Alert archive / Florida / Mesoscale Discussions in 2009
Mesoscale Discussion 377
The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2009, 7:28 PM EDT for 14 counties in Florida; 8 counties in Georgia. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 2, 2009, 7:28 PM EDT (23:28 UTC)
- Expired
- Apr 2, 2009, 9:00 PM EDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 22 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Lanier County, GA, Lowndes County, GA, Ware 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, 11.5 hours before the alert went out and 105 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
- 785 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 560 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 411 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
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 |
|---|---|---|---|---|
| Apr 2, 12:52 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 7 more | 113 min |
| Apr 2, 6:57 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more | 63 min |
| Apr 2, 7:29 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more | 8 hr |
| Apr 2, 8:31 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 6 more | 6 hr |
| Apr 2, 11:06 AM EDT | Mesoscale Discussion | SPC | Baker, Bay, Calhoun, Columbia, Dixie, Franklin and 16 more | 54 min |
| Apr 2, 1:17 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 13 more | 58 min |
| Apr 2, 2:33 PM EDT | Tornado Watch | SPC | Escambia, Okaloosa, Santa Rosa | 5 hr |
| Apr 2, 3:00 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bay, Bradford, Calhoun, Clay and 23 more | 7 hr |
| Apr 2, 4:42 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 5 more | 63 min |
| Apr 2, 4:12 AM EDT | Mesoscale Discussion | SPC | Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 70 more | 63 min |
| Apr 2, 6:25 PM EDT | Mesoscale Discussion | SPC | Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 20 more | 95 min |
| Apr 2, 7:02 PM EDT | Tornado Watch | SPC | Bartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 8 more | 7 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.