Alert archive / Illinois / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 89, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jul 13, 2015, 8:17 AM CDT for Ford County, Livingston County, Illinois. It was in force for 43 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 13, 2015, 8:17 AM CDT (13:17 UTC)
- Expired
- Jul 13, 2015, 9:00 AM CDT
- In force
- 43 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Ford County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 99 km from the middle of the area, began a volume at 13:21 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 13, 4:14 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 1.3 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
- 2535 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 1016 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 10.6
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 13, 7:04 AM CDT, 1 hour 13 minutes earlier.
Area forecast discussion, Jul 13, 7:04 AM CDT, 1 hour 13 minutes before
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</html>Hazardous weather outlook, Jul 13, 4:54 AM CDT, 3 hours 23 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 454 AM CDT MON JUL 13 2015 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 141000- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 454 AM CDT MON JUL 13 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...THE STRONGEST OF WHICH MAY PRODUCE: EXTREME WIND GUSTS TO 80 MPH. HAIL TO AT LEAST GOLF BALL SIZE. TORNADOES...INCLUDING A STRONG TORNADO OR TWO. TORRENTIAL DOWNPOURS AND FLASH FLOODING. AREAS AFFECTED AND TIMING: A COMPLEX OF THUNDERSTORMS WILL IMPACT AREAS MAINLY ALONG AND NORTH OF INTERSTATE 80 THROUGH MID MORNING... THUNDERSTORMS CANNOT BE RULED OUT FROM THE LATE MORNING THROUGH THE EARLY AFTERNOON...BUT THE MAIN FOCUS FOR ANOTHER ROUND OF SEVERE THUNDERSTORMS LOOKS TO BE FROM THE MID AFTERNOON THROUGH MID TO LATE EVENING FOR THE ENTIRE OUTLOOK AREA. DISCUSSION: A THUNDERSTORM COMPLEX MOVING SOUTHEAST THROUGH WISCONSIN HAS SHOWN A TENDENCY FOR SOME INTENSIFICATION EARLY THIS MORNING...AND IT IS EXPECTED TO BRING A THREAT FOR DAMAGING WIND GUSTS TO AREAS MAINLY ALONG AND NORTH OF INTERSTATE 80 THROUGH MID MORNING. THERE MAY BE A THREAT FOR AN ISOLATED TORNADO WITH THIS COMPLEX. THE NEXT ROUND OF POTENTIALLY MORE WIDESPREAD HIGH-END SEVERE WEATHER IS EXPECTED TO UNFOLD MID AFTERNOON THROUGH THE MID TO LATE EVENING HOURS. EXTREME INSTABILITY AND STRONG WIND SHEAR WILL BE SUPPORTIVE OF ALL SEVERE HAZARDS IN ANY SEVERE STORM. ANY DISCRETE SUPERCELL COULD PRODUCE A STRONG TORNADO OR TWO...AND THE FAVORED AREA FOR THIS MAY END UP BEING IN A CORRIDOR FROM NORTHWEST ILLINOIS TO THE FAR SOUTH AND SOUTHWEST CHICAGO METRO AND POINTS SOUTH AND WEST. LARGE TO VERY LARGE HAIL WILL ALSO BE POSSIBLE...ESPECIALLY IN AFOREMENTIONED CORRIDOR. IF EVOLUTION TO ONE OR MORE FAST MOVING THUNDERSTORM COMPLEXES OCCURS...THEN THE THREAT WILL LIKELY EVOLVE TO WIDESPREAD HIGH END DAMAGING WINDS...WITH AN ISOLATED TORNADO AND HAIL THREAT. A VERY MOIST AIRMASS WILL REMAIN IN PLACE THROUGH TONIGHT...SO ANY INTENSE THUNDERSTORM WILL PRODUCE EXCESSIVE RAINFALL RATES AND THE POTENTIAL FOR RAPID FLASH FLOODING. HEAT INDEX VALUES ARE EXPECTED TO BE AROUND 105 DEGREES THIS AFTERNOON IN A CORRIDOR FROM KANKAKEE COUNTY TO LEE COUNTY AND POINTS SOUTH. PORTIONS OF THE ILLINOIS...IROQUOIS...VERMILLION AND KANKAKEE RIVERS...AND SUGAR CREEK ARE IN FLOOD....WITH RENEWED RISES POSSIBLE DUE TO ANY HEAVY RAIN TODAY AND TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE FOR THUNDERSTORMS ON TUESDAY AND THEN A PERIODIC CHANCE FOR THUNDERSTORMS THURSDAY THROUGH SUNDAY. PORTIONS OF THE ILLINOIS...IROQUOIS...VERMILLION AND KANKAKEE RIVERS...AND SUGAR CREEK WILL REMAIN IN FLOOD. .SPOTTER INFORMATION STATEMENT... SPOTTERS WILL BE NEEDED THROUGH TONIGHT. && LMZ740>745-141000- WINTHROP HARBOR TO WILMETTE HARBOR- WILMETTE HARBOR TO NORTHERLY ISLAND- NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY- 454 AM CDT MON JUL 13 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS PRODUCING WIND GUSTS IN EXCESS OF 50 KT...LARGE HAIL AND FREQUENT LIGHTNING ARE POSSIBLE THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE FOR THUNDERSTORMS ON TUESDAY AND THEN A PERIODIC CHANCE FOR THUNDERSTORMS THURSDAY THROUGH SUNDAY. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-141000- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 454 AM CDT MON JUL 13 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT. THUNDERSTORMS PRODUCING WIND GUSTS IN EXCESS OF 50 KT...LARGE HAIL AND FREQUENT LIGHTNING ARE POSSIBLE THROUGH TONIGHT FOR THE SOUTHERN PORTION OF THE LAKE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE IS A CHANCE FOR THUNDERSTORMS ON TUESDAY AND THEN A PERIODIC CHANCE FOR THUNDERSTORMS THURSDAY THROUGH SUNDAY. && RC VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE) FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT: WWW.FACEBOOK.COM/NWSCHICAGO WWW.TWITTER.COM/NWSCHICAGO WWW.YOUTUBE.COM/NWSCHICAGO
In the hours before
Local storm report, Jul 13, 7:00 AM CDT, 1 hour 17 minutes before
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</html>Special weather statement, Jul 13, 7:19 AM CDT, 58 minutes before
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</html>Local storm report, Jul 13, 7:29 AM CDT, 48 minutes before
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</html>Local storm report, Jul 13, 7:40 AM CDT, 37 minutes before
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</html>Special weather statement, Jul 13, 7:47 AM CDT, 30 minutes before
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</html>Local storm report, Jul 13, 8:11 AM CDT, 6 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 7:57 PM CDT | Areal Flood Warning | LOT | Ford, Iroquois, Livingston | 18 hr |
| Jul 12, 8:39 PM CDT | River Flood Warning | LOT | Grundy, Will | 3 days |
| Jul 13, 4:18 AM CDT | Heat Advisory | LOT | Ford, Grundy, Iroquois, Kankakee, LaSalle, Lee and 1 more | 15 hr |
| Jul 13, 4:34 AM CDT | Special Marine Warning | LOT | 116 min | |
| Jul 13, 5:05 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 55 min |
| Jul 13, 5:37 AM CDT | Severe Thunderstorm Warning | LOT | Lake | 38 min |
| Jul 13, 5:41 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Cook, DeKalb, DuPage, Kane, Lake and 3 more | 64 min |
| Jul 13, 6:05 AM CDT | Special Marine Warning | LOT | 115 min | |
| Jul 13, 6:08 AM CDT | Special Weather Statement | LOT | Lee | 52 min |
| Jul 13, 6:22 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DeKalb, DuPage, Kane, Kendall, Will | 53 min |
| Jul 13, 6:28 AM CDT | Areal Flood Advisory | LOT | Boone, Cook, DeKalb, DuPage, Kane, Lake and 4 more | 4 hr |
| Jul 13, 6:55 AM CDT | Special Weather Statement | LOT | Kendall, Will | 50 min |
| Jul 13, 7:19 AM CDT | Special Weather Statement | LOT | Grundy, Kankakee | 41 min |
| Jul 13, 7:47 AM CDT | Special Weather Statement | LOT | Kankakee | 43 min |
| Jul 13, 7:55 AM CDT | Areal Flood Advisory | LOT | Cook, DeKalb, Ford, Grundy, Iroquois, Kankakee and 5 more | 6 hr |
| Jul 13, 8:46 AM CDT | Special Weather Statement | LOT | Ford, Iroquois | 59 min |
| Jul 13, 9:53 AM CDT | River Flood Advisory | LOT | Kankakee | 4 days |
| Jul 13, 12:07 PM CDT | River Flood Warning | LOT | Grundy | 67 hr |
| Jul 13, 12:07 PM CDT | River Flood Warning | LOT | LaSalle | 3 days |
| Jul 13, 1:09 PM CDT | Areal Flood Warning | LOT | Ford, Iroquois, Livingston | 6 hr |
| Jul 13, 4:59 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 61 min |
| Jul 13, 5:37 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, LaSalle, Livingston | 53 min |
| Jul 13, 6:03 PM CDT | Areal Flood Advisory | LOT | Grundy, LaSalle | 4 hr |
| Jul 13, 6:29 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Kankakee, Livingston | 61 min |
| Jul 13, 6:38 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 52 min |
| Jul 13, 6:40 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 35 min |
| Jul 13, 9:28 AM CDT | River Flood Warning | LOT | Jasper | 4 days |
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.