Alert archive / Florida / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 230, NWS Tallahassee, FL

August 30, 2018Jefferson County, Madison County, Taylor County, Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Aug 30, 2018, 5:15 PM EDT for Jefferson County, Madison County, Taylor County, Florida. It was in force for 45 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: Aug 30, 2018, 5:15 PM EDT (21:15 UTC)
Expired: Aug 30, 2018, 6:00 PM EDT
In force: 45 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Jefferson County, FL, Madison County, FL, Taylor County, FL

The radar

The Tallahassee radar (KTLH), 65 km from the middle of the area, began a volume at 21:15 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

Jacksonville, FL (KJAX), launched 12:00Z, 9.3 hours before the alert went out and 190 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: 1520 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 808 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 30, 3:09 PM EDT, 2 hours 6 minutes earlier.

Area forecast discussion, Aug 30, 3:09 PM EDT, 2 hours 6 minutes before

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In the hours before

Special weather statement, Aug 30, 2:49 PM EDT, 2 hours 26 minutes before

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Special weather statement, Aug 30, 3:05 PM EDT, 2 hours 10 minutes before

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Special weather statement, Aug 30, 4:03 PM EDT, 1 hour 12 minutes before

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Special weather statement, Aug 30, 4:10 PM EDT, 1 hour 5 minutes before

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Special weather statement, Aug 30, 4:46 PM EDT, 29 minutes before

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Special weather statement, Aug 30, 4:54 PM EDT, 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 11:41 AM EDT	Special Marine Warning	TAE		64 min
Aug 30, 12:39 PM EDT	Special Marine Warning	TAE		66 min
Aug 30, 2:41 PM EDT	Special Marine Warning	TAE		34 min
Aug 30, 2:49 PM EDT	Special Weather Statement	TAE	Calhoun	26 min
Aug 30, 2:58 PM EDT	Special Marine Warning	TAE		29 min
Aug 30, 3:05 PM EDT	Special Weather Statement	TAE	Holmes, Walton, Washington	55 min
Aug 30, 4:10 PM EDT	Special Weather Statement	TAE	Dixie, Lafayette, Madison	50 min
Aug 30, 4:12 PM EDT	Special Marine Warning	TAE		2 hr
Aug 30, 4:46 PM EDT	Special Weather Statement	TAE	Madison, Taylor	59 min
Aug 30, 5:38 PM EDT	Special Marine Warning	TAE		96 min
Aug 30, 5:54 PM EDT	Special Weather Statement	TAE	Jefferson, Leon, Wakulla	51 min
Aug 30, 6:42 PM EDT	Special Weather Statement	TAE	Wakulla	33 min
Aug 30, 4:03 PM EDT	Special Weather Statement	TAE	Seminole	42 min
Aug 30, 4:54 PM EDT	Special Weather Statement	TAE	Berrien, Brooks, Cook, Lowndes, Tift	51 min

Nearby

Severe Thunderstorm Warnings in Florida, 2018 Every severe thunderstorm warning in 2018

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.