Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 145, NWS Mobile, AL

April 27, 2017Choctaw County, Alabama; Wayne County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 27, 2017, 1:00 AM CDT for Choctaw County, Alabama; Wayne County, Mississippi. It was in force for 60 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 27, 2017, 1:00 AM CDT (06:00 UTC)
Expired: Apr 27, 2017, 2:00 AM CDT
In force: 60 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Choctaw County, AL, Wayne County, MS

The radar

The Mobile radar (KMOB), 148 km from the middle of the area, began a volume at 06:03 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

Jackson, MS (KJAN), launched 00:00Z, 6.0 hours before the alert went out and 174 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: 448 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1294 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

580 
WUUS54 KMOB 270600
SVRMOB
ALC023-MSC153-270700-
/O.NEW.KMOB.SV.W.0145.170427T0600Z-170427T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
100 AM CDT THU APR 27 2017

The National Weather Service in Mobile has issued a

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

* Until 200 AM CDT

* At 100 AM CDT, severe thunderstorms were located along a line
  extending from near Alamucha to near Ellisville, moving east at 45
  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...
  Waynesboro, Butler, Clara, Lisman, Pennington, Gilbertown and
  Toxey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3231 8793 3228 8793 3230 8794 3230 8798
      3228 8802 3217 8801 3209 8804 3205 8812
      3200 8810 3200 8809 3170 8843 3170 8846
      3166 8846 3156 8858 3154 8894 3182 8894
      3185 8865 3190 8847 3231 8842
TIME...MOT...LOC 0600Z 256DEG 41KT 3234 8844 3159 8926 

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

3 follow-up statements

147 
WWUS54 KMOB 270635
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
135 AM CDT THU APR 27 2017

ALC023-MSC153-270700-
/O.CON.KMOB.SV.W.0145.000000T0000Z-170427T0700Z/
Choctaw AL-Wayne MS-
135 AM CDT THU APR 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR CHOCTAW AND WAYNE COUNTIES...

At 135 AM CDT, severe thunderstorms were located along a line
extending from near Lisman to 8 miles northwest of Waynesboro, moving
east at 45 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...
Waynesboro, Butler, Clara, Lisman, Pennington, Gilbertown and Toxey. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3231 8793 3228 8793 3230 8794 3230 8798
      3228 8802 3217 8801 3209 8804 3205 8812
      3200 8810 3200 8809 3170 8843 3170 8846
      3166 8846 3156 8858 3154 8894 3174 8894
      3185 8865 3190 8847 3201 8846 3231 8830
TIME...MOT...LOC 0635Z 258DEG 38KT 3222 8823 3175 8875 

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

826 
WWUS54 KMOB 270650
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
150 AM CDT THU APR 27 2017

MSC153-270659-
/O.CAN.KMOB.SV.W.0145.000000T0000Z-170427T0700Z/
Wayne MS-
150 AM CDT THU APR 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR WAYNE COUNTY IS CANCELLED...

The storms which prompted the warning have weakened, therefore, the 
warning has been cancelled.

LAT...LON 3231 8793 3228 8793 3230 8794 3230 8798
      3228 8802 3217 8801 3209 8804 3205 8812
      3200 8810 3200 8809 3193 8816 3188 8840
      3187 8847 3201 8846 3231 8830
TIME...MOT...LOC 0649Z 252DEG 38KT 3228 8804 3191 8846 

$$

ALC023-270700-
/O.CON.KMOB.SV.W.0145.000000T0000Z-170427T0700Z/
Choctaw AL-
150 AM CDT THU APR 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM CDT
FOR CHOCTAW COUNTY...

At 149 AM CDT, severe thunderstorms were located along a line
extending from near Pennington to 6 miles southeast of Crandall,
moving east at 45 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...
Butler, Lisman, Pennington and Toxey. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3231 8793 3228 8793 3230 8794 3230 8798
      3228 8802 3217 8801 3209 8804 3205 8812
      3200 8810 3200 8809 3193 8816 3188 8840
      3187 8847 3201 8846 3231 8830
TIME...MOT...LOC 0649Z 252DEG 38KT 3228 8804 3191 8846 

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

078 
WWUS54 KMOB 270701
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
201 AM CDT THU APR 27 2017

ALC023-270711-
/O.EXP.KMOB.SV.W.0145.000000T0000Z-170427T0700Z/
Choctaw AL-
201 AM CDT THU APR 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR CHOCTAW COUNTY HAS EXPIRED...
    
The storms which prompted the warning have weakened below severe 
limits, therefore the warning has been allowed to expire.

LAT...LON 3231 8793 3228 8793 3230 8794 3230 8798
      3228 8802 3217 8801 3209 8804 3205 8812
      3200 8810 3200 8809 3193 8816 3188 8840
      3187 8847 3201 8846 3231 8830
TIME...MOT...LOC 0701Z 256DEG 41KT 3231 8789 3194 8831 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 2:03 AM CDT	Special Weather Statement	MOB	Choctaw	27 min
Apr 27, 2:53 AM CDT	Special Weather Statement	MOB	Clarke, Washington	67 min
Apr 27, 2:58 AM CDT	Severe Thunderstorm Warning	MOB	Wilcox	34 min
Apr 27, 3:50 AM CDT	Severe Thunderstorm Warning	MOB	Clarke, Wilcox	24 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Severe Thunderstorm Warnings in Mississippi, 2017 Every severe thunderstorm warning in 2017

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.