Alert archive / Indiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 99, NWS Chicago, IL

June 15, 2008Iroquois County, Illinois; Benton County, Jasper County, Newton County, Indiana

NWS Chicago, IL issued this severe thunderstorm warning at Jun 15, 2008, 4:46 PM CDT for Iroquois County, Illinois; Benton County, Jasper County, Newton County, Indiana. It was in force for 40 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, 2008, 4:46 PM CDT (21:46 UTC)
Expired
Jun 15, 2008, 5:26 PM CDT
In force
40 min
Issued by
NWS Chicago, IL
Area
Storm-based polygon

Counties Iroquois County, IL, Benton County, IN, Jasper County, IN, Newton County, IN

The radar

The Chicago radar (KLOT), 103 km from the middle of the area, began a volume at 22:04 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.

IssuedProductOfficeLasted
Jun 15, 11:42 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.8 hours before the alert went out and 126 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 2008-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 325 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2008-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
325 J/kg
Mixed-layer CIN
-194 J/kg
Mixed-layer LCL
1628 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.8

Open this sounding in Storm Lab

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, 3:05 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jun 15, 3:05 PM CDT, 1 hour 41 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
305 PM CDT SUN JUN 15 2008

.DISCUSSION...

305 PM...ABBREVIATED DISCUSSION WITH ONGOING CONVECTION AND
EQUIPMENT ISSUES. MAIN FOCUS THIS AFTERNOON REMAINS CONVECTION
THROUGH TONIGHT. THUNDERSTORMS OVER WESTERN IL HAVE CONTINUED TO
BUILD NORTHWEST ACROSS NORTHEAST IL OVER THE PAST HR OR SO...ALONG
A TONGUE OF HIGHER MOISTURE AND INCREASING DEWPOINTS. HAVE EXPANDED
SVR WATCH 540 TO INCLUDE THE CHICAGO METRO AREA AND NORTHWEST
INDIANA AHEAD OF THIS LINE. INDIVIDUAL CELLS TO START SHOULD
EVENTUALLY EVOLVE INTO A LINE OF THUNDERSTORMS AS THEY SHIFT EAST
ACROSS THE CWA. WILL CONTINUE WITH LIKELY POPS THIS EVENING WITH
MENTION OF SVR THEN CHANCE ACROSS THE SOUTHEAST TONIGHT.

LITTLE CHANGE TO REMAINDER OF THE FORECAST. NORTHWEST FLOW WILL
ALLOW FOR A MAINLY DRY EARLY/MID WEEK WITH COOLER TEMPS...ONLY IN
THE 70S THROUGH MID WEEK. ANY PRECIP EXPECTED TO REMAIN NORTH OF
THE AREA MONDAY NIGHT AND TUESDAY. CMS

&&

.AVIATION...
114 PM CDT

18Z TAFORS...LARGE BOWING LN OF TSRA FM FAR SE IA SW TO NE KS
PUSHING SEWRD. GREATEST DEVELOPMENT ALONG WESTERN END IN NE KS AND
FAR SE NEB BUT WITH DEW POINTS IN THE UPPER 60S AND LOWER 70S
FEEDING NEWRD ACROSS THE MS RIVER INTO W CENTRAL AND NW IL UNDER
STEEP MID LVL LAPSE RATES AREA FM SE AND NW IL S ACROSS NE MO AND
W CENTRAL IL DESTABILIZING AS SFC TEMPS CLIMB INTO THE LOWER AND
MID 80S WITH HEATING. WITH SB LI OF -7 TO -9 AND SB CAPE OF 2500 TO
3000
EXPECT SOME CELLS TO GET GOING IN THIS AREA OF MAX INSTABILITY AS
SHORT WAVE TROF SEEN IN BACKING/VEERING SIGNATURE IN MID LVL WINDS
FM SLATER IA MOVS E ACROSS THE MS RIVER. TSRA SHUD MOVE QUICKLY
E-ESE AND OUT OF IMMEDIATE AREA LEAVING STABILIZED AIR IN PLACE
FOR LATE AFTERNOON AND THIS EVE AHEAD OF CDFNT CURRENTLY RUNNING
FM NE WI SWWRD ACROSS EXTREME SE MN AND N CENTRAL AND WESTERN IA.
THIS BOUNDARY EXPECTED TO PASS ACROSS THE TERMINALS LATE
EVE/OVERNIGHT WITH NIL CHC OF PCPN.

TRS

&&

.MARINE...
225 PM CDT

COLD FRONT FROM EASTERN LK SUPERIOR SOUTHWESTWARD INTO IA WILL
CONTINUE TO PUSH E AND ACROSS LK MI TONIGHT. HIGH PRES THEN SLOWLY
BUILDS ACROSS THE NORTHERN AND CENTRAL PLAINS MON AND TUE...AND
EVENTUALLY ACROSS THE MID MS AND LOWER OH VALLEYS MID WEEK.

TRS

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.

&&
Hazardous weather outlook, Jun 15, 4:30 PM CDT, 16 minutes before
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In the hours before

Local storm report, Jun 15, 4:18 PM CDT, 28 minutes before
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Local storm report, Jun 15, 4:33 PM CDT, 13 minutes before
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Local storm report, Jun 15, 4:34 PM CDT, 12 minutes before
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Local storm report, Jun 15, 4:40 PM CDT, 6 minutes before
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Local storm report, Jun 15, 4:45 PM CDT, 1 minute before
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Local storm report, Jun 15, 4:46 PM CDT, 0 minutes before
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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 15, 6:25 AM CDTSevere Thunderstorm WarningLOTDeKalb, Kane, Lee, Ogle50 min
Jun 15, 6:32 AM CDTSpecial Marine WarningLOT118 min
Jun 15, 6:49 AM CDTSevere Thunderstorm WarningLOTDeKalb, Kane, Kendall, LaSalle, Lee41 min
Jun 15, 7:00 AM CDTSevere Thunderstorm WarningLOTCook, DuPage, Will60 min
Jun 15, 8:34 AM CDTSpecial Marine WarningLOT51 min
Jun 15, 9:21 AM CDTRiver Flood AdvisoryLOTCook18 hr
Jun 15, 2:23 PM CDTSevere Thunderstorm WarningLOTLaSalle67 min
Jun 15, 2:51 PM CDTSevere Thunderstorm WarningLOTDeKalb, DuPage, Kane, Kendall, LaSalle, Will39 min
Jun 15, 3:01 PM CDTSevere Thunderstorm WarningLOTLaSalle, Livingston59 min
Jun 15, 3:17 PM CDTFlash Flood WarningLOTLaSalle3 hr
Jun 15, 3:23 PM CDTSevere Thunderstorm WarningLOTCook, Grundy, Kendall, Will50 min
Jun 15, 3:26 PM CDTSevere Thunderstorm WarningLOTKankakee, Will64 min
Jun 15, 3:51 PM CDTAreal Flood AdvisoryLOTKankakee, Will3 hr
Jun 15, 4:15 PM CDTAreal Flood AdvisoryLOTKankakee, Will3 hr
Jun 15, 4:32 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston46 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2008Severe Thunderstorm Warnings in Illinois, 2008Every severe thunderstorm warning in 2008

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.