Alert archive / Florida / Mesoscale Discussions in 2009
Mesoscale Discussion 796
The Storm Prediction Center issued this mesoscale discussion at May 11, 2009, 3:46 PM EDT for 19 counties in Florida; 19 counties in Georgia; Beaufort County, Hampton County, Jasper County, South Carolina. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- May 11, 2009, 3:46 PM EDT (19:46 UTC)
- Expired
- May 11, 2009, 4:45 PM EDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 41 counties
Brevard County, FL, Clay County, FL, Duval County, FL, Flagler County, FL, Glades County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Martin County, FL, Nassau County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Putnam County, FL, Saint Johns County, FL, Saint Lucie County, FL, Seminole County, FL, Volusia County, FL, Appling County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Wayne County, GA, Beaufort County, SC, Hampton County, SC, Jasper County, SC
The radar
The Melbourne radar (KMLB), 128 km from the middle of the area, began a volume at 19:48 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 12:00Z, 7.8 hours before the alert went out and 156 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
- 940 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1331 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 45 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 |
|---|---|---|---|---|
| May 11, 9:23 AM EDT | Mesoscale Discussion | SPC | Berkeley, Charleston, Clarendon, Colleton, Dorchester, Florence and 5 more | 67 min |
Nearby
Mesoscale Discussions in Florida, 2009Mesoscale Discussions in Georgia, 2009Mesoscale Discussions in South Carolina, 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; radar from the NEXRAD Level II archive.