Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 29, NWS Melbourne, FL

May 17, 2012Lake County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 17, 2012, 6:53 PM EDT for Lake County, Volusia County, Florida. It was in force for 37 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 17, 2012, 6:53 PM EDT (22:53 UTC)
Expired
May 17, 2012, 7:30 PM EDT
In force
37 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

Counties Lake County, FL, Volusia County, FL

The radar

The Jacksonville radar (KJAX), 140 km from the middle of the area, began a volume at 22:53 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, 10.9 hours before the alert went out and 128 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 2012-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 74 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 2012-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.19395878Sfc1 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
74 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
866 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
65 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.

573 
WUUS52 KMLB 172253
SVRMLB
FLC069-127-172330-
/O.NEW.KMLB.SV.W.0029.120517T2253Z-120517T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
653 PM EDT THU MAY 17 2012

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHERN LAKE COUNTY IN FLORIDA
  NORTHWESTERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 730 PM EDT.

* AT 648 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 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 8 MILES WEST OF PIERSON...AND MOVING SOUTHEAST AT
  10 MPH.

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

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 2928 8141 2927 8141 2927 8136 2926 8130
      2909 8149 2914 8165 2928 8165 2933 8163
TIME...MOT...LOC 2252Z 296DEG 10KT 2921 8158

$$
1 follow-up statement
863 
WWUS52 KMLB 172324
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
724 PM EDT THU MAY 17 2012

FLC069-127-172333-
/O.EXP.KMLB.SV.W.0029.000000T0000Z-120517T2330Z/
LAKE-VOLUSIA-
724 PM EDT THU MAY 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN VOLUSIA AND
EXTREME NORTHERN LAKE COUNTIES WILL EXPIRE AT 730 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA. HOWEVER...GUSTY WINDS AND DANGEROUS LIGHTNING 
STRIKES WILL BE POSSIBLE THROUGH 8 PM.

LAT...LON 2928 8141 2927 8141 2927 8136 2926 8130
      2909 8149 2914 8165 2928 8165 2933 8163
TIME...MOT...LOC 2323Z 296DEG 10KT 2917 8149

$$


KELLY

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 1:45 AM EDTTornado WarningMLBMartin, Saint Lucie27 min
May 17, 2:34 AM EDTTornado WarningMLBMartin41 min
May 17, 2:47 AM EDTSpecial Marine WarningMLB58 min
May 17, 4:27 PM EDTSpecial Marine WarningMLB63 min
May 17, 4:27 PM EDTSpecial Weather StatementMLBIndian River48 min
May 17, 5:37 PM EDTSpecial Weather StatementMLBIndian River38 min
May 17, 5:53 PM EDTSpecial Weather StatementMLBSeminole52 min
May 17, 5:55 PM EDTSpecial Weather StatementMLBMartin50 min
May 17, 5:59 PM EDTSpecial Weather StatementMLBVolusia46 min
May 17, 6:14 PM EDTSevere Thunderstorm WarningMLBLake, Volusia61 min
May 17, 6:27 PM EDTSevere Thunderstorm WarningMLBBrevard63 min
May 17, 6:30 PM EDTSpecial Marine WarningMLB2 hr
May 17, 6:47 PM EDTSpecial Weather StatementMLBVolusia43 min
May 17, 7:14 PM EDTSevere Thunderstorm WarningMLBVolusia61 min
May 17, 7:32 PM EDTSpecial Weather StatementMLBBrevard43 min
May 17, 7:39 PM EDTSevere Thunderstorm WarningMLBBrevard51 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.