Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 23, NWS Melbourne, FL

April 5, 2011Martin County, Okeechobee County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 5, 2011, 11:59 AM EDT for Martin County, Okeechobee County, Saint Lucie County, Florida. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 5, 2011, 11:59 AM EDT (15:59 UTC)
Expired: Apr 5, 2011, 1:00 PM EDT
In force: 61 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Martin County, FL, Okeechobee County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 103 km from the middle of the area, began a volume at 16:03 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.

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, 4.0 hours before the alert went out and 142 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.

793 
WUUS52 KMLB 051559
SVRMLB
FLC085-093-111-051700-
/O.NEW.KMLB.SV.W.0023.110405T1559Z-110405T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
1159 AM EDT TUE APR 5 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARTIN COUNTY IN FLORIDA
  SOUTHERN OKEECHOBEE COUNTY IN FLORIDA
  ST. LUCIE COUNTY IN FLORIDA

* UNTIL 100 PM EDT.

* AT 1153 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 FORT PIERCE TO 8 MILES EAST OF FOUR SEASONS ESTATES...OR ALONG
  A LINE EXTENDING FROM FORT PIERCE TO 12 MILES EAST OF OKEECHOBEE...
  AND MOVING SOUTHEAST AT 30 TO 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED 
TO...PORT SAINT LUCIE...WALTON...JENSEN BEACH...STUART...PALM 
CITY...PORT SALERNO...HOBE SOUND...JUPITER ISLAND...AND JONATHAN 
DICKINSON STATE 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.

&&

LAT...LON 2714 8069 2720 8080 2714 8087 2719 8091
      2724 8098 2729 8100 2731 8104 2738 8106
      2751 8073 2755 8031 2720 8016 2717 8016
      2716 8019 2715 8015 2697 8007 2697 8014
      2695 8015 2695 8061
TIME...MOT...LOC 1555Z 304DEG 28KT 2746 8031 2729 8064

$$

GUSEMAN

1 follow-up statement

492 
WWUS52 KMLB 051634
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
1234 PM EDT TUE APR 5 2011

FLC085-093-111-051700-
/O.CON.KMLB.SV.W.0023.000000T0000Z-110405T1700Z/
OKEECHOBEE-MARTIN-ST. LUCIE-
1234 PM EDT TUE APR 5 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM EDT
FOR ST. LUCIE...MARTIN AND SOUTHEASTERN OKEECHOBEE COUNTIES...

AT 1227 PM 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 SAINT LUCIE NUCLEAR PLANT TO 11 MILES EAST OF TAYLOR
CREEK...OR ALONG A LINE EXTENDING FROM SAINT LUCIE NUCLEAR PLANT TO 
13 MILES NORTH OF PORT MAYACA...MOVING SOUTHEAST AT 30 TO 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
WALTON...WAVELAND...JENSEN BEACH...STUART...PALM CITY...PORT 
SALERNO...JUPITER ISLAND...JONATHAN DICKINSON STATE PARK AND HOBE 
SOUND

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2714 8069 2720 8080 2714 8087 2719 8091
      2724 8098 2725 8098 2739 8067 2755 8031
      2720 8016 2717 8016 2716 8019 2715 8015
      2697 8007 2697 8014 2695 8015 2695 8061
TIME...MOT...LOC 1632Z 304DEG 28KT 2731 8025 2714 8058

$$

GUSEMAN

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, 10:58 AM EDT	Severe Thunderstorm Warning	MLB	Brevard, Indian River, Okeechobee, Saint Lucie	62 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.