Alert archive / Georgia / Mesoscale Discussions in 2015
Mesoscale Discussion 457
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2015, 3:30 PM EDT for 11 counties in Florida; 13 counties in Georgia. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2015, 3:30 PM EDT (19:30 UTC)
- Expired
- Apr 25, 2015, 4:30 PM EDT
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 24 counties
Baker County, FL, Columbia County, FL, Duval County, FL, Gadsden County, FL, Hamilton County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Cook County, GA, Decatur County, GA, Echols County, GA, Grady County, GA, Lanier County, GA, Lowndes County, GA, Miller County, GA, Thomas 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, 7.5 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1018 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 316 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 |
|---|---|---|---|---|
| Apr 25, 5:12 AM EDT | Mesoscale Discussion | SPC | Escambia, Santa Rosa | 63 min |
| Apr 25, 6:00 AM EDT | Tornado Watch | SPC | Bay, Escambia, Holmes, Jackson, Okaloosa, Santa Rosa and 2 more | 7 hr |
| Apr 25, 8:41 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Holmes, Jackson, Jefferson and 8 more | 94 min |
| Apr 25, 9:08 AM EDT | Tornado Watch | SPC | Baker, Calhoun, Columbia, Duval, Franklin, Gadsden and 11 more | 7 hr |
| Apr 25, 12:20 PM EDT | Mesoscale Discussion | SPC | Columbia, Gadsden, Hamilton, Jefferson, Lafayette, Leon and 5 more | 85 min |
| Apr 25, 2:36 PM EDT | Severe Thunderstorm Watch | SPC | Escambia, Okaloosa, Santa Rosa | 4 hr |
| Apr 25, 2:50 PM EDT | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa | 85 min |
| Apr 25, 4:07 PM EDT | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Columbia, Franklin, Gadsden, Gulf and 13 more | 7 hr |
| Apr 25, 7:19 PM EDT | Mesoscale Discussion | SPC | Calhoun, Franklin, Gadsden, Gulf, Hamilton, Jackson and 6 more | 56 min |
| Apr 25, 3:10 PM EDT | Mesoscale Discussion | SPC | Carroll, Chattahoochee, Coweta, Haralson, Harris, Heard and 2 more | 95 min |
| Apr 25, 5:38 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Bibb, Bleckley, Butts, Chattahoochee, Clayton and 46 more | 5 hr |
| Apr 25, 6:07 PM EDT | Mesoscale Discussion | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more | 53 min |
| Apr 25, 6:28 PM EDT | Severe Thunderstorm Watch | SPC | Bryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more | 4 hr |
Nearby
Mesoscale Discussions in Georgia, 2015Mesoscale Discussions in Florida, 2015Every mesoscale discussion in 2015
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.