Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 968
The Storm Prediction Center issued this mesoscale discussion at May 28, 2004, 7:31 PM CDT for 4 states. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2004, 7:31 PM CDT (00:31 UTC)
- Expired
- May 28, 2004, 9:00 PM CDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
All 79 counties
Cherokee County, IA, Crawford County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Yellow Medicine County, MN, Antelope County, NE, Boone County, NE, Boyd County, NE, Burt County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Platte County, NE, Rock County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clark County, SD, Clay County, SD, Davison County, SD, Deuel County, SD, Douglas County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, Lyman County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Sully County, SD, Tripp County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 91 km from the middle of the area, began a volume at 00:34 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
Omaha, NE (KOAX), launched 00:00Z, 0.5 hours before the alert went out and 179 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
- 821 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 1968 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 152 m²/s²
- 0-3 km storm-relative helicity
- 379 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
The text
As transmitted, in the capitals the NWS used until 2016.
110 ACUS11 KWNS 290032 SWOMCD SPC MCD 290031 IAZ000-MNZ000-NEZ000-SDZ000-290200- MESOSCALE DISCUSSION 0968 NWS STORM PREDICTION CENTER NORMAN OK 0731 PM CDT FRI MAY 28 2004 AREAS AFFECTED...SOUTH CENTRAL / SERN SD...NERN NEB...NWRN IA...SWRN MN CONCERNING...SEVERE THUNDERSTORM WATCH 319... VALID 290031Z - 290200Z SLOW MOVING SUPERCELL STORMS OVER SERN SD AND NERN NEB CONTINUE AS LOW LEVEL JET PROVIDES MOIST INFLOW. THESE STORMS WILL LIKELY EVOLVE OVER THE NEXT COUPLE HOURS INTO MORE OF A DAMAGING WIND THREAT AS OPPOSED TO A HAIL/ISOLATED TORNADO THREAT AS THEY BECOME OUTFLOW DOMINATE. FURTHER W...MODERATE INSTABILITY EXISTS OVER CENTRAL AND WRN SD WITH SHEAR PROFILES FAVORABLE FOR SUPERCELLS. HOWEVER...QUALITY OF BOUNDARY LAYER MOISTURE IS POOR ON RAPID CITY SOUNDING WHERE A MIXED LAYER PARCEL YIELDS SIGNIFICANT INHIBITION. ABERDEEN SOUNDING SHOWS HIGHER MIXING RATIOS AND COOLER MID LEVEL TEMPS. THUS...ELEVATED CONVECTION OVER SOUTH CENTRAL SD MAY STRENGTHEN AS IT MOVES INTO HIGHER DEWPOINT AXIS PROVIDED BY SLY LOW LEVEL JET. ..JEWELL.. 05/29/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD...OAX...ABR...GID...LBF...UNR... 41479491 41459940 44870058 44879585
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 9:03 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 24 more | 57 min |
| May 28, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 15 more | 5 hr |
| May 28, 11:41 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 16 more | 94 min |
| May 29, 12:42 PM CDT | Mesoscale Discussion | SPC | Adair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 45 more | 93 min |
| May 29, 2:05 PM CDT | Tornado Watch | SPC | Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 13 more | 8 hr |
| May 29, 3:05 PM CDT | Tornado Watch | SPC | Carroll, Crawford, Fremont, Harrison, Mills, Monona and 4 more | 7 hr |
| May 29, 4:35 PM CDT | Tornado Watch | SPC | Adair, Adams, Boone, Cass, Clarke, Dallas and 15 more | 5 hr |
| May 29, 5:01 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 13 more | 119 min |
| May 29, 3:25 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Douglas, Grant, Norman, Otter Tail and 2 more | 6 hr |
| May 29, 1:02 PM CDT | Mesoscale Discussion | SPC | Adams, Clay, Fillmore, Franklin, Gage, Hall and 10 more | 118 min |
| May 29, 1:54 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Frontier, Hayes, Hitchcock, Perkins and 1 more | 3 hr |
| May 29, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | Dundy, Furnas, Hitchcock, Red Willow | 6 hr |
| May 29, 5:16 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Buffalo, Clay, Custer, Dawson and 20 more | 59 min |
| May 29, 5:53 PM CDT | Mesoscale Discussion | SPC | Hayes, Hitchcock, Red Willow | 67 min |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion in 2004
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.