Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 34, NWS Melbourne, FL

May 13, 2011Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 13, 2011, 7:45 PM EDT for Orange County, Seminole County, Florida. It was in force for 45 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 13, 2011, 7:45 PM EDT (23:45 UTC)
Expired: May 13, 2011, 8:30 PM EDT
In force: 45 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Orange County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 68 km from the middle of the area, began a volume at 23:46 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.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.8 hours before the alert went out and 56 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: 53 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 129 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.

780 
WUUS52 KMLB 132345
SVRMLB
FLC095-117-140030-
/O.NEW.KMLB.SV.W.0034.110513T2345Z-110514T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
745 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL ORANGE COUNTY IN FLORIDA
  SOUTHEASTERN SEMINOLE COUNTY IN FLORIDA

* UNTIL 830 PM EDT.

* AT 741 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 UNION PARK...OR NEAR
  BITHLO...AND MOVING EAST AT 15 MPH.

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

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 2870 8103 2869 8102 2867 8102 2866 8101
      2861 8099 2859 8096 2856 8094 2845 8120
      2859 8128
TIME...MOT...LOC 2345Z 254DEG 13KT 2855 8116

$$

2 follow-up statements

794 
WWUS52 KMLB 140001
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
801 PM EDT FRI MAY 13 2011

FLC095-117-140030-
/O.CON.KMLB.SV.W.0034.000000T0000Z-110514T0030Z/
ORANGE-SEMINOLE-
801 PM EDT FRI MAY 13 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTHEASTERN SEMINOLE AND CENTRAL ORANGE COUNTIES...

AT 754 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR BITHLO...MOVING EAST
AT 15 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CHRISTMAS AND CHRISTMAS PARK

LAT...LON 2870 8103 2869 8102 2867 8102 2866 8101
      2861 8099 2859 8096 2856 8094 2845 8120
      2859 8128
TIME...MOT...LOC 0001Z 254DEG 13KT 2857 8110

$$



BRAGAW

725 
WWUS52 KMLB 140027
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
827 PM EDT FRI MAY 13 2011

FLC095-117-140037-
/O.EXP.KMLB.SV.W.0034.000000T0000Z-110514T0030Z/
ORANGE-SEMINOLE-
827 PM EDT FRI MAY 13 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SEMINOLE AND
CENTRAL ORANGE COUNTIES WILL EXPIRE AT 830 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 2870 8103 2869 8102 2867 8102 2866 8101
      2861 8099 2859 8096 2856 8094 2845 8120
      2859 8128
TIME...MOT...LOC 0027Z 254DEG 13KT 2860 8100

$$



BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 6:04 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	28 min
May 13, 6:35 PM EDT	Special Weather Statement	MLB	Volusia	40 min
May 13, 6:53 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	52 min
May 13, 7:32 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Seminole, Volusia	43 min
May 13, 7:53 PM EDT	Severe Thunderstorm Warning	MLB	Seminole, Volusia	37 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.