Alert archive / Florida / Mesoscale Discussions in 2017
Mesoscale Discussion 457
The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2017, 3:12 AM EDT for 31 counties in Florida; 18 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 6, 2017, 3:12 AM EDT (07:12 UTC)
- Expired
- Apr 6, 2017, 5:15 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 49 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Hillsborough County, FL, Jefferson County, FL, Lafayette County, FL, Lake County, FL, Levy County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Pasco County, FL, Pinellas County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Lanier County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
The radar
The Jacksonville radar (KJAX), 121 km from the middle of the area, began a volume at 07:15 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 00:00Z, 7.2 hours before the alert went out and 123 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
- 1177 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 1408 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.8
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 11:15 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 8 more | 2 hr |
| Apr 6, 12:15 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 22 more | 6 hr |
| Apr 6, 6:10 AM EDT | Mesoscale Discussion | SPC | Hardee, Hillsborough, Lake, Manatee, Orange, Osceola and 4 more | 2 hr |
| Apr 5, 9:58 PM EDT | Tornado Watch | SPC | Bibb, Butts, Chattahoochee, Clayton, Coweta, Crawford and 27 more | 3 hr |
| Apr 5, 11:34 PM EDT | Mesoscale Discussion | SPC | Elbert, Lincoln, Wilkes | 56 min |
| Apr 5, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | Baldwin, Bleckley, Burke, Clarke, Columbia, Elbert and 24 more | 6 hr |
| Apr 6, 2:54 AM EDT | Mesoscale Discussion | SPC | Burke, Columbia, Dodge, Emanuel, Jefferson, Jenkins and 4 more | 96 min |
Nearby
Mesoscale Discussions in Florida, 2017Mesoscale Discussions in Georgia, 2017Every mesoscale discussion in 2017
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; radar from the NEXRAD Level II archive.