Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 27, NWS Melbourne, FL

April 6, 2017Okeechobee County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 6, 2017, 9:22 AM EDT for Okeechobee County, Florida. It was in force for 53 min. 3 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: Apr 6, 2017, 9:22 AM EDT (13:22 UTC)
Expired: Apr 6, 2017, 10:15 AM EDT
In force: 53 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

County Okeechobee County, FL

The radar

The Melbourne radar (KMLB), 78 km from the middle of the area, began a volume at 13:20 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
Apr 6, 9:30 AM EDT	TSTM WND DMG	2 E Kissimmee Prairie P, FL	* 3 INJ * POSSIBLE DAMAGE FROM A TORNADO. KISSIMMEE PRAIRIE PRESERVE STATE PARK BIOLOGIST REPORTS A FEW FLIPPED CAMPERS, SOME BIG TREES UPROOTED, SHEET METAL LODGED IN A TREE. INJURIES WERE FROM PEOPLE INSIDE CAMPERS WHEN THEY FLIPPED. DAMAGE REPORTED IS C
Apr 6, 9:40 AM EDT	TSTM WND DMG	3 Nnw Fort Drum, FL	PRIVATE CITIZEN REPORTS DOWNED TREES ON THE ROAD AT THE INTERSECTION OF US-441 AND NW 353TH STREET NEAR FT. DRUM.
Apr 6, 9:50 AM EDT	TSTM WND DMG	3 Nnw Fort Drum, FL	POTENTIAL TORNADO DAMAGE. PER FDEM STATE WATCH OFFICE...OKEECHOBEE SHERIFFS OFFICE REPORTS DAMAGE TO HOMES NORTH OF FT. DRUM...APPROXIMATE LOCATION IS 1335 NE 342ND TRAIL. NO WORD ON EXTENT OF DAMAGE. TIMING OF DAMAGE IS APPROXIMATE USING RADAR.

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, 1.4 hours before the alert went out and 120 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: 1944 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 765 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 269 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 3.1
Supercell composite: 14.3

Open this sounding in Storm Lab

The text

As transmitted.

791 
WUUS52 KMLB 061322
SVRMLB
FLC093-061415-
/O.NEW.KMLB.SV.W.0027.170406T1322Z-170406T1415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
922 AM EDT THU APR 6 2017

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Northern Okeechobee County in east central Florida...

* Until 1015 AM EDT

* At 921 AM EDT, a severe thunderstorm was located near Kissimmee
  Prarie Preserve, or 14 miles northwest of Basinger, moving east at
  35 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Kissimmee Prarie Preserve.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 2747 8117 2748 8118 2748 8119 2756 8118
      2760 8114 2765 8114 2764 8080 2741 8085
TIME...MOT...LOC 1321Z 273DEG 15KT 2757 8115 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Johnson

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 3:55 AM EDT	Fire Weather Watch	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	14 hr
Apr 6, 3:55 AM EDT	Red Flag Warning	MLB	Lake, Orange, Osceola, Seminole, Volusia	14 hr
Apr 6, 4:31 AM EDT	Special Weather Statement	MLB	Lake	59 min
Apr 6, 5:48 AM EDT	Special Weather Statement	MLB	Volusia	42 min
Apr 6, 6:00 AM EDT	Special Marine Warning	MLB		90 min
Apr 6, 7:54 AM EDT	Special Weather Statement	MLB	Osceola	51 min
Apr 6, 8:36 AM EDT	Special Weather Statement	MLB	Okeechobee	54 min
Apr 6, 9:09 AM EDT	Severe Thunderstorm Warning	MLB	Osceola	66 min
Apr 6, 9:31 AM EDT	Tornado Warning	MLB	Okeechobee	44 min
Apr 6, 9:52 AM EDT	Tornado Warning	MLB	Indian River	23 min
Apr 6, 10:13 AM EDT	Tornado Warning	MLB	Indian River	32 min
Apr 6, 10:21 AM EDT	Special Marine Warning	MLB		84 min
Apr 6, 10:50 AM EDT	Special Weather Statement	MLB	Indian River	40 min
Apr 6, 11:44 AM EDT	Special Marine Warning	MLB		91 min
Apr 6, 6:11 PM EDT	Red Flag Warning	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	26 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2017 Every severe thunderstorm warning in 2017

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.