Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 216, NWS Jacksonville, FL

June 17, 2008Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 17, 2008, 6:52 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 38 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 17, 2008, 6:52 PM EDT (22:52 UTC)
Expired: Jun 17, 2008, 7:30 PM EDT
In force: 38 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 43 km from the middle of the area, began a volume at 22:55 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, 10.9 hours before the alert went out and 45 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: 1158 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -12 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 17, 1:54 PM EDT, 4 hours 58 minutes earlier.

Area forecast discussion, Jun 17, 1:54 PM EDT, 4 hours 58 minutes before

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Hazardous weather outlook, Jun 17, 4:45 AM EDT, 14 hours 7 minutes before

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In the hours before

Special weather statement, Jun 17, 5:45 PM EDT, 1 hour 7 minutes before

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Special weather statement, Jun 17, 5:47 PM EDT, 1 hour 5 minutes before

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Local storm report, Jun 17, 6:00 PM EDT, 52 minutes before

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Special weather statement, Jun 17, 6:11 PM EDT, 41 minutes before

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Local storm report, Jun 17, 6:26 PM EDT, 26 minutes before

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Special weather statement, Jun 17, 6:44 PM EDT, 8 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 17, 2:20 PM EDT	Special Marine Warning	JAX		55 min
Jun 17, 3:13 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Columbia, Gilchrist, Suwannee	47 min
Jun 17, 3:56 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Union	39 min
Jun 17, 5:33 PM EDT	Special Marine Warning	JAX		108 min
Jun 17, 5:50 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	40 min
Jun 17, 6:21 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Saint Johns	39 min
Jun 17, 6:56 PM EDT	Areal Flood Advisory	JAX	Duval, Saint Johns	48 min
Jun 17, 7:13 PM EDT	Special Marine Warning	JAX		100 min

Nearby

Severe Thunderstorm Warnings in Florida, 2008 Every severe thunderstorm warning in 2008

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.