Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 26, NWS Melbourne, FL

April 6, 2017Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 6, 2017, 9:09 AM EDT for Osceola County, Florida. It was in force for 66 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 6, 2017, 9:09 AM EDT (13:09 UTC)
Expired: Apr 6, 2017, 10:15 AM EDT
In force: 66 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 61 km from the middle of the area, began a volume at 13:09 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 1.2 hours before the alert went out and 101 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.

817 
WUUS52 KMLB 061309
SVRMLB
FLC097-061415-
/O.NEW.KMLB.SV.W.0026.170406T1309Z-170406T1415Z/

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

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Southeastern Osceola County in east central Florida...

* Until 1015 AM EDT

* At 909 AM EDT, a severe thunderstorm was located 11 miles south of
  Lake Kissimmee, 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. 

* This severe thunderstorm will remain over mainly rural areas of
  southeastern Osceola County.

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.

&&

LAT...LON 2780 8088 2764 8088 2764 8102 2765 8113
      2766 8113 2768 8115 2771 8115 2773 8117
      2774 8116 2775 8118 2776 8117 2783 8122
TIME...MOT...LOC 1309Z 278DEG 10KT 2775 8123 

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, 9:22 AM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.