Alert archive / Illinois / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 4, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Apr 17, 2013, 10:07 AM CDT for 6 counties in Illinois. It was in force for 53 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
- Apr 17, 2013, 10:07 AM CDT (15:07 UTC)
- Expired
- Apr 17, 2013, 11:00 AM CDT
- In force
- 53 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Boone County, IL, DeKalb County, IL, Kane County, IL, Lee County, IL, Ogle County, IL, Winnebago County, IL
The radar
The Chicago radar (KLOT), 88 km from the middle of the area, began a volume at 15:10 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 |
|---|---|---|---|
| Apr 17, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | 10 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 3.1 hours before the alert went out and 213 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
- 540 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 299 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.8
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 Apr 17, 8:55 AM CDT, 1 hour 12 minutes earlier.
Area forecast discussion, Apr 17, 8:55 AM CDT, 1 hour 12 minutes before
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</html>Hazardous weather outlook, Apr 17, 4:58 AM CDT, 5 hours 9 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 458 AM CDT WED APR 17 2013 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 181000- 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- 458 AM CDT WED APR 17 2013 /558 AM EDT WED APR 17 2013/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TODAY AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...A FEW MAY PRODUCE: HAIL TO ONE INCH. STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH. HEAVY RAINFALL. ISOLATED TORNADOES. AREAS AFFECTED AND TIMING: THUNDERSTORMS ARE EXPECTED TO STEADILY DEVELOP ACROSS EASTERN IOWA THIS MORNING AND SPREAD EAST ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA...AS COVERAGE OF THUNDERSTORMS INCREASES. THUNDERSTORMS ARE EXPECTED TO CONTINUE THROUGH TONIGHT. THE POTENTIAL FOR SEVERE THUNDERSTORMS WILL BE ACROSS ALL OF THE OUTLOOK AREA OF NORTHERN ILLINOIS AND NORTHWEST INDIANA THROUGH TONIGHT. DISCUSSION: A WARM FRONTAL BOUNDARY IS EXPECTED TO LIFT NORTH ACROSS THE AREA THIS AFTERNOON...WITH AN ANOMALOUSLY WARM AND MOIST AIRMASS TO THE SOUTH OF THIS BOUNDARY. THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG THIS WARM FRONT AND CONTINUE TO RIDE ALONG THIS BOUNDARY THROUGH TONIGHT. THUNDERSTORMS MAY BECOME SEVERE THIS AFTERNOON THROUGH TONIGHT AS THE INSTABILITY CONTINUES TO INCREASE THROUGHOUT THE DAY...MAINLY FOR AREAS ALONG AND SOUTH OF INTERSTATE 80. AT THIS TIME THE GREATEST HAZARDS FROM THUNDERSTORMS WILL BE DAMAGING WIND GUSTS AND HAIL TO ONE INCH IN DIAMETER...ALONG WITH HEAVY RAINFALL. IN ADDITION...SOME OF THE STRONGER THUNDERSTORMS MAY BEGIN TO ROTATE ALONG OR JUST NORTH OF THE WARM FRONTAL BOUNDARY. THUS THE POTENTIAL FOR AN ISOLATED TORNADO MAY OCCUR THIS AFTERNOON INTO TONIGHT. THUNDERSTORMS ARE EXPECTED TO TRAIN ACROSS THE SAME LOCATIONS THIS EVENING INTO THE OVERNIGHT...WHICH MAY LEAD TO FLOODING. WITH SATURATED SOILS ALREADY...ANY HEAVY RAINFALL WILL FURTHER EXACERBATE THE CURRENT FLOODING CONDITIONS. PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR ABOVE FLOOD STAGE DUE TO RECENT RAINFALL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. SEVERAL ROUNDS OF HEAVY RAIN PRODUCING THUNDERSTORMS WILL CONTINUE THROUGH THURSDAY. THIS MAY LEAD TO SIGNIFICANT FLOODING ON AREA RIVERS...SOME OF WHICH ARE ALREADY NEAR OR ABOVE FLOOD STAGE FROM PREVIOUS RAINFALL. LOCALLY HEAVY RAINFALL MAY ALSO LIKELY RESULT IN FLOODING OF LOW LYING AND URBAN AREAS. PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR ABOVE FLOOD STAGE DUE TO RECENT RAINFALL. .SPOTTER INFORMATION STATEMENT... SPOTTERS MAY BE NEEDED THIS AFTERNOON THROUGH TONIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-181000- 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- 458 AM CDT WED APR 17 2013 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. PERIODIC THUNDERSTORMS ARE LIKELY THIS AFTERNOON THROUGH TONIGHT. A FEW THUNDERSTORMS COULD BE STRONG AND PRODUCE GUSTY WINDS. GALE FORCE WINDS ARE POSSIBLE LATE TONIGHT THROUGH THE OVERNIGHT FROM CHICAGO TO MICHIGAN CITY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. PERIODIC THUNDERSTORMS ARE LIKELY THURSDAY. GALE FORCE WINDS ARE POSSIBLE FRIDAY THROUGH FRIDAY NIGHT FOR THE ENTIRE NEARSHORE WATERS OF ILLINOIS AND NORTHWEST INDIANA. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-181000- 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- 458 AM CDT WED APR 17 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TODAY AND TONIGHT. PERIODIC THUNDERSTORMS ARE LIKELY THIS AFTERNOON THROUGH TONIGHT FOR THE SOUTHERN HALF OF LAKE MICHIGAN. A FEW THUNDERSTORMS COULD BE STRONG AND PRODUCE GUSTY WINDS. OCCASIONAL GALE FORCE GUSTS MAY OCCUR THIS EVENING THROUGH TONIGHT MAINLY FOR THE SOUTHERN TIP OF LAKE MICHIGAN. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. PERIODIC THUNDERSTORMS ARE LIKELY THURSDAY. GALE FORCE WINDS ARE POSSIBLE FRIDAY THROUGH FRIDAY NIGHT. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO BEACHLER
In the hours before
Local storm report, Apr 17, 9:48 AM CDT, 19 minutes before
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</html>Local storm report, Apr 17, 9:51 AM CDT, 16 minutes before
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</html>Local storm report, Apr 17, 9:54 AM CDT, 13 minutes before
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</html>Local storm report, Apr 17, 10:00 AM CDT, 7 minutes before
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</html>Local storm report, Apr 17, 10:01 AM CDT, 6 minutes before
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</html>Local storm report, Apr 17, 10:03 AM CDT, 4 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 |
|---|---|---|---|---|
| Apr 16, 7:51 PM CDT | River Flood Warning | LOT | Winnebago | 16 days |
| Apr 17, 3:43 AM CDT | Gale Watch | LOT | 12 hr | |
| Apr 17, 8:19 AM CDT | Special Weather Statement | LOT | DeKalb | 56 min |
| Apr 17, 9:35 AM CDT | Special Weather Statement | LOT | Cook, DuPage | 55 min |
| Apr 17, 9:46 AM CDT | River Flood Watch | LOT | Ogle | 6 hr |
| Apr 17, 9:46 AM CDT | River Flood Watch | LOT | Lee | 6 hr |
| Apr 17, 9:46 AM CDT | River Flood Watch | LOT | Winnebago | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | Kane, Kendall | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | LaSalle | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | Lake | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | Cook | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | Cook | 6 hr |
| Apr 17, 10:49 AM CDT | River Flood Watch | LOT | Will | 6 hr |
| Apr 17, 11:07 AM CDT | Special Weather Statement | LOT | DeKalb, DuPage, Kane | 53 min |
| Apr 17, 11:17 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DeKalb, DuPage, Kane, Lake, McHenry | 58 min |
| Apr 17, 11:29 AM CDT | Special Marine Warning | LOT | 91 min | |
| Apr 17, 11:36 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee, Ogle, Winnebago | 54 min |
| Apr 17, 12:03 PM CDT | Flash Flood Warning | LOT | Cook, Kane, Lake, McHenry | 6 hr |
| Apr 17, 12:17 PM CDT | River Flood Warning | LOT | LaSalle | 10 days |
| Apr 17, 12:18 PM CDT | Flash Flood Warning | LOT | DeKalb, Lee, Ogle | 6 hr |
| Apr 17, 12:25 PM CDT | River Flood Advisory | LOT | Grundy | 10 hr |
| Apr 17, 12:53 PM CDT | Special Weather Statement | LOT | Ogle, Winnebago | 37 min |
| Apr 17, 12:58 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Lee, Ogle, Winnebago | 62 min |
| Apr 17, 1:18 PM CDT | Flash Flood Warning | LOT | Boone, Kane, Lake, McHenry, Winnebago | 5 hr |
| Apr 17, 1:27 PM CDT | Special Weather Statement | LOT | Cook, DeKalb, DuPage, Kane, Lake, McHenry | 63 min |
| Apr 17, 1:44 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Cook, DeKalb, Kane, Lake, McHenry and 1 more | 61 min |
| Apr 17, 2:11 PM CDT | Special Weather Statement | LOT | DeKalb, DuPage, Grundy, Kendall, LaSalle, Lee and 1 more | 64 min |
| Apr 17, 3:11 PM CDT | River Flood Warning | LOT | Cook | 61 hr |
| Apr 17, 3:14 PM CDT | Special Weather Statement | LOT | Cook, DuPage, Grundy, Kankakee, Livingston, Will | 31 min |
| Apr 17, 3:18 PM CDT | River Flood Advisory | LOT | Cook | 15 hr |
| Apr 17, 3:39 PM CDT | Special Weather Statement | LOT | Kendall, LaSalle | 66 min |
| Apr 17, 3:45 PM CDT | Special Weather Statement | LOT | Ford, Iroquois, Kankakee | 60 min |
| Apr 17, 3:58 PM CDT | River Flood Warning | LOT | Ogle | 9 days |
| Apr 17, 3:58 PM CDT | River Flood Warning | LOT | Lee | 6 days |
| Apr 17, 3:58 PM CDT | River Flood Warning | LOT | Winnebago | 5 days |
| Apr 17, 4:10 PM CDT | Gale Watch | LOT | 11 hr | |
| Apr 17, 4:10 PM CDT | Gale Warning | LOT | 17 hr | |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | Kane, Kendall | 17 days |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | LaSalle | 9 days |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | Lake | 10 days |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | Cook | 10 days |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | Cook | 9 days |
| Apr 17, 4:20 PM CDT | River Flood Warning | LOT | Will | 4 days |
| Apr 17, 4:35 PM CDT | Special Marine Warning | LOT | 40 min | |
| Apr 17, 4:46 PM CDT | Flash Flood Warning | LOT | Cook | 4 hr |
| Apr 17, 6:12 PM CDT | Areal Flood Warning | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 18 hr |
| Apr 17, 6:48 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 57 min |
| Apr 17, 3:18 PM CDT | River Flood Advisory | LOT | Lake | 5 hr |
| Apr 17, 4:35 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 25 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2013Every severe thunderstorm warning in 2013
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.