Alert archive / Georgia / Mesoscale Discussions in 2009
Mesoscale Discussion 177
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2009, 4:27 PM EST for 6 counties in Florida; 22 counties in Georgia. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2009, 4:27 PM EST (21:27 UTC)
- Expired
- Feb 28, 2009, 6:00 PM EST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 28 counties
Gadsden County, FL, Hamilton County, FL, Jefferson County, FL, Leon County, FL, Madison County, FL, Nassau County, FL, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Cook County, GA, Decatur County, GA, Echols County, GA, Glynn County, GA, Grady 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 9.5 hours before the alert went out and 138 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1136 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 36 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 |
|---|---|---|---|---|
| Feb 28, 10:49 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 8 more | 86 min |
| Feb 28, 11:39 AM EST | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more | 7 hr |
| Feb 28, 1:50 PM EST | Mesoscale Discussion | SPC | Calhoun, Gadsden, Jackson, Leon, Washington | 85 min |
| Feb 28, 6:43 PM EST | Tornado Watch | SPC | Baker, Bay, Calhoun, Columbia, Dixie, Duval and 18 more | 8 hr |
| Feb 27, 7:38 PM EST | Mesoscale Discussion | SPC | Chattahoochee, Clay, Muscogee, Quitman, Stewart | 97 min |
| Feb 28, 8:25 AM EST | Tornado Watch | SPC | Baldwin, Bibb, Bleckley, Butts, Chattahoochee, Crawford and 43 more | 3 hr |
Nearby
Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in Florida, 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.