Alert archive / South Dakota / Mesoscale Discussions in 2012
Mesoscale Discussion 712
The Storm Prediction Center issued this mesoscale discussion at May 5, 2012, 9:50 AM CDT for 16 counties in Minnesota; 19 counties in South Dakota. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- May 5, 2012, 9:50 AM CDT (14:50 UTC)
- Expired
- May 5, 2012, 10:45 AM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 35 counties
Brown County, MN, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Sibley County, MN, Watonwan County, MN, Yellow Medicine County, MN, Aurora County, SD, Beadle County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Davison County, SD, Douglas County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD
The radar
The Sioux Falls radar (KFSD), 92 km from the middle of the area, began a volume at 14:53 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
Aberdeen, SD (KABR), launched 12:00Z, 2.8 hours before the alert went out and 106 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 554 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 60 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
992 ACUS11 KWNS 051450 SWOMCD SPC MCD 051450 MNZ000-IAZ000-SDZ000-051545- MESOSCALE DISCUSSION 0712 NWS STORM PREDICTION CENTER NORMAN OK 0950 AM CDT SAT MAY 05 2012 AREAS AFFECTED...CNTRL/SERN SD...SWRN MN...NWRN IA CONCERNING...SEVERE THUNDERSTORM WATCH 247... VALID 051450Z - 051545Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 247 CONTINUES. SUMMARY...HAIL REMAINS LIKELY WITH MCS ACTIVITY AS IT SPREADS ACROSS CNTRL/SERN SD INTO THE UPPER MS VALLEY. NEW SEVERE THUNDERSTORM WATCH WILL LIKELY BE REQUIRED INTO PORTIONS OF SRN MN IN THE NEXT HOUR. DISCUSSION...TWO MCS CLUSTERS HAVE EVOLVED ACROSS SD THIS MORNING. THE LEAD MCS IS SPREADING EWD ACROSS CNTRL PORTIONS OF WW247 AND EXHIBITS SEVERAL STOUT UPDRAFTS THAT ARE LIKELY PRODUCING VERY LARGE HAIL OVER MCCOOK AND DAVISON COUNTIES. THE SECOND MCS WILL SOON SPREAD INTO THE WRN PARTS OF THE WATCH. THIS ACTIVITY HAS EVOLVED WITHIN A ZONE OF FAVORABLE LOW LEVEL WARM ADVECTION AND THE LIKELIHOOD OF MCS MAINTENANCE IS HIGH GIVEN THAT THE LLJ SHOULD STRENGTHEN ACROSS SERN SD INTO THE EARLY AFTERNOON HOURS. WITH TIME SEVERE ELEVATED STORMS SHOULD PROGRESS INTO SWRN MN...PERHAPS DEVELOPING INTO THE EXTREME NWRN PARTS OF IA. ..DARROW.. 05/05/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD...ABR...UNR... LAT...LON 44709978 44739402 43499427 43329971 44709978
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 6:49 AM CDT | Severe Thunderstorm Watch | SPC | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more | 7 hr |
| May 5, 11:38 AM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Brown, Carver, Dakota, Dodge, Faribault and 20 more | 6 hr |
| May 5, 2:58 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dakota, Dodge, Faribault and 20 more | 62 min |
| May 5, 6:46 PM CDT | Severe Thunderstorm Watch | SPC | Lincoln, Pipestone, Rock | 6 hr |
| May 4, 9:54 PM CDT | Mesoscale Discussion | SPC | Union | 96 min |
| May 5, 3:06 AM CDT | Mesoscale Discussion | SPC | Custer, Fall River, Haakon, Hughes, Hyde, Jackson and 9 more | 84 min |
| May 5, 3:19 AM CDT | Severe Thunderstorm Watch | SPC | Bennett, Buffalo, Butte, Custer, Dewey, Fall River and 17 more | 9 hr |
| May 5, 2:09 PM CDT | Mesoscale Discussion | SPC | Union | 96 min |
| May 5, 3:52 PM CDT | Mesoscale Discussion | SPC | Clay, Lincoln, Union, Yankton | 83 min |
| May 5, 5:31 PM CDT | Tornado Watch | SPC | Bon Homme, Clay, Union, Yankton | 5 hr |
| May 5, 6:21 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bon Homme, Brule, Charles Mix, Davison and 15 more | 84 min |
Nearby
Mesoscale Discussions in South Dakota, 2012Mesoscale Discussions in Minnesota, 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.