Alert archive / Tennessee / Mesoscale Discussions in 2011
Mesoscale Discussion 1851
The Storm Prediction Center issued this mesoscale discussion at Aug 4, 2011, 10:21 AM CDT for 4 states. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2011, 10:21 AM CDT (15:21 UTC)
- Expired
- Aug 4, 2011, 11:45 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 28 counties
Alexander County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Marshall County, KY, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Weakley County, TN
The radar
The Paducah radar (KPAH), 105 km from the middle of the area, began a volume at 15:23 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
Little Rock, AR (KLZK), launched 12:00Z, 3.4 hours before the alert went out and 166 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
- 3023 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 1991 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 9 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 4, 6:04 AM CDT | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Monroe, Perry, Pulaski and 3 more | 86 min |
| Aug 4, 8:06 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Pulaski | 4 hr |
| Aug 4, 2:10 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Bates, Benton, Camden, Cedar and 35 more | 80 min |
| Aug 4, 3:28 AM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cedar, Christian and 32 more | 7 hr |
| Aug 4, 1:25 AM CDT | Mesoscale Discussion | SPC | Chester, Crockett, Decatur, Fayette, Giles, Hardeman and 7 more | 95 min |
Nearby
Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Missouri, 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.