Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 1826
The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2012, 7:01 AM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2012, 7:01 AM CDT (12:01 UTC)
- Expired
- Aug 28, 2012, 9:30 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 24 counties
Baldwin County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gulf County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Saint Bernard Parish, LA, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS
The radar
The Eglin Afb radar (KEVX), 109 km from the middle of the area, began a volume at 12:04 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, 0.0 hours before the alert went out and 255 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
- 1339 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 482 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 161 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 |
|---|---|---|---|---|
| Aug 28, 9:46 AM CDT | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more | 9 hr |
| Aug 28, 12:37 PM CDT | Mesoscale Discussion | SPC | Baldwin, Escambia, Mobile, Washington | 83 min |
| Aug 28, 3:46 PM CDT | Mesoscale Discussion | SPC | Baldwin, Clarke, Escambia, Mobile, Monroe, Washington | 89 min |
| Aug 28, 5:48 PM CDT | Mesoscale Discussion | SPC | Baldwin, Conecuh, Covington, Escambia, Mobile, Monroe and 1 more | 87 min |
| Aug 28, 6:47 PM CDT | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more | 21 hr |
| Aug 28, 12:56 PM CDT | Tornado Watch | SPC | Covington, Forrest, Jefferson Davis, Jones, Lamar, Lawrence and 2 more | 6 hr |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale Discussions in Florida, 2012Mesoscale Discussions in Mississippi, 2012Every mesoscale discussion in 2012
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.