Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS Melbourne, FL

March 30, 2011Brevard County, Indian River County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 30, 2011, 6:13 PM EDT for Brevard County, Indian River County, Florida. It was in force for 44 min. 2 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: Mar 30, 2011, 6:13 PM EDT (22:13 UTC)
Expired: Mar 30, 2011, 6:57 PM EDT
In force: 44 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Brevard County, FL, Indian River County, FL

The radar

The Melbourne radar (KMLB), 50 km from the middle of the area, began a volume at 22:13 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
Mar 30, 6:23 PM EDT	TSTM WND GST 40	3 Ese Gifford, FL	WEATHER STATION MEASURED 35 KT/40 MPH WIND GUST.
Mar 30, 6:53 PM EDT	TSTM WND GST 44	1 Ssw Gifford, FL	KVRB AT VERO BEACH AIRPORT MEASURED 38 KT/44 MPH WIND GUST.

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
Mar 30, 11:10 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.2 hours before the alert went out and 87 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: 305 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 800 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

507 
WUUS52 KMLB 302213
SVRMLB
FLC009-061-302315-
/O.NEW.KMLB.SV.W.0009.110330T2213Z-110330T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
613 PM EDT WED MAR 30 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 715 PM EDT.

* AT 609 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED AN
  OUTFLOW BOUNDARY GENERATED BY A LINE OF SEVERE THUNDERSTORMS WHICH
  IS EXPECTED TO PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH ALONG A
  LINE FROM BAREFOOT BAY TO BLUE CYPRESS LAKE TO 6 MILES WEST OF
  BLUE CYPRESS LAKE...AND MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  MICCO...ROSELAND...FELLSMERE...SEBASTIAN INLET...SEBASTIAN INLET
  RECREATION...SEBASTIAN...VERO LAKE ESTATES...WABASSO...WINTER
  BEACH...INDIAN RIVER SHORES...GIFFORD...VERO BEACH...VERO BEACH   
SOUTH...SOUTH BEACH AND VERO BEACH HIGHLANDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS IN EXCESS OF 58 MILES AN HOUR CAN BE EXPECTED!!!

FREQUENT LIGHTNING AND VERY HEAVY RAIN WILL ALSO OCCUR. IF THE STORM 
APPROACHES YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST 
FLOOR. KEEP AWAY FROM WINDOWS.

THE LINE OF STORMS THAT PRODUCED THIS OUTFLOW BOUNDARY HAS A HISTORY 
OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS CENTRAL FLORIDA. THIS IS 
AN EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 2756 8034 2761 8036 2757 8035 2756 8035
      2757 8077 2764 8078 2765 8086 2778 8088
      2780 8074 2793 8052 2771 8040 2771 8039
      2791 8048 2788 8044 2768 8035 2769 8035
      2756 8032
TIME...MOT...LOC 2210Z 286DEG 44KT 2794 8048 2776 8079
          2772 8084

$$



CRISTALDI

2 follow-up statements

003 
WWUS52 KMLB 302248
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
648 PM EDT WED MAR 30 2011

FLC009-302257-
/O.CAN.KMLB.SV.W.0009.000000T0000Z-110330T2315Z/
BREVARD-
648 PM EDT WED MAR 30 2011

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

THE THREAT FOR WIND DAMAGE HAS SHIFTED FARTHER SOUTH INTO INDIAN 
RIVER COUNTY.

LAT...LON 2756 8034 2761 8036 2757 8035 2757 8077
      2764 8078 2765 8086 2778 8088 2782 8065
      2782 8051 2785 8048 2771 8040 2772 8039
      2784 8046 2786 8044 2768 8035 2769 8035
      2756 8032
TIME...MOT...LOC 2247Z 286DEG 44KT 2781 7999 2763 8030
          2759 8035

$$

FLC061-302315-
/O.CON.KMLB.SV.W.0009.000000T0000Z-110330T2315Z/
INDIAN RIVER-
648 PM EDT WED MAR 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR INDIAN RIVER COUNTY...

AT 644 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE AN OUTFLOW BOUNDARY CAPABLE OF PRODUCING DAMAGING WINDS IN 
EXCESS OF 60 MPH APPROACHING THE GREATER VERO BEACH AREA...MOVING 
EAST-SOUTHEAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP AWAY 
FROM WINDOWS.

&&

LAT...LON 2756 8034 2761 8036 2757 8035 2757 8077
      2764 8078 2765 8086 2778 8088 2782 8065
      2782 8051 2785 8048 2771 8040 2772 8039
      2784 8046 2786 8044 2768 8035 2769 8035
      2756 8032
TIME...MOT...LOC 2247Z 286DEG 44KT 2781 7999 2763 8030
          2759 8035

$$

878 
WWUS52 KMLB 302257
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
657 PM EDT WED MAR 30 2011

FLC061-302306-
/O.CAN.KMLB.SV.W.0009.000000T0000Z-110330T2315Z/
INDIAN RIVER-
657 PM EDT WED MAR 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR INDIAN RIVER COUNTY IS
CANCELLED...

AT 656 PM...DOPPLER RADAR INDICATED THE STORMS THAT PROMPTED THE 
WARNING HAD WEAKENED AND WERE NO LONGER CAPABLE OF PRODUCING WIND
DAMAGE. AS A RESULT...THE WARNING HAS BEEN CANCELLED.


LAT...LON 2756 8034 2761 8036 2757 8035 2757 8077
      2764 8078 2765 8086 2778 8088 2782 8065
      2782 8051 2785 8048 2771 8040 2772 8039
      2784 8046 2786 8044 2768 8035 2769 8035
      2756 8032
TIME...MOT...LOC 2256Z 286DEG 44KT 2778 7987 2760 8018
          2756 8023

$$



CRISTALDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 3:47 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange, Seminole, Volusia	73 min
Mar 30, 3:49 PM EDT	Special Weather Statement	MLB	Brevard, Indian River, Osceola, Seminole	56 min
Mar 30, 3:57 PM EDT	Special Marine Warning	MLB		93 min
Mar 30, 3:59 PM EDT	Tornado Warning	MLB	Lake	46 min
Mar 30, 4:02 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River	43 min
Mar 30, 4:29 PM EDT	Special Marine Warning	MLB		2 hr
Mar 30, 4:43 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Lake, Orange, Osceola, Seminole, Volusia	62 min
Mar 30, 5:18 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Orange, Osceola, Volusia	57 min
Mar 30, 5:30 PM EDT	Special Marine Warning	MLB		90 min
Mar 30, 6:14 PM EDT	Special Marine Warning	MLB		91 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.