Alert archive / Florida / Mesoscale Discussions in 2009
Mesoscale Discussion 137
The Storm Prediction Center issued this mesoscale discussion at Feb 19, 2009, 4:19 AM EST for 24 counties in Florida; 21 counties in Georgia. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Feb 19, 2009, 4:19 AM EST (09:19 UTC)
- Expired
- Feb 19, 2009, 5:15 AM EST
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 45 counties
Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Cook County, GA, Echols County, GA, Glynn County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Thomas County, GA, Ware County, GA, Wayne County, GA
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 9.3 hours before the alert went out and 102 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
- 177 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 371 m²/s²
- 0-3 km storm-relative helicity
- 426 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.3
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 |
|---|---|---|---|---|
| Feb 18, 8:42 PM EST | Severe Thunderstorm Watch | SPC | Escambia, Okaloosa, Santa Rosa | 5 hr |
| Feb 18, 10:14 PM EST | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more | 6 hr |
| Feb 18, 11:55 PM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Hamilton, Holmes, Jackson and 8 more | 95 min |
| Feb 19, 1:41 AM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Clay and 17 more | 49 min |
| Feb 19, 1:58 AM EST | Tornado Watch | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Clay and 23 more | 7 hr |
| Feb 19, 7:06 AM EST | Mesoscale Discussion | SPC | Alachua, Bradford, Clay, Dixie, Gilchrist, Putnam and 1 more | 54 min |
| Feb 18, 8:02 PM EST | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more | 7 hr |
| Feb 18, 8:14 PM EST | Mesoscale Discussion | SPC | Carroll, Coweta, Douglas, Fayette, Haralson, Harris and 6 more | 61 min |
| Feb 18, 8:58 PM EST | Mesoscale Discussion | SPC | Baldwin, Bibb, Bleckley, Burke, Butts, Chattahoochee and 51 more | 92 min |
| Feb 19, 12:38 AM EST | Severe Thunderstorm Watch | SPC | Appling, Atkinson, Bacon, Brantley, Camden, Charlton and 8 more | 81 min |
| Feb 19, 2:20 AM EST | Mesoscale Discussion | SPC | Bryan, Bulloch, Candler, Chatham, Crisp, Dodge and 13 more | 25 min |
| Feb 19, 2:44 AM EST | Tornado Watch | SPC | Bryan, Chatham, Evans, Liberty, Long, McIntosh and 1 more | 3 hr |
Nearby
Mesoscale Discussions in Florida, 2009Mesoscale Discussions in Georgia, 2009Every mesoscale discussion 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.