Alert archive / Florida / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 21, NWS Melbourne, FL

May 11, 2013Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 11, 2013, 5:22 PM EDT for Osceola County, Florida. It was in force for 38 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 11, 2013, 5:22 PM EDT (21:22 UTC)
Expired: May 11, 2013, 6:00 PM EDT
In force: 38 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 34 km from the middle of the area, began a volume at 21:24 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

Tampa Bay, FL (KTBW), launched 12:00Z, 9.4 hours before the alert went out and 146 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: 1790 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 479 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

184 
WUUS52 KMLB 112122
SVRMLB
FLC097-112200-
/O.NEW.KMLB.SV.W.0021.130511T2122Z-130511T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
522 PM EDT SAT MAY 11 2013

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 600 PM EDT.

* AT 519 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH AND LARGE HAIL. THIS STORM WAS LOCATED NEAR
  HOLOPAW...AND MOVING EAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  FOREVER FLORIDA AND DEER PARK.

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 2823 8088 2802 8089 2805 8118 2820 8119
TIME...MOT...LOC 2122Z 261DEG 17KT 2813 8109

$$

DWS

1 follow-up statement

154 
WWUS52 KMLB 112154
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
554 PM EDT SAT MAY 11 2013

FLC097-112204-
/O.EXP.KMLB.SV.W.0021.000000T0000Z-130511T2200Z/
OSCEOLA-
554 PM EDT SAT MAY 11 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL OSCEOLA COUNTY WILL
EXPIRE AT 600 PM EDT...

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

LAT...LON 2823 8088 2802 8089 2805 8118 2820 8119
TIME...MOT...LOC 2154Z 261DEG 17KT 2815 8092

$$

JP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 4:05 PM EDT	Special Weather Statement	MLB	Orange	40 min
May 11, 4:24 PM EDT	Special Weather Statement	MLB	Brevard	36 min
May 11, 4:39 PM EDT	Special Weather Statement	MLB	Brevard	36 min
May 11, 4:47 PM EDT	Special Marine Warning	MLB		118 min
May 11, 4:50 PM EDT	Severe Thunderstorm Warning	MLB	Brevard	55 min
May 11, 5:05 PM EDT	Special Weather Statement	MLB	Okeechobee	40 min
May 11, 5:20 PM EDT	Special Weather Statement	MLB	Osceola	40 min
May 11, 6:02 PM EDT	Special Weather Statement	MLB	Indian River	43 min
May 11, 6:33 PM EDT	Special Weather Statement	MLB	Martin	57 min
May 11, 6:46 PM EDT	Special Marine Warning	MLB		119 min
May 11, 6:58 PM EDT	Severe Thunderstorm Warning	MLB	Martin, Saint Lucie	47 min

Nearby

Severe Thunderstorm Warnings in Florida, 2013 Every severe thunderstorm warning in 2013

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.