Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 15, NWS Melbourne, FL

March 31, 2011Lake County, Orange County, Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 31, 2011, 10:16 AM EDT for Lake County, Orange County, Seminole County, Florida. It was in force for 59 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
Mar 31, 2011, 10:16 AM EDT (14:16 UTC)
Expired
Mar 31, 2011, 11:15 AM EDT
In force
59 min
Issued by
NWS Melbourne, FL
Area
Storm-based polygon

Counties Lake County, FL, Orange County, FL, Seminole County, FL

The radar

The Tampa radar (KTBW), 106 km from the middle of the area, began a volume at 14:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Mar 31, 6:00 AM EDTTornado WatchSPC7 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 2.3 hours before the alert went out and 106 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2011-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 728 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2011-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 543 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
728 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
787 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
543 m²/s²
0-3 km storm-relative helicity
606 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.9

Open this sounding in Storm Lab

The text

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

219 
WUUS52 KMLB 311416
SVRMLB
FLC069-095-117-311515-
/O.NEW.KMLB.SV.W.0015.110331T1416Z-110331T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
1016 AM EDT THU MAR 31 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LAKE COUNTY IN FLORIDA
  WESTERN ORANGE COUNTY IN FLORIDA
  WESTERN SEMINOLE COUNTY IN FLORIDA

* UNTIL 1115 AM EDT.

* AT 1014 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 15 MILES WEST OF MASCOTTE...AND
  MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  GROVELAND...FRUITLAND PARK...LEESBURG...LAKE GRIFFIN...LAKE
  HARRIS...CLERMONT...LAKE LOUISA...HOWEY IN THE HILLS...LISBON...
  FERNDALE...MID FLORIDA LAKES...TAVARES...ANIMAL KINGDOM...MGM
  STUDIOS...MAGIC KINGDOM...LAKE APOPKA...HOLLYWOOD STUDIOS...
  EUSTIS...EPCOT...WINTER GARDEN...MOUNT DORA...LAKE BUENA VISTA...
  PLEASURE ISLAND...ZELLWOOD...WINDERMERE...BAY HILL...OCOEE...DOCTOR
  PHILLIPS...SEA WORLD...WET N WILD WATER PARK...UNIVERSAL STUDIOS...
  APOPKA...MOUNT PLYMOUTH...ORLOVISTA...PINE HILLS...OAK RIDGE...
  WEKIWA SPRINGS STATE PARK...LOCKHART...FOREST CITY...PINE CASTLE...
  WEKIVA SPRINGS...ORLANDO...CASSIA...FAIRVIEW SHORES...ALTAMONTE
  SPRINGS AND MAITLAND

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM EDT THURSDAY 
AFTERNOON FOR THE WARNED AREA. IF A TORNADO IS SPOTTED...ACT 
QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH 
AS A SMALL INTERIOR ROOM.

&&

LAT...LON 2888 8196 2900 8137 2834 8137 2834 8166
      2834 8179 2835 8180 2835 8185 2834 8186
      2834 8195 2834 8196 2840 8196
TIME...MOT...LOC 1416Z 257DEG 44KT 2865 8209

$$


MOSES
2 follow-up statements
842 
WWUS52 KMLB 311448
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1048 AM EDT THU MAR 31 2011

FLC069-095-117-311515-
/O.CON.KMLB.SV.W.0015.000000T0000Z-110331T1515Z/
ORANGE-SEMINOLE-LAKE-
1048 AM EDT THU MAR 31 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR LAKE...WESTERN SEMINOLE AND WESTERN ORANGE COUNTIES...

AT 1044 AM 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 ASTATULA...OR NEAR
HOWEY IN THE HILLS...MOVING EAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MAGIC 
KINGDOM...LAKE APOPKA...EUSTIS...EPCOT...WINTER GARDEN...MOUNT 
DORA...LAKE BUENA 
VISTA...UMATILLA...ZELLWOOD...WINDERMERE...OCOEE...DOCTOR 
PHILLIPS...PLYMOUTH...UNIVERSAL STUDIOS...CLARCONA...APOPKA...MOUNT 
PLYMOUTH...WEKIWA SPRINGS STATE PARK...WEKIVA 
SPRINGS...ORLANDO...CASSIA AND ALTAMONTE SPRINGS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A SMALL INTERIOR ROOM.

&&

LAT...LON 2888 8196 2900 8137 2834 8137 2834 8166
      2834 8179 2835 8180 2835 8185 2834 8186
      2834 8195 2834 8196 2840 8196
TIME...MOT...LOC 1446Z 257DEG 44KT 2873 8168

$$


MOSES
888 
WWUS52 KMLB 311513
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1113 AM EDT THU MAR 31 2011

FLC069-095-117-311523-
/O.EXP.KMLB.SV.W.0015.000000T0000Z-110331T1515Z/
ORANGE-SEMINOLE-LAKE-
1113 AM EDT THU MAR 31 2011

...THE SEVERE THUNDERSTORM WARNING FOR LAKE...WESTERN SEMINOLE AND
WESTERN ORANGE COUNTIES WILL EXPIRE AT 1115 AM EDT...

WIND GUSTS UP TO 40 MPH...FREQUENT LIGHTNING...AND SMALL HAIL WILL 
STILL BE POSSIBLE. A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM 
EDT THURSDAY AFTERNOON FOR EAST CENTRAL FLORIDA.

LAT...LON 2888 8196 2900 8137 2834 8137 2834 8166
      2834 8179 2835 8180 2835 8185 2834 8186
      2834 8195 2834 8196 2840 8196
TIME...MOT...LOC 1513Z 257DEG 44KT 2880 8131

$$


MOSES

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 31, 12:38 AM EDTSpecial Marine WarningMLB82 min
Mar 31, 3:42 AM EDTSmall Craft Advisory for WindsMLB24 hr
Mar 31, 6:16 AM EDTSpecial Weather StatementMLBLake59 min
Mar 31, 6:58 AM EDTSpecial Weather StatementMLBBrevard, Lake, Orange, Osceola, Seminole, Volusia62 min
Mar 31, 7:04 AM EDTSevere Thunderstorm WarningMLBLake, Orange, Seminole, Volusia56 min
Mar 31, 7:27 AM EDTSevere Thunderstorm WarningMLBLake, Orange, Osceola63 min
Mar 31, 7:33 AM EDTSpecial Marine WarningMLB117 min
Mar 31, 7:43 AM EDTTornado WarningMLBBrevard, Seminole, Volusia42 min
Mar 31, 8:13 AM EDTSevere Thunderstorm WarningMLBBrevard, Orange, Volusia47 min
Mar 31, 8:30 AM EDTSevere Thunderstorm WarningMLBBrevard, Indian River, Osceola27 min
Mar 31, 9:01 AM EDTSevere Thunderstorm WarningMLBLake, Orange, Osceola59 min
Mar 31, 10:37 AM EDTTornado WarningMLBLake, Orange, Seminole, Volusia53 min
Mar 31, 10:38 AM EDTSpecial Marine WarningMLB2 hr
Mar 31, 11:31 AM EDTSpecial Weather StatementMLBLake, Orange, Seminole, Volusia44 min
Mar 31, 11:51 AM EDTTornado WarningMLBBrevard, Seminole, Volusia24 min
Mar 31, 12:15 PM EDTTornado WarningMLBBrevard19 min
Mar 31, 12:31 PM EDTSevere Thunderstorm WarningMLBBrevard, Osceola59 min
Mar 31, 12:32 PM EDTTornado WarningMLBOsceola43 min
Mar 31, 12:47 PM EDTSpecial Marine WarningMLB88 min
Mar 31, 1:05 PM EDTTornado WarningMLBBrevard, Osceola23 min
Mar 31, 1:59 PM EDTSpecial Marine WarningMLB2 hr
Mar 31, 2:15 PM EDTSpecial Weather StatementMLBLake, Volusia45 min
Mar 31, 2:21 PM EDTSpecial Marine WarningMLB54 min
Mar 31, 3:58 PM EDTSpecial Weather StatementMLBOrange62 min
Mar 31, 5:52 PM EDTSpecial Weather StatementMLBIndian River53 min
Mar 31, 5:53 PM EDTSpecial Marine WarningMLB112 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011Every 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.