Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 151, NWS Mobile, AL

April 30, 2017Choctaw County, Clarke County, Washington County, Alabama; Wayne County, Mississippi

NWS Mobile, AL issued this severe thunderstorm warning at Apr 30, 2017, 1:06 PM CDT for Choctaw County, Clarke County, Washington County, Alabama; Wayne County, Mississippi. It was in force for 39 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 30, 2017, 1:06 PM CDT (18:06 UTC)
Expired: Apr 30, 2017, 1:45 PM CDT
In force: 39 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Mobile radar (KMOB), 144 km from the middle of the area, began a volume at 18:07 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 10:36 AM CDT	Tornado Watch	SPC	8 hr
Apr 30, 7:32 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 6.1 hours before the alert went out and 183 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: 647 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 920 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 398 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

976 
WUUS54 KMOB 301806
SVRMOB
ALC023-025-129-MSC153-301845-
/O.NEW.KMOB.SV.W.0151.170430T1806Z-170430T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mobile AL
106 PM CDT SUN APR 30 2017

The National Weather Service in Mobile has issued a

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

* Until 145 PM CDT

* At 105 PM CDT, severe thunderstorms were located along a line
  extending from near Putnam to near State Line, moving east at 25
  mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Waynesboro, Thomasville, Butler, Chatom, Saint Stephens, Clara,
  Lisman, Millry, Buckatunna, Silas, Coffeeville, Pennington,
  Gilbertown and Toxey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 300 PM CDT for southeastern
Mississippi. A tornado watch also remains in effect until 700 PM CDT
for southwestern Alabama.

LAT...LON 3215 8802 3214 8804 3211 8805 3209 8804
      3206 8807 3207 8810 3205 8812 3202 8812
      3199 8810 3201 8809 3199 8807 3199 8769
      3147 8802 3144 8845 3144 8884 3187 8857
      3190 8847 3204 8846 3221 8835 3223 8801
TIME...MOT...LOC 1805Z 264DEG 24KT 3208 8809 3146 8844 

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

1 follow-up statement

079 
WWUS54 KMOB 301839
SVSMOB

Severe Weather Statement
National Weather Service Mobile AL
139 PM CDT SUN APR 30 2017

ALC023-025-129-MSC153-301845-
/O.CON.KMOB.SV.W.0151.000000T0000Z-170430T1845Z/
Choctaw AL-Washington AL-Clarke AL-Wayne MS-
139 PM CDT SUN APR 30 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR CHOCTAW...NORTHERN WASHINGTON...NORTHWESTERN CLARKE AND
SOUTHEASTERN WAYNE COUNTIES...

At 138 PM CDT, severe thunderstorms were located along a line 
extending from near Putnam to near Chatom, moving east at 20 mph.  A 
new severe thunderstorm warning may be issued soon for much of this 
area.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Thomasville, Butler, Chatom, Saint Stephens, Millry, Buckatunna,
Silas, Coffeeville, Pennington, Gilbertown and Toxey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 300 PM CDT for southeastern
Mississippi. A tornado watch also remains in effect until 700 PM CDT
for southwestern Alabama.

LAT...LON 3215 8802 3214 8804 3211 8805 3209 8804
      3206 8807 3207 8810 3205 8812 3202 8812
      3199 8810 3201 8809 3199 8807 3199 8769
      3147 8802 3144 8845 3144 8861 3183 8848
      3188 8842 3201 8835 3222 8818 3223 8801
TIME...MOT...LOC 1838Z 276DEG 18KT 3195 8807 3147 8822 

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 12:02 PM CDT	Special Weather Statement	MOB	Choctaw	58 min
Apr 30, 12:46 PM CDT	Areal Flood Advisory	MOB	Choctaw, Washington	3 hr
Apr 30, 1:02 PM CDT	Severe Thunderstorm Warning	MOB	Washington	58 min
Apr 30, 1:46 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	59 min
Apr 30, 2:00 PM CDT	Severe Thunderstorm Warning	MOB	Clarke, Mobile, Washington	60 min
Apr 30, 2:50 PM CDT	Special Weather Statement	MOB	Wilcox	40 min
Apr 30, 3:03 PM CDT	Special Weather Statement	MOB	Mobile	57 min
Apr 30, 3:14 PM CDT	Areal Flood Advisory	MOB	Clarke, Mobile, Washington, Wilcox	3 hr
Apr 30, 3:56 PM CDT	Special Weather Statement	MOB	Mobile, Monroe	64 min
Apr 30, 4:01 PM CDT	Special Marine Warning	MOB		89 min
Apr 30, 4:09 PM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Apr 30, 4:24 PM CDT	Special Weather Statement	MOB	Escambia	51 min
Apr 30, 4:43 PM CDT	Special Weather Statement	MOB	Baldwin, Mobile	62 min
Apr 30, 5:23 PM CDT	Special Marine Warning	MOB		52 min
Apr 30, 5:38 PM CDT	Special Weather Statement	MOB	Baldwin	67 min
Apr 30, 5:48 PM CDT	Special Weather Statement	MOB	Butler	42 min
Apr 30, 5:49 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin, Escambia	41 min
Apr 30, 6:10 PM CDT	Severe Thunderstorm Warning	MOB	Conecuh, Escambia	35 min
Apr 30, 6:15 PM CDT	Special Marine Warning	MOB		90 min
Apr 30, 6:17 PM CDT	Flash Flood Watch	MOB	Baldwin, Butler, Clarke, Conecuh, Escambia, Mobile and 3 more	9 hr
Apr 30, 6:23 PM CDT	Areal Flood Advisory	MOB	Baldwin	3 hr
Apr 30, 6:37 PM CDT	Special Weather Statement	MOB	Conecuh, Escambia	53 min
Apr 30, 11:20 AM CDT	Special Weather Statement	MOB	George, Greene, Perry, Stone, Wayne	55 min
Apr 30, 11:34 AM CDT	Severe Thunderstorm Warning	MOB	Greene, Perry, Wayne	41 min
Apr 30, 12:16 PM CDT	Severe Thunderstorm Warning	MOB	George, Greene, Perry, Stone	44 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.