Alert archive / Iowa / Mesoscale Discussions in 2004
Mesoscale Discussion 970
The Storm Prediction Center issued this mesoscale discussion at May 28, 2004, 11:41 PM CDT for 22 counties in Iowa; 18 counties in Minnesota; 18 counties in South Dakota. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- May 28, 2004, 11:41 PM CDT (04:41 UTC)
- Expired
- May 29, 2004, 1:15 AM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
All 58 counties
Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Big Stone County, MN, Brown County, MN, Chippewa County, MN, Cottonwood County, MN, Jackson County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Redwood County, MN, Renville County, MN, Rock County, MN, Swift County, MN, Watonwan County, MN, Yellow Medicine County, MN, Beadle County, SD, Brookings County, SD, Clark County, SD, Clay County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 04:42 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
Aberdeen, SD (KABR), launched 00:00Z, 4.7 hours before the alert went out and 220 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
- 48 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 1790 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 242 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
823 ACUS11 KWNS 290441 SWOMCD SPC MCD 290441 IAZ000-MNZ000-NEZ000-SDZ000-290615- MESOSCALE DISCUSSION 0970 NWS STORM PREDICTION CENTER NORMAN OK 1141 PM CDT FRI MAY 28 2004 AREAS AFFECTED...ERN SD...SWRN MN AND NWRN/CNTRL IA CONCERNING...SEVERE THUNDERSTORM WATCH 320... VALID 290441Z - 290615Z TSTMS MAY PRODUCE LARGE HAIL ACROSS ERN SD...SWRN MN AND NWRN/CNTRL IA THROUGH THE EARLY MORNING HOURS OF SATURDAY. ISOLD DAMAGING WINDS MAY ALSO OCCUR ACROSS PARTS OF CNTRL IA. PROFILER/VAD WIND PROFILER DATA SUGGEST THAT THE SLY LOW LEVEL JET HAS INCREASED TO NEARLY 60 KTS...SIMILAR TO LATEST RUC FORECAST. AN IMPRESSIVE WARM ADVECTION REGIME ON THE NOSE OF THIS JET HAS BEEN SUPPORTING TSTMS...ESPECIALLY FROM NEAR WATERTOWN SEWD TOWARD FT. DODGE AND CARROLL IA. PARCELS FEEDING THE TSTMS EXHIBIT MUCAPE VALUES OF AROUND 1500 J/KG PER OBJECTIVE ANALYSIS AND GIVEN 45-50 KTS OF CAPE-BEARING SHEAR...POTENTIAL WILL EXIST FOR A FEW ELEVATED SUPERCELLS WITH LARGE HAIL. ADDITIONALLY...WHAT WERE SUPERCELLS EARLIER THIS EVENING IN THE SIOUX FALLS/SIOUX CITY AREAS HAVE EVOLVED INTO SMALL SCALE BOWS AND ARE MOVING INTO WCNTRL IA. THESE CELLS...WHILE PROBABLY ELEVATED ABOVE THE BOUNDARY LAYER...WILL CONTINUE TO HAVE A SMALL DAMAGING WIND PROBABILITY. TSTMS ARE EXPECTED TO DEVELOP NWD INTO POSSIBLY WCNTRL MN SEWD INTO NCNTRL IA IN A FEW HOURS. ..RACY.. 05/29/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MPX...DMX...FSD...OAX...ABR... 42109623 44429837 45469761 45729628 44929470 42099312
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:31 PM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Harrison, Ida, Lyon, Monona and 6 more | 89 min |
| 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 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 |
Nearby
Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in South Dakota, 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.