Alert archive / Florida / Mesoscale Discussions in 2013
Mesoscale Discussion 471
The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2013, 4:17 PM EDT for 23 counties in Florida; Charlton County, Echols County, Georgia. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 14, 2013, 4:17 PM EDT (20:17 UTC)
- Expired
- Apr 14, 2013, 5:45 PM EDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 25 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Lake County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Osceola County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Volusia County, FL, Charlton County, GA, Echols County, GA
The radar
The Jacksonville radar (KJAX), 105 km from the middle of the area, began a volume at 20:18 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
Tampa Bay, FL (KTBW), launched 12:00Z, 8.3 hours before the alert went out and 212 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
- 846 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 757 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
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 14, 10:24 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gulf, Liberty, Okaloosa and 3 more | 96 min |
| Apr 14, 10:57 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more | 8 hr |
| Apr 14, 1:03 PM EDT | Mesoscale Discussion | SPC | Glades, Hardee, Highlands, Lake, Marion, Okeechobee and 5 more | 87 min |
| Apr 14, 1:52 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 23 more | 9 hr |
| Apr 14, 2:05 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Gulf, Jefferson, Leon and 3 more | 85 min |
| Apr 14, 6:44 PM EDT | Mesoscale Discussion | SPC | Alachua, Dixie, Gilchrist, Lafayette, Lake, Marion and 4 more | 91 min |
Nearby
Mesoscale Discussions in Florida, 2013Mesoscale Discussions in Georgia, 2013Every mesoscale discussion in 2013
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.