Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 68, NWS Melbourne, FL

June 17, 2011Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 17, 2011, 4:45 PM EDT for Osceola County, Florida. It was in force for 44 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
Jun 17, 2011, 4:45 PM EDT (20:45 UTC)
Expired
Jun 17, 2011, 5:29 PM EDT
In force
44 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 45 km from the middle of the area, began a volume at 20:46 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.

What was reported inside it

TimeReportWhereRemark
Jun 17, 4:45 PM EDTHAIL 11 Se Holopaw, FLSPOTTER REPORTED QUARTER-SIZED HAIL ON MERCURY DRIVE IN HOLOPAW.

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, 8.8 hours before the alert went out and 67 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 2011-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 587 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, Cape Canaveral, FL at 12:00Z on 2011-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 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
587 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
1402 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
5 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.

745 
WUUS52 KMLB 172045
SVRMLB
FLC097-172145-
/O.NEW.KMLB.SV.W.0068.110617T2045Z-110617T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
445 PM EDT FRI JUN 17 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 545 PM EDT.

* AT 441 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
  HOLOPAW. THIS STORM WAS NEARLY STATIONARY.

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

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 2825 8125 2829 8097 2807 8092 2804 8113
TIME...MOT...LOC 2045Z 163DEG 2KT 2813 8105

$$

BOWEN
2 follow-up statements
825 
WWUS52 KMLB 172100
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
500 PM EDT FRI JUN 17 2011

FLC097-172145-
/O.CON.KMLB.SV.W.0068.000000T0000Z-110617T2145Z/
OSCEOLA-
500 PM EDT FRI JUN 17 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR CENTRAL OSCEOLA COUNTY...

AT 457 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING 
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR HOLOPAW AND 
WAS NEARLY STATIONARY.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HARMONY...REPTILE WORLD AND ALLIGATOR LAKE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED IN HOLOPAW WITH 
THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE IMMEDIATE 
ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 2825 8125 2829 8097 2807 8092 2804 8113
TIME...MOT...LOC 2059Z 163DEG 2KT 2814 8105

$$

BOWEN
106 
WWUS52 KMLB 172129
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
529 PM EDT FRI JUN 17 2011

FLC097-172139-
/O.CAN.KMLB.SV.W.0068.000000T0000Z-110617T2145Z/
OSCEOLA-
529 PM EDT FRI JUN 17 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL OSCEOLA COUNTY IS
CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN AND
DANGEROUS LIGHTNING STRIKES WILL CONTINUE TO BE POSSIBLE.

LAT...LON 2825 8125 2829 8097 2807 8092 2804 8113
TIME...MOT...LOC 2129Z 163DEG 2KT 2816 8106

$$

BOWEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 2:55 PM EDTSpecial Weather StatementMLBMartin, Saint Lucie50 min
Jun 17, 3:41 PM EDTSpecial Weather StatementMLBMartin, Saint Lucie49 min
Jun 17, 3:47 PM EDTSpecial Weather StatementMLBOkeechobee58 min
Jun 17, 4:06 PM EDTSevere Thunderstorm WarningMLBOsceola39 min
Jun 17, 4:14 PM EDTSevere Thunderstorm WarningMLBMartin31 min
Jun 17, 5:15 PM EDTSpecial Weather StatementMLBOrange60 min
Jun 17, 5:49 PM EDTSevere Thunderstorm WarningMLBOrange, Osceola56 min
Jun 17, 6:02 PM EDTSevere Thunderstorm WarningMLBSeminole, Volusia58 min
Jun 17, 6:11 PM EDTSpecial Weather StatementMLBLake49 min
Jun 17, 6:36 PM EDTSevere Thunderstorm WarningMLBLake, Volusia54 min
Jun 17, 6:48 PM EDTSevere Thunderstorm WarningMLBLake, Orange57 min
Jun 17, 7:02 PM EDTSpecial Marine WarningMLB118 min
Jun 17, 7:17 PM EDTSevere Thunderstorm WarningMLBVolusia42 min
Jun 17, 7:32 PM EDTSpecial Weather StatementMLBVolusia43 min
Jun 17, 7:41 PM EDTAreal Flood AdvisoryMLBLake, Volusia2 hr
Jun 17, 7:41 PM EDTSpecial Weather StatementMLBLake49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every severe thunderstorm warning in 2011

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; radar from the NEXRAD Level II archive.