Alert archive / Wisconsin / Mesoscale Discussions in 2004
Mesoscale Discussion 2170
The Storm Prediction Center issued this mesoscale discussion at Sep 5, 2004, 6:30 PM CDT for 6 counties in Minnesota; 17 counties in Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 5, 2004, 6:30 PM CDT (23:30 UTC)
- Expired
- Sep 5, 2004, 8:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 23 counties
Fillmore County, MN, Goodhue County, MN, Houston County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Marathon County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 37 km from the middle of the area, began a volume at 23:36 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
Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 216 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
- 246 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 698 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 282 m²/s²
- 0-3 km storm-relative helicity
- 329 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
702 ACUS11 KWNS 052333 SWOMCD SPC MCD 052330 WIZ000-IAZ000-MNZ000-060130- MESOSCALE DISCUSSION 2170 NWS STORM PREDICTION CENTER NORMAN OK 0630 PM CDT SUN SEP 05 2004 AREAS AFFECTED...SE MN/WRN WI CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 052330Z - 060130Z ...ISOLATED SVR POTENTIAL FOR NEXT FEW HOURS BUT NO WW IS CURRENTLY ANTICIPATED... STORMS ARE LIFTING RAPIDLY NEWD ACROSS WRN WI AND APPEAR TO BE MOVING EAST OF THE LOW LEVEL JET AXIS. THIS COMBINED WITH THE FACT THAT DIURNAL INSTABILITY WILL BE DECREASING OVER THE NEXT FEW HOURS SHOULD LIMIT SEVERE THREAT. RECENT VELOCITY IMAGERY FROM THE MINNEAPOLIS RADAR INDICATES SEVERAL ROTATIONAL COUPLETS...SO THERE IS A THREAT FOR ISOLATED TORNADOES FOR THE NEXT 2-3 HOURS OR SO. RECENT VWP DATA ALSO FROM MPX SHOW NEARLY 40 KT OF 0-1KM SHEAR AND FAVORABLE HODOGRAPH STRUCTURE FOR ROTATING STORMS. THE OVERALL THREAT APPEARS LIMITED ENOUGH HOWEVER...SO AN ADDITIONAL WATCH IS NOT EXPECTED. ..TAYLOR.. 09/05/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...GRB...MKX...ARX...MPX... 43439120 43619267 45109280 45249000 44728961 43459001
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 2:34 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Cottonwood and 27 more | 56 min |
| Sep 5, 3:00 PM CDT | Tornado Watch | SPC | Blue Earth, Brown, Carver, Chippewa, Cottonwood, Dakota and 25 more | 6 hr |
| Sep 5, 4:42 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Becker, Benton, Carlton, Cass and 19 more | 2 hr |
| Sep 5, 5:39 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Cottonwood, Dakota, Faribault and 23 more | 96 min |
Nearby
Mesoscale Discussions in Wisconsin, 2004Mesoscale Discussions in Minnesota, 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.