Alert archive / Florida / Special Weather Statements in 2011

Special Weather Statement, NWS Tampa Bay, FL

April 19, 2011Polk County, Florida

NWS Tampa Bay, FL issued this special weather statement at Apr 19, 2011, 8:32 PM EDT for Polk County, Florida. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 19, 2011, 8:32 PM EDT (00:32 UTC)
Expired: Apr 19, 2011, 9:15 PM EDT
In force: 43 min
Issued by: NWS Tampa Bay, FL

County Polk County, FL

The radar

The Tampa radar (KTBW), 60 km from the middle of the area, began a volume at 00:36 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

Tampa Bay, FL (KTBW), launched 00:00Z, 0.5 hours before the alert went out and 60 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: 2183 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1010 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 19, 1:28 PM EDT, 7 hours 4 minutes earlier.

Area forecast discussion, Apr 19, 1:28 PM EDT, 7 hours 4 minutes before

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Hazardous weather outlook, Apr 19, 4:37 AM EDT, 15 hours 55 minutes before

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In the hours before

Special weather statement, Apr 19, 5:48 PM EDT, 2 hours 44 minutes before

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Local storm report, Apr 19, 6:18 PM EDT, 2 hours 14 minutes before

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Special weather statement, Apr 19, 7:05 PM EDT, 1 hour 27 minutes before

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Special weather statement, Apr 19, 8:32 PM EDT, 0 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
Apr 20, 2:51 PM EDT	Special Weather Statement	TBW	Levy	39 min
Apr 20, 3:16 PM EDT	Special Weather Statement	TBW	Levy	44 min
Apr 20, 3:52 PM EDT	Special Weather Statement	TBW	Levy	38 min
Apr 20, 3:56 PM EDT	Areal Flood Advisory	TBW	Levy	94 min
Apr 20, 4:16 PM EDT	Severe Thunderstorm Warning	TBW	Levy	29 min

Nearby

Special Weather Statements in Florida, 2011 Every special weather statement in 2011

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.