Alert archive / Wisconsin / Mesoscale Discussions in 2005
Mesoscale Discussion 2016
The Storm Prediction Center issued this mesoscale discussion at Aug 18, 2005, 2:09 PM CDT for 4 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2005, 2:09 PM CDT (19:09 UTC)
- Expired
- Aug 18, 2005, 3:45 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 48 counties
Allamakee County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Jones County, IA, Scott County, IA, Winneshiek County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Lee County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Fillmore County, MN, Houston County, MN, Winona County, MN, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI
The radar
The La Crosse radar (KARX), 126 km from the middle of the area, began a volume at 19:10 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
Davenport, (KDVN), launched 12:00Z, 7.2 hours before the alert went out and 153 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
- 757 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 763 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 5.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 181909 SWOMCD SPC MCD 181909 WIZ000-ILZ000-IAZ000-MNZ000-182045- MESOSCALE DISCUSSION 2016 NWS STORM PREDICTION CENTER NORMAN OK 0209 PM CDT THU AUG 18 2005 AREAS AFFECTED...PORTIONS NERN AND EXTREME E-CENTRAL IA...NWRN IL...SWRN/S-CENTRAL WI...EXTREME SERN MN CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 181909Z - 182045Z WW MAY BE REQUIRED ACROSS SOME PORTION OF THIS REGION...WITH SEVERE POTENTIAL INCREASING OVER NEXT FEW HOURS. DAMAGING GUSTS...TORNADOES AND OCCASIONAL LARGE HAIL ARE POSSIBLE. SFC MESOANALYSIS SHOWS WELL-DEFINED LOW OVER SERN MN -- N RST AS OF 19Z -- FCST TO MOVE EWD INTO SWRN/S-CENTRAL WI THROUGH REMAINDER AFTERNOON. WARM FRONT EXTENDS SEWD FROM LOW ACROSS SWRN WI INTO OUTFLOW POOL LEFT BY MORNING MCS. WARM FRONT WILL CONTINUE LIFTING NWD AND WRN PORTION OF OLD OUTFLOW POOL WILL FAVORABLY MODIFY. 80S SFC TEMPS AND 70S DEW POINTS -- EVIDENT IN WARM SECTOR ALONG AND S OF WARM FRONT AND OUTFLOW BOUNDARY -- SHOULD SUPPORT MLCAPES AROUND 2000 J/KG BASED ON MODIFIED RUC SOUNDINGS. LOW LEVEL VERTICAL SHEAR PROFILES SHOULD REMAIN MAXIMIZED INVOF WARM FRONT...WHERE BACKED SFC WINDS CONTRIBUTE TO ENLARGED LOW LEVEL HODOGRAPHS AND 0-1 KM SRH OF 150-250 J/KG SRH IN 0-1 KM AGL LAYER. THOSE VALUES -- DERIVED FROM OBSERVED REGIONAL VWP DATA...ARE SUBSTANTIALLY HIGHER THAN INDICATED BY SHORT TERM RUC ANALYSES AND FCSTS...AND SUPPORT SUPERCELL/TORNADO THREAT PARTICULARLY NEAR WARM FRONT. FARTHER S...ISALLOBARICALLY FORCED VEERING OF SFC FLOW OVER MUCH OF IA SHOULD SHIFT EWD INTO IL THIS AFTERNOON S OF OUTFLOW BOUNDARY...LIMITING CONVERGENCE AND LOW LEVEL SHEAR...HOWEVER SEVERE GUSTS AND HAIL WILL BE POSSIBLE. IN IMMEDIATE VICINITY OF LOW/MIDDLE LEVEL CYCLONE OVER SERN MN...0-1 KM SRH APPEARS SMALL BECAUSE OF WEAKER FLOW...HOWEVER VERY LOCALIZED AREA OF JUXTAPOSITION EXISTS BETWEEN FAVORABLE SFC VORTICITY MAX AND LOW LEVEL CAPE FIELD. POSSIBILITY OF NONSUPERCELL TORNADOES CANNOT BE RULED OUT AS THAT REGIME SHIFTS EWD ACROSS REMAINDER EXTREME SERN MN AND LSE REGION INTO SWRN WI. ..EDWARDS.. 08/18/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...GRB...LOT...ILX...MKX...DVN...ARX...DMX... 41189032 41939139 42939212 43919236 44279184 44479098 44469000 44378957 44098911 43708862 43128861 42498873 41408896 41098934
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 9:00 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DeWitt and 34 more | 2 hr |
| Aug 18, 9:25 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 6 hr |
| Aug 18, 1:16 PM CDT | Mesoscale Discussion | SPC | Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more | 89 min |
| Aug 18, 4:49 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Hancock, Pike, Schuyler | 116 min |
| Aug 18, 5:35 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Fulton, Greene, Hancock and 9 more | 6 hr |
| Aug 18, 2:50 PM CDT | Tornado Watch | SPC | Allamakee, Clayton | 6 hr |
| Aug 17, 9:22 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 7 more | 23 min |
| Aug 18, 5:47 PM CDT | Mesoscale Discussion | SPC | Adams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 24 more | 58 min |
| Aug 18, 5:50 PM CDT | Tornado Watch | SPC | Dodge, Fond du Lac, Green Lake, Jefferson, Kenosha, Walworth and 2 more | 5 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2005Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Iowa, 2005Every mesoscale discussion in 2005
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.