Alert archive / Florida / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 13, NWS Tallahassee, FL

January 2, 2017Walton County, Washington County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Jan 2, 2017, 10:18 PM CST for Walton County, Washington County, Florida. It was in force for 27 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: Jan 2, 2017, 10:18 PM CST (04:18 UTC)
Expired: Jan 2, 2017, 10:45 PM CST
In force: 27 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 24 km from the middle of the area, began a volume at 04:18 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jan 2, 3:46 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.3 hours before the alert went out and 173 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: 202 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

As transmitted.

645 
WUUS52 KTAE 030418
SVRTAE
FLC131-133-030445-
/O.NEW.KTAE.SV.W.0013.170103T0418Z-170103T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tallahassee FL
1018 PM CST MON JAN 2 2017

The National Weather Service in Tallahassee has issued a

* Severe Thunderstorm Warning for...
  Southwestern Walton County in the Panhandle of Florida...
  Southwestern Washington County in the Panhandle of Florida...

* Until 1045 PM CST

* At 1018 PM CST, a severe thunderstorm was located 7 miles east of
  Santa Rosa Beach, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Freeport, Bunker, Seaside, Seagrove Beach, Bruce, Red Bay, Grayton
  Beach and Port Washington.

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 midnight CST for the
Panhandle of Florida.

LAT...LON 3037 8623 3040 8620 3038 8617 3038 8612
      3039 8611 3040 8612 3042 8612 3042 8614
      3043 8612 3045 8616 3047 8613 3046 8618
      3047 8620 3061 8593 3041 8591 3042 8592
      3039 8599 3033 8599 3031 8614
TIME...MOT...LOC 0418Z 232DEG 32KT 3038 8613 

HAIL...<.75IN
WIND...60MPH
 
$$

38-GODSEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 2, 6:25 PM CST	Severe Thunderstorm Warning	TAE	Bay, Holmes, Walton, Washington	80 min
Jan 2, 6:40 PM CST	Special Marine Warning	TAE		95 min
Jan 2, 7:05 PM CST	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Holmes, Jackson, Washington	55 min
Jan 2, 7:13 PM CST	Flash Flood Warning	TAE	Holmes, Jackson, Washington	3 hr
Jan 2, 7:45 PM CST	Severe Thunderstorm Warning	TAE	Jackson	60 min
Jan 2, 7:57 PM CST	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gadsden, Jackson, Liberty, Washington	63 min
Jan 2, 8:06 PM CST	Special Marine Warning	TAE		84 min
Jan 2, 8:45 PM CST	Severe Thunderstorm Warning	TAE	Gadsden, Liberty	45 min
Jan 2, 10:20 PM CST	Tornado Warning	TAE	Liberty	40 min
Jan 3, 1:30 AM CST	Special Marine Warning	TAE		60 min
Jan 3, 4:09 AM CST	Special Marine Warning	TAE		66 min
Jan 3, 2:36 PM CST	River Flood Warning	TAE	Calhoun, Franklin, Gulf, Liberty	7 days

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.