Alert archive / Illinois / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 649
The Storm Prediction Center issued this severe thunderstorm watch at Aug 6, 2000, 1:30 PM CDT for 25 counties in Illinois; 17 counties in Iowa; 12 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2000, 1:30 PM CDT (18:30 UTC)
- Expired
- Aug 6, 2000, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 54 counties
Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox 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, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Dane County, WI, Green County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 1:54 PM CDT | Severe Thunderstorm Warning | MKX | Green | 66 min |
| Aug 6, 2:07 PM CDT | Tornado Warning | MKX | Green, Rock | 68 min |
| Aug 6, 2:47 PM CDT | Severe Thunderstorm Warning | ILX | Knox, Peoria | 43 min |
| Aug 6, 2:56 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 49 min |
| Aug 6, 2:59 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson, Washington, Waukesha | 61 min |
| Aug 6, 3:05 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Stark | 55 min |
| Aug 6, 3:12 PM CDT | Severe Thunderstorm Warning | MKX | Walworth | 63 min |
| Aug 6, 3:35 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 55 min |
| Aug 6, 3:40 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 35 min |
| Aug 6, 3:56 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 64 min |
| Aug 6, 4:18 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, LaSalle | 57 min |
| Aug 6, 4:42 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb | 33 min |
| Aug 6, 4:44 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane, Will | 61 min |
| Aug 6, 5:10 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 35 min |
| Aug 6, 5:45 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 15 min |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.5 hours before the alert went out and 56 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
- 1267 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- -0.3
- Supercell composite
- -3.2
The text
As transmitted, in the capitals the NWS used until 2016.
197 WWUS9 KMKC 061807 SEL9 MKC WW 061758 IAZ000-ILZ000-WIZ000-LMZ000-070000- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 649 STORM PREDICTION CENTER NORMAN OK 1258 PM CDT SUN AUG 6 2000 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN IOWA NORTHERN ILLINOIS SOUTHERN WISCONSIN SOUTHWEST LAKE MICHIGAN EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 700 PM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF CEDAR RAPIDS IOWA TO 30 MILES SOUTHEAST OF MILWAUKEE WISCONSIN. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. DISCUSSION...TSTMS ARE BEGINNING TO DEVELOP ALONG PRE-FRONTAL WIND SHIFT. 18Z RAOB FROM DVN SHOWED CAP TO HAVE WEAKENED...SO EXPLOSIVE DEVELOPMENT IS EXPECTED DURING THE NEXT HOUR. STRONG INSTABILITY AND SUFFICIENT DEEP LAYER SHEAR FOR SUPERCELLS SUGGEST THAT DAMAGING WINDS AND LARGE HAIL ARE LIKELY...WITH EVENTUAL EVOLUTION INTO A BOW ECHO BY LATE THIS AFTERNOON. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 29030. ...VESCIO 422,0920 433,0872 413,0872 401,0920
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 26 more | 6 hr |
| Aug 6, 2:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Iowa and 11 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2000Severe Thunderstorm Watches in Iowa, 2000Severe Thunderstorm Watches in Wisconsin, 2000Every severe thunderstorm watch in 2000
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.