Alert archive / South Dakota / Mesoscale Discussions in 2004
Mesoscale Discussion 607
The Storm Prediction Center issued this mesoscale discussion at May 8, 2004, 9:17 PM CDT for Boyd County, Nebraska; 21 counties in North Dakota; 38 counties in South Dakota. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- May 8, 2004, 9:17 PM CDT (02:17 UTC)
- Expired
- May 8, 2004, 10:45 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 60 counties
Barnes County, ND, Benson County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Rolette County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Wells County, ND, Boyd County, NE, Aurora County, SD, Beadle County, SD, Bennett County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Clark County, SD, Davison County, SD, Day County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Gregory County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Mellette County, SD, Miner County, SD, Potter County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 118 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 nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.3 hours before the alert went out and 170 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
- 196 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 2876 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 090217 SWOMCD SPC MCD 090217 NDZ000-SDZ000-NEZ000-090345- MESOSCALE DISCUSSION 0607 NWS STORM PREDICTION CENTER NORMAN OK 0917 PM CDT SAT MAY 08 2004 AREAS AFFECTED...ERN AND CENTRAL ND/SD CONCERNING...SEVERE THUNDERSTORM WATCH 166...168... VALID 090217Z - 090345Z DAMAGING WIND THREAT MAY PERSIST FOR ANOTHER HOUR BEYOND WW 166 EXPIRATION TIME OVER CENTRAL/ERN ND. HOWEVER...A CONTINUED WEAKENING TREND IS ANTICIPATED. THEREFORE A NEW WW IS NOT EXPECTED. FARTHER SOUTH...SEVERE THREAT WILL PERSIST FOR ANOTHER FEW HOURS OVER CENTRAL SD...WITH THE GREATEST THREAT OVER SCENTRAL SD WHERE A CLUSTER SEVERE STORMS WILL MOVE SEWD AROUND 30 KTS. THE SEVERE THREAT MAY MOVE OUT OF WW 168 BY 09/04Z...THEREFORE A NEW WW MAY BE NEEDED FOR SERN SD. 00Z SOUNDING FROM ABR INDICATES SUBSTANTIALLY LESS INSTABILITY THAN AREAS FARTHER WEST...WITH MUCAPES AROUND 400 J/KG. ALTHOUGH DAMAGING WINDS WILL REMAIN POSSIBLE...THE CONVECTIVE LINE OVER CENTRAL ND IS ANTICIPATED TO CONTINUE TO WEAKEN IN THE NEXT HOUR AND WW 166 WILL BE ALLOWED TO EXPIRE AT 09/02Z. FARTHER SOUTH...INSTABILITY AXIS OF 2000-3000 J/KG EXTENDS FROM NWRN IA INTO FAR NRN NEB. INCREASING SLY LOW LEVEL JET OVER THE NEXT FEW HOURS MAY AID IN SUFFICIENT INFLOW/CONVERGENCE TO SUPPORT A CLUSTER OF SEVERE STORMS OVER SCENTRAL SD SOUTHEAST OF WW 168. CURRENT EXTRAPOLATION OF THIS CLUSTER MOVEMENT...300/30 KTS WOULD TAKE THE SEVERE THREAT OUT OF WW 168 BY 09/04Z. AREAS SE OF WW 168 WILL BE MONITORED FOR ANOTHER POSSIBLE WW IN THE NEXT 1-2 HOURS. ..CROSBIE.. 05/09/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FGF...FSD...OAX...ABR...BIS...LBF...UNR... 43340200 44000162 45879999 46300054 46790039 47890015 48969991 48509785 44999727 43629726 42849833 42990167
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 7:54 PM CDT | Mesoscale Discussion | SPC | Butler, Cass, Clay, Dodge, Douglas, Fillmore and 20 more | 2 hr |
| May 8, 8:25 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Burt, Butler, Cass, Clay and 29 more | 6 hr |
| May 8, 10:44 PM CDT | Mesoscale Discussion | SPC | Cass, Douglas, Fillmore, Gage, Jefferson, Johnson and 12 more | 2 hr |
| May 9, 1:22 AM CDT | Mesoscale Discussion | SPC | Adams, Cass, Clay, Fillmore, Franklin, Gage and 14 more | 23 min |
| May 9, 2:42 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Brown, Chase, Cherry, Custer and 19 more | 3 hr |
| May 9, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Blaine, Boone, Boyd, Buffalo and 29 more | 6 hr |
| May 9, 5:38 PM CDT | Mesoscale Discussion | SPC | Cedar | 2 hr |
| May 9, 6:12 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Blaine, Boone, Buffalo, Butler and 37 more | 2 hr |
| May 8, 7:16 PM CDT | Mesoscale Discussion | SPC | Benson, Bottineau, Burke, Burleigh, Dickey, Emmons and 19 more | 119 min |
| May 9, 2:00 PM CDT | Mesoscale Discussion | SPC | Sargent | 3 hr |
| May 8, 7:15 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 20 more | 6 hr |
| May 9, 2:30 PM CDT | Severe Thunderstorm Watch | SPC | Bon Homme, Brookings, Deuel, Douglas, Hanson, Hutchinson and 8 more | 6 hr |
Nearby
Mesoscale Discussions in South Dakota, 2004Mesoscale Discussions in North Dakota, 2004Mesoscale Discussions in Nebraska, 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.