Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 52, NWS Jacksonville, FL

April 13, 2020Alachua County, Bradford County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 13, 2020, 3:57 PM EDT for Alachua County, Bradford County, Florida. It was in force for 33 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: Apr 13, 2020, 3:57 PM EDT (19:57 UTC)
Expired: Apr 13, 2020, 4:30 PM EDT
In force: 33 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Alachua County, FL, Bradford County, FL

The radar

The Jacksonville radar (KJAX), 92 km from the middle of the area, began a volume at 19:57 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, 8.0 hours before the alert went out and 94 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: 1152 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 550 m²/s²
0-3 km storm-relative helicity: 743 m²/s²
Significant tornado parameter: 4.7
Supercell composite: 16.6

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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 13, 2:22 PM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Apr 13, 2:22 PM EDT, 1 hour 35 minutes before

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In the hours before

Special weather statement, Apr 13, 12:04 PM EDT, 3 hours 53 minutes before

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Local storm report, Apr 13, 12:30 PM EDT, 3 hours 27 minutes before

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Special weather statement, Apr 13, 12:45 PM EDT, 3 hours 12 minutes before

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Local storm report, Apr 13, 1:15 PM EDT, 2 hours 42 minutes before

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Local storm report, Apr 13, 2:26 PM EDT, 1 hour 31 minutes before

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Special weather statement, Apr 13, 3:40 PM EDT, 17 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 3:28 AM EDT	Small Craft Advisory	JAX		12 hr
Apr 13, 7:20 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton	55 min
Apr 13, 8:12 AM EDT	Severe Thunderstorm Warning	JAX	Hamilton	63 min
Apr 13, 8:18 AM EDT	Special Marine Warning	JAX		3 hr
Apr 13, 8:35 AM EDT	Severe Thunderstorm Warning	JAX	Columbia, Hamilton, Suwannee	55 min
Apr 13, 9:08 AM EDT	Severe Thunderstorm Warning	JAX	Nassau	67 min
Apr 13, 9:15 AM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Suwannee	60 min
Apr 13, 10:05 AM EDT	Special Weather Statement	JAX	Nassau	55 min
Apr 13, 10:12 AM EDT	Severe Thunderstorm Warning	JAX	Baker, Columbia, Hamilton, Suwannee	63 min
Apr 13, 10:18 AM EDT	Special Marine Warning	JAX		57 min
Apr 13, 10:55 AM EDT	Special Weather Statement	JAX	Baker, Columbia, Nassau	50 min
Apr 13, 11:10 AM EDT	Special Marine Warning	JAX		2 hr
Apr 13, 11:39 AM EDT	Special Weather Statement	JAX	Nassau	51 min
Apr 13, 12:04 PM EDT	Special Weather Statement	JAX	Duval	41 min
Apr 13, 12:45 PM EDT	Special Weather Statement	JAX	Duval	45 min
Apr 13, 12:58 PM EDT	Special Marine Warning	JAX		92 min
Apr 13, 3:40 PM EDT	Special Weather Statement	JAX	Bradford	50 min
Apr 13, 4:14 PM EDT	Special Weather Statement	JAX	Clay	46 min
Apr 13, 4:17 PM EDT	Severe Thunderstorm Warning	JAX	Bradford, Clay	43 min
Apr 13, 4:24 PM EDT	Special Marine Warning	JAX		2 hr
Apr 13, 4:42 PM EDT	Special Weather Statement	JAX	Putnam	33 min
Apr 13, 4:46 PM EDT	Special Weather Statement	JAX	Saint Johns	44 min
Apr 13, 4:48 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Putnam, Saint Johns	42 min
Apr 13, 5:39 PM EDT	Special Marine Warning	JAX		96 min
Apr 13, 4:40 AM EDT	Special Weather Statement	JAX	Appling, Coffee, Jeff Davis	80 min
Apr 13, 5:31 AM EDT	Severe Thunderstorm Warning	JAX	Coffee, Jeff Davis	59 min
Apr 13, 5:50 AM EDT	Severe Thunderstorm Warning	JAX	Atkinson, Coffee	55 min
Apr 13, 6:20 AM EDT	Tornado Warning	JAX	Atkinson, Coffee	29 min
Apr 13, 6:33 AM EDT	Tornado Warning	JAX	Bacon, Coffee, Jeff Davis	23 min
Apr 13, 6:35 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Jeff Davis, Pierce and 2 more	55 min
Apr 13, 6:55 AM EDT	Tornado Warning	JAX	Appling, Bacon	26 min
Apr 13, 7:09 AM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Brantley, Glynn, Pierce, Ware and 1 more	66 min
Apr 13, 7:14 AM EDT	Tornado Warning	JAX	Appling, Wayne	35 min
Apr 13, 8:15 AM EDT	Severe Thunderstorm Warning	JAX	Brantley, Glynn, Wayne	45 min
Apr 13, 8:44 AM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Charlton, Glynn	47 min
Apr 13, 9:50 AM EDT	Special Weather Statement	JAX	Clinch	25 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning in 2020

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.