Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 126, NWS Mobile, AL

May 12, 2021Covington County, Alabama; Okaloosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at May 12, 2021, 6:29 AM CDT for Covington County, Alabama; Okaloosa County, Florida. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 12, 2021, 6:29 AM CDT (11:29 UTC)
Expired: May 12, 2021, 7:33 AM CDT
In force: 64 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Covington County, AL, Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 75 km from the middle of the area, began a volume at 11:32 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 11.5 hours before the alert went out and 222 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: 1708 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

713 
WUUS54 KMOB 121129
SVRMOB
ALC039-FLC091-121245-
/O.NEW.KMOB.SV.W.0126.210512T1129Z-210512T1245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
629 AM CDT Wed May 12 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Southern Covington County in south central Alabama...
  Northern Okaloosa County in northwestern Florida...

* Until 745 AM CDT.

* At 628 AM CDT, severe thunderstorms were located along a line
  extending from 14 miles northwest of Laurel Hill to near Baker,
  moving east at 70 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Crestview, Florala, Baker, Laurel Hill and Lockhart. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3099 8625 3099 8639 3065 8639 3079 8679
      3086 8679 3100 8674 3100 8669 3101 8670
      3113 8670 3131 8664 3123 8619 3119 8619
TIME...MOT...LOC 1128Z 256DEG 71KT 3111 8663 3083 8671 

HAIL...<.75IN
WIND...60MPH
 
$$

1 follow-up statement

347 
WWUS54 KMOB 121233
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
733 AM CDT Wed May 12 2021

ALC039-FLC091-121242-
/O.CAN.KMOB.SV.W.0126.000000T0000Z-210512T1245Z/
Covington AL-Okaloosa FL-
733 AM CDT Wed May 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN COVINGTON AND
NORTHERN OKALOOSA COUNTIES IS CANCELLED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.  However heavy rain is
still possible.

LAT...LON 3099 8625 3099 8639 3065 8639 3079 8679
      3086 8679 3100 8674 3100 8669 3101 8670
      3113 8670 3131 8664 3123 8619 3119 8619
TIME...MOT...LOC 1231Z 256DEG 71KT 3140 8522 3113 8530 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 2:55 AM CDT	Special Weather Statement	MOB	Washington	65 min
May 12, 3:31 AM CDT	Special Weather Statement	MOB	Baldwin, Mobile	44 min
May 12, 3:46 AM CDT	Flash Flood Warning	MOB	Clarke, Washington	4 hr
May 12, 4:06 AM CDT	Special Weather Statement	MOB	Baldwin, Mobile	54 min
May 12, 4:12 AM CDT	Areal Flood Advisory	MOB	Baldwin, Mobile	3 hr
May 12, 4:20 AM CDT	Special Marine Warning	MOB		85 min
May 12, 4:41 AM CDT	Special Marine Warning	MOB		94 min
May 12, 4:56 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	24 min
May 12, 5:01 AM CDT	Areal Flood Advisory	MOB	Baldwin, Escambia	3 hr
May 12, 5:04 AM CDT	Special Weather Statement	MOB	Baldwin, Escambia	86 min
May 12, 6:01 AM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Covington, Escambia	44 min
May 12, 6:24 AM CDT	Special Marine Warning	MOB		96 min
May 12, 6:35 AM CDT	Special Marine Warning	MOB		55 min
May 12, 6:52 AM CDT	Areal Flood Advisory	MOB	Conecuh, Covington, Escambia	3 hr
May 12, 6:56 AM CDT	Severe Thunderstorm Warning	MOB	Covington, Crenshaw	35 min
May 12, 7:18 AM CDT	Special Marine Warning	MOB		87 min
May 12, 6:11 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	49 min
May 12, 6:21 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	69 min
May 12, 6:41 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	79 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2021 Severe Thunderstorm Warnings in Florida, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.