Alert archive / Illinois / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 84, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 6, 2015, 5:44 PM CDT for Lee County, Illinois. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 6, 2015, 5:44 PM CDT (22:44 UTC)
- Expired
- Jul 6, 2015, 6:14 PM CDT
- In force
- 30 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Lee County, IL
The radar
The Chicago radar (KLOT), 102 km from the middle of the area, began a volume at 22:44 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, 10.7 hours before the alert went out and 101 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
- 200 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 1201 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -74 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 6, 5:24 PM CDT, 20 minutes earlier.
Area forecast discussion, Jul 6, 5:24 PM CDT, 20 minutes before
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</html>Hazardous weather outlook, Jul 6, 4:36 PM CDT, 1 hour 8 minutes before
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Local storm report, Jul 6, 2:16 PM CDT, 3 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
216 PM CDT MON JUL 06 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0145 PM HEAVY RAIN ELBURN 41.89N 88.47W
07/06/2015 M0.95 INCH KANE IL COCORAHS
RAIN FELL IN PAST 45 MINUTES.
&&
ACSSpecial weather statement, Jul 6, 2:59 PM CDT, 2 hours 45 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 259 PM CDT MON JUL 6 2015 ILZ013-014-019>022-062045- DUPAGE IL-WILL IL-KENDALL IL-COOK IL-LA SALLE IL-GRUNDY IL- 259 PM CDT MON JUL 6 2015 ...SPECIAL WEATHER STATEMENT FOR EAST CENTRAL LA SALLE...SOUTH CENTRAL COOK...WESTERN WILL...SOUTHEASTERN DUPAGE...SOUTHEASTERN KENDALL AND GRUNDY COUNTIES UNTIL 345 PM CDT... AT 258 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR PLAINFIELD TO NEAR SENECA...AND MOVING EAST AT 20 MPH. WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... JOLIET... NAPERVILLE... BOLINGBROOK... ORLAND PARK... OAK LAWN... ROMEOVILLE... PLAINFIELD... LOCKPORT... NEW LENOX... HOMER GLEN... LEMONT... MORRIS... CHANNAHON... MINOOKA... WORTH... BURR RIDGE... WILLOW SPRINGS... SENECA... WILMINGTON... INGALLS PARK... INCLUDING THE FOLLOWING INTERSTATES... I-55 BETWEEN MILE MARKERS 227 AND 271. I-80 BETWEEN MILE MARKERS 107 AND 142. I-355 BETWEEN MILE MARKERS 1 AND 13. THIS INCLUDES... ARGONNE NATIONAL LABORATORY...UNIVERSITY OF ST. FRANCIS...CHANNAHON STATE PARK...CHICAGOLAND SPEEDWAY ROUTE 66 RACEWAY...GEBHARD WOODS STATE PARK...GRUNDY COUNTY SPEEDWAY AND FAIRGROUNDS...JOLIET JUNIOR COLLEGE...JOLIET SLAMMERS BASEBALL...LEWIS UNIVERSITY...MORAINE VALLEY COMMUNITY COLLEGE...AND WILLIAM G STRATTON STATE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 4118 8825 4121 8871 4172 8816 4172 8777 TIME...MOT...LOC 1958Z 252DEG 16KT 4161 8815 4123 8864 LENNING
Special weather statement, Jul 6, 3:55 PM CDT, 1 hour 49 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
355 PM CDT MON JUL 6 2015
ILZ014-INZ001-062130-
COOK IL-LAKE IN-
355 PM CDT MON JUL 6 2015
...SPECIAL WEATHER STATEMENT FOR SOUTHEASTERN COOK AND NORTHWESTERN
LAKE COUNTIES UNTIL 430 PM CDT...
AT 354 PM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS
ALONG A LINE EXTENDING FROM CHATHAM TO PHOENIX...AND MOVING
NORTHEAST AT 25 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS AND
TORRENTIAL DOWNPOURS ARE LIKELY.
LOCATIONS IMPACTED INCLUDE...
CHICAGO... HAMMOND... GARY...
OAK LAWN... CALUMET CITY... EAST CHICAGO...
BLUE ISLAND... DOLTON... ALSIP...
MIDLOTHIAN... CHATHAM... POSEN...
WHITING... BURNHAM... HARVEY...
SOUTH HOLLAND... EVERGREEN PARK... HOMEWOOD...
HAZEL CREST... MARKHAM...
INCLUDING THE FOLLOWING INTERSTATES...
I-57 BETWEEN MILE MARKERS 349 AND 358.
I-80 NEAR MILE MARKER 155.
I-94 BETWEEN MILE MARKERS 61 AND 73.
I-294 BETWEEN MILE MARKERS 61 AND 73.
INDIANA I-90 BETWEEN MILE MARKERS 1 AND 6.
THIS INCLUDES... SOUTH SUBURBAN COLLEGE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 4157 8769 4170 8775 4179 8757 4178 8756
4177 8756 4175 8753 4171 8753 4167 8748
4167 8744 4168 8743 4168 8742 4167 8742
4165 8744 4164 8740
TIME...MOT...LOC 2054Z 247DEG 21KT 4171 8765 4162 8763
RCThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 2:59 PM CDT | Special Weather Statement | LOT | Grundy | 46 min |
| Jul 6, 3:38 PM CDT | Small Craft Advisory | LOT | 39 hr | |
| Jul 6, 3:55 PM CDT | Special Weather Statement | LOT | Cook | 35 min |
| Jul 6, 4:34 PM CDT | Beach Hazards Statement | LOT | Lake | 35 hr |
| Jul 6, 4:35 PM CDT | Special Marine Warning | LOT | 85 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2015Every severe thunderstorm warning in 2015
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.