Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 82, NWS Melbourne, FL

August 15, 2012Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 15, 2012, 6:43 PM EDT for Volusia County, Florida. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 15, 2012, 6:43 PM EDT (22:43 UTC)
Expired: Aug 15, 2012, 7:15 PM EDT
In force: 32 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Volusia County, FL

What was reported inside it

Time	Report	Where	Remark
Aug 15, 6:54 PM EDT	TSTM WND GST 43	Daytona Beach Airport, FL	KDAB ASOS MEASURED A THUNDERSTORM WIND GUST OF 37 KT/43 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.7 hours before the alert went out and 113 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: 391 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 37 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.

170 
WUUS52 KMLB 152243
SVRMLB
FLC127-152315-
/O.NEW.KMLB.SV.W.0082.120815T2243Z-120815T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
643 PM EDT WED AUG 15 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL VOLUSIA COUNTY IN FLORIDA

* UNTIL 715 PM EDT.

* AT 640 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM ORMOND BY THE SEA TO DAYTONA INTERNATIONAL SPEEDWAY TO 8 MILES
  EAST OF DE LEON SPRINGS...MOVING EAST-SOUTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  DAYTONA BEACH INTL SPEEDWAY...HOLLY HILL...DAYTONA BEACH...SOUTH
  DAYTONA...PORT ORANGE...WILBUR BY THE SEA AND PONCE INLET

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR AND OR LARGE DESTRUCTIVE HAIL. FREQUENT TO EXCESSIVE LIGHTNING
AND VERY HEAVY RAIN WILL ALSO BE POSSIBLE. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.

&&

LAT...LON 2941 8108 2937 8107 2909 8092 2910 8136
      2927 8129 2927 8116 2941 8116 2943 8114
      2943 8110
TIME...MOT...LOC 2243Z 283DEG 17KT 2934 8112 2923 8112
          2912 8120

$$

SEDLOCK

2 follow-up statements

469 
WWUS52 KMLB 152300
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
700 PM EDT WED AUG 15 2012

FLC127-152315-
/O.CON.KMLB.SV.W.0082.000000T0000Z-120815T2315Z/
VOLUSIA-
700 PM EDT WED AUG 15 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT 
FOR NORTHEAST VOLUSIA COUNTY...

AT 658 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM ORMOND BY THE SEA TO DAYTONA BEACH TO DAYTONA BEACH 
AIRPORT...MOVING EAST-SOUTHEAST AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BLAKE...SOUTH DAYTONA...DAYTONA BEACH SHORES...HARBOR OAKS...WILBUR
BY THE SEA...PONCE INLET AND ALLANDALE

LAT...LON 2926 8116 2927 8116 2936 8111 2937 8110
      2937 8107 2909 8092 2910 8120
TIME...MOT...LOC 2259Z 283DEG 17KT 2932 8100 2922 8103
          2913 8107

$$

SEDLOCK

499 
WWUS52 KMLB 152314
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
714 PM EDT WED AUG 15 2012

FLC127-152324-
/O.EXP.KMLB.SV.W.0082.000000T0000Z-120815T2315Z/
VOLUSIA-
714 PM EDT WED AUG 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL VOLUSIA COUNTY WILL
EXPIRE AT 715 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND THE 
WARNING HAS BEEN ALLOWED TO EXPIRE. WIND GUSTS TO 40 MPH...FREQUENT 
LIGHTNING AND TORRENTIAL RAINFALL WILL REMAIN POSSIBLE FOR A WHILE 
LONGER.

LAT...LON 2926 8116 2927 8116 2936 8111 2937 8110
      2937 8107 2909 8092 2910 8120
TIME...MOT...LOC 2314Z 283DEG 17KT 2930 8092 2920 8095
          2911 8099

$$

SEDLOCK

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 5:47 PM EDT	Special Weather Statement	MLB	Flagler	58 min
Aug 15, 5:54 PM EDT	Special Marine Warning	MLB		111 min
Aug 15, 7:28 PM EDT	Special Weather Statement	MLB	Volusia	47 min
Aug 15, 7:52 PM EDT	Special Weather Statement	MLB	Seminole	38 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.