Alert archive / Florida / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 211, NWS Jacksonville, FL

August 18, 2026Flagler County, Marion County, Putnam County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 18, 2026, 6:58 PM EDT for Flagler County, Marion County, Putnam County, Florida. It was in force for 32 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 18, 2026, 6:58 PM EDT (22:58 UTC)
Expired: Aug 18, 2026, 7:30 PM EDT
In force: 32 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Flagler County, FL, Marion County, FL, Putnam County, FL

The radar

The Jacksonville radar (KJAX), 117 km from the middle of the area, began a volume at 23:01 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, 11.0 hours before the alert went out and 119 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: 2506 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 12:32 PM EDT	Heat Advisory	JAX	Alachua, Baker, Bradford, Clay, Columbia, Duval and 9 more	31 hr
Aug 18, 3:20 PM EDT	Special Weather Statement	JAX	Duval	40 min
Aug 18, 3:29 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval	31 min
Aug 18, 3:35 PM EDT	Special Marine Warning	JAX		55 min
Aug 18, 3:36 PM EDT	Special Weather Statement	JAX	Duval	24 min
Aug 18, 3:37 PM EDT	Special Weather Statement	JAX	Baker	38 min
Aug 18, 3:46 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Saint Johns	29 min
Aug 18, 3:51 PM EDT	Special Weather Statement	JAX	Suwannee	39 min
Aug 18, 4:08 PM EDT	Special Weather Statement	JAX	Baker	37 min
Aug 18, 4:14 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Putnam, Saint Johns	25 min
Aug 18, 4:19 PM EDT	Areal Flood Advisory	JAX	Clay, Duval, Saint Johns	101 min
Aug 18, 4:27 PM EDT	Special Marine Warning	JAX		63 min
Aug 18, 4:32 PM EDT	Special Weather Statement	JAX	Gilchrist, Suwannee	43 min
Aug 18, 4:40 PM EDT	Special Weather Statement	JAX	Clay, Saint Johns	50 min
Aug 18, 4:47 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Saint Johns	13 min
Aug 18, 4:49 PM EDT	Special Weather Statement	JAX	Baker, Duval	41 min
Aug 18, 5:14 PM EDT	Special Weather Statement	JAX	Gilchrist	46 min
Aug 18, 5:16 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Clay, Duval, Union	29 min
Aug 18, 5:25 PM EDT	Special Weather Statement	JAX	Columbia, Union	35 min
Aug 18, 5:27 PM EDT	Special Marine Warning	JAX		63 min
Aug 18, 5:29 PM EDT	Special Weather Statement	JAX	Flagler	46 min
Aug 18, 5:31 PM EDT	Special Weather Statement	JAX	Putnam	44 min
Aug 18, 5:44 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Clay, Putnam, Union	31 min
Aug 18, 5:46 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	29 min
Aug 18, 5:50 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Gilchrist	109 min
Aug 18, 6:06 PM EDT	Special Weather Statement	JAX	Columbia, Hamilton, Suwannee	39 min
Aug 18, 6:08 PM EDT	Areal Flood Advisory	JAX	Baker, Bradford, Clay, Union	92 min
Aug 18, 6:13 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Marion, Putnam	47 min
Aug 18, 6:17 PM EDT	Special Weather Statement	JAX	Flagler	43 min
Aug 18, 6:19 PM EDT	Special Weather Statement	JAX	Union	41 min
Aug 18, 6:33 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay, Flagler, Putnam	117 min
Aug 18, 7:02 PM EDT	Special Weather Statement	JAX	Alachua, Bradford, Union	28 min
Aug 18, 7:29 PM EDT	Special Weather Statement	JAX	Flagler, Marion, Putnam	31 min
Aug 18, 7:32 PM EDT	Areal Flood Advisory	JAX	Alachua, Columbia, Union	88 min
Aug 18, 7:33 PM EDT	Areal Flood Advisory	JAX	Flagler	87 min
Aug 18, 7:35 PM EDT	Areal Flood Advisory	JAX	Marion, Putnam	85 min

Nearby

Severe Thunderstorm Warnings in Florida, 2026 Every severe thunderstorm warning in 2026

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.