Alert archive / Illinois / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 55, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 19, 2009, 6:38 PM CDT for 6 counties in Illinois. It was in force for 67 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
- Jun 19, 2009, 6:38 PM CDT (23:38 UTC)
- Expired
- Jun 19, 2009, 7:45 PM CDT
- In force
- 67 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
Counties DeKalb County, IL, Grundy County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 56 km from the middle of the area, began a volume at 23:40 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 |
|---|---|---|---|
| Jun 19, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.6 hours before the alert went out and 146 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
- 2125 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 982 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 0.8
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 Jun 19, 6:28 PM CDT, 10 minutes earlier.
Area forecast discussion, Jun 19, 6:28 PM CDT, 10 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 345 PM CDT FRI JUN 19 2009 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 202045- 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- 345 PM CDT FRI JUN 19 2009 /445 PM EDT FRI JUN 19 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...WHICH MAY PRODUCE: DAMAGING WINDS IN EXCESS OF 70 MPH. HEAVY RAIN WHICH COULD CAUSE FLASH FLOODING. LIGHTNING. HAIL TO 1 1/2 INCHES IN DIAMETER IS ALSO POSSIBLE. ISOLATED TORNADOES. AREAS AFFECTED AND TIMING: NORTHERN ILLINOIS AND NORTHWEST INDIANA THROUGH MIDNIGHT. DISCUSSION: ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE EARLY THIS EVENING AS A STRONG UPPER LEVEL DISTURBANCE APPROACHES FROM THE WEST. THE COMBINATION OF MODERATE INSTABILITY AND STRONG WIND SHEAR WILL RESULT IN A THREAT OF SEVERE WEATHER THROUGH AROUND MIDNIGHT. THE MAIN THREATS ARE LARGE HAIL AND DAMAGING WINDS BUT AN ISOLATED TORNADO IS POSSIBLE. IN ADDITION TO THE THREAT OF SEVERE WEATHER...VERY HEAVY RAINFALL IS POSSIBLE THAT MAY LEAD TO FLOODING AND FLASH FLOODING. A COLD FRONT WILL BE TRACKING EASTWARD ACROSS NORTHERN ILLINOIS TOWARD MIDNIGHT WHICH SHOULD END THE THREAT OF SEVERE WEATHER. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THERE IS A SLIGHT CHANCE OF A THUNDERSTORMS SUNDAY AND SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS WILL BE NEEDED THIS EVENING. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-202045- 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- 345 PM CDT FRI JUN 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THUNDERSTORMS ARE LIKELY THROUGH THIS EVENING. SOME STORMS MAY PRODUCE WIND GUSTS OVER 34 KNOTS...LARGE HAIL...AND DANGEROUS LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. && 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- 870-872-874-876-878-202045- 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 TOW 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- 345 PM CDT FRI JUN 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. THUNDERSTORMS ARE LIKELY THROUGH THIS EVENING. SOME STORMS MAY PRODUCE WIND GUSTS OVER 34 KNOTS...LARGE HAIL...AND DANGEROUS LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO MARSILI
In the hours before
Local storm report, Jun 19, 6:23 PM CDT, 15 minutes before
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</html>Local storm report, Jun 19, 6:37 PM CDT, 1 minute 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 |
|---|---|---|---|---|
| Jun 19, 1:13 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Jun 19, 1:27 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Lake, McHenry, Winnebago | 63 min |
| Jun 19, 2:02 AM CDT | Special Marine Warning | LOT | 118 min | |
| Jun 19, 4:42 AM CDT | Special Marine Warning | LOT | 77 min | |
| Jun 19, 4:48 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 24 min |
| Jun 19, 7:49 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 45 min |
| Jun 19, 8:01 AM CDT | Special Marine Warning | LOT | 89 min | |
| Jun 19, 8:31 AM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry | 47 min |
| Jun 19, 8:55 AM CDT | Tornado Warning | LOT | Kane, McHenry | 22 min |
| Jun 19, 9:17 AM CDT | Flash Flood Warning | LOT | Boone, DeKalb, Kane, McHenry, Ogle, Winnebago | 4 hr |
| Jun 19, 9:31 AM CDT | Special Marine Warning | LOT | 119 min | |
| Jun 19, 9:35 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 70 min |
| Jun 19, 9:46 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 29 min |
| Jun 19, 10:01 AM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 42 min |
| Jun 19, 10:03 AM CDT | Flash Flood Warning | LOT | Cook, DuPage, Lake | 4 hr |
| Jun 19, 10:04 AM CDT | River Flood Warning | LOT | Lake | 9 days |
| Jun 19, 10:10 AM CDT | River Flood Advisory | LOT | Cook | 2 hr |
| Jun 19, 10:12 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee, Ogle | 63 min |
| Jun 19, 10:28 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 47 min |
| Jun 19, 10:57 AM CDT | Special Marine Warning | LOT | 115 min | |
| Jun 19, 11:07 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane, Lake, McHenry | 53 min |
| Jun 19, 11:23 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DeKalb, DuPage, Kane | 67 min |
| Jun 19, 11:29 AM CDT | Special Marine Warning | LOT | 80 min | |
| Jun 19, 12:25 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 50 min |
| Jun 19, 12:27 PM CDT | River Flood Warning | LOT | Cook | 8 days |
| Jun 19, 1:08 PM CDT | Flash Flood Watch | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 8 hr |
| Jun 19, 2:13 PM CDT | River Flood Warning | LOT | Cook | 53 hr |
| Jun 19, 2:41 PM CDT | Special Marine Warning | LOT | 53 min | |
| Jun 19, 4:35 PM CDT | River Flood Advisory | LOT | Boone | 4 days |
| Jun 19, 5:36 PM CDT | Flash Flood Warning | LOT | Boone, DeKalb, Lee, Ogle, Winnebago | 6 hr |
| Jun 19, 5:46 PM CDT | Tornado Warning | LOT | Boone | 29 min |
| Jun 19, 5:49 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Ford, Grundy, Kane, Kendall, LaSalle and 2 more | 41 min |
| Jun 19, 6:00 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Lake, McHenry | 6 hr |
| Jun 19, 6:00 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 32 min |
| Jun 19, 6:03 PM CDT | Special Marine Warning | LOT | 87 min | |
| Jun 19, 6:05 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 55 min |
| Jun 19, 6:12 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Lee, Ogle, Winnebago | 63 min |
| Jun 19, 6:16 PM CDT | Tornado Warning | LOT | Ford, Iroquois | 35 min |
| Jun 19, 6:23 PM CDT | Special Marine Warning | LOT | 112 min | |
| Jun 19, 6:23 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more | 52 min |
| Jun 19, 6:28 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Lake, McHenry | 29 min |
| Jun 19, 6:56 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Iroquois, Kankakee, Will | 94 min |
| Jun 19, 6:56 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Cook, DeKalb, DuPage, Kane, Lake and 1 more | 43 min |
| Jun 19, 2:51 AM CDT | Severe Thunderstorm Warning | LOT | Lake, Porter | 69 min |
| Jun 19, 3:08 PM CDT | Severe Thunderstorm Warning | LOT | Benton | 12 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2009Every severe thunderstorm warning in 2009
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.