Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 21, NWS Melbourne, FL

April 5, 2011Brevard County, Indian River County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 5, 2011, 10:14 AM EDT for Brevard County, Indian River County, Osceola County, Florida. It was in force for 61 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 5, 2011, 10:14 AM EDT (14:14 UTC)
Expired: Apr 5, 2011, 11:15 AM EDT
In force: 61 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Brevard County, FL, Indian River County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 25 km from the middle of the area, began a volume at 14:16 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.

What was reported inside it

Time	Report	Where	Remark
Apr 5, 10:20 AM EDT	TSTM WND GST 52	5 Ne Port Canaveral, FL	KSC 54 FT TOWER REPORTED WIND GUST OF 45 KT/52 MPH.
Apr 5, 10:25 AM EDT	TSTM WND DMG	Viera, FL	STRUCTURAL DAMAGE REPORTED NEAR VIERA BLVD AND US 1. TIME ESTIMATED BY RADAR.
Apr 5, 10:35 AM EDT	TSTM WND DMG	West Melbourne, FL	STRUCTURAL DAMAGE REPORTED ON MARNIE CIRCLE. TIME ESTIMATED BY RADAR.
Apr 5, 10:39 AM EDT	TSTM WND GST 56	5 Wnw Indialantic, FL	KMLB AT MELBOURNE INTERNATIONAL AIRPORT MEASURED A WIND GUST OF 49 KT/56 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 5, 7:04 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 2.2 hours before the alert went out and 39 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: 656 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

530 
WUUS52 KMLB 051414
SVRMLB
FLC009-061-097-051515-
/O.NEW.KMLB.SV.W.0021.110405T1414Z-110405T1515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
1014 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BREVARD COUNTY IN FLORIDA
  INDIAN RIVER COUNTY IN FLORIDA
  OSCEOLA COUNTY IN FLORIDA

* UNTIL 1115 AM EDT.

* AT 1007 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 7 MILES EAST OF PLAYALINDA BEACH TO 11 MILES SOUTHWEST OF   
VIERA TO 29 MILES SOUTHWEST OF LAKE KISSIMMEE...AND MOVING EAST AT 
40 TO 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  CAPE CANAVERAL...PORT CANAVERAL...COCOA BEACH...SUNTREE...LAKE   
MARIAN...KENANSVILLE...SATELLITE BEACH...  INDIAN HARBOUR 
BEACH...MELBOURNE...INDIALANTIC...  MELBOURNE BEACH...PALM 
BAY...MALABAR...YEEHAW JUNCTION...GRANT...  BLUE CYPRESS LAKE...  
SEBASTIAN INLET...VERO LAKE ESTATES...WABASSO...INDIAN RIVER SHORES 
AND GIFFORD

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. HAIL TO DIME SIZE WILL BE POSSIBLE IN A FEW CELLS 
EMBEDDED WITHIN THIS LINE OF STORMS.

NATIONAL WEATHER SERVICE METEOROLOGISTS ALSO DETECTED SOME WEAK
ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO
MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO
A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A SMALL INTERIOR
ROOM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2 PM EDT FOR THE 
WARNED AREAS.

THIS WARNING REPLACES THE PREVIOUS ONE AND EXTENDS FURTHER SOUTH AND 
EAST.

&&

LAT...LON 2765 8035 2764 8114 2782 8122 2787 8131
      2799 8139 2800 8142 2821 8122 2834 8088
      2858 8080 2858 8079 2835 8072 2860 8073
      2862 8079 2873 8075 2867 8066 2876 8073
      2861 8058 2846 8052 2839 8059 2821 8059
TIME...MOT...LOC 1412Z 269DEG 45KT 2865 8044 2820 8080
          2761 8153

$$

SEDLOCK

1 follow-up statement

794 
WWUS52 KMLB 051449
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1049 AM EDT TUE APR 5 2011

FLC009-061-097-051515-
/O.CON.KMLB.SV.W.0021.000000T0000Z-110405T1515Z/
OSCEOLA-INDIAN RIVER-BREVARD-
1049 AM EDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 AM EDT
FOR SOUTHEASTERN BREVARD...INDIAN RIVER AND SOUTHEASTERN OSCEOLA
COUNTIES...

AT 1044 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 20 MILES EAST OF PORT CANAVERAL TO PALM BAY TO 19 
MILES SOUTHWEST OF YEEHAW JUNCTION...MOVING EAST AT 40 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
MALABAR...VALKARIA...MELBOURNE SHORES...GRANT...FLORIDANA 
BEACH...BAREFOOT BAY...MICCO...SEBASTIAN...ORCHID...WINTER 
BEACH...WABASSO...VERO LAKE ESTATES...SEBASTIAN 
INLET...ROSELAND...INDIAN RIVER SHORES...GIFFORD AND FELLSMERE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NATIONAL WEATHER SERVICE METEOROLOGISTS ALSO DETECTED WEAK ROTATION
WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL
DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY IN A STURDY STRUCTURE...SUCH AS A SMALL INTERIOR ROOM. 
MULTIPLE WATERSPOUTS OFF THE COAST HAVE BEEN REPORTED BY PATRICK AIR 
FORCE BASE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 PM EDT
TUESDAY AFTERNOON FOR EAST CENTRAL FLORIDA.

&&

LAT...LON 2764 8114 2782 8122 2791 8104 2806 8089
      2827 8076 2839 8074 2835 8072 2835 8071
      2859 8073 2851 8067 2867 8066 2847 8052
      2837 8059 2821 8059 2808 8056 2776 8040
      2794 8052 2793 8052 2765 8035
TIME...MOT...LOC 1448Z 274DEG 33KT 2846 8023 2803 8060
          2758 8113

$$

SEDLOCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 3:10 AM EDT	Lake Wind Advisory	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	10 hr
Apr 5, 7:20 AM EDT	Special Weather Statement	MLB	Lake, Volusia	55 min
Apr 5, 7:45 AM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	60 min
Apr 5, 7:48 AM EDT	Special Marine Warning	MLB		117 min
Apr 5, 8:15 AM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange, Osceola, Seminole	60 min
Apr 5, 8:45 AM EDT	Special Weather Statement	MLB	Volusia	45 min
Apr 5, 8:52 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Volusia	38 min
Apr 5, 9:11 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Lake, Orange, Osceola, Seminole, Volusia	64 min
Apr 5, 9:19 AM EDT	Special Marine Warning	MLB		116 min
Apr 5, 10:50 AM EDT	Special Marine Warning	MLB		115 min
Apr 5, 10:58 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River, Okeechobee, Saint Lucie	62 min
Apr 5, 11:59 AM EDT	Severe Thunderstorm Warning	MLB	Martin, Okeechobee, Saint Lucie	61 min
Apr 5, 12:38 PM EDT	Special Marine Warning	MLB		112 min
Apr 5, 12:59 PM EDT	Severe Thunderstorm Warning	MLB	Martin	46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.