Alert archive / Alabama / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 135, NWS Mobile, AL

July 17, 2012Escambia County, Alabama; Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at Jul 17, 2012, 3:41 PM CDT for Escambia County, Alabama; Santa Rosa County, Florida. It was in force for 26 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: Jul 17, 2012, 3:41 PM CDT (20:41 UTC)
Expired: Jul 17, 2012, 4:07 PM CDT
In force: 26 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Escambia County, AL, Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 105 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 245 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: 1502 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 1108 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

617 
WUUS54 KMOB 172041
SVRMOB
ALC053-FLC113-172145-
/O.NEW.KMOB.SV.W.0135.120717T2041Z-120717T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
341 PM CDT TUE JUL 17 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 445 PM CDT

* AT 339 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING
  WINDS OVER 60 MPH WAS LOCATED 7 MILES EAST OF EAST BREWTON...OR 8
  MILES NORTHEAST OF RIVERVIEW...AND MOVING SOUTH AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RIVERVIEW...

LAT...LON 3086 8679 3077 8705 3119 8706 3120 8685
TIME...MOT...LOC 2041Z 355DEG 17KT 3111 8695

$$

1 follow-up statement

563 
WWUS54 KMOB 172107
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
407 PM CDT TUE JUL 17 2012

ALC053-FLC113-172116-
/O.CAN.KMOB.SV.W.0135.000000T0000Z-120717T2145Z/
ESCAMBIA AL-SANTA ROSA FL-
407 PM CDT TUE JUL 17 2012

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR 
NORTHEASTERN SANTA ROSA COUNTY FLORIDA AND EASTERN ESCAMBIA COUNTY 
ALABAMA...

AT 406 PM CDT...THE STORM THAT PROMPTED THE WARNING FOR NORTHEASTERN 
SANTA ROSA COUNTY FLORIDA AND EASTERN ESCAMBIA COUNTY ALABAMA HAS 
WEAKENED TO BELOW SEVERE LIMITS...THUS THE SEVERE THUNDERSTORM 
WARNING HAS BEEN CANCELLED.

TO REPORT SEVERE WEATHER...CALL (800) 284-9059.

LAT...LON 3086 8679 3077 8705 3119 8706 3120 8685
TIME...MOT...LOC 2106Z 355DEG 17KT 3099 8694

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 6:22 AM CDT	Special Marine Warning	MOB		83 min
Jul 17, 12:41 PM CDT	Special Marine Warning	MOB		94 min
Jul 17, 2:18 PM CDT	Special Marine Warning	MOB		27 min
Jul 17, 2:34 PM CDT	Areal Flood Advisory	MOB	Butler	116 min
Jul 17, 2:58 PM CDT	Special Marine Warning	MOB		62 min
Jul 17, 3:33 PM CDT	Severe Thunderstorm Warning	MOB	Covington	16 min
Jul 17, 4:10 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	36 min
Jul 17, 4:58 PM CDT	Areal Flood Advisory	MOB	Escambia	2 hr
Jul 17, 5:20 PM CDT	Severe Thunderstorm Warning	MOB	Butler	40 min
Jul 17, 5:35 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	40 min
Jul 17, 6:05 PM CDT	Areal Flood Advisory	MOB	Mobile	115 min
Jul 17, 6:36 PM CDT	Special Marine Warning	MOB		84 min
Jul 17, 6:42 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	38 min
Jul 17, 6:49 PM CDT	Special Marine Warning	MOB		56 min
Jul 17, 2:41 PM CDT	Areal Flood Advisory	MOB	Okaloosa	2 hr
Jul 17, 3:31 PM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	26 min
Jul 17, 4:55 PM CDT	Severe Thunderstorm Warning	MOB	Santa Rosa	50 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2012 Severe Thunderstorm Warnings in Florida, 2012 Every severe thunderstorm warning in 2012

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.