Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 155, NWS Mobile, AL

April 30, 2017Conecuh County, Escambia County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Apr 30, 2017, 6:10 PM CDT for Conecuh County, Escambia County, Alabama. It was in force for 35 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, 6:10 PM CDT (23:10 UTC)
Expired: Apr 30, 2017, 6:45 PM CDT
In force: 35 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Conecuh County, AL, Escambia County, AL

The radar

The Mobile radar (KMOB), 100 km from the middle of the area, began a volume at 23:09 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, 11.2 hours before the alert went out and 227 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: 53 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS54 KMOB 302310
SVRMOB
ALC035-053-302345-
/O.NEW.KMOB.SV.W.0155.170430T2310Z-170430T2345Z/

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

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Western Escambia County in south central Alabama...
  Southwestern Conecuh County in south central Alabama...

* Until 645 PM CDT

* At 609 PM CDT, a severe thunderstorm was located over I65 And AL
  21, or near Atmore, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Atmore, Brewton, Century, Flomaton, McCullough, Pollard, I65 And CR
  1, I65 And AL 113, I65 And AL 21 and Poarch Creek Reservation.

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 700 PM CDT for south central
Alabama.

LAT...LON 3123 8756 3126 8748 3126 8743 3130 8740
      3140 8710 3100 8706 3100 8756
TIME...MOT...LOC 2309Z 244DEG 33KT 3112 8746 

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

1 follow-up statement

693 
WWUS54 KMOB 302338
SVSMOB

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

ALC035-053-302348-
/O.EXP.KMOB.SV.W.0155.000000T0000Z-170430T2345Z/
Escambia AL-Conecuh AL-
638 PM CDT SUN APR 30 2017

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ESCAMBIA AND
SOUTHWESTERN CONECUH COUNTIES WILL EXPIRE AT 645 PM CDT...
        
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning will be allowed to expire.  However 
gusty winds and heavy rain are still possible with this thunderstorm.

A tornado watch remains in effect until 700 PM CDT for south central
Alabama.

LAT...LON 3123 8756 3126 8748 3126 8743 3130 8740
      3140 8710 3100 8706 3100 8756
TIME...MOT...LOC 2338Z 270DEG 33KT 3123 8720 

$$

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, 1:06 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw, Clarke, Washington	39 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, 6:15 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

Nearby

Severe Thunderstorm Warnings in Alabama, 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.