Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 155, NWS Jacksonville, FL

June 28, 2020Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 28, 2020, 5:15 PM EDT for Marion 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: Jun 28, 2020, 5:15 PM EDT (21:15 UTC)
Expired: Jun 28, 2020, 6:00 PM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 21:17 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.3 hours before the alert went out and 173 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: 143 J/kg
Mixed-layer CIN: -215 J/kg
Mixed-layer LCL: 1720 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 44 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 Jun 28, 2:54 PM EDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jun 28, 2:54 PM EDT, 2 hours 21 minutes before

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In the hours before

Special weather statement, Jun 28, 4:33 PM EDT, 42 minutes before

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Special weather statement, Jun 28, 4:36 PM EDT, 39 minutes before

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Special weather statement, Jun 28, 4:56 PM EDT, 19 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
Jun 28, 4:33 PM EDT	Special Weather Statement	JAX	Marion	27 min
Jun 28, 4:36 PM EDT	Special Weather Statement	JAX	Saint Johns	39 min
Jun 28, 4:56 PM EDT	Special Weather Statement	JAX	Marion	49 min
Jun 28, 5:35 PM EDT	Severe Thunderstorm Warning	JAX	Putnam	40 min
Jun 28, 5:40 PM EDT	Special Weather Statement	JAX	Marion	50 min
Jun 28, 5:53 PM EDT	Special Weather Statement	JAX	Flagler	52 min
Jun 28, 6:04 PM EDT	Special Weather Statement	JAX	Marion	26 min
Jun 28, 6:20 PM EDT	Special Weather Statement	JAX	Putnam	40 min
Jun 28, 6:45 PM EDT	Special Weather Statement	JAX	Flagler	30 min
Jun 28, 7:35 PM EDT	Special Weather Statement	JAX	Saint Johns	40 min
Jun 27, 8:39 PM EDT	Special Weather Statement	JAX	Appling, Jeff Davis	51 min
Jun 27, 9:27 PM EDT	Special Weather Statement	JAX	Wayne	63 min
Jun 27, 9:31 PM EDT	Special Weather Statement	JAX	Jeff Davis	44 min
Jun 27, 9:45 PM EDT	Special Weather Statement	JAX	Jeff Davis	45 min
Jun 27, 10:05 PM EDT	Severe Thunderstorm Warning	JAX	Coffee, Jeff Davis	25 min
Jun 27, 10:33 PM EDT	Special Weather Statement	JAX	Jeff Davis	27 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.