Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 47, NWS Melbourne, FL

May 27, 2011Orange County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 27, 2011, 8:51 PM EDT for Orange County, Osceola County, Florida. It was in force for 24 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 27, 2011, 8:51 PM EDT (00:51 UTC)
Expired: May 27, 2011, 9:15 PM EDT
In force: 24 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Orange County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 64 km from the middle of the area, began a volume at 00:52 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 00:00Z, 0.9 hours before the alert went out and 74 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: 990 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1047 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

308 
WUUS52 KMLB 280051
SVRMLB
FLC095-097-280115-
/O.NEW.KMLB.SV.W.0047.110528T0051Z-110528T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
851 PM EDT FRI MAY 27 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL ORANGE COUNTY IN FLORIDA
  NORTH CENTRAL OSCEOLA COUNTY IN FLORIDA

* UNTIL 915 PM EDT.

* AT 848 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 ORLANDO INTERNATIONAL
  AIRPORT...AND MOVING SOUTHEAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  BUENA VENTURA LAKES...SAINT CLOUD...NARCOOSSEE...LAKE MARY JANE AND
  EAST LAKE TOHO

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 2838 8106 2818 8119 2836 8150 2852 8140
TIME...MOT...LOC 0051Z 299DEG 15KT 2839 8136

$$
BOWEN

1 follow-up statement

070 
WWUS52 KMLB 280116
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
916 PM EDT FRI MAY 27 2011

FLC095-097-280126-
/O.EXP.KMLB.SV.W.0047.000000T0000Z-110528T0115Z/
OSCEOLA-ORANGE-
916 PM EDT FRI MAY 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL ORANGE AND NORTH
CENTRAL OSCEOLA COUNTIES HAS EXPIRED...

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

LAT...LON 2838 8106 2818 8119 2836 8150 2852 8140
TIME...MOT...LOC 0051Z 299DEG 15KT 2839 8136

$$
BOWEN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 8:44 PM EDT	Special Weather Statement	MLB	Orange	46 min
May 28, 4:37 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	38 min
May 28, 5:23 PM EDT	Special Weather Statement	MLB	Okeechobee	37 min
May 28, 6:03 PM EDT	Special Weather Statement	MLB	Lake	42 min
May 28, 6:39 PM EDT	Areal Flood Advisory	MLB	Lake, Orange	111 min
May 28, 6:50 PM EDT	Special Weather Statement	MLB	Lake	40 min
May 28, 7:17 PM EDT	Areal Flood Warning	MLB	Orange	103 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.