Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 115, NWS Mobile, AL

May 4, 2021Choctaw County, Clarke County, Washington County, Alabama; Wayne County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at May 4, 2021, 3:55 PM CDT for Choctaw County, Clarke County, Washington County, Alabama; Wayne County, Mississippi. It was in force for 65 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 4, 2021, 3:55 PM CDT (20:55 UTC)
Expired: May 4, 2021, 5:00 PM CDT
In force: 65 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Choctaw County, AL, Clarke County, AL, Washington County, AL, Wayne County, MS

The radar

The Mobile radar (KMOB), 148 km from the middle of the area, began a volume at 20:57 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.

What was reported inside it

Time	Report	Where	Remark
May 4, 4:50 PM CDT	TSTM WND DMG	Butler, AL	MULTIPLE TREES AND POWER LINES DOWN ACROSS CHOCTAW COUNTY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 4, 9:18 AM CDT	Tornado Watch	SPC	7 hr
May 4, 3:31 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.9 hours before the alert went out and 178 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: 2428 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 13.2

Open this sounding in Storm Lab

The text

As transmitted.

695 
WUUS54 KMOB 042055
SVRMOB
ALC023-025-129-MSC153-042200-
/O.NEW.KMOB.SV.W.0115.210504T2055Z-210504T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
355 PM CDT Tue May 4 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Choctaw County in southwestern Alabama...
  Northwestern Washington County in southwestern Alabama...
  Northwestern Clarke County in southwestern Alabama...
  Wayne County in southeastern Mississippi...

* Until 500 PM CDT.

* At 354 PM CDT, severe thunderstorms were located along a line
  extending from 4 miles east of Suqualena to 3 miles northwest of
  Paulding to 5 miles south of Turnerville to near Mount Olive,
  moving east at 70 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Waynesboro, Butler, Chatom, Clara, Lisman, Millry, State Line,
  Buckatunna, Silas, Coffeeville, Pennington, Gilbertown and Toxey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for southwestern
Alabama...and southeastern Mississippi.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3231 8819 3230 8796 3230 8800 3209 8804
      3206 8807 3206 8812 3201 8811 3199 8807
      3199 8777 3197 8776 3143 8818 3143 8894
      3182 8894 3185 8865 3190 8847 3231 8842
TIME...MOT...LOC 2054Z 280DEG 60KT 3246 8874 3207 8907 3195 8918 3174
8962

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Black

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 4:23 AM CDT	Flash Flood Watch	MOB	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	33 hr
May 4, 10:18 AM CDT	River Flood Warning	MOB	Choctaw, Clarke, Washington	21 days
May 4, 10:19 AM CDT	River Flood Warning	MOB	Clarke, Washington	5 days
May 4, 4:44 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	61 min
May 4, 4:59 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington, Wilcox	61 min
May 4, 5:33 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Clarke, Conecuh, Monroe, Wilcox	57 min
May 4, 5:44 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Mobile, Monroe, Washington	61 min
May 4, 6:28 PM CDT	Severe Thunderstorm Warning	MOB	Butler, Conecuh, Covington, Crenshaw, Monroe, Wilcox	77 min
May 4, 6:45 PM CDT	Special Weather Statement	MOB	Conecuh, Mobile	45 min
May 4, 10:17 AM CDT	River Flood Warning	MOB	George, Greene, Wayne	3 days

Nearby

Severe Thunderstorm Warnings in Alabama, 2021 Severe Thunderstorm Warnings in Mississippi, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.