Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 99, NWS Jacksonville, FL

April 30, 2023Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 30, 2023, 5:18 AM EDT for Putnam 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 counties it named.

The facts

Issued: Apr 30, 2023, 5:18 AM EDT (09:18 UTC)
Expired: Apr 30, 2023, 5:45 AM EDT
In force: 27 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Putnam County, FL

The radar

The Jacksonville radar (KJAX), 97 km from the middle of the area, began a volume at 09:19 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
Apr 30, 5:03 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 00:00Z, 9.3 hours before the alert went out and 175 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: 182 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.2

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 30, 2:55 AM EDT, 2 hours 23 minutes earlier.

Area forecast discussion, Apr 30, 2:55 AM EDT, 2 hours 23 minutes before

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In the hours before

Special weather statement, Apr 30, 4:26 AM EDT, 52 minutes before

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Special weather statement, Apr 30, 4:36 AM EDT, 42 minutes before

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Special weather statement, Apr 30, 4:56 AM EDT, 22 minutes before

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Local storm report, Apr 30, 5:01 AM EDT, 17 minutes before

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Special weather statement, Apr 30, 5:07 AM EDT, 11 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 30, 2:06 AM EDT	Wind Advisory	JAX	Clay, Duval, Flagler, Marion, Nassau, Putnam	16 hr
Apr 30, 4:26 AM EDT	Special Weather Statement	JAX	Baker	19 min
Apr 30, 4:36 AM EDT	Special Weather Statement	JAX	Marion	24 min
Apr 30, 4:56 AM EDT	Special Weather Statement	JAX	Bradford, Union	19 min
Apr 30, 5:07 AM EDT	Special Weather Statement	JAX	Marion, Putnam	23 min
Apr 30, 5:32 AM EDT	Special Weather Statement	JAX	Marion	13 min
Apr 30, 5:41 AM EDT	Special Weather Statement	JAX	Putnam, Saint Johns	19 min
Apr 30, 5:46 AM EDT	Special Weather Statement	JAX	Nassau	14 min
Apr 30, 5:48 AM EDT	Special Weather Statement	JAX	Clay	12 min
Apr 30, 6:05 AM EDT	Special Weather Statement	JAX	Duval	25 min
Apr 30, 7:00 AM EDT	Special Weather Statement	JAX	Flagler	30 min
Apr 30, 7:11 AM EDT	Special Marine Warning	JAX		34 min
Apr 30, 7:35 AM EDT	Special Marine Warning	JAX		55 min
Apr 30, 1:33 PM EDT	Small Craft Advisory	JAX		15 hr

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.