Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 66, NWS Melbourne, FL

June 17, 2011Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 17, 2011, 4:06 PM EDT for Osceola County, Florida. It was in force for 39 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: Jun 17, 2011, 4:06 PM EDT (20:06 UTC)
Expired: Jun 17, 2011, 4:45 PM EDT
In force: 39 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 48 km from the middle of the area, began a volume at 20:08 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
Jun 17, 4:45 PM EDT	HAIL 1	1 Se Holopaw, FL	SPOTTER REPORTED QUARTER-SIZED HAIL ON MERCURY DRIVE IN HOLOPAW.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 8.1 hours before the alert went out and 80 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: 587 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 5 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.

100 
WUUS52 KMLB 172006
SVRMLB
FLC097-172045-
/O.NEW.KMLB.SV.W.0066.110617T2006Z-110617T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
406 PM EDT FRI JUN 17 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL OSCEOLA COUNTY IN FLORIDA

* UNTIL 445 PM EDT.

* AT 404 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
  LAKE MARIAN...AND MOVING NORTH AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  HOLOPAW

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.

IF ON OR NEAR ANY LAKES IN THE PATH OF THIS STORM...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!

&&

LAT...LON 2814 8126 2816 8096 2781 8098 2780 8119
TIME...MOT...LOC 2006Z 176DEG 7KT 2790 8109

$$
BOWEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 2:55 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	50 min
Jun 17, 3:41 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	49 min
Jun 17, 3:47 PM EDT	Special Weather Statement	MLB	Okeechobee	58 min
Jun 17, 4:14 PM EDT	Severe Thunderstorm Warning	MLB	Martin	31 min
Jun 17, 4:45 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	44 min
Jun 17, 5:15 PM EDT	Special Weather Statement	MLB	Orange	60 min
Jun 17, 5:49 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	56 min
Jun 17, 6:02 PM EDT	Severe Thunderstorm Warning	MLB	Seminole, Volusia	58 min
Jun 17, 6:11 PM EDT	Special Weather Statement	MLB	Lake	49 min
Jun 17, 6:36 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	54 min
Jun 17, 6:48 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	57 min
Jun 17, 7:02 PM EDT	Special Marine Warning	MLB		118 min
Jun 17, 7:17 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	42 min
Jun 17, 7:32 PM EDT	Special Weather Statement	MLB	Volusia	43 min
Jun 17, 7:41 PM EDT	Areal Flood Advisory	MLB	Lake, Volusia	2 hr
Jun 17, 7:41 PM EDT	Special Weather Statement	MLB	Lake	49 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.