Alert archive / Illinois / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 147, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at Dec 23, 2015, 9:25 AM CST for Ford County, Iroquois County, Livingston County, Illinois. It was in force for 50 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
- Dec 23, 2015, 9:25 AM CST (15:25 UTC)
- Expired
- Dec 23, 2015, 10:15 AM CST
- In force
- 50 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Ford County, IL, Iroquois County, IL, Livingston County, IL
The radar
The Chicago radar (KLOT), 96 km from the middle of the area, began a volume at 15:27 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
Lincoln, IL (KILX), launched 12:00Z, 3.4 hours before the alert went out and 74 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
- 12 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 260 m²/s²
- 0-3 km storm-relative helicity
- 212 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 Dec 23, 8:18 AM CST, 1 hour 7 minutes earlier.
Area forecast discussion, Dec 23, 8:18 AM CST, 1 hour 7 minutes before
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</html>Hazardous weather outlook, Dec 23, 4:08 AM CST, 5 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
408 AM CST WED DEC 23 2015
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
241015-
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-
408 AM CST WED DEC 23 2015 /508 AM EST WED DEC 23 2015/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...WHICH WILL PRODUCE...
DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
ISOLATED TORNADOES.
AREAS AFFECTED AND TIMING:
THUNDERSTORMS WILL DEVELOP MAINLY AFTER 2PM CST AND
CONTINUE THROUGH EARLY THIS EVENING ACROSS THE ENTIRE
OUTLOOK AREA.
DISCUSSION:
AN UNSEASONABLY WARM AND MOIST AIRMASS WILL LIFT NORTH
ACROSS THE FORECAST AREA TODAY AND BRING HIGH TEMPERATURES
IN THE 60S TO THE AREA WITH DEW POINTS IN THE MIDDLE TO
UPPER 50S. STRONG SHEAR WILL BE ASSOCIATED WITH THIS
STORM SYSTEM WITH STEEPENING LAPSE RATES AND STEADILY
INCREASING INSTABILITY...SUPPORTIVE OF A FEW SEVERE STORMS
THAT MAY PRODUCE DAMAGING WINDS. WITH THE POTENTIAL FOR WINDS
AT THE SURFACE TO BACK TO THE SOUTHEAST...INCREASED TURNING
IN THE LOW LEVEL WIND FIELDS MAY ALLOW FOR AN ISOLATED
TORNADO.
WINDY CONDITIONS WILL FOLLOW THE THUNDERSTORMS THIS
EVENING ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA.
WIND GUSTS BETWEEN 45 AND 50 MPH WILL BE POSSIBLE LATE THIS
EVENING THROUGH THE OVERNIGHT HOURS.
WATER LEVELS WILL REMAIN ELEVATED ON AREA STREAMS AND RIVERS...
MAINLY FOR PORTIONS OF THE FOX...ILLINOIS...DUPAGE...AND ROCK
RIVERS.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
WATER LEVELS WILL REMAIN ELEVATED ON AREA STREAMS AND RIVERS...
MAINLY FOR PORTIONS OF THE FOX...ILLINOIS...DUPAGE...AND ROCK
RIVERS.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS MAY BE NEEDED THIS AFTERNOON THROUGH THIS EVENING.
&&
LMZ740>745-241015-
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-
408 AM CST WED DEC 23 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.
STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT THROUGH THIS AFTERNOON...THEN GALE FORCE WINDS ARE
LIKELY TONIGHT.
THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON THROUGH THIS
EVENING. SOME OF THESE STORMS COULD BE SEVERE AND PRODUCE WINDS IN
EXCESS OF 40 KT.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
STRONG WINDS AND HIGH WAVES ARE POSSBLE THURSDAY MORNING.
STRONG WINDS AND HIGH WAVES WILL BE POSSIBLE SUNDAY
THROUGH MONDAY.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-241015-
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-
408 AM CST WED DEC 23 2015
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...TODAY AND TONIGHT.
GALE FORCE WINDS ARE LIKELY MAINLY FOR THE SOUTH HALF THIS
EVENING THROUGH TONIGHT...THEN STORM FORCE WINDS ARE LIKELY FOR
NORTH HALF AFTER MIDNIGHT TONIGHT.
THERE IS A CHANCE OF THUNDERSTORMS ON THIS AFTERNOON THROUGH
THIS EVENING...MAINLY FOR THE SOUTHERN HALF OF THE LAKE.
SOME OF THESE STORMS COULD BE SEVERE AND PRODUCE WINDS IN
EXCESS OF 40 KT.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
GALE FORCE WINDS ARE LIKELY FOR THE SOUTH HALF THROUGH
THURSDAY MORNING...AND STORM FORCE WINDS FOR THE NORTH HALF. THEN
GALES WILL LIKELY CONTINUE THROUGH THURSDAY AFTERNOON FOR THE
NORTH HALF.
&&
BEACHLER
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/NWSCHICAGOIn the hours before
Special weather statement, Dec 23, 3:57 AM CST, 5 hours 28 minutes before
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</html>Special weather statement, Dec 23, 9:18 AM CST, 7 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
918 AM CST WED DEC 23 2015
ILZ032-039-231600-
LIVINGSTON IL-FORD IL-
918 AM CST WED DEC 23 2015
...SPECIAL WEATHER STATEMENT FOR FORD AND LIVINGSTON COUNTIES UNTIL
1000 AM CST...
AT 917 AM CST...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR COOKSVILLE TO
MANSFIELD...AND MOVING NORTH AT 60 MPH.
WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
PONTIAC... PAXTON... FAIRBURY...
GIBSON CITY... PIPER CITY... FORREST...
CHATSWORTH... ODELL... CULLOM...
GIBSON... CORNELL... MELVIN...
SAUNEMIN... ROBERTS... ELLIOTT...
SIBLEY... KEMPTON... EMINGTON...
STRAWN...
INCLUDING THE FOLLOWING INTERSTATES...
I-55 BETWEEN MILE MARKERS 189 AND 210.
I-57 NEAR MILE MARKER 258.
LAT...LON 4062 8846 4062 8857 4076 8858 4076 8879
4108 8875 4093 8814 4040 8812 4040 8846
TIME...MOT...LOC 1517Z 199DEG 53KT 4051 8873 4021 8850
BMDThe office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 3:56 AM CST | Gale Warning | LOT | 29 hr | |
| Dec 23, 3:56 AM CST | Gale Warning | LOT | 35 hr | |
| Dec 23, 3:56 AM CST | Storm Warning | LOT | 29 hr | |
| Dec 23, 4:38 AM CST | Marine Dense Fog Advisory | LOT | 13 hr | |
| Dec 23, 9:18 AM CST | Special Weather Statement | LOT | Ford, Livingston | 42 min |
| Dec 23, 10:19 AM CST | River Flood Advisory | LOT | Kane, Kendall | 7 days |
| Dec 23, 10:19 AM CST | River Flood Advisory | LOT | LaSalle | 67 hr |
| Dec 23, 10:19 AM CST | River Flood Advisory | LOT | Will | 44 hr |
| Dec 23, 10:20 AM CST | Special Weather Statement | LOT | Ford | 40 min |
| Dec 23, 10:50 AM CST | Tornado Warning | LOT | Ford, Iroquois, Livingston | 25 min |
| Dec 23, 11:30 AM CST | Wind Advisory | LOT | Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more | 16 hr |
| Dec 23, 11:39 AM CST | Special Marine Warning | LOT | 96 min | |
| Dec 23, 12:03 PM CST | Gale Warning | LOT | 9 hr | |
| Dec 23, 12:03 PM CST | Gale Warning | LOT | 21 hr | |
| Dec 23, 11:37 AM CST | Special Weather Statement | LOT | Lake | 38 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.