Alert archive / Alabama / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 84, NWS Mobile, AL

April 4, 2001Washington County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 4, 2001, 8:58 AM CDT for Washington County, Alabama. It was in force for 32 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Apr 4, 2001, 8:58 AM CDT (13:58 UTC)
Expired: Apr 4, 2001, 9:30 AM CDT
In force: 32 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Washington County, AL

What was reported inside it

Time	Report	Where	Remark
Apr 4, 9:15 AM CDT	Hail 1.75	Millry, AL	Golfball size hail was reported around Millry. No reports of any damage were received.

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.

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

Jackson, MS (KJAN), launched 12:00Z, 2.0 hours before the alert went out and 186 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: 2317 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

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

418 
WUUS54 KMOB 041358
SVRMOB
ALC129-041430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
858 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 930 AM CDT

* AT 858 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES WEST OF HEALING SPRINGS...MOVING EAST
  AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILLRY...KOENTON BY 905 AM CDT
  YARBO BY 910 AM CDT
  BIGBEE...FRANKVILLE BY 915 AM CDT
  ST STEPHENS BY 925 AM CDT

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

LAT...LON 3170 8845 3157 8845 3149 8799 3169 8810

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, 9:01 AM CDT	Severe Thunderstorm Warning	MOB	Butler	19 min
Apr 4, 9:30 AM CDT	Severe Thunderstorm Warning	MOB	Washington	30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.