Alert archive / Florida / Mesoscale Discussions in 2011
Mesoscale Discussion 317
The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2011, 8:28 AM EDT for 32 counties in Florida; 9 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 30, 2011, 8:28 AM EDT (12:28 UTC)
- Expired
- Mar 30, 2011, 10:30 AM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Levy County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Volusia County, FL, Wakulla County, FL, Washington County, FL, Brooks County, GA, Charlton County, GA, Clinch County, GA, Decatur County, GA, Echols County, GA, Grady County, GA, Lowndes County, GA, Seminole County, GA, Thomas County, GA
The radar
The Tallahassee radar (KTLH), 55 km from the middle of the area, began a volume at 12:28 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.5 hours before the alert went out and 54 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
- 528 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 448 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 324 m²/s²
- 0-3 km storm-relative helicity
- 369 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.7
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 |
|---|---|---|---|---|
| Mar 30, 2:51 AM EDT | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa, Walton | 114 min |
| Mar 30, 5:07 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more | 6 hr |
| Mar 30, 11:10 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 27 more | 8 hr |
| Mar 30, 3:32 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more | 58 min |
| Mar 30, 4:41 PM EDT | Mesoscale Discussion | SPC | Brevard, Flagler, Orange, Osceola, Polk, Seminole and 1 more | 2 hr |
Nearby
Mesoscale Discussions in Florida, 2011Mesoscale Discussions in Georgia, 2011Every mesoscale discussion in 2011
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.