Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 5, NWS Melbourne, FL

March 30, 20114 counties in Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 30, 2011, 3:47 PM EDT for 4 counties in Florida. It was in force for 73 min. 21 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, 3:47 PM EDT (19:47 UTC)
Expired: Mar 30, 2011, 5:00 PM EDT
In force: 73 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

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

The radar

The Melbourne radar (KMLB), 126 km from the middle of the area, began a volume at 19:50 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, 4:15 PM EDT	TSTM WND DMG	5 N Mascotte, FL	MULTIPLE LARGE TREE LIMBS DOWN.
Mar 30, 4:15 PM EDT	TSTM WND GST 56	Leesburg, FL	KLEE ASOS AT LEESBURG AIRPORT MEASURED 49 KT/56 MPH WIND GUST.
Mar 30, 4:20 PM EDT	TSTM WND DMG	1 Nnw Eustis, FL	VERY LARGE OAK TREE UPROOTED. MULTIPLE 4 TO 5 INCH DIAMETER BRANCHES ON THE GROUND.
Mar 30, 4:23 PM EDT	TSTM WND DMG	Plymouth, FL	TREES AND POWER LINES DOWN. GREENHOUSE DAMAGED.
Mar 30, 4:30 PM EDT	TSTM WND DMG	2 Ne Eustis, FL	ONE TREE DOWN
Mar 30, 4:30 PM EDT	TSTM WND DMG	5 Nne Orange City, FL	* 1 INJ * TREE FELL ON HOUSE ON KENTUCKY AVE IN DELAND, TRAPPING A FAMILY INSIDE.
Mar 30, 4:30 PM EDT	TSTM WND DMG	Mount Dora, FL	ONE LARGE TREE DOWN ON ROUTE 46.
Mar 30, 4:35 PM EDT	TSTM WND DMG	Debary, FL	2 TREES DOWN.
Mar 30, 4:39 PM EDT	TSTM WND GST 60	4 W Altamonte Springs, FL	ESTIMATED 60+ MPH SUSTAINED WINDS. TREE LIMBS DOWN AND POWER OUT.
Mar 30, 4:40 PM EDT	TSTM WND DMG	Tavares, FL	MULTIPLE TREES DOWN ON ACORN COURT.
Mar 30, 4:44 PM EDT	TSTM WND GST 74	3 Wnw Azalea Park, FL	KORL AT ORLANDO EXECUTIVE AIRPORT MEASURED 65 KT/74 MPH WIND GUST.
Mar 30, 4:45 PM EDT	TSTM WND DMG	Altamonte Springs, FL	TREES DOWN AT NORTH ST AND SUNILAND ST BLOCKING ROADWAY.
Mar 30, 4:45 PM EDT	TSTM WND DMG	Lake Mary, FL	TREES DOWN ON 5 CARS IN WOFL PARKING LOT.
Mar 30, 4:45 PM EDT	TSTM WND DMG	Orlando, FL	ONE TREE DOWN AT GOLDENROD AND SUNVISTA ROADS.
Mar 30, 4:45 PM EDT	TSTM WND DMG	Sanford, FL	FENCE BLOWN ACROSS THE ROAD AND FIBERGLASS TABLETOP BLOWN OFF. FENCE POSTS SNAPPED OFF.
Mar 30, 4:45 PM EDT	TSTM WND DMG	Winter Springs, FL	8 HOMES DAMAGED NEAR LA VISTA WAY. EXTENT UNKNOWN.
Mar 30, 4:47 PM EDT	TSTM WND DMG	Debary, FL	TWO LARGE TREES DOWN ON A HOME ON SMYRNA DRIVE.
Mar 30, 4:48 PM EDT	TSTM WND GST 65	4 Nnw Lake Jessup, FL	KSFB AT ORLANDO SANFORD AIRPORT MEASURED 57 KT/65 MPH WIND GUST.
Mar 30, 4:50 PM EDT	TSTM WND DMG	Deland, FL	TREE DOWN PARTIALLY BLOCKING ROAD ON 2ND STREET AT CYPRUS ST.
Mar 30, 4:55 PM EDT	TSTM WND DMG	1 Se Winter Park, FL	ONE LARGE OAK TREE UPROOTED AT CORNER OF DUNBLANE AND WHITEHALL. TIME ESTIMATED BY RADAR.
Mar 30, 5:00 PM EDT	TSTM WND GST 63	6 Sw Astor, FL	POWER LINES AND TREES DOWN IN OCALA NATIONAL FOREST. HELICOPTER PIVOTED ON ITS PAD.

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, 7.8 hours before the alert went out and 117 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.

246 
WUUS52 KMLB 301947
SVRMLB
FLC069-095-117-127-302100-
/O.NEW.KMLB.SV.W.0005.110330T1947Z-110330T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
347 PM EDT WED MAR 30 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
  WESTERN VOLUSIA COUNTY IN FLORIDA

* UNTIL 500 PM EDT.

* AT 341 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 29 MILES WEST OF THE
  VILLAGES TO 27 MILES WEST OF MASCOTTE...AND MOVING EAST AT 55 TO
  60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO
  ...LADY LAKE...LEESBURG...LAKE HARRIS...CLERMONT...APOPKA...
  LAKE GEORGE...THE ATTRACTIONS AREA...WINTER GARDEN...APOPKA...
  WINDERMERE...DE LEON SPRINGS...DE LAND...ALTAMONTE SPRINGS...
  LONGWOOD...SANFORD...ORLANDO...LAKE HELEN...MAITLAND...AND WINTER
  PARK.

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 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.

IF ON OR NEAR AN INLAND LAKE...GET OUT OF THE WATER AND MOVE INDOORS 
OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES 
FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE 
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW. 
DON'T BE CAUGHT ON THE WATER IN A THUNDERSTORM!

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

&&

LAT...LON 2896 8196 2896 8166 2929 8165 2932 8168
      2940 8142 2927 8141 2927 8129 2908 8123
      2878 8122 2834 8143 2834 8173 2834 8179
      2835 8180 2834 8196
TIME...MOT...LOC 1943Z 263DEG 51KT 2909 8237 2897 8230
          2886 8227 2879 8230 2867 8229 2851 8243

$$



CRISTALDI

3 follow-up statements

441 
WWUS52 KMLB 302022
SVSMLB

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

FLC069-095-117-127-302100-
/O.CON.KMLB.SV.W.0005.000000T0000Z-110330T2100Z/
ORANGE-SEMINOLE-LAKE-VOLUSIA-
422 PM EDT WED MAR 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR WESTERN VOLUSIA...LAKE...WESTERN SEMINOLE AND WESTERN ORANGE
COUNTIES...

AT 418 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM 6 MILES WEST OF PITTMAN TO 
LAKE YALE TO LAKE EUSTIS TO ASTATULA TO GROVELAND...MOVING EAST AT 
60 MPH.

THIS LINE WILL AFFECT ALL COMMUNITIES ACROSS LAKE...NORTHWEST 
VOLUSIA...AND WESTERN AND CENTRAL SEMINOLE AND ORANGE COUNTIES.

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.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE ACROSS THE 
LEESBURG AREA. THIS IS AN EXTREMELY DANGEROUS SITUATION. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

&&

LAT...LON 2858 8196 2862 8188 2880 8177 2896 8189
      2896 8166 2906 8166 2906 8164 2929 8165
      2932 8168 2940 8142 2927 8141 2927 8129
      2908 8123 2878 8122 2835 8142 2834 8143
      2834 8196
TIME...MOT...LOC 2020Z 263DEG 51KT 2915 8177 2903 8170
          2892 8167 2885 8171 2873 8170 2857 8184

$$



CRISTALDI

808 
WWUS52 KMLB 302052
SVSMLB

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

FLC069-302101-
/O.CAN.KMLB.SV.W.0005.000000T0000Z-110330T2100Z/
LAKE-
452 PM EDT WED MAR 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR LAKE COUNTY IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

LAT...LON 2908 8123 2878 8122 2834 8143 2835 8166
      2840 8166 2857 8155 2872 8140 2886 8131
      2909 8133 2917 8138 2927 8141 2927 8129
TIME...MOT...LOC 2051Z 263DEG 51KT 2920 8127 2908 8120
          2897 8117 2890 8121 2878 8120 2862 8134

$$

FLC095-117-127-302100-
/O.CON.KMLB.SV.W.0005.000000T0000Z-110330T2100Z/
ORANGE-SEMINOLE-VOLUSIA-
452 PM EDT WED MAR 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN 
VOLUSIA...WESTERN SEMINOLE AND WESTERN ORANGE COUNTIES...

THIS AREA IS COVERED BY AN UPDATED SEVERE THUNDERSTORM WARNING THAT
WAS ISSUED AT 447 PM.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

&&

LAT...LON 2908 8123 2878 8122 2834 8143 2835 8166
      2840 8166 2857 8155 2872 8140 2886 8131
      2909 8133 2917 8138 2927 8141 2927 8129
TIME...MOT...LOC 2051Z 263DEG 51KT 2920 8127 2908 8120
          2897 8117 2890 8121 2878 8120 2862 8134

$$

550 
WWUS52 KMLB 302053
SVSMLB

SEVERE WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE MELBOURNE FL
453 PM EDT WED MAR 30 2011

FLC069-302101-
/O.CAN.KMLB.SV.W.0005.000000T0000Z-110330T2100Z/
LAKE-
453 PM EDT WED MAR 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR LAKE COUNTY IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

LAT...LON 2908 8123 2878 8122 2834 8143 2835 8166
      2840 8166 2857 8155 2872 8140 2886 8131
      2909 8133 2917 8138 2927 8141 2927 8129
TIME...MOT...LOC 2051Z 263DEG 51KT 2920 8127 2908 8120
          2897 8117 2890 8121 2878 8120 2862 8134

$$

FLC095-117-127-302100-
/O.CON.KMLB.SV.W.0005.000000T0000Z-110330T2100Z/
ORANGE-SEMINOLE-VOLUSIA-
453 PM EDT WED MAR 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN 
VOLUSIA...WESTERN SEMINOLE AND WESTERN ORANGE COUNTIES...

THIS AREA IS COVERED BY AN UPDATED SEVERE THUNDERSTORM WARNING THAT
WAS ISSUED AT 443 PM.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING
FOR EAST CENTRAL FLORIDA.

&&

LAT...LON 2908 8123 2878 8122 2834 8143 2835 8166
      2840 8166 2857 8155 2872 8140 2886 8131
      2909 8133 2917 8138 2927 8141 2927 8129
TIME...MOT...LOC 2051Z 263DEG 51KT 2920 8127 2908 8120
          2897 8117 2890 8121 2878 8120 2862 8134

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 6:13 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River	44 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.