Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 127, NWS Tallahassee, FL

May 12, 2019Holmes County, Walton County, Florida; Geneva County, Alabama

NWS Tallahassee, FL issued this severe thunderstorm warning at May 12, 2019, 9:10 AM CDT for Holmes County, Walton County, Florida; Geneva County, Alabama. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 12, 2019, 9:10 AM CDT (14:10 UTC)
Expired: May 12, 2019, 10:00 AM CDT
In force: 50 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Geneva County, AL, Holmes County, FL, Walton County, FL

The radar

The Eglin Afb radar (KEVX), 33 km from the middle of the area, began a volume at 14:14 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
May 12, 8:59 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.2 hours before the alert went out and 165 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: 659 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 847 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 12, 5:40 AM CDT, 3 hours 30 minutes earlier.

Area forecast discussion, May 12, 5:40 AM CDT, 3 hours 30 minutes before

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In the hours before

Special weather statement, May 12, 4:13 AM CDT, 4 hours 57 minutes before

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Special weather statement, May 12, 7:26 AM CDT, 1 hour 44 minutes before

Special Weather Statement
National Weather Service Tallahassee FL
726 AM CDT SUN MAY 12 2019

FLZ008-108-121315-
Central Walton FL-South Walton FL-
726 AM CDT SUN MAY 12 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN WALTON COUNTY UNTIL
815 AM CDT...

At 726 AM CDT, Doppler radar was tracking a strong thunderstorm over
Destin, moving northeast at 25 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Santa Rosa Beach, Eglin Air Force Base, Freeport, Portland, Villa
Tasso, Gulf Pines, New Home, Sandestin, Miramar Beach and Four Mile
Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3038 8633 3045 8631 3048 8632 3046 8639
      3054 8639 3064 8621 3039 8606 3039 8610
      3042 8614 3043 8612 3044 8616 3048 8614
      3046 8616 3046 8619 3042 8622 3038 8614
      3034 8640 3040 8640
TIME...MOT...LOC 1226Z 244DEG 20KT 3037 8651

15-HARRIGAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 2:43 AM CDT	Rip Current Statement	TAE	Bay, Franklin, Gulf, Walton	20 hr
May 12, 4:13 AM CDT	Special Weather Statement	TAE	Holmes	47 min
May 12, 7:26 AM CDT	Special Weather Statement	TAE	Walton	49 min
May 12, 9:43 AM CDT	Special Marine Warning	TAE		2 hr
May 12, 9:58 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Holmes, Jackson, Walton, Washington	47 min
May 12, 10:03 AM CDT	Severe Thunderstorm Warning	TAE	Holmes, Jackson	42 min
May 12, 10:42 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gulf, Jackson, Washington	48 min
May 12, 10:48 AM CDT	Special Weather Statement	TAE	Jackson	42 min
May 12, 11:02 AM CDT	Special Marine Warning	TAE		118 min
May 12, 11:12 AM CDT	Severe Thunderstorm Warning	TAE	Gadsden, Jackson	33 min
May 12, 11:23 AM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Gadsden, Gulf, Jackson, Leon and 1 more	37 min
May 12, 11:41 AM CDT	Special Marine Warning	TAE		94 min
May 12, 11:57 AM CDT	Special Weather Statement	TAE	Gadsden, Leon, Liberty	48 min
May 12, 12:22 PM CDT	Special Weather Statement	TAE	Bay, Calhoun, Gulf, Liberty	38 min
May 12, 12:33 PM CDT	Severe Thunderstorm Warning	TAE	Bay, Calhoun, Franklin, Gulf, Liberty	42 min
May 12, 12:40 PM CDT	Special Weather Statement	TAE	Jefferson, Leon, Wakulla	50 min
May 12, 12:51 PM CDT	Special Marine Warning	TAE		84 min
May 12, 12:52 PM CDT	Severe Thunderstorm Warning	TAE	Jefferson, Leon, Madison	38 min
May 12, 1:10 PM CDT	Special Weather Statement	TAE	Franklin, Wakulla	35 min
May 12, 1:30 PM CDT	Special Weather Statement	TAE	Jefferson	45 min
May 12, 1:54 PM CDT	Special Marine Warning	TAE		66 min
May 12, 2:10 PM CDT	Special Marine Warning	TAE		65 min
May 12, 2:49 PM CDT	Special Weather Statement	TAE	Lafayette	41 min
May 12, 3:00 PM CDT	Special Marine Warning	TAE		49 min
May 12, 3:08 PM CDT	Special Marine Warning	TAE		67 min
May 12, 3:59 PM CDT	Special Marine Warning	TAE		61 min
May 12, 4:51 PM CDT	Special Marine Warning	TAE		54 min
May 12, 10:37 AM CDT	Severe Thunderstorm Warning	TAE	Early	23 min
May 12, 10:55 AM CDT	Severe Thunderstorm Warning	TAE	Calhoun, Clay, Early, Miller, Randolph	35 min
May 12, 11:28 AM CDT	Severe Thunderstorm Warning	TAE	Baker, Calhoun, Clay, Dougherty, Early, Miller and 3 more	47 min
May 12, 11:42 AM CDT	Severe Thunderstorm Warning	TAE	Baker, Calhoun, Decatur, Dougherty, Early, Grady and 6 more	33 min
May 12, 12:15 PM CDT	Severe Thunderstorm Warning	TAE	Baker, Brooks, Colquitt, Decatur, Dougherty, Grady and 6 more	45 min
May 12, 12:29 PM CDT	Special Weather Statement	TAE	Lee, Turner	31 min
May 12, 12:43 PM CDT	Severe Thunderstorm Warning	TAE	Lee, Turner, Worth	32 min
May 12, 1:00 PM CDT	Severe Thunderstorm Warning	TAE	Ben Hill, Irwin, Tift, Turner, Worth	45 min
May 12, 1:11 PM CDT	Special Weather Statement	TAE	Tift	49 min
May 12, 1:22 PM CDT	Severe Thunderstorm Warning	TAE	Berrien, Brooks, Cook, Lanier, Lowndes	53 min
May 12, 1:36 PM CDT	Special Weather Statement	TAE	Ben Hill	39 min
May 12, 9:33 AM CDT	Severe Thunderstorm Warning	TAE	Coffee, Dale, Geneva, Houston	27 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019 Severe Thunderstorm Warnings in Alabama, 2019 Every severe thunderstorm warning in 2019

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.