Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 113, NWS Jacksonville, FL

May 17, 2023Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 17, 2023, 4:24 PM EDT for Nassau County, Florida. It was in force for 51 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 17, 2023, 4:24 PM EDT (20:24 UTC)
Expired: May 17, 2023, 5:15 PM EDT
In force: 51 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 20:25 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 8.4 hours before the alert went out and 243 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: 828 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 29 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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 17, 4:13 PM EDT, 11 minutes earlier.

Area forecast discussion, May 17, 4:13 PM EDT, 11 minutes before

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In the hours before

Local storm report, May 17, 3:09 PM EDT, 1 hour 15 minutes before

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Special weather statement, May 17, 3:17 PM EDT, 1 hour 7 minutes before

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Special weather statement, May 17, 3:53 PM EDT, 31 minutes before

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Special weather statement, May 17, 4:00 PM EDT, 24 minutes before

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Special weather statement, May 17, 4:12 PM EDT, 12 minutes before

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Special weather statement, May 17, 4:21 PM EDT, 3 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
May 17, 2:06 PM EDT	Special Weather Statement	JAX	Duval	24 min
May 17, 2:09 PM EDT	Special Weather Statement	JAX	Duval	36 min
May 17, 2:15 PM EDT	Special Marine Warning	JAX		60 min
May 17, 2:15 PM EDT	Severe Thunderstorm Warning	JAX	Duval	30 min
May 17, 2:31 PM EDT	Special Weather Statement	JAX	Hamilton	44 min
May 17, 2:49 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton	41 min
May 17, 2:57 PM EDT	Special Marine Warning	JAX		63 min
May 17, 2:57 PM EDT	Special Weather Statement	JAX	Saint Johns	33 min
May 17, 3:41 PM EDT	Special Marine Warning	JAX		64 min
May 17, 4:12 PM EDT	Special Weather Statement	JAX	Nassau	48 min
May 17, 4:21 PM EDT	Special Weather Statement	JAX	Clay	24 min
May 17, 4:27 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	18 min
May 17, 4:28 PM EDT	Special Marine Warning	JAX		62 min
May 17, 4:35 PM EDT	Special Weather Statement	JAX	Nassau	40 min
May 17, 4:53 PM EDT	Special Weather Statement	JAX	Duval	37 min
May 17, 5:02 PM EDT	Special Marine Warning	JAX		88 min
May 17, 5:05 PM EDT	Special Marine Warning	JAX		55 min
May 17, 5:07 PM EDT	Special Weather Statement	JAX	Nassau	38 min
May 17, 5:09 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	36 min
May 17, 5:48 PM EDT	Special Marine Warning	JAX		57 min
May 17, 6:35 PM EDT	Special Weather Statement	JAX	Flagler	25 min
May 17, 6:58 PM EDT	Special Weather Statement	JAX	Flagler	32 min
May 17, 2:43 PM EDT	Special Weather Statement	JAX	Echols	62 min
May 17, 3:17 PM EDT	Special Weather Statement	JAX	Clinch	58 min
May 17, 3:53 PM EDT	Special Weather Statement	JAX	Charlton	52 min
May 17, 4:00 PM EDT	Special Weather Statement	JAX	Clinch	30 min
May 17, 4:55 PM EDT	Special Weather Statement	JAX	Camden	50 min
May 17, 5:23 PM EDT	Special Weather Statement	JAX	Glynn	52 min
May 17, 5:58 PM EDT	Special Weather Statement	JAX	Glynn	47 min

Nearby

Severe Thunderstorm Warnings in Florida, 2023 Every severe thunderstorm warning in 2023

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.