Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 63, NWS Mobile, AL

May 21, 2012Escambia County, Santa Rosa County, Florida

NWS Mobile, AL issued this severe thunderstorm warning at May 21, 2012, 5:22 PM CDT for Escambia County, Santa Rosa County, Florida. It was in force for 53 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: May 21, 2012, 5:22 PM CDT (22:22 UTC)
Expired: May 21, 2012, 6:15 PM CDT
In force: 53 min
Issued by: NWS Mobile, AL
Area: Storm-based polygon

Counties Escambia County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 101 km from the middle of the area, began a volume at 22:23 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.4 hours before the alert went out and 247 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: 620 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 39 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.

536 
WUUS54 KMOB 212222
SVRMOB
FLC033-113-212315-
/O.NEW.KMOB.SV.W.0063.120521T2222Z-120521T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
522 PM CDT MON MAY 21 2012

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ESCAMBIA COUNTY IN NORTHWEST FLORIDA...
  SANTA ROSA COUNTY IN NORTHWEST FLORIDA...

* UNTIL 615 PM CDT

* AT 519 PM CDT...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL AND DAMAGING WINDS OVER 60 MPH WERE LOCATED ALONG
  A LINE EXTENDING FROM 7 MILES SOUTHEAST OF FLOMATON TO 2 MILES
  NORTHEAST OF CENTURY...AND MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITING FIELD...      WHITFIELD...          WALLACE...
  SKYLINE...            POINT BAKER...        PEA RIDGE...
  MOUNT CARMEL...       FLORIDATOWN...        FIDELIS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. PREPARE FOR DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3089 8746 3100 8731 3100 8699 3089 8679
      3055 8715 3057 8717 3054 8717 3050 8720
TIME...MOT...LOC 2221Z 299DEG 14KT 3097 8719 3091 8733

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 4:54 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	51 min
May 21, 5:48 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	57 min
May 21, 6:56 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	64 min

Nearby

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.