Alert archive / Florida / Mesoscale Discussions in 2007
Mesoscale Discussion 1992
The Storm Prediction Center issued this mesoscale discussion at Sep 20, 2007, 10:56 PM EDT for 19 counties in Florida; Echols County, Lowndes County, Georgia. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Sep 20, 2007, 10:56 PM EDT (02:56 UTC)
- Expired
- Sep 21, 2007, 12:30 AM EDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 21 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Putnam County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Echols County, GA, Lowndes County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.9 hours before the alert went out and 140 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.
- Mixed-layer CAPE
- 547 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 577 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 11:19 PM EDT | Tornado Watch | SPC | Alachua, Bradford, Columbia, Dixie, Gilchrist, Hamilton and 12 more | 7 hr |
| Sep 21, 2:35 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Columbia, Dixie, Franklin and 13 more | 115 min |
| Sep 21, 11:45 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gulf, Liberty, Wakulla and 1 more | 60 min |
| Sep 21, 5:37 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 9 more | 53 min |
| Sep 21, 5:58 PM EDT | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 10 more | 7 hr |
Nearby
Mesoscale Discussions in Florida, 2007Mesoscale Discussions in Georgia, 2007Every 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.