Alert archive / South Dakota / Mesoscale Discussions in 2016
Mesoscale Discussion 1639
The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2016, 9:16 PM CDT for Wilkin County, Minnesota; 6 counties in North Dakota; 30 counties in South Dakota. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2016, 9:16 PM CDT (02:16 UTC)
- Expired
- Sep 4, 2016, 10:15 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 37 counties
Wilkin County, MN, Dickey County, ND, LaMoure County, ND, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Aurora County, SD, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Mellette County, SD, Miner County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD
The radar
The Aberdeen radar (KABR), 108 km from the middle of the area, began a volume at 02:20 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 00:00Z, 2.3 hours before the alert went out and 66 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
- 359 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 1204 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted.
368 ACUS11 KWNS 050216 SWOMCD SPC MCD 050216 MNZ000-SDZ000-NDZ000-050315- MESOSCALE DISCUSSION 1639 NWS STORM PREDICTION CENTER NORMAN OK 0916 PM CDT SUN SEP 04 2016 AREAS AFFECTED...EASTERN SD...SERN ND CONCERNING...SEVERE THUNDERSTORM WATCH 466... VALID 050216Z - 050315Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 466 CONTINUES. SUMMARY...SEVERE THREAT IS INCREASING ACROSS THE SOUTHERN HALF OF WW466. DISCUSSION...HIGH PLAINS CONVECTION THAT DEVELOPED OVER SWRN SD/NEB PANHANDLE HAS MATURED INTO A WELL-DEFINED MCS OVER SCNTRL SD. LATEST RADAR DATA SUGGESTS AN MCV HAS FORMED SW OF PIR OVER JONES COUNTY. A BOWING SEGMENT IS SURGING NEWD IN EXCESS OF 40KT IN ADVANCE OF THIS FEATURE AND IS LIKELY GENERATING DAMAGING WINDS ALONG THE LEADING EDGE OF THE BOW...ESPECIALLY LYMAN COUNTY SD. THIS COMPLEX SHOULD SPREAD ACROSS MUCH OF THE SRN HALF OF WW466 OVER THE NEXT FEW HOURS. CONVECTION WILL CONTINUE TO DEVELOP NEAR THE FRONTAL ZONE EXTENDING ACROSS NCNTRL SD INTO ERN ND. HOWEVER...MUCH OF THIS ACTIVITY HAS STRUGGLED TO ATTAIN SEVERE LEVELS. FOR THIS REASON...MARGINALLY SEVERE HAIL MAY BE THE GREATEST RISK WITH THIS ELEVATED OR NEAR-SFC BASED CONVECTION. ..DARROW.. 09/05/2016 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FGF...FSD...ABR...BIS...UNR... LAT...LON 43350115 46569941 46569606 43359795 43350115
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 1:10 AM CDT | Mesoscale Discussion | SPC | Cottonwood, Murray, Nobles | 2 hr |
| Sep 5, 3:08 PM CDT | Mesoscale Discussion | SPC | Chippewa, Kandiyohi, Lac qui Parle, Lincoln, Lyon, McLeod and 8 more | 2 hr |
| Sep 4, 8:57 PM CDT | Mesoscale Discussion | SPC | Bennett, Jackson, Mellette, Todd | 93 min |
| Sep 4, 10:40 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bon Homme, Charles Mix, Clay, Davison and 14 more | 4 hr |
| Sep 5, 6:09 PM CDT | Mesoscale Discussion | SPC | Custer, Fall River, Lawrence | 3 hr |
Nearby
Mesoscale Discussions in South Dakota, 2016Mesoscale Discussions in North Dakota, 2016Mesoscale Discussions in Minnesota, 2016Every mesoscale discussion in 2016
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.