
Expired: Apr 17, 1998, 10:25 PM CDT
In force: 61 min
Issued by: NWS Mobile, AL
Area: Whole counties

County Washington County, AL

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 17, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.4 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-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: 624 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 311 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

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

718 
WUUS1 KMOB 180225 RRA
SVRMOB
ALC129-180325-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
924 PM CDT FRI APR 17 1998

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN WASHINGTON COUNTY IN SOUTHWESTERN ALABAMA

* UNTIL 1025 PM CDT

* AT 923 PM CDT... A SEVERE THUNDERSTORM WAS LOCATED 10 MILES WEST OF
  CHATOM OR 9 MILES WEST OF YARBO... AS INDICATED BY DOPPLER RADAR...
  MOVING EAST 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR-
  LOPER AT 930 PM CDT
  YARBO AT 930 PM CDT
  BIGBEE AT 940 PM CDT
  ST STEPHENS AT 950 PM CDT
  LEROY AT 950 PM CDT

IF YOU ARE CAUGHT OUTSIDE...SEEK REFUGE FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:03 PM CDT	Tornado Warning	MOB	Clarke	47 min
Apr 17, 7:15 PM CDT	Tornado Warning	MOB	Escambia	60 min
Apr 17, 7:23 PM CDT	Tornado Warning	MOB	Baldwin, Monroe	32 min
Apr 17, 7:44 PM CDT	Tornado Warning	MOB	Covington	61 min
Apr 17, 7:48 PM CDT	Severe Thunderstorm Warning	MOB	Washington	62 min
Apr 17, 8:21 PM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Escambia	44 min
Apr 17, 8:41 PM CDT	Severe Thunderstorm Warning	MOB	Covington	64 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1998 Every 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.