Alert archive / Alabama / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 86, NWS Mobile, AL

April 4, 2001Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 4, 2001, 9:30 AM CDT for Washington County, Alabama. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Apr 4, 2001, 9:30 AM CDT (14:30 UTC)
Expired: Apr 4, 2001, 10:00 AM CDT
In force: 30 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

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 4, 6:00 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.5 hours before the alert went out and 197 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: 1686 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 588 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KMOB 041429
SVRMOB

ALC129-041500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
930 AM CDT WED APR 4 2001

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN SOUTHWEST ALABAMA

* UNTIL 1000 AM CDT

* AT 928 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 6 MILES SOUTHWEST OF YARBO TO
  NEAR LEROY...MOVING SOUTHEAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  CHATOM...CARSON BY 940 AM CDT
  CORTELUOU...WAGARVILLE BY 945 AM CDT
  SUNFLOWER BY 955 AM CDT
  TIBBIE...TOINETTE BY 1000 AM CDT

STRONG DAMAGING WIND...LARGE HAIL...AND HEAVY RAIN ARE LIKELY WITH
THESE STORMS.  IF IN THE PATH OF THESE STORMS...TAKE COVER IN A
STURDY SHELTER UNTIL THE STORMS HAVE PASSED.

LAT...LON 3156 8845 3154 8799 3143 8793 3131 8796
          3130 8833

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 3, 7:08 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	17 min
Apr 3, 7:22 PM CDT	Severe Thunderstorm Warning	MOB	Washington	23 min
Apr 3, 9:31 PM CDT	Flash Flood Warning	MOB	Clarke, Washington	89 min
Apr 3, 9:40 PM CDT	Severe Thunderstorm Warning	MOB	Monroe	35 min
Apr 4, 6:50 AM CDT	Severe Thunderstorm Warning	MOB	Clarke, Marengo	25 min
Apr 4, 7:50 AM CDT	Flash Flood Warning	MOB	Marengo	85 min
Apr 4, 8:15 AM CDT	Flash Flood Warning	MOB	Choctaw	90 min
Apr 4, 8:58 AM CDT	Severe Thunderstorm Warning	MOB	Washington	32 min
Apr 4, 9:01 AM CDT	Severe Thunderstorm Warning	MOB	Butler	19 min
Apr 4, 9:45 AM CDT	Flash Flood Warning	MOB	Choctaw	90 min
Apr 4, 12:36 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	24 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2001 Every severe thunderstorm warning in 2001

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.