Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 89, NWS Melbourne, FL

June 24, 2011Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 24, 2011, 5:54 PM EDT for Seminole County, Florida. It was in force for 20 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: Jun 24, 2011, 5:54 PM EDT (21:54 UTC)
Expired: Jun 24, 2011, 6:14 PM EDT
In force: 20 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Seminole County, FL

The radar

The Melbourne radar (KMLB), 89 km from the middle of the area, began a volume at 21:55 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, 9.9 hours before the alert went out and 81 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: 978 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1018 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 24 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.

070 
WUUS52 KMLB 242154
SVRMLB
FLC117-242300-
/O.NEW.KMLB.SV.W.0089.110624T2154Z-110624T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
554 PM EDT FRI JUN 24 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SEMINOLE COUNTY IN FLORIDA

* UNTIL 700 PM EDT.

* AT 546 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   
LONGWOOD...AND MOVING EAST AT 5 TO 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO
  ... WINTER SPRINGS...CASSELBERRY...LAKE JESSUP...OVIEDO...

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 2882 8136 2877 8110 2861 8115 2861 8127
      2861 8132 2863 8132 2864 8134 2864 8144
TIME...MOT...LOC 2154Z 286DEG 24KT 2868 8126

$$



CRISTALDI

2 follow-up statements

059 
WWUS52 KMLB 242202
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
602 PM EDT FRI JUN 24 2011

FLC117-242300-
/O.CON.KMLB.SV.W.0089.000000T0000Z-110624T2300Z/
SEMINOLE-
602 PM EDT FRI JUN 24 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR CENTRAL SEMINOLE COUNTY...

AT 555 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR WINTER SPRINGS...MOVING EAST AT 10 MPH.

SKYWARN SPOTTERS REPORTED SMALL TREES AND LARGER TREE BRANCHES DOWN 
ALONG 434 FROM JUST WEST OF INTERSTATE 4 TO HIGHWAYS 17 AND 92 IN
LONGWOOD.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MIDWAY...LAKE JESSUP...OVIEDO AND GENEVA

LAT...LON 2864 8134 2881 8133 2877 8110 2861 8115
      2861 8132 2863 8132
TIME...MOT...LOC 2201Z 278DEG 8KT 2868 8127

$$



CRISTALDI

760 
WWUS52 KMLB 242214
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
614 PM EDT FRI JUN 24 2011

FLC117-242224-
/O.CAN.KMLB.SV.W.0089.000000T0000Z-110624T2300Z/
SEMINOLE-
614 PM EDT FRI JUN 24 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SEMINOLE 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...VERY HEAVY RAIN 
AND DANGEROUS LIGHTNING STRIKES WILL MOVE ACROSS CENTRAL AND THEN
EASTERN SEMINOLE COUNTY.

LAT...LON 2864 8134 2881 8133 2877 8110 2861 8115
      2861 8132 2863 8132
TIME...MOT...LOC 2214Z 278DEG 8KT 2868 8124

$$



CRISTALDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 9:26 PM EDT	Areal Flood Advisory	MLB	Lake, Volusia	56 min
Jun 23, 10:23 PM EDT	Areal Flood Advisory	MLB	Lake	112 min
Jun 24, 3:55 PM EDT	Special Weather Statement	MLB	Brevard	50 min
Jun 24, 4:17 PM EDT	Special Weather Statement	MLB	Indian River	43 min
Jun 24, 4:21 PM EDT	Special Weather Statement	MLB	Osceola	39 min
Jun 24, 4:25 PM EDT	Special Weather Statement	MLB	Flagler	50 min
Jun 24, 4:45 PM EDT	Special Weather Statement	MLB	Volusia	45 min
Jun 24, 4:46 PM EDT	Special Weather Statement	MLB	Orange, Osceola, Seminole	119 min
Jun 24, 5:08 PM EDT	Special Weather Statement	MLB	Volusia	37 min
Jun 24, 5:12 PM EDT	Special Weather Statement	MLB	Volusia	33 min
Jun 24, 5:27 PM EDT	Areal Flood Advisory	MLB	Volusia	2 hr
Jun 24, 5:38 PM EDT	Special Weather Statement	MLB	Volusia	37 min
Jun 24, 5:50 PM EDT	Special Weather Statement	MLB	Orange	40 min
Jun 24, 6:00 PM EDT	Special Weather Statement	MLB	Osceola	45 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.