Alert archive / Illinois / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 107, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Sep 11, 2000, 8:57 PM CDT for 4 counties in Illinois. It was in force for 48 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 11, 2000, 8:57 PM CDT (01:57 UTC)
- Expired
- Sep 11, 2000, 9:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Chicago, IL
- Area
- Whole counties
Counties Boone County, IL, DeKalb County, IL, Lee County, IL, Ogle County, IL
The radar
The Chicago radar (KLOT), 92 km from the middle of the area, began a volume at 01:57 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 11, 9:15 PM CDT | Thunderstorm Wind 58 E | Kirkland, IL | |
| Sep 11, 9:50 PM CDT | Hail 0.75 | De Kalb, IL |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 11, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 127 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
- 1371 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 2176 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 11, 2:40 PM CDT, 6 hours 17 minutes earlier.
Area forecast discussion, Sep 11, 2:40 PM CDT, 6 hours 17 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHICAGO IL 240 PM CDT MON SEP 11 2000 AVN WAS ABOUT ONLY MODEL THAT PICKED UP WELL ON MCS IN ERN IA AND NWRN IL THIS ERY AM AND SEEMS LIKE THE BETTER BET. MAV NUMBERS ALSO PREDICTED HIGHS ARND 90 TODAY WHICH I WAS TOO CONSERVATIVE ON FOR YESTERDAY'S RUN. AVN NOW APPEARS TO BE MODEL OF CHOICE FOR THIS ROUND. REMNANTS OF THE OLD STNRY FRONT STILL MAINTAINED A DECENT DISCONTINUITY OF TEMPS AND DWPTS THIS MRNG WITH GOOD LI'S. SO IS NOT SURPRISING THAT CONVECTION BLEW UP SO QUICK. OUTFLOWS HAVE TILTED FRONT SOUTHEAST AND NOW DOWN LAKE MICHIGAN RESULTING IN TEMPS DROPPING ALONG THE LAKE TO THE UPPER 60S WHILE 90S DOWN TOWARD JOLIET. OUTFLOW VERY VISIBLE ON RADAR DROPPING SOUTH THROUGH NERN IL WITH NEW CONVECTION IN ITS WAKE. TSTMS DIMINISHING ALONG WISCONSIN BORDER BUT NEW CONVECTION FIRING IN NERN IA/SWRN WI. THIS ALL AHEAD OF MAIN COLD FRONT THAT STRETCHES FROM NWRN WI THRUGH SERN MN TO SWRN IA. ON RADAR MOSAIC, CAN SEE CONVECTION BLOOMING SOUTH OF MSP. THIS TO BLOSSOM INTO GOOD CONVECTION WITH FROPA LATE TONIGHT. SO WHILE SVR WATCHES MAY EXPIRE...SHWRS/TSTMS STILL IN FORECAST OVERNIGHT. SPENES MENTIONING PSSBLE FLOODING FROM WINNEBAGO TO NRN COOK COUNTY LATE THIS AFTN. GUIDANCE VALUES 3-4 INCHES IN 1-3 HOURS SO GOING TO NEED SEVERAL HOURS OF 1-2 INCH RAINFALL AMOUNTS. WILL CONSIDER FFWATCH TONIGHT WITH COORDINATION WITH DVN. WILL FAVOR OUTFLOW TO KEEP DROPPING SOUTH TO AVOID TRAINING THIS EVENING. MODELS STILL LOOKING FROM FROPA AROUND DAYBREAK...SO LINGERING SHOWERS IN THE MORNING TUESDAY. THEN HIGH BUILDING IN AND TURNING ANTICYCLONIC IN THE AFTN SO CLEARING SKIES WITH LITTLE BACKWASH EXPECTED TUESDAY. VERY COOL OVERNIGHT TUESDAY NIGHT WITH ONLY 70S WEDNESDAY EVEN WITH AID OF SW WINDS. ANOTHER FROPA DROPPING SOUTHEAST OUT OF CANADA ON THURSDAY WITH ANOTHER CHC OF SHOWERS ON THURSDAY. THIS FOLLOWED BY REINFORCING BLAST OF COLD TEMPS WITH HIGHS ONLY IN 60S FOR FRI AND SAT. .CHI...NONE BRUMER
In the hours before
Special weather statement, Sep 11, 3:42 PM CDT, 5 hours 15 minutes before
ILZ003>006-008-010>014-019>023-032>033-039-INZ001>002-010>011-019- 112133- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 342 PM CDT/EST MON SEP 11 2000 AT 340 PM...AN AREA OF STRONG THUNDERSTORMS WAS OVER PORTIONS OF NORTH CENTRAL AND NORTHEAST ILLINOIS. RADAR INDICATED THAT THE STRONGEST STORMS WERE FROM SOUTHEAST OGLE COUNTY...NORTHWEST OF ROCHELLE...EAST THROUGH THE SOUTHERN PORTIONS OF THE CHICAGO METROPOLITAN AREA...INCLUDING TINLEY PARK...BLUE ISLAND AND CALUMET CITY. INDIVIDUAL STORMS WERE MOVING EAST AT 15 MPH...WHILE THE ENTIRE AREA OF STORMS DRIFTS SLOWLY TO THE SOUTH. WIND GUSTS OF 40 TO 50 MPH...SMALL HAIL...AND RAINFALL AMOUNTS IN EXCESS OF TWO INCHES HAVE OCCURRED WITH THESE STRONGER STORMS. NEW STORMS WILL LIKELY DEVELOP OVER PORTIONS OF LASALLE...GRUNDY AND KANKAKEE COUNTIES BETWEEN 340 PM AND 430 PM THIS AFTERNOON. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 7 PM FOR PORTIONS OF NORTHERN ILLINOIS. MONITOR LATER STATEMENTS FROM THE NATIONAL WEATHER SERVICE FOR ADDITIONAL INFORMATION. RATZER N
Special weather statement, Sep 11, 4:26 PM CDT, 4 hours 31 minutes before
ILZ014-021>022-INZ001>002-112230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 426 PM CDT MON SEP 11 2000 ...HEAVY THUNDERSTORMS ROLLING THROUGH AREA FROM GRUNDY COUNTY TO NORTHWEST INDIANA... HEAVY THUNDERSTORMS ARE MOVING SOUTHEAST THROUGH GRUNDY... WILL... AND SOUTHERN COOK COUNTY IN ILLINOIS AND LAKE AND PORTER COUNTIES IN INDIANA. THESE STORMS ARE LIKELY TO PRODUCE SOME LOCALIZED FLOODING FROM HEAVY DOWNPOURS AND DO CONTAIN SOME VERY DANGEROUS LIGHTNING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE AREA UNTIL 700 PM THIS EVENING. THUS THESE STORMS COULD ALSO PRODUCE STRONG WINDS AND LARGE HAIL. BRUMER N
Local storm report, Sep 11, 5:44 PM CDT, 3 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
544 PM CDT MON SEP 11 2000
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0203 PM FORRESTON IL 1 INCH HAIL
09/11/00 OGLE REPORTED BY EMERGENCY
MANAGEMENT.
0306 PM DOWNERS GROVE IL .75 INCH HAIL
09/11/00 DUPAGE REPORTED BY EMERGENCY
MANAGEMENT. OCCURRED
AT INTERSECTION OF
INTERSTATE 88 AND
FINLEY ROAD.
0310 PM 5 N ROCHELLE IL .88 INCH HAIL
09/11/00 OGLE REPORTED BY STORM
SPOTTER.
0325 PM SCHAUMBURG IL .75 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER.
0350 PM GRIFFITH IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER. TWO TREES
DOWNED BLOCKING HIGHWAY
6 IN GRIFFITH.
0356 PM MARKHAM IL .88 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER. OCCURRED AT
INTERSECTION OF 159TH
AND CRAWFORD ROAD.
0409 PM PORTAGE IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
0409 PM PORTAGE IN .75 INCH HAIL
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
NLocal storm report, Sep 11, 6:10 PM CDT, 2 hours 47 minutes before
PRELIMINARY LOCAL STORM REPORT...UPDATED/CORRECTION FOR TIME...
NATIONAL WEATHER SERVICE CHICAGO IL
610 PM CDT MON SEP 11 2000
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1230 PM MACHESNEY IL .75 INCH HAIL
09/11/00 WINNEBAGO REPORTED BY PUBLIC.
0203 PM FORRESTON IL 1 INCH HAIL
09/11/00 OGLE REPORTED BY EMERGENCY
MANAGEMENT.
0306 PM DOWNERS GROVE IL .75 INCH HAIL
09/11/00 DUPAGE REPORTED BY EMERGENCY
MANAGEMENT. OCCURRED
AT INTERSECTION OF
INTERSTATE 88 AND
FINLEY ROAD.
0310 PM 5 N ROCHELLE IL .88 INCH HAIL
09/11/00 OGLE REPORTED BY STORM
SPOTTER.
0325 PM SCHAUMBURG IL .75 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER.
0350 PM GRIFFITH IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER. TWO TREES
DOWNED BLOCKING HIGHWAY
6 IN GRIFFITH.
0356 PM MARKHAM IL .88 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER. OCCURRED AT
INTERSECTION OF 159TH
AND CRAWFORD ROAD.
0409 PM PORTAGE IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
0409 PM PORTAGE IN .75 INCH HAIL
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
SMITTY
NNNNLocal storm report, Sep 11, 6:13 PM CDT, 2 hours 44 minutes before
PRELIMINARY LOCAL STORM REPORT...UPDATED...
NATIONAL WEATHER SERVICE CHICAGO IL
544 PM CDT MON SEP 11 2000
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1230 PM MACHESNEY IL .75 INCH HAIL
09/11/00 WINNEBAGO REPORTED BY PUBLIC.
0203 PM FORRESTON IL 1 INCH HAIL
09/11/00 OGLE REPORTED BY EMERGENCY
MANAGEMENT.
0306 PM DOWNERS GROVE IL .75 INCH HAIL
09/11/00 DUPAGE REPORTED BY EMERGENCY
MANAGEMENT. OCCURRED
AT INTERSECTION OF
INTERSTATE 88 AND
FINLEY ROAD.
0310 PM 5 N ROCHELLE IL .88 INCH HAIL
09/11/00 OGLE REPORTED BY STORM
SPOTTER.
0325 PM SCHAUMBURG IL .75 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER.
0350 PM GRIFFITH IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER. TWO TREES
DOWNED BLOCKING HIGHWAY
6 IN GRIFFITH.
0356 PM MARKHAM IL .88 INCH HAIL
09/11/00 COOK REPORTED BY STORM
SPOTTER. OCCURRED AT
INTERSECTION OF 159TH
AND CRAWFORD ROAD.
0409 PM PORTAGE IN WIND DAMAGE
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
0409 PM PORTAGE IN .75 INCH HAIL
09/11/00 LAKE REPORTED BY STORM
SPOTTER.
SMITTY
NNNNSpecial weather statement, Sep 11, 7:05 PM CDT, 1 hour 52 minutes before
ILZ005>006-012>014-020>022-INZ001>002-120105- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO IL 705 PM CDT MON SEP 11 2000 THE SEVERE THUNDERSTORM WATCH FOR NORTHEAST ILLINOIS AND ADJACENT NORTHWEST INDIANA EXPIRED AT 700 PM. A LINE OF THUNDERSTORMS EXTENDING FROM SOUTHWEST WISCONSIN ACROSS FAR NORTHWEST ILLINOIS AND INTO EASTERN IOWA WILL CONTINUE TO MOVE EAST THIS EVENING AS A STRONG COLD FRONT PUSHES INTO THE REGION.< THE STORMS ARE EXPECTED TO MOVE INTO NORTHEAST ILLINOIS LATE THIS EVENING. THEY WILL LIKELY PRODUCE FREQUENT LIGHTNING...HEAVY DOWNPOURS AND GUSTY WINDS AS THEY MOVE THROUGH BUT SEVERE WEATHER IS NOT ANTICIPATED. N
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Ogle, Winnebago | 38 min |
| Sep 11, 8:07 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 38 min |
| Sep 11, 8:25 PM CDT | Tornado Warning | LOT | Ogle | 10 min |
| Sep 11, 8:57 PM CDT | Severe Thunderstorm Warning | LOT | Kane, McHenry | 48 min |
| Sep 11, 9:28 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Lake | 47 min |
| Sep 11, 9:58 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, LaSalle, Will | 62 min |
| Sep 11, 10:50 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 55 min |
| Sep 11, 11:44 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee, Livingston | 61 min |
| Sep 12, 12:16 AM CDT | Severe Thunderstorm Warning | LOT | Benton, Jasper, Newton | 59 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2000Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.