Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 2235

December 16, 200710 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Dec 16, 2007, 5:10 AM EST for 10 counties in Florida. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Dec 16, 2007, 5:10 AM EST (10:10 UTC)
Expired: Dec 16, 2007, 6:15 AM EST
In force: 65 min
Issued by: the Storm Prediction Center

Counties Flagler County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Marion County, FL, Orange County, FL, Pasco County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 127 km from the middle of the area, began a volume at 10:12 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 740Dec 16, 6:15 AM EST

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 10.2 hours before the alert went out and 127 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: 660 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 839 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 15, 9:19 PM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 14 more	116 min
Dec 15, 9:42 PM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 24 more	8 hr
Dec 16, 12:29 AM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 24 more	2 hr
Dec 16, 3:16 AM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more	119 min
Dec 16, 6:15 AM EST	Tornado Watch	SPC	Lake, Orange, Seminole, Volusia	107 min
Dec 16, 7:32 AM EST	Mesoscale Discussion	SPC	Orange, Seminole, Volusia	58 min

Nearby

Mesoscale Discussions in Florida, 2007 Every mesoscale discussion in 2007

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.