Alert archive / Florida / Mesoscale Discussions in 2008

Mesoscale Discussion 227

February 13, 200810 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 13, 2008, 8:19 AM EST for 10 counties in Florida. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Feb 13, 2008, 8:19 AM EST (13:19 UTC)
Expired: Feb 13, 2008, 9:15 AM EST
In force: 56 min
Issued by: the Storm Prediction Center

Counties Broward County, FL, Charlotte County, FL, Collier County, FL, Glades County, FL, Hendry County, FL, Lee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL

The watches that followed

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

Severe Thunderstorm Watch 56Feb 13, 11:45 AM EST

The nearest sounding before it

Key West, FL (KEYW), launched 12:00Z, 1.3 hours before the alert went out and 169 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: 1835 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.7

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
Feb 12, 7:41 PM EST	Mesoscale Discussion	SPC	Alachua, Bradford, Brevard, Broward, Charlotte, Citrus and 34 more	2 hr
Feb 12, 8:11 PM EST	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 6 more	64 min
Feb 12, 8:30 PM EST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more	4 hr
Feb 12, 9:39 PM EST	Mesoscale Discussion	SPC	Alachua, Broward, Charlotte, Citrus, Collier, DeSoto and 25 more	96 min
Feb 12, 10:20 PM EST	Tornado Watch	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 30 more	9 hr
Feb 12, 11:25 PM EST	Mesoscale Discussion	SPC	Gadsden, Jefferson, Leon, Madison, Taylor, Wakulla	95 min
Feb 13, 3:12 AM EST	Mesoscale Discussion	SPC	Alachua, Brevard, Broward, Charlotte, Citrus, Collier and 30 more	93 min
Feb 13, 10:52 AM EST	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Martin, Miami-Dade and 4 more	53 min
Feb 13, 11:44 AM EST	Severe Thunderstorm Watch	SPC	Broward, Collier, Miami-Dade, Monroe, Palm Beach	4 hr

Nearby

Mesoscale Discussions in Florida, 2008 Every mesoscale discussion 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.