Alert archive / Alabama / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Mobile, AL

April 9, 2021Clarke County, Monroe County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 9, 2021, 7:45 AM CDT for Clarke County, Monroe County, Alabama. It was in force for 21 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: Apr 9, 2021, 7:45 AM CDT (12:45 UTC)
Expired: Apr 9, 2021, 8:06 AM CDT
In force: 21 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clarke County, AL, Monroe County, AL

The radar

The Mobile radar (KMOB), 121 km from the middle of the area, began a volume at 12:48 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

Birmingham, AL (KBMX), launched 12:00Z, 0.8 hours before the alert went out and 189 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: 89 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1321 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

109 
WUUS54 KMOB 091245
SVRMOB
ALC025-099-091330-
/O.NEW.KMOB.SV.W.0049.210409T1245Z-210409T1330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
745 AM CDT Fri Apr 9 2021

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  North central Monroe County in south central Alabama...
  East central Clarke County in southwestern Alabama...

* Until 830 AM CDT.

* At 745 AM CDT, a severe thunderstorm was located 4 miles southwest
  of Grove Hill, moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Grove Hill and Whatley. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3162 8796 3175 8795 3176 8749 3172 8747
      3162 8746 3154 8750
TIME...MOT...LOC 1245Z 273DEG 20KT 3168 8785 

HAIL...1.00IN
WIND...60MPH
 
$$

Black

1 follow-up statement

511 
WWUS54 KMOB 091306
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
806 AM CDT Fri Apr 9 2021

ALC025-099-091316-
/O.CAN.KMOB.SV.W.0049.000000T0000Z-210409T1330Z/
Monroe AL-Clarke AL-
806 AM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MONROE AND EAST
CENTRAL CLARKE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail is
still possible with this thunderstorm.

LAT...LON 3162 8796 3175 8795 3176 8749 3172 8747
      3162 8746 3154 8750
TIME...MOT...LOC 1302Z 273DEG 20KT 3167 8771 

$$

Black

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 10:33 PM CDT	Small Craft Advisory	MOB		41 hr
Apr 9, 2:57 AM CDT	Severe Thunderstorm Warning	MOB	Mobile	34 min
Apr 9, 3:30 AM CDT	Special Weather Statement	MOB	Mobile	45 min
Apr 9, 3:57 AM CDT	Special Marine Warning	MOB		93 min
Apr 9, 4:17 AM CDT	Special Weather Statement	MOB	Mobile	58 min
Apr 9, 4:25 AM CDT	Special Marine Warning	MOB		2 hr
Apr 9, 6:28 AM CDT	Special Marine Warning	MOB		2 hr
Apr 9, 6:42 AM CDT	Special Marine Warning	MOB		2 hr
Apr 9, 6:47 AM CDT	Special Weather Statement	MOB	Clarke	43 min
Apr 9, 6:54 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke	38 min
Apr 9, 7:02 AM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	43 min
Apr 9, 8:06 AM CDT	Special Weather Statement	MOB	Clarke	39 min
Apr 9, 8:09 AM CDT	Special Marine Warning	MOB		96 min
Apr 9, 8:28 AM CDT	Special Marine Warning	MOB		105 min
Apr 9, 9:49 AM CDT	Special Marine Warning	MOB		54 min
Apr 9, 12:18 PM CDT	High Surf Advisory	MOB	Baldwin, Mobile	43 hr
Apr 9, 12:23 PM CDT	Special Weather Statement	MOB	Wilcox	52 min
Apr 9, 2:16 PM CDT	Special Weather Statement	MOB	Wilcox	44 min
Apr 9, 2:18 PM CDT	Special Weather Statement	MOB	Choctaw	42 min
Apr 9, 2:35 PM CDT	Special Weather Statement	MOB	Choctaw	40 min
Apr 9, 2:56 PM CDT	Special Weather Statement	MOB	Crenshaw	49 min

Nearby

Severe Thunderstorm Warnings in Alabama, 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.