Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 101, NWS Melbourne, FL

August 16, 2011Martin County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 16, 2011, 4:56 PM EDT for Martin County, Florida. It was in force for 29 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: Aug 16, 2011, 4:56 PM EDT (20:56 UTC)
Expired: Aug 16, 2011, 5:25 PM EDT
In force: 29 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Martin County, FL

The radar

The Melbourne radar (KMLB), 132 km from the middle of the area, began a volume at 20:59 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 nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.9 hours before the alert went out and 132 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: 2673 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

791 
WUUS52 KMLB 162056
SVRMLB
FLC085-162200-
/O.NEW.KMLB.SV.W.0101.110816T2056Z-110816T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
456 PM EDT TUE AUG 16 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN MARTIN COUNTY IN FLORIDA

* UNTIL 600 PM EDT.

* AT 454 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  JONATHAN DICKINSON STATE PARK...OR NEAR JUPITER...AND MOVING   
NORTHEAST AT 5 MPH. ANOTHER STRONG TO SEVERE STORM WAS LOCATED OVER 
RURAL SOUTHERN MARTIN COUNTY. 

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  JOHNATHAN DICKINSON STATE PARK...HOBE SOUND...JUPITER ISLAND AND   
HOBE SOUND 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 2695 8019 2695 8035 2700 8042 2714 8015
      2713 8014 2703 8009 2697 8007 2697 8014
      2695 8015 2695 8017
TIME...MOT...LOC 2056Z 227DEG 6KT 2698 8017

$$


KELLY

1 follow-up statement

042 
WWUS52 KMLB 162125
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
525 PM EDT TUE AUG 16 2011

FLC085-162133-
/O.CAN.KMLB.SV.W.0101.000000T0000Z-110816T2200Z/
MARTIN-
525 PM EDT TUE AUG 16 2011

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

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A 
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...GUSTY WINDS HEAVY 
RAIN AND DANGEROUS LIGHTNING STRIKES WILL CONTINUE. A FLOOD ADVISORY 
IS IN EFFECT UNTIL 715 PM.

LAT...LON 2695 8019 2695 8035 2700 8042 2714 8015
      2713 8014 2703 8009 2697 8007 2697 8014
      2695 8015 2695 8017
TIME...MOT...LOC 2123Z 227DEG 6KT 2701 8013

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 2:04 PM EDT	Special Marine Warning	MLB		116 min
Aug 16, 2:36 PM EDT	Special Weather Statement	MLB	Brevard	39 min
Aug 16, 3:30 PM EDT	Tornado Warning	MLB	Indian River	49 min
Aug 16, 4:00 PM EDT	Areal Flood Advisory	MLB	Indian River	90 min
Aug 16, 4:28 PM EDT	Special Weather Statement	MLB	Saint Lucie	62 min
Aug 16, 4:49 PM EDT	Special Weather Statement	MLB	Martin	41 min
Aug 16, 5:10 PM EDT	Special Weather Statement	MLB	Orange	65 min
Aug 16, 5:17 PM EDT	Areal Flood Advisory	MLB	Martin	118 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.