Alert archive / Florida / Tornado Warnings in 2012

Tornado Warning 102, NWS Mobile, AL

December 20, 2012Escambia County, Santa Rosa County, Florida

NWS Mobile, AL issued this tornado warning at Dec 20, 2012, 9:00 AM CST for Escambia County, Santa Rosa County, Florida. It was in force for 60 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, 9:00 AM CST (15:00 UTC)
Expired
Dec 20, 2012, 10:00 AM CST
In force
60 min
Issued by
NWS Mobile, AL
Area
Storm-based polygon

Counties Escambia County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 112 km from the middle of the area, began a volume at 15:00 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.0 hours before the alert went out and 250 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, Slidell Radar S, LA at 12:00Z on 2012-12-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1181 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2012-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 275 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
1181 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
506 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
275 m²/s²
0-3 km storm-relative helicity
310 m²/s²
Significant tornado parameter
2.0
Supercell composite
9.6

Open this sounding in Storm Lab

The text

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

465 
WFUS54 KMOB 201500
TORMOB
FLC033-113-201600-
/O.NEW.KMOB.TO.W.0102.121220T1500Z-121220T1600Z/

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  SOUTHERN SANTA ROSA COUNTY IN NORTHWEST FLORIDA...

* UNTIL 1000 AM CST

* AT 856 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 5 MILES SOUTH OF ORANGE BEACH...OR 9 MILES
  SOUTHWEST OF PERDIDO BEACH...MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PENSACOLA INTERNATIONAL AIRPORT...          TIGER POINT...
  ROEVILLE...           PEA RIDGE...          MULAT...
  FLORIDATOWN...        ORIOLE BEACH...       MILTON...
  GULF BREEZE...

THIS INCLUDES INTERSTATE 10 BETWEEN MILE MARKERS 10 AND 34.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3073 8699 3052 8682 3043 8697 3045 8695
      3050 8703 3054 8703 3043 8710 3051 8710
      3057 8717 3047 8715 3038 8726 3033 8726
      3034 8717 3041 8709 3041 8700 3035 8714
      3035 8711 3032 8714 3027 8755
TIME...MOT...LOC 1500Z 235DEG 37KT 3025 8753

$$
1 follow-up statement
779 
WWUS54 KMOB 201558
SVSMOB

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

FLC033-113-201607-
/O.EXP.KMOB.TO.W.0102.000000T0000Z-121220T1600Z/
SANTA ROSA FL-ESCAMBIA FL-
958 AM CST THU DEC 20 2012

...THE TORNADO WARNING WILL BE ALLOWED TO EXPIRE FOR SOUTHEASTERN 
ESCAMBIA AND SOUTHERN SANTA ROSA COUNTIES...

AT 956 AM CST...THE STORM THAT PROMPTED THE WARNING FOR SOUTHEASTERN 
ESCAMBIA AND SOUTHERN SANTA ROSA COUNTIES HAS SIGNIFICANTLY WEAKENED 
...THUS THE TORNADO WARNING WILL BE ALLOWED TO EXPIRE AT 1000 AM 
CST.

A STORM OVER EXTREME EASTERN SANTA ROSA COUNTY IS BEING MONITORED 
CLOSELY. IF ROTATION REDEVELOPS...ADDITIONAL WARNINGS MAY BE ISSUED.

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

LAT...LON 3073 8699 3052 8682 3043 8697 3045 8695
      3050 8703 3054 8703 3043 8710 3051 8710
      3057 8717 3047 8715 3038 8726 3033 8726
      3034 8717 3041 8709 3041 8700 3035 8714
      3035 8711 3032 8714 3027 8755
TIME...MOT...LOC 1557Z 235DEG 37KT 3059 8697

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 7:52 AM CSTTornado WarningMOBEscambia53 min
Dec 20, 8:27 AM CSTTornado WarningMOBEscambia, Okaloosa, Santa Rosa63 min
Dec 20, 8:29 AM CSTTornado WarningMOBOkaloosa, Santa Rosa46 min
Dec 20, 8:41 AM CSTTornado WarningMOBEscambia, Okaloosa, Santa Rosa64 min
Dec 20, 9:11 AM CSTTornado WarningMOBOkaloosa, Santa Rosa25 min
Dec 20, 9:25 AM CSTTornado WarningMOBOkaloosa55 min
Dec 20, 9:43 AM CSTTornado WarningMOBOkaloosa, Santa Rosa62 min
Dec 20, 10:19 AM CSTAreal Flood AdvisoryMOBEscambia, Okaloosa, Santa Rosa3 hr
Dec 20, 2:19 PM CSTRed Flag WarningMOB27 hr

Nearby

Tornado Warnings in Florida, 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.