Alert archive / South Dakota / Mesoscale Discussions in 2009
Mesoscale Discussion 808
The Storm Prediction Center issued this mesoscale discussion at May 12, 2009, 8:42 PM CDT for 5 states. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 12, 2009, 8:42 PM CDT (01:42 UTC)
- Expired
- May 12, 2009, 10:15 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 81 counties
Lyon County, IA, Big Stone County, MN, Clay County, MN, Grant County, MN, Kittson County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Marshall County, MN, Murray County, MN, Norman County, MN, Pennington County, MN, Pipestone County, MN, Polk County, MN, Red Lake County, MN, Rock County, MN, Stevens County, MN, Traverse County, MN, Wilkin County, MN, Yellow Medicine County, MN, Barnes County, ND, Benson County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, LaMoure County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND, Boyd County, NE, Brown County, NE, Cedar County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Rock County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Marshall County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD
The radar
The Aberdeen radar (KABR), 69 km from the middle of the area, began a volume at 01:43 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 1.7 hours before the alert went out and 234 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
- 281 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1743 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.5
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 13, 1:52 PM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Lee, Monroe, Van Buren, Wayne | 23 min |
| May 13, 2:39 PM CDT | Tornado Watch | SPC | Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 15 more | 7 hr |
| May 13, 5:47 PM CDT | Mesoscale Discussion | SPC | Appanoose, Cedar, Clinton, Davis, Des Moines, Henry and 16 more | 88 min |
| May 12, 7:08 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Custer and 13 more | 7 hr |
| May 13, 12:46 AM CDT | Mesoscale Discussion | SPC | Antelope, Blaine, Boone, Buffalo, Cedar, Custer and 20 more | 29 min |
Nearby
Mesoscale Discussions in South Dakota, 2009Mesoscale Discussions in North Dakota, 2009Mesoscale Discussions in Minnesota, 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.