Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 64, NWS Melbourne, FL

July 7, 2012Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 7, 2012, 5:05 PM EDT for Volusia County, Florida. It was in force for 40 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 7, 2012, 5:05 PM EDT (21:05 UTC)
Expired
Jul 7, 2012, 5:45 PM EDT
In force
40 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

County Volusia County, FL

The radar

The Jacksonville radar (KJAX), 139 km from the middle of the area, began a volume at 21:08 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.1 hours before the alert went out and 130 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, Cape Canaveral, FL at 12:00Z on 2012-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 257 joules per kilogram.LCLLFCEL10008507005003002001001 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, Cape Canaveral, FL at 12:00Z on 2012-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939Sfc1 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
257 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
1111 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
30 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.

329 
WUUS52 KMLB 072105
SVRMLB
FLC127-072145-
/O.NEW.KMLB.SV.W.0064.120707T2105Z-120707T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
505 PM EDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 545 PM EDT.

* AT 503 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN         
  EXCESS   OF 60 MPH.  THIS STORM WAS LOCATED NEAR PIERSON...AND     
  MOVING WEST NORTHWEST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  LAKE GEORGE

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 2927 8141 2926 8138 2921 8137 2910 8147
      2913 8151 2917 8152 2920 8156 2920 8160
      2921 8162 2927 8164 2932 8168 2938 8145
      2940 8142
TIME...MOT...LOC 2105Z 111DEG 13KT 2921 8153

$$

GUSEMAN
2 follow-up statements
546 
WWUS52 KMLB 072122
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
522 PM EDT SAT JUL 7 2012

FLC127-072145-
/O.CON.KMLB.SV.W.0064.000000T0000Z-120707T2145Z/
VOLUSIA-
522 PM EDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHWESTERN VOLUSIA COUNTY...

AT 517 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR LAKE GEORGE...OR 5 MILES WEST OF PIERSON...MOVING WEST 
NORTHWEST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF VOLUSIA COUNTY. CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL WILL 
ACCOMPANY THIS STORM.

LAT...LON 2940 8142 2929 8142 2927 8141 2926 8138
      2921 8137 2911 8148 2913 8151 2917 8152
      2919 8155 2921 8162 2927 8164 2932 8168
      2938 8145
TIME...MOT...LOC 2119Z 111DEG 13KT 2923 8158

$$

GUSEMAN
066 
WWUS52 KMLB 072138
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
538 PM EDT SAT JUL 7 2012

FLC127-072147-
/O.EXP.KMLB.SV.W.0064.000000T0000Z-120707T2145Z/
VOLUSIA-
538 PM EDT SAT JUL 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN VOLUSIA COUNTY
WILL EXPIRE AT 545 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAS WEAKENED...THUS THE 
WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 2940 8142 2929 8142 2927 8141 2926 8138
      2921 8137 2911 8148 2913 8151 2917 8152
      2919 8155 2921 8162 2927 8164 2932 8168
      2938 8145
TIME...MOT...LOC 2137Z 111DEG 13KT 2925 8165

$$

GUSEMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 5:34 PM EDTAreal Flood AdvisoryMLBLake, Volusia56 min
Jul 7, 6:44 PM EDTSpecial Weather StatementMLBLake46 min
Jul 7, 7:29 PM EDTSpecial Weather StatementMLBLake91 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Every 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.