Alert archive / Minnesota / Mesoscale Discussions in 2004
Mesoscale Discussion 1920
The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2004, 12:17 PM CDT for 16 counties in Iowa; 25 counties in Minnesota; 5 counties in Wisconsin. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2004, 12:17 PM CDT (17:17 UTC)
- Expired
- Aug 8, 2004, 1:15 PM CDT
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 46 counties
Cerro Gordo County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, O'Brien County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Anoka County, MN, Blue Earth County, MN, Carver County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Buffalo County, WI, Dunn County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 112 km from the middle of the area, began a volume at 17:16 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, 5.3 hours before the alert went out and 111 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
- 362 J/kg
- Mixed-layer CIN
- -202 J/kg
- Mixed-layer LCL
- 1170 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
082 ACUS11 KWNS 081718 SWOMCD SPC MCD 081717 WIZ000-MNZ000-IAZ000-081815- MESOSCALE DISCUSSION 1920 NWS STORM PREDICTION CENTER NORMAN OK 1217 PM CDT SUN AUG 08 2004 AREAS AFFECTED...PORTIONS OF SERN MN...WRN WI AND NRN IA CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 081717Z - 081815Z MONITORING PORTIONS OF SERN MN...WRN WI AND NRN IA FOR A POSSIBLE WW WITHIN THE NEXT HOUR OR SO. AT 17Z...A SURFACE TROUGH EXTENDED FROM NEAR STC TO 30 E RWF TO 50 SE FSD. AIR MASS HAS DESTABILIZED WITH MLCAPES FROM 1000-1500 J/KG ...AND SHOULD DESTABILIZE FURTHER WITH ADDITIONAL HEATING. A FEW ELEVATED STORMS ARE LOCATED ALONG THE SURFACE TROUGH ABOUT 30 SE RWF. HOWEVER...AS TEMPERATURES WARM INTO THE LOWER 80S...THE CAPPING INVERSION IS EXPECTED TO WEAKEN AND SURFACE BASED STORMS SHOULD DEVELOP ALONG AND AHEAD OF THE SURFACE TROUGH. MODERATE INSTABILITY AND DEEP LAYER SHEAR OF 25-30 KT MAY BE SUFFICIENT FOR STORMS WITH SEVERE HAIL AND SOME WIND DAMAGE. ..IMY.. 08/08/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ARX...MPX...DMX...FSD... 42979583 43319568 44229444 45099404 45359391 45509251 44739141 42549306 42489424
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 1:05 PM CDT | Mesoscale Discussion | SPC | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie | 55 min |
| Aug 8, 12:37 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Douglas, Grant, Kittson, Mahnomen and 8 more | 83 min |
| Aug 8, 12:55 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Kittson, Mahnomen, Marshall, Norman and 5 more | 5 hr |
| Aug 8, 4:02 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Cass, Clay, Clearwater, Hubbard and 11 more | 88 min |
| Aug 8, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Beltrami, Cass, Clay, Clearwater, Crow Wing and 17 more | 5 hr |
| Aug 8, 5:03 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Carver, Chisago, Dakota and 31 more | 117 min |
| Aug 8, 5:20 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Brown, Carver, Chisago, Dakota and 21 more | 7 hr |
Nearby
Mesoscale Discussions in Minnesota, 2004Mesoscale Discussions in Iowa, 2004Mesoscale Discussions in Wisconsin, 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.