Alert archive / Minnesota / Mesoscale Discussions in 2004
Mesoscale Discussion 367
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2004, 12:39 PM CDT for 38 counties in Minnesota; Bayfield County, Burnett County, Douglas County, Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2004, 12:39 PM CDT (17:39 UTC)
- Expired
- Apr 18, 2004, 2:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Aitkin County, MN, Anoka County, MN, Benton County, MN, Big Stone County, MN, Carlton County, MN, Carver County, MN, Cass County, MN, Chippewa County, MN, Chisago County, MN, Cook County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hennepin County, MN, Hubbard County, MN, Isanti County, MN, Itasca County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Lake County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Otter Tail County, MN, Pine County, MN, Pope County, MN, Ramsey County, MN, Saint Louis County, MN, Sherburne County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wright County, MN, Bayfield County, WI, Burnett County, WI, Douglas County, WI
The radar
The Duluth radar (KDLH), 137 km from the middle of the area, began a volume at 17:39 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
Minneapolis, MN (KMPX), launched 12:00Z, 5.7 hours before the alert went out and 167 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
- 680 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 697 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 361 m²/s²
- 0-3 km storm-relative helicity
- 401 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
252 ACUS11 KWNS 181740 SWOMCD SPC MCD 181739 MNZ000-WIZ000-SDZ000-NDZ000-181945- MESOSCALE DISCUSSION 0367 NWS STORM PREDICTION CENTER NORMAN OK 1239 PM CDT SUN APR 18 2004 AREAS AFFECTED...CNTRL/NERN MN AND NWRN WI CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 181739Z - 181945Z POTENTIALLY VOLATILE SEVERE WEATHER SITUATION WAS BEGINNING TO DEVELOP ACROSS PARTS OF THE UPPER MS VALLEY EARLY THIS AFTERNOON. TORNADO WATCHES WILL LIKELY BE NEED ACROSS THE REGION IN THE NEXT FEW HOURS. LATEST MESOANALYSIS PLACES DEEPENING SURFACE LOW OVER NERN SD...EAST OF ABR...WITH VERY STRONG WARM FRONT EXTENDING EAST ACROSS CNTRL MN. MEANWHILE...VERY STRONG MID LEVEL TROUGH AND ASSOCIATED 90-100KT 500MB WIND MAX WAS RACING NEWD FROM ERN CO/WRN NE AND WILL AID RAPID INTENSIFICATION OF THE SURFACE LOW AND ASSOCIATED FRONTAL ZONES THROUGH TONIGHT. LATEST SHORT TERM MODEL GUIDANCE AND SATELLITE/RADAR TRENDS SEEM TO SUGGEST THAT CONVECTION NORTH OF THE SURFACE WARM FRONT AND SURFACE LOW SHOULD CONTINUE TO GRADUALLY STRENGTHEN AS INFLOW AIRMASS CONTINUES TO DESTABILIZE AND LARGE SCALE ASCENT ACROSS THE WARM FRONT INTENSIFIES. THIS ACTIVITY...SPREADING INTO THE ARROWHEAD OF MN...WILL LIKELY ROTATE AND PRODUCE LARGE HAIL GIVEN VERY STRONG DEEP LAYER SHEAR JUXTAPOSED 8-9 C/KM MID LEVEL LAPSE RATES. LATER THIS AFTERNOON...AS WARM FRONT/SURFACE LOW DEVELOP NWD/NEWD...AND EXIT REGION OF POWERFUL MID/UPPER JET OVERSPREADS THE WARM SECTOR... FORCING ASSOCIATED WITH THESE FEATURES COUPLED WITH STRONG INSOLATION AND RAPID ELIMINATION OF THE CAP SHOULD RESULT IN WIDESPREAD TSTM DEVELOPMENT AND NUMEROUS SUPERCELLS. FCST SHEAR AND INSTABILITY PARAMETERS NEAR THE LOW AND ALONG THE WARM FRONT ACROSS MN SHOULD INITIALLY SUPPORT DISCRETE... POTENTIALLY TORNADIC...STORMS ALONG WITH VERY LARGE HAIL AND HIGH WINDS. ..CARBIN.. 04/18/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DLH...MPX...FGF...ABR... 47189533 48499250 48059011 46499087 45859226 45099278 44719366 44889624 45519669 46309653
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 5 hr |
| Apr 17, 9:31 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 119 min |
| Apr 17, 10:05 PM CDT | Tornado Watch | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 5 hr |
| Apr 17, 11:10 PM CDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Cottonwood, Grant, Jackson, Kandiyohi and 14 more | 95 min |
| Apr 17, 11:35 PM CDT | Severe Thunderstorm Watch | SPC | Big Stone, Brown, Chippewa, Cottonwood, Jackson, Kandiyohi and 16 more | 5 hr |
| Apr 17, 11:50 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Houston and 7 more | 85 min |
| Apr 18, 12:30 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Carver, Chisago, Dakota, Goodhue, Hennepin and 11 more | 5 hr |
| Apr 18, 2:37 AM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Big Stone, Brown, Carlton and 40 more | 53 min |
| Apr 18, 4:43 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 15 more | 32 min |
| Apr 18, 8:04 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Carlton, Cass, Crow Wing, Douglas and 6 more | 86 min |
| Apr 18, 1:40 PM CDT | Tornado Watch | SPC | Aitkin, Anoka, Benton, Carlton, Carver, Chippewa and 32 more | 6 hr |
| Apr 18, 2:20 PM CDT | Severe Thunderstorm Watch | SPC | Lincoln, Lyon, Pipestone, Rock | 6 hr |
| Apr 18, 3:33 PM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Benton, Carlton, Chisago, Crow Wing and 12 more | 117 min |
| Apr 18, 4:15 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 15 more | 60 min |
| Apr 18, 4:40 PM CDT | Tornado Watch | SPC | Blue Earth, Cottonwood, Dodge, Faribault, Freeborn, Jackson and 6 more | 5 hr |
| Apr 18, 5:23 PM CDT | Mesoscale Discussion | SPC | Lincoln, Lyon, Pipestone, Rock | 2 hr |
| Apr 18, 6:35 PM CDT | Tornado Watch | SPC | Brown, Carver, Dakota, Goodhue, Hennepin, Le Sueur and 7 more | 5 hr |
| Apr 18, 1:49 AM CDT | Mesoscale Discussion | SPC | Calumet, Columbia, Dane, Dodge, Fond du Lac, Green and 11 more | 56 min |
Nearby
Mesoscale Discussions in Minnesota, 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.