Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 3, NWS Tampa Bay, FL

March 29, 2009Levy County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 29, 2009, 2:06 AM EDT for Levy 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: Mar 29, 2009, 2:06 AM EDT (06:06 UTC)
Expired: Mar 29, 2009, 2:45 AM EDT
In force: 39 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon

County Levy County, FL

The radar

The Jacksonville radar (KJAX), 170 km from the middle of the area, began a volume at 06:09 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 00:00Z, 6.1 hours before the alert went out and 171 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: 264 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1552 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 28, 8:06 PM EDT, 6 hours earlier.

Area forecast discussion, Mar 28, 8:06 PM EDT, 6 hours before

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Hazardous weather outlook, Mar 28, 5:14 AM EDT, 20 hours 52 minutes before

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In the hours before

Special weather statement, Mar 28, 8:45 PM EDT, 5 hours 21 minutes before

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Special weather statement, Mar 29, 1:42 AM EDT, 24 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 12:16 AM EDT	Special Marine Warning	TBW		89 min
Mar 29, 1:43 AM EDT	Special Marine Warning	TBW		92 min
Mar 29, 4:08 AM EDT	Special Marine Warning	TBW		97 min
Mar 29, 4:55 AM EDT	Fire Weather Watch	TBW	DeSoto, Hardee, Highlands, Pinellas, Polk, Sumter	23 hr
Mar 29, 6:02 AM EDT	Special Marine Warning	TBW		88 min
Mar 29, 9:31 AM EDT	Severe Thunderstorm Warning	TBW	Hillsborough, Pasco, Polk	29 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009 Every severe thunderstorm warning in 2009

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.