Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 19, NWS Melbourne, FL

April 5, 2011Brevard County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 5, 2011, 8:52 AM EDT for Brevard County, Volusia County, Florida. It was in force for 38 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, 8:52 AM EDT (12:52 UTC)
Expired: Apr 5, 2011, 9:30 AM EDT
In force: 38 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Brevard County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 83 km from the middle of the area, began a volume at 12:52 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, 9:05 AM EDT	TSTM WND GST 40	5 N Edgewater, FL	MESONET STATION REPORTED WIND GUST OF 35 KT/40 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, 0.9 hours before the alert went out and 57 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.

587 
WUUS52 KMLB 051252
SVRMLB
FLC009-127-051330-
/O.NEW.KMLB.SV.W.0019.110405T1252Z-110405T1330Z/

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

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BREVARD COUNTY IN FLORIDA
  EASTERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 930 AM EDT.

* AT 849 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
A   POSSIBLE SEVERE THUNDERSTORMS DEVELOPING AHEAD OF THE MAIN LINE 
OF STORMS...CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS   OF 60 
MPH.  THIS STORM WAS LOCATED 8 MILES NORTHWEST OF MAYTOWN...  AND 
MOVING EAST AT 45 TO 50 MPH. OTHER CELLS WERE DEVELOPING IN EASTERN 
VOLUSIA AND NORTH BREVARD COUNTIES AHEAD OF THE MAIN LINE AND MAY 
BECOME SEVERE BEFORE MOVING OFF THE COAST INTO THE INTRA COASTAL  
AND NEAR SHORE WATERS OF THE WESTERN ATLANTIC.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  PORT ORANGE...DAYTONA BEACH...SOUTH DAYTONA...NEW SMYRNA BEACH...
  SCOTTSMOOR...MIMS...EDGEWATER...OAK HILL...BETHUNE BEACH...
  ELDORA...APOLLO BEACH...HAULOVER CANAL AND KLONDIKE BEACH

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.

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 2931 8109 2903 8087 2867 8063 2866 8066
      2887 8080 2886 8082 2866 8068 2864 8079
      2869 8079 2871 8075 2879 8084 2863 8082
      2861 8086 2862 8093 2874 8106 2881 8107
      2882 8111 2880 8114 2895 8132 2895 8134
TIME...MOT...LOC 1251Z 259DEG 50KT 2891 8101

$$

SEDLOCK

1 follow-up statement

520 
WWUS52 KMLB 051328
SVSMLB

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

FLC009-127-051337-
/O.EXP.KMLB.SV.W.0019.000000T0000Z-110405T1330Z/
VOLUSIA-BREVARD-
928 AM EDT TUE APR 5 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN VOLUSIA COUNTY 
WILL BE ALLOWED TO EXPIRE AT 930 AM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE EAST COAST. A PORTION OF SOUTHEASTERN VOLUSIA REMAINS IN ANOTHER 
SEVERE THUNDERSTORM WARNING. WIND GUSTS UP TO 45 MPH MAY BE POSSIBLE 
IN CELLS ACROSS NORTHEAST VOLUSIA COUNTY.

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

LAT...LON 2931 8109 2903 8087 2867 8063 2866 8066
      2887 8080 2886 8082 2866 8068 2864 8079
      2869 8079 2871 8075 2879 8084 2863 8082
      2861 8086 2862 8093 2874 8106 2881 8107
      2882 8111 2880 8114 2895 8132 2895 8134
TIME...MOT...LOC 1327Z 259DEG 50KT 2900 8045

$$

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, 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, 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.