Alert archive / Illinois / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 70, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Jun 15, 2015, 5:39 PM CDT for DeKalb County, LaSalle County, Illinois. It was in force for 21 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 15, 2015, 5:39 PM CDT (22:39 UTC)
- Expired
- Jun 15, 2015, 6:00 PM CDT
- In force
- 21 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties DeKalb County, IL, LaSalle County, IL
The radar
The Chicago radar (KLOT), 62 km from the middle of the area, began a volume at 22:43 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 139 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
- 280 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 15, 4:55 PM CDT, 44 minutes earlier.
Area forecast discussion, Jun 15, 4:55 PM CDT, 44 minutes before
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</html>Hazardous weather outlook, Jun 15, 3:39 PM CDT, 2 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 339 PM CDT MON JUN 15 2015 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 162045- 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- 339 PM CDT MON JUN 15 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME OF WHICH MAY PRODUCE: FREQUENT CLOUD TO GROUND LIGHTNING. VERY HEAVY RAINFALL AND FLASH FLOODING. ISOLATED WINDS GUSTS ABOVE 60 MPH. AREAS AFFECTED AND TIMING: SCATTERED THUNDERSTORMS WILL LIKELY GROW MORE NUMEROUS ACROSS THE OUTLOOK AREA THROUGH THIS EVENING. THE MAIN CONCENTRATION OF THUNDERSTORMS WILL GRADUALLY SHIFT SOUTH OVERNIGHT AND END NORTH OF INTERSTATE 80 DURING THE PRE-DAWN HOURS. DISCUSSION: THUNDERSTORMS WILL BECOME MORE NUMEROUS THROUGH THE EVENING AS A SLOW MOVING FRONT APPROACHES THE AREA. THE ATMOSPHERE IS EXTREMELY MOIST AND ANY STORMS THAT FORM WILL HAVE THE POTENTIAL TO PRODUCE TORRENTIAL DOWNPOURS...POTENTIALLY UPWARDS OF 2 INCHES IN AN HOUR OR LESS. IN ADDITION TO THE HEAVY RAIN...WHICH MAY RESULT IN LOCALIZED FLASH FLOODING...A COUPLE OF THE STORMS COULD PRODUCE LOCALIZED WIND GUSTS OVER 60 MPH. IN ADDITION...PORTIONS OF THE IROQUOIS...KANKAKEE...AND ILLINOIS RIVERS WILL REMAIN IN FLOOD. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS TUESDAY THROUGH THE WEEKEND. PORTIONS OF THE IROQUOIS...KANKAKEE...AND ILLINOIS RIVERS WILL REMAIN IN FLOOD. .SPOTTER INFORMATION STATEMENT... DUE TO THE ISOLATED NATURE OF THE SEVERE WEATHER THREAT...SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT...HOWEVER ANY OBSERVATIONS OF FLOODING OR MEASURED HEAVY RAIN TOTALS WOULD BE APPRECIATED. && LMZ740>745-162045- 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- 339 PM CDT MON JUN 15 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. PERIODS OF THUNDERSTORMS ARE EXPECTED THROUGH LATE TONIGHT. SOME OF THE STORMS MAY PRODUCE GUSTS UP TO 35 KNOTS. AREAS OF FOG ARE POSSIBLE THROUGH THIS EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE ARE PERIODIC CHANCES OF THUNDERSTORMS LATE TUESDAY NIGHT THROUGH THE WEEKEND. && LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-162045- 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- 339 PM CDT MON JUN 15 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...TONIGHT. PERIODS OF THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF THE LAKE THROUGH LATE TONIGHT. AREAS OF DENSE FOG ARE LIKELY INTO EARLY THIS EVENING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. THERE ARE PERIODIC CHANCES OF THUNDERSTORMS WEDNESDAY THROUGH THE WEEKEND. && KREIN 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
Special weather statement, Jun 15, 2:49 PM CDT, 2 hours 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
249 PM CDT MON JUN 15 2015
INZ011-152015-
JASPER IN-
249 PM CDT MON JUN 15 2015
...SPECIAL WEATHER STATEMENT FOR CENTRAL JASPER COUNTY UNTIL 315 PM
CDT...
AT 248 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GIFFORD...MOVING EAST AT 25 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.
THIS STRONG THUNDERSTORM WILL BE NEAR...
MOODY AROUND 300 PM CDT.
HANGING GROVE AND MCCOYSBURG AROUND 305 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
&&
LAT...LON 4091 8699 4088 8699 4096 8721 4113 8714
4110 8693 4091 8693
TIME...MOT...LOC 1948Z 291DEG 22KT 4103 8708
IZZILocal storm report, Jun 15, 3:42 PM CDT, 1 hour 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
342 PM CDT MON JUN 15 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0335 PM HEAVY RAIN 2 N RENSSELAER 40.96N 87.15W
06/15/2015 M0.90 INCH JASPER IN COCORAHS
RAINFALL IN 35 MINUTES.
&&
BNLocal storm report, Jun 15, 3:57 PM CDT, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
357 PM CDT MON JUN 15 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0345 PM HEAVY RAIN 6 E ASHKUM 40.88N 87.84W
06/15/2015 M2.07 INCH IROQUOIS IL COCORAHS
RAINFALL SINCE 6AM WITH 1.75 INCHES IN THE PAST 60
MINUTES.
&&
BNLocal storm report, Jun 15, 4:03 PM CDT, 1 hour 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
403 PM CDT MON JUN 15 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0352 PM TSTM WND GST 4 SSE FORESMAN 40.82N 87.26W
06/15/2015 M48.00 MPH JASPER IN TRAINED SPOTTER
&&
BBLocal storm report, Jun 15, 4:06 PM CDT, 1 hour 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
406 PM CDT MON JUN 15 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM FLOOD 1 N ROCHELLE 41.93N 89.06W
06/15/2015 OGLE IL TRAINED SPOTTER
WATER OVER CURBS...1-2 FEET DEEP OF STANDING WATER AT RT
38 AND TURKINGTON TERRACE
&&
BBLocal storm report, Jun 15, 5:17 PM CDT, 22 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 |
|---|---|---|---|---|
| Jun 14, 7:29 PM CDT | Areal Flood Advisory | LOT | Ford, Livingston | 4 hr |
| Jun 14, 8:40 PM CDT | River Flood Advisory | LOT | Iroquois | 3 days |
| Jun 15, 4:10 AM CDT | Flash Flood Watch | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 24 hr |
| Jun 15, 9:23 AM CDT | River Flood Advisory | LOT | Boone | 58 hr |
| Jun 15, 10:13 AM CDT | River Flood Advisory | LOT | Kane, McHenry | 45 hr |
| Jun 15, 10:13 AM CDT | River Flood Advisory | LOT | Kane, Kendall | 4 days |
| Jun 15, 10:13 AM CDT | River Flood Advisory | LOT | LaSalle | 62 hr |
| Jun 15, 10:32 AM CDT | Flash Flood Warning | LOT | Grundy, LaSalle | 6 hr |
| Jun 15, 10:47 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee | 26 min |
| Jun 15, 11:00 AM CDT | Flash Flood Warning | LOT | Kankakee, Will | 6 hr |
| Jun 15, 11:51 AM CDT | Special Weather Statement | LOT | DuPage | 24 min |
| Jun 15, 2:29 PM CDT | Areal Flood Advisory | LOT | Ford, Iroquois, Kankakee, Livingston | 2 hr |
| Jun 15, 3:08 PM CDT | Flash Flood Warning | LOT | Iroquois, Kankakee | 6 hr |
| Jun 15, 4:24 PM CDT | Flash Flood Warning | LOT | Cook, DeKalb, DuPage, Kane, Lee, Ogle | 6 hr |
| Jun 15, 4:41 PM CDT | Areal Flood Warning | LOT | Grundy, Kankakee, LaSalle, Will | 18 hr |
| Jun 15, 4:50 PM CDT | Tornado Warning | LOT | Cook | 25 min |
| Jun 15, 5:03 PM CDT | Special Marine Warning | LOT | 57 min | |
| Jun 15, 6:09 PM CDT | Flash Flood Warning | LOT | Cook, DeKalb, DuPage, Grundy, Kendall, LaSalle and 2 more | 4 hr |
| Jun 15, 6:28 PM CDT | River Flood Advisory | LOT | Cook | 25 hr |
| Jun 15, 6:32 PM CDT | Special Marine Warning | LOT | 118 min | |
| Jun 15, 11:19 AM CDT | Special Weather Statement | LOT | Lake | 26 min |
| Jun 15, 11:42 AM CDT | Areal Flood Advisory | LOT | Lake, Porter | 2 hr |
| Jun 15, 2:49 PM CDT | Special Weather Statement | LOT | Jasper | 26 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.