Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 30, NWS Melbourne, FL

May 11, 2011Orange County, Osceola County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 11, 2011, 6:02 PM EDT for Orange County, Osceola County, Seminole County, Florida. It was in force for 58 min. 5 reports 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: May 11, 2011, 6:02 PM EDT (22:02 UTC)
Expired: May 11, 2011, 7:00 PM EDT
In force: 58 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Orange County, FL, Osceola County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 69 km from the middle of the area, began a volume at 22:04 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

Time	Report	Where	Remark
May 11, 6:02 PM EDT	HAIL 0.25	5 Ene Azalea Park, FL	ALAFIA AND SR 50 PEA SIZE FOR AROUND 5 MINUTES
May 11, 6:10 PM EDT	TSTM WND DMG	5 Ese Goldenrod, FL	1 1/2 TO 2 INCH BRANCHES DOWN
May 11, 6:10 PM EDT	HAIL 0.25	4 Ene Azalea Park, FL	UNION PARK DRIVE
May 11, 6:40 PM EDT	HAIL 0.25	1 Sw Azalea Park, FL	PEA SIZE HAIL AND STREET FLOODING LIDO STREET
May 11, 6:41 PM EDT	TSTM WND GST 47	2 W Azalea Park, FL	ASOS OBS ORLANDO EXECUTIVE ARPT. RMK PK WND 08041/2221, OBS AT 2251 UTC

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, 10.0 hours before the alert went out and 71 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: 304 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

214 
WUUS52 KMLB 112202
SVRMLB
FLC095-097-117-112300-
/O.NEW.KMLB.SV.W.0030.110511T2202Z-110511T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
602 PM EDT WED MAY 11 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL ORANGE COUNTY IN FLORIDA
  EXTREME NORTH CENTRAL OSCEOLA COUNTY IN FLORIDA
  SOUTHWESTERN SEMINOLE COUNTY IN FLORIDA

* UNTIL 700 PM EDT.

* AT 559 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
  GOLDENROD...AND MOVING SOUTHEAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED 
TO...UNIVERSAL STUDIOS...ORLANDO...WET N WILD WATER PARK...PINE 
CASTLE...BELLE ISLE...SEA WORLD...ORLANDO INTERNATIONAL AIRPORT... 
BUENA VENTURA LAKES AND LAKE MARY JANE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 2832 8100 2833 8150 2872 8143 2872 8120
TIME...MOT...LOC 2201Z 335DEG 15KT 2860 8124

$$



BRAGAW

2 follow-up statements

125 
WWUS52 KMLB 112224
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
624 PM EDT WED MAY 11 2011

FLC117-112231-
/O.CAN.KMLB.SV.W.0030.000000T0000Z-110511T2300Z/
SEMINOLE-
624 PM EDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SEMINOLE COUNTY
IS CANCELLED...

THE STORMS THAT PROMPTED THE WARNING HAVE MOVED INTO ORANGE COUNTY 
AND NO LONGER POSE A THREAT FOR SOUTHWESTERN SEMINOLE COUNTY. 

LAT...LON 2863 8145 2864 8144 2864 8133 2863 8132
      2861 8132 2861 8116 2832 8100 2833 8150
TIME...MOT...LOC 2221Z 354DEG 16KT 2855 8131

$$

FLC095-097-112300-
/O.CON.KMLB.SV.W.0030.000000T0000Z-110511T2300Z/
OSCEOLA-ORANGE-
624 PM EDT WED MAY 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR CENTRAL ORANGE AND EXTREME NORTH CENTRAL OSCEOLA COUNTIES...

AT 616 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT A LARGE CLUSTER OF THUNDERSTORMS CAPABLE OF PRODUCING QUARTER 
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR ALOMA...OR NEAR AZALEA PARK...MOVING SOUTH AT 20 MPH.

THESE STORMS ARE EXPECTED TO INTENSIFY AS THEY INTERACT WITH THE 
EAST COAST SEA BREEZE PUSHING INTO CENTRAL ORANGE COUNTY. 

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
ORLANDO...UNIVERSAL STUDIOS...EDGEWOOD...WET N WILD WATER 
PARK...ORLANDO INTERNATIONAL AIRPORT...SEA WORLD...LAKE MARY JANE 
AND BUENA VENTURA LAKES.

LAT...LON 2863 8145 2864 8144 2864 8133 2863 8132
      2861 8132 2861 8116 2832 8100 2833 8150
TIME...MOT...LOC 2221Z 354DEG 16KT 2855 8131

$$

812 
WWUS52 KMLB 112256
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
656 PM EDT WED MAY 11 2011

FLC095-097-112306-
/O.EXP.KMLB.SV.W.0030.000000T0000Z-110511T2300Z/
OSCEOLA-ORANGE-
656 PM EDT WED MAY 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ORANGE AND EXTREME
NORTH CENTRAL OSCEOLA COUNTIES WILL EXPIRE AT 700 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA...THUS THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 2863 8145 2864 8144 2864 8133 2863 8132
      2861 8132 2861 8116 2832 8100 2833 8150
TIME...MOT...LOC 2256Z 354DEG 16KT 2840 8129

$$



BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 5:53 PM EDT	Special Weather Statement	MLB	Orange	37 min
May 11, 5:59 PM EDT	Special Weather Statement	MLB	Saint Lucie	46 min
May 11, 6:54 PM EDT	Areal Flood Advisory	MLB	Orange	51 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011 Every 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.