Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 22, NWS Melbourne, FL

April 5, 20114 counties in Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 5, 2011, 10:58 AM EDT for 4 counties in Florida. It was in force for 62 min. 1 report 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, 10:58 AM EDT (14:58 UTC)
Expired: Apr 5, 2011, 12:00 PM EDT
In force: 62 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Brevard County, FL, Indian River County, FL, Okeechobee County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 63 km from the middle of the area, began a volume at 14:58 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, 11:31 AM EDT	TSTM WND GST 47	3 Ese Gifford, FL	WEATHER STATION REPORTED WIND GUST OF 41 KT/47 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, 3.0 hours before the alert went out and 105 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.

515 
WUUS52 KMLB 051458
SVRMLB
FLC009-061-093-111-051600-
/O.NEW.KMLB.SV.W.0022.110405T1458Z-110405T1600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
1058 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BREVARD COUNTY IN FLORIDA
  INDIAN RIVER COUNTY IN FLORIDA
  OKEECHOBEE COUNTY IN FLORIDA
  NORTHERN ST. LUCIE COUNTY IN FLORIDA

* UNTIL NOON EDT.

* AT 1053 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 BAREFOOT BAY TO 8 MILES SOUTHWEST OF BLUE CYPRESS LAKE TO 
35   MILES WEST OF BASINGER...AND   MOVING EAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED 
TO...  MICCO...FELLSMERE...ROSELAND...SEBASTIAN INLET...VERO LAKE 
ESTATES...SEBASTIAN...FORT DRUM...WABASSO...  WINTER BEACH...INDIAN 
RIVER SHORES...GIFFORD...VERO BEACH...SAINT LUCIE 
AIRPORT...OKEECHOBEE...QUEENS COVE...FOUR SEASONS ESTATES...AND FORT 
PIERCE INLET

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. SMALL HAIL MAY ALSO ACCOMPANY HEAVIER 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.

&&

LAT...LON 2725 8100 2736 8104 2739 8112 2749 8121
      2754 8121 2763 8114 2764 8087 2782 8087
      2784 8080 2790 8050 2771 8040 2794 8050
      2794 8048 2768 8035 2769 8035 2748 8029
      2719 8074 2720 8080 2715 8087
TIME...MOT...LOC 1457Z 291DEG 26KT 2788 8055 2763 8082
          2725 8154

$$

SEDLOCK

1 follow-up statement

708 
WWUS52 KMLB 051534
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1134 AM EDT TUE APR 5 2011

FLC009-051542-
/O.CAN.KMLB.SV.W.0022.000000T0000Z-110405T1600Z/
BREVARD-
1134 AM EDT TUE APR 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BREVARD COUNTY IS
CANCELLED...

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

LAT...LON 2739 8113 2752 8121 2754 8121 2760 8110
      2764 8087 2774 8072 2779 8050 2773 8042
      2785 8049 2771 8040 2785 8045 2768 8035
      2769 8035 2748 8029 2749 8033 2746 8033
      2719 8073 2720 8080 2715 8087
TIME...MOT...LOC 1532Z 291DEG 26KT 2779 8028 2754 8055
          2728 8128

$$

FLC061-093-111-051600-
/O.CON.KMLB.SV.W.0022.000000T0000Z-110405T1600Z/
OKEECHOBEE-ST. LUCIE-INDIAN RIVER-
1134 AM EDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON EDT FOR
INDIAN RIVER...NORTHERN ST. LUCIE AND OKEECHOBEE COUNTIES...

AT 1130 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 6 MILES EAST OF DISNEYS VERO BEACH RESORT TO 8 MILES 
SOUTHWEST OF PARADISE PARK TO 19 MILES SOUTHWEST OF 
BASINGER...MOVING EAST AT 30 TO 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO VERO 
BEACH...JAYCEE BEACH...GROVENOR ESTATES...DIXIE HEIGHTS...LAKEWOOD 
PARK...THE MOORINGS...FLORALTON BEACH...COUNTRY HILLS 
ESTATES...INDRIO...SAINT LUCIE VILLAGE...QUEENS COVE...PEPPER BEACH 
PARK...FORT PIERCE INLET...WHISPERING PINES...TAYLOR 
CREEK...OKEECHOBEE...FOUR SEASONS ESTATES AND BASSWOOD ESTATES

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. 
WATERSPOUTS ARE VERY POSSIBLE OFF OF THE COAST ACROSS THE WESTERN 
ATLANTIC WATERS.

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

&&

LAT...LON 2739 8113 2752 8121 2754 8121 2760 8110
      2764 8087 2774 8072 2779 8050 2773 8042
      2785 8049 2771 8040 2785 8045 2768 8035
      2769 8035 2748 8029 2749 8033 2746 8033
      2719 8073 2720 8080 2715 8087
TIME...MOT...LOC 1532Z 291DEG 26KT 2779 8028 2754 8055
          2728 8128

$$

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, 10:14 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River, Osceola	61 min
Apr 5, 10:50 AM EDT	Special Marine Warning	MLB		115 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.