Alert archive / Florida / Tornado Warnings in 2012

Tornado Warning 103, NWS Mobile, AL

December 20, 2012Escambia County, Alabama; Okaloosa County, Santa Rosa County, Florida

NWS Mobile, AL issued this tornado warning at Dec 20, 2012, 9:11 AM CST for Escambia County, Alabama; Okaloosa County, Santa Rosa County, Florida. It was in force for 25 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
Dec 20, 2012, 9:11 AM CST (15:11 UTC)
Expired
Dec 20, 2012, 9:36 AM CST
In force
25 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

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

The radar

The Eglin Afb radar (KEVX), 111 km from the middle of the area, began a volume at 15:14 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.

IssuedProductOfficeLasted
Dec 20, 4:23 AM CSTTornado WatchSPC9 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.2 hours before the alert went out and 239 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2012-12-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2012-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 574 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
574 m²/s²
0-3 km storm-relative helicity
705 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

442 
WFUS54 KMOB 201511
TORMOB
ALC053-FLC091-113-201600-
/O.NEW.KMOB.TO.W.0103.121220T1511Z-121220T1600Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOBILE AL
911 AM CST THU DEC 20 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN OKALOOSA COUNTY IN NORTHWEST FLORIDA...
  NORTHERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  EASTERN ESCAMBIA COUNTY IN SOUTH CENTRAL ALABAMA...

* UNTIL 1000 AM CST

* AT 909 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 8 MILES SOUTHEAST OF CENTURY...OR 2 MILES WEST
  OF PINE LEVEL...MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITFIELD...          PINE LEVEL...         JAY...
  US 29 AND CR 43...    RIVERVIEW...          EAST BREWTON...
  BREWTON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3083 8717 3093 8724 3098 8719 3100 8716
      3100 8717 3126 8696 3126 8677 3119 8676
      3119 8670 3101 8670 3099 8667 3097 8667
TIME...MOT...LOC 1511Z 234DEG 44KT 3091 8715

$$
2 follow-up statements
914 
WWUS54 KMOB 201530
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
930 AM CST THU DEC 20 2012

ALC053-FLC091-113-201600-
/O.CON.KMOB.TO.W.0103.000000T0000Z-121220T1600Z/
ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
930 AM CST THU DEC 20 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1000 AM CST FOR EXTREME
NORTHEASTERN SANTA ROSA...EXTREME NORTHWESTERN OKALOOSA AND EASTERN
ESCAMBIA COUNTIES...

AT 928 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 
WAS LOCATED 6 MILES EAST OF EAST BREWTON...OR 6 MILES EAST OF
RIVERVIEW...MOVING NORTHEAST AT 55 MPH.

LOCATIONS IMPACTED INCLUDE...
  US 29 AND CR 43...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.

&&

LAT...LON 3097 8667 3096 8691 3103 8702 3109 8702
      3126 8693 3126 8677 3121 8676 3120 8677
      3119 8676 3119 8670 3100 8670 3099 8667
TIME...MOT...LOC 1530Z 222DEG 49KT 3109 8694

$$
668 
WWUS54 KMOB 201536
SVSMOB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
936 AM CST THU DEC 20 2012

ALC053-FLC091-113-201545-
/O.CAN.KMOB.TO.W.0103.000000T0000Z-121220T1600Z/
ESCAMBIA AL-OKALOOSA FL-SANTA ROSA FL-
936 AM CST THU DEC 20 2012

...THE TORNADO WARNING HAS BEEN CANCELLED FOR EXTREME NORTHEASTERN
SANTA ROSA...EXTREME NORTHWESTERN OKALOOSA AND EASTERN ESCAMBIA
COUNTIES...

AT 933 AM CST...THE STORM THAT PROMPTED THE WARNING FOR EXTREME
NORTHEASTERN SANTA ROSA...EXTREME NORTHWESTERN OKALOOSA AND EASTERN 
ESCAMBIA COUNTIES HAS WEAKENED SIGNIFICANTLY...THUS THE TORNADO 
WARNING HAS BEEN CANCELLED.

NOTE THAT TORNADO WARNINGS STILL REMAIN IN EFFECT FOR OTHER PORTIONS 
OF THE PREVIOUSLY WARNED COUNTIES DUE TO ADDITIONAL ROTATING 
THUNDERSTORMS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CST THURSDAY FOR
SOUTHWESTERN ALABAMA AND NORTHWEST FLORIDA AND SOUTHEAST MISSISSIPPI.

LAT...LON 3097 8667 3096 8691 3103 8702 3109 8702
      3126 8693 3126 8677 3121 8676 3120 8677
      3119 8676 3119 8670 3100 8670 3099 8667
TIME...MOT...LOC 1535Z 222DEG 49KT 3114 8689

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 2:51 AM CSTGale WarningMOB30 hr
Dec 20, 2:51 AM CSTSmall Craft AdvisoryMOB33 hr
Dec 20, 4:11 AM CSTTornado WarningMOBMobile64 min
Dec 20, 4:42 AM CSTTornado WarningMOBMobile36 min
Dec 20, 4:49 AM CSTTornado WarningMOBChoctaw30 min
Dec 20, 5:14 AM CSTTornado WarningMOBBaldwin46 min
Dec 20, 5:29 AM CSTTornado WarningMOBWashington46 min
Dec 20, 5:38 AM CSTTornado WarningMOBChoctaw, Clarke, Washington52 min
Dec 20, 5:45 AM CSTTornado WarningMOBBaldwin, Mobile39 min
Dec 20, 6:03 AM CSTTornado WarningMOBClarke28 min
Dec 20, 6:06 AM CSTTornado WarningMOBWashington22 min
Dec 20, 6:08 AM CSTTornado WarningMOBBaldwin21 min
Dec 20, 6:11 AM CSTTornado WarningMOBConecuh, Escambia, Monroe49 min
Dec 20, 6:39 AM CSTTornado WarningMOBConecuh, Monroe35 min
Dec 20, 6:40 AM CSTTornado WarningMOBWashington50 min
Dec 20, 6:56 AM CSTTornado WarningMOBBaldwin, Mobile34 min
Dec 20, 7:02 AM CSTTornado WarningMOBBaldwin, Mobile58 min
Dec 20, 7:06 AM CSTSpecial Marine WarningMOB84 min
Dec 20, 7:18 AM CSTTornado WarningMOBClarke, Washington42 min
Dec 20, 7:19 AM CSTTornado WarningMOBConecuh, Escambia, Monroe56 min
Dec 20, 7:25 AM CSTTornado WarningMOBClarke, Wilcox50 min
Dec 20, 7:36 AM CSTTornado WarningMOBBaldwin, Clarke, Monroe42 min
Dec 20, 7:52 AM CSTTornado WarningMOBBaldwin53 min
Dec 20, 8:10 AM CSTTornado WarningMOBWilcox32 min
Dec 20, 8:14 AM CSTTornado WarningMOBConecuh, Monroe33 min
Dec 20, 8:15 AM CSTSevere Thunderstorm WarningMOBChoctaw, Clarke17 min
Dec 20, 8:26 AM CSTSpecial Marine WarningMOB94 min
Dec 20, 8:27 AM CSTTornado WarningMOBEscambia63 min
Dec 20, 8:29 AM CSTTornado WarningMOBEscambia46 min
Dec 20, 9:25 AM CSTTornado WarningMOBCovington55 min
Dec 20, 9:28 AM CSTSevere Thunderstorm WarningMOBWilcox15 min
Dec 20, 9:30 AM CSTSpecial Marine WarningMOB60 min
Dec 20, 9:49 AM CSTSevere Thunderstorm WarningMOBWilcox26 min
Dec 20, 9:50 AM CSTTornado WarningMOBCovington, Crenshaw16 min
Dec 20, 10:23 AM CSTSpecial Marine WarningMOB82 min
Dec 20, 11:34 AM CSTSpecial Marine WarningMOB61 min
Dec 20, 2:19 PM CSTFire Weather WatchMOBButler, Conecuh, Covington, Crenshaw, Escambia, Monroe and 1 more16 hr
Dec 20, 2:19 PM CSTRed Flag WarningMOBButler, Choctaw, Clarke, Conecuh, Covington, Crenshaw and 4 more27 hr
Dec 20, 8:41 AM CSTTornado WarningMOBEscambia, Okaloosa, Santa Rosa64 min
Dec 20, 9:00 AM CSTTornado WarningMOBEscambia, Santa Rosa60 min
Dec 20, 9:43 AM CSTTornado WarningMOBOkaloosa, Santa Rosa62 min
Dec 20, 10:19 AM CSTAreal Flood AdvisoryMOBEscambia, Okaloosa, Santa Rosa3 hr

Nearby

Tornado Warnings in Florida, 2012Tornado Warnings in Alabama, 2012Every tornado warning in 2012Tornadoes 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.