Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 154, NWS Mobile, AL

April 30, 2017Baldwin County, Escambia County, Alabama; Escambia County, Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Apr 30, 2017, 5:49 PM CDT for Baldwin County, Escambia County, Alabama; Escambia County, Santa Rosa County, Florida. It was in force for 41 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, 5:49 PM CDT (22:49 UTC)
Expired: Apr 30, 2017, 6:30 PM CDT
In force: 41 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Baldwin County, AL, Escambia County, AL, Escambia County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 67 km from the middle of the area, began a volume at 22:52 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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.8 hours before the alert went out and 214 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: 1930 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

As transmitted.

754 
WUUS54 KMOB 302249
SVRMOB
ALC003-053-FLC033-113-302330-
/O.NEW.KMOB.SV.W.0154.170430T2249Z-170430T2330Z/

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

The National Weather Service in Mobile has issued a

* Severe Thunderstorm Warning for...
  Central Baldwin County in southwestern Alabama...
  Southwestern Escambia County in south central Alabama...
  Northwestern Santa Rosa County in northwestern Florida...
  Escambia County in northwestern Florida...

* Until 630 PM CDT

* At 548 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles northeast of Bay Minette to Loxley, moving
  east at 40 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Bay Minette, Atmore, Robertsdale, Century, Flomaton, Loxley,
  Molino, Pollard and Bratt.

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 southwestern
Alabama.

LAT...LON 3055 8784 3101 8772 3108 8715 3061 8718
TIME...MOT...LOC 2248Z 254DEG 33KT 3096 8767 3064 8776 

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

1 follow-up statement

774 
WWUS54 KMOB 302255
SVSMOB

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

ALC003-053-FLC033-113-302330-
/O.CON.KMOB.SV.W.0154.000000T0000Z-170430T2330Z/
Baldwin AL-Escambia AL-Santa Rosa FL-Escambia FL-
555 PM CDT SUN APR 30 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR CENTRAL BALDWIN...SOUTHWESTERN ESCAMBIA...NORTHWESTERN SANTA ROSA
AND ESCAMBIA COUNTIES...

At 555 PM CDT, severe thunderstorms were located along a line
extending from 8 miles southwest of Atmore to near Loxley, moving
east at 40 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

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

Locations impacted include...
Atmore, Robertsdale, Century, Flomaton, Loxley, Molino, Pollard and
Bratt.

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 southwestern
Alabama.

LAT...LON 3056 8778 3101 8772 3108 8715 3061 8718
TIME...MOT...LOC 2255Z 254DEG 33KT 3097 8763 3065 8772 

TORNADO...POSSIBLE
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, 1:06 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, 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

Nearby

Severe Thunderstorm Warnings in Alabama, 2017 Severe Thunderstorm Warnings in Florida, 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.