Alert archive / Iowa / Mesoscale Discussions in 2005
Mesoscale Discussion 4
The Storm Prediction Center issued this mesoscale discussion at Jan 1, 2005, 12:45 PM CST for 20 counties in Illinois; 32 counties in Iowa; 17 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 1, 2005, 12:45 PM CST (18:45 UTC)
- Expired
- Jan 1, 2005, 4:45 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 69 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Marshall County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Washington County, IA, Winneshiek County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 18:48 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
Davenport, (KDVN), launched 12:00Z, 6.8 hours before the alert went out and 68 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1502 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
316 ACUS11 KWNS 011845 SWOMCD SPC MCD 011845 ILZ000-WIZ000-IAZ000-MNZ000-012245- MESOSCALE DISCUSSION 0004 NWS STORM PREDICTION CENTER NORMAN OK 1245 PM CST SAT JAN 01 2005 AREAS AFFECTED...CENTRAL/ERN IA...SRN WI AND PORTIONS OF NRN IL CONCERNING...FREEZING RAIN AND SLEET VALID 011845Z - 012245Z A MIX OF FREEZING RAIN AND SLEET WILL CONTINUE ACROSS THE REGION THROUGH AFTERNOON...WITH DEVELOPMENT INTO SCENTRAL WI AND NRN IL THROUGH 21Z. HRLY ACCUMULATIONS OF ICE FROM 0.05-0.10 INCHES WILL BE POSSIBLE WITH THE HEAVIER CONVECTIVE SHOWERS. LOW LEVEL ADVECTIVE COMPONENT WILL REMAIN WEAKER THAN FARTHER NORTH THUS EXPECT OVERALL LIGHTER ACCUMULATIONS OF FREEZING RAIN/SLEET THAN ACROSS FAR NRN IA/MN AND CENTRAL WI. HOWEVER...ISENTROPIC LIFT NORTH OF SFC FRONT WILL REMAIN MODERATE AND COMBINED WITH ELEVATED INSTABILITY...MUCAPES FROM 50-150 J/KG ...WILL SUPPORT HEAVIER CONVECTIVE FREEZING RAIN/SLEET SHOWERS ACROSS THE AREA THROUGH 00Z. AN EARLIER BAND OF PRECIPITATION THAT MOVED ACROSS CENTRAL/ERN IA INTO SWRN WI HAS ALLOWED FOR SUFFICIENT SATURATION SO THAT ANY ADDITIONAL PRECIPITATION WILL BE EFFICIENT IN REACHING THE GROUND. LOW LEVEL WAA WILL LEAD TO NWD MOVEMENT OF THE SFC FREEZING LINE THROUGH THE AFTERNOON...BUT SINCE SFC LOW MVMNT WILL BE ENEWD INTO SERN NEB AND WET-BULB EFFECTS WILL BE OCCURRING...IT IS NOT ANTICIPATED THAT THE SFC FREEZING LINE WILL MOVE MUCH NORTH OF I-80 THROUGH 00Z. OVER SCENTRAL WI/NRN IL WHERE PRECIPITATION HAS NOT FALLEN MUCH TODAY...A DELAY IN LOW-MID LEVEL SATURATION SHOULD PROVIDE FOR SLEET AS THE PREDOMINATE PTYPE FOR THE FIRST HOUR OR SO OF ONSET OF PRECIP. PRECIP IS NOT ANTICIPATED TO CHANGE OVER TO FREEZING RAIN OVER THE IMMEDIATE CHI METRO AREA...WHERE NELY WINDS OFF LK MI SHOULD KEEP TEMPERATURES ABOVE FREEZING. ..CROSBIE.. 01/01/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ...NOTICE... SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 00-01 UTC... 06-07 UTC...12-13 UTC...AND 18-19 UTC AS SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS UNFOLD. THIS SCHEDULE WILL BE USED FROM DECEMBER 1 THROUGH FEBRUARY 28. ATTN...WFO...LOT...ILX...MKX...DVN...ARX...DMX... 43689076 42909326 42199377 41679346 41259186 41119084 41118952 41298867 41818767 43488808
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 6:48 AM CST | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 29 more | 4 hr |
| Jan 1, 12:32 PM CST | Mesoscale Discussion | SPC | Allamakee, Buena Vista, Cerro Gordo, Chickasaw, Clay, Dickinson and 18 more | 5 hr |
| Jan 1, 1:01 PM CST | Mesoscale Discussion | SPC | Bayfield, Burnett, Douglas, Washburn | 5 hr |
Nearby
Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in Illinois, 2005Mesoscale Discussions in Wisconsin, 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.