Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 3, NWS Melbourne, FL

January 22, 20174 counties in Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jan 22, 2017, 6:39 PM EST for 4 counties in Florida. It was in force for 66 min. 2 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: Jan 22, 2017, 6:39 PM EST (23:39 UTC)
Expired: Jan 22, 2017, 7:45 PM EST
In force: 66 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 70.0 mph

Counties Lake County, FL, Orange County, FL, Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 139 km from the middle of the area, began a volume at 23:43 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
Jan 22, 6:52 PM EST	HAIL 1	Tavares, FL	DIME TO QUARTER SIZE HAIL REPORTED IN TAVARES. RETWEETED POST FROM BROADCAST MEDIA. TIME ESTIMATED.
Jan 22, 7:13 PM EST	FUNNEL CLOUD	5 W Cassia, FL	FUNNEL CLOUD REPORTED MOVING NE. DISSIPATED AT 718PM EST

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 22, 4:35 PM EST	Tornado Watch PDS	SPC	5 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.7 hours before the alert went out and 122 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: 393 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted.

422 
WUUS52 KMLB 222339
SVRMLB
FLC069-095-117-127-230045-
/O.NEW.KMLB.SV.W.0003.170122T2339Z-170123T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
639 PM EST SUN JAN 22 2017

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Northwestern Orange County in east central Florida...
  Central Lake County in east central Florida...
  Northwestern Seminole County in east central Florida...
  Northwestern Volusia County in east central Florida...

* Until 745 PM EST

* At 637 PM EST, severe thunderstorms were located near Cassia,
  Mount Dora, and Mount Plymouth, moving northeast at 40 to 50 mph.

  HAZARD...70 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings. 

* Locations impacted include...
  Deltona, Sanford, Apopka, DeLand and Eustis. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM EST for east central
Florida.

LAT...LON 2926 8142 2926 8131 2925 8130 2883 8112
      2861 8173 2891 8176 2896 8166 2901 8166
      2906 8164 2928 8164 2932 8168 2938 8142
TIME...MOT...LOC 2337Z 221DEG 36KT 2884 8149 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

DWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 22, 3:51 AM EST	Wind Advisory	MLB	Lake, Okeechobee, Orange, Osceola, Seminole, Volusia	20 hr
Jan 22, 4:10 AM EST	Gale Warning	MLB		43 hr
Jan 22, 4:10 AM EST	Small Craft Advisory	MLB		66 hr
Jan 22, 3:51 PM EST	Special Weather Statement	MLB	Lake	54 min
Jan 22, 5:54 PM EST	Severe Thunderstorm Warning	MLB	Lake, Orange	66 min
Jan 22, 6:03 PM EST	Tornado Warning	MLB	Lake, Orange	42 min
Jan 22, 6:41 PM EST	Tornado Warning	MLB	Lake	34 min
Jan 22, 6:44 PM EST	Tornado Warning	MLB	Lake, Volusia	46 min
Jan 22, 6:48 PM EST	Special Weather Statement	MLB	Orange, Seminole	42 min
Jan 22, 6:55 PM EST	Tornado Warning	MLB	Volusia	20 min

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.