Alert archive / Florida / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 34, NWS Jacksonville, FL

April 30, 2014Marion County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Apr 30, 2014, 3:36 PM EDT for Marion County, Florida. It was in force for 39 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, 2014, 3:36 PM EDT (19:36 UTC)
Expired: Apr 30, 2014, 4:15 PM EDT
In force: 39 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Marion County, FL

The radar

The Jacksonville radar (KJAX), 146 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 148 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: 1400 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.2

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, 3:10 PM EDT, 26 minutes earlier.

Area forecast discussion, Apr 30, 3:10 PM EDT, 26 minutes before

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Hazardous weather outlook, Apr 30, 3:00 AM EDT, 12 hours 36 minutes before

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In the hours before

Local storm report, Apr 30, 2:57 PM EDT, 39 minutes before

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Local storm report, Apr 30, 3:04 PM EDT, 32 minutes before

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Local storm report, Apr 30, 3:07 PM EDT, 29 minutes before

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Special weather statement, Apr 30, 3:22 PM EDT, 14 minutes before

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Local storm report, Apr 30, 3:32 PM EDT, 4 minutes before

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Local storm report, Apr 30, 3:35 PM EDT, 1 minute 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, 1:06 PM EDT	Special Weather Statement	JAX	Duval	39 min
Apr 30, 1:33 PM EDT	Special Weather Statement	JAX	Alachua	42 min
Apr 30, 1:36 PM EDT	Special Weather Statement	JAX	Clay	39 min
Apr 30, 1:55 PM EDT	Special Weather Statement	JAX	Putnam	50 min
Apr 30, 2:16 PM EDT	Special Weather Statement	JAX	Saint Johns	44 min
Apr 30, 2:34 PM EDT	Special Weather Statement	JAX	Putnam	41 min
Apr 30, 2:35 PM EDT	Special Weather Statement	JAX	Marion	40 min
Apr 30, 2:49 PM EDT	Special Weather Statement	JAX	Marion	41 min
Apr 30, 2:55 PM EDT	Severe Thunderstorm Warning	JAX	Marion	50 min
Apr 30, 2:59 PM EDT	Special Marine Warning	JAX		91 min
Apr 30, 3:22 PM EDT	Special Weather Statement	JAX	Marion	53 min
Apr 30, 3:40 PM EDT	Areal Flood Warning	JAX	Marion	2 hr
Apr 30, 3:50 PM EDT	Special Weather Statement	JAX	Flagler	40 min
Apr 30, 4:09 PM EDT	Special Marine Warning	JAX		111 min
Apr 30, 4:24 PM EDT	Special Weather Statement	JAX	Flagler	51 min
Apr 30, 5:59 PM EDT	Special Marine Warning	JAX		91 min

Nearby

Severe Thunderstorm Warnings in Florida, 2014 Every severe thunderstorm warning in 2014

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.