Alert archive / Illinois / Winter Storm Warnings in 2008

Winter Storm Warning 6, NWS Quad Cities, IA

November 30, 20087 counties in Illinois

NWS Quad Cities, IA issued this winter storm warning at Nov 30, 2008, 4:17 AM CST for 7 counties in Illinois. It was in force for 16 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Nov 30, 2008, 4:17 AM CST (10:17 UTC)
Expired
Nov 30, 2008, 8:38 PM CST
In force
16 hr
Issued by
NWS Quad Cities, IA

Counties Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 10:18 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 10.3 hours before the alert went out and 330 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, Green Bay/Straub, WI at 00:00Z on 2008-11-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Green Bay/Straub, WI at 00:00Z on 2008-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1531 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this winter storm warning went out at Nov 30, 3:35 AM CST, 42 minutes earlier.

Area forecast discussion, Nov 30, 3:35 AM CST, 42 minutes before
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Hazardous weather outlook, Nov 29, 5:00 AM CST, 23 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 AM CST SAT NOV 29 2008

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-301100-
BENTON IA-BUCHANAN IA-BUREAU IL-CARROLL IL-CEDAR IA-CLARK MO-
CLINTON IA-DELAWARE IA-DES MOINES IA-DUBUQUE IA-HANCOCK IL-
HENDERSON IL-HENRY IA-HENRY IL-IOWA IA-JACKSON IA-JEFFERSON IA-
JO DAVIESS IL-JOHNSON IA-JONES IA-KEOKUK IA-LEE IA-LINN IA-LOUISA IA-
MCDONOUGH IL-MERCER IL-MUSCATINE IA-PUTNAM IL-ROCK ISLAND IL-
SCOTLAND MO-SCOTT IA-STEPHENSON IL-VAN BUREN IA-WARREN IL-
WASHINGTON IA-WHITESIDE IL-
500 AM CST SAT NOV 29 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT

AN UPPER LEVEL STORM SYSTEM WILL INTENSIFY WHILE IT DIVES SOUTH FROM
THE UPPER MIDWEST INTO THE OHIO VALLEY TODAY THROUGH SUNDAY. MAINLY
LIGHT RAIN WILL SPREAD UP ACROSS SOUTHEAST IOWA THIS AFTERNOON...AND
THEN PROGRESS NORTHEASTWARD ACROSS THE REST OF THE AREA SATURDAY
EVENING. COOLER AIR PUSHING INTO THE AREA WILL CAUSE THE RAIN TO MIX
WITH SNOW BY MID EVENING...AND THEN SWITCH OVER TO ALL SNOW BY
MIDNIGHT IN MOST AREAS. CURRENT INDICATIONS SUGGEST THAT AREAS ALONG
AND WEST OF A LINE FROM WILLIAMSBURG...TO MOUNT PLEASANT AND TO
CARTHAGE ILLINOIS MAY SEE AN INCH OF SNOWFALL BY DAYBREAK SUNDAY
MORNING. AREAS FURTHER TO THE EAST AND NORTHEAST ACROSS THE REST OF
THE OUTLOOK AREA WILL RECEIVE A DUSTING TO A HALF INCH. STILL MILD
GROUND CONDITIONS AND AIR TEMPERATURES HOVERING AROUND FREEZING OR
EVEN THE MID 30S TONIGHT...WILL CAUSE MUCH OF THE INITIAL SNOWFALL TO
MELT AND PRODUCE MAINLY WET ROADWAYS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SNOW WILL CONTINUE SUNDAY BEFORE TAPERING TO FLURRIES LATE SUNDAY
NIGHT. CURRENT INDICATIONS SUGGEST THAT ADDITIONAL SNOW ACCUMULATIONS
OF 1 TO 2 INCHES IS LIKELY OVER MUCH OF THE OUTLOOK AREA... WITH THE
POTENTIAL FOR BANDS OF LOCALLY HIGHER ACCUMULATIONS OF 3 TO 4 INCHES
SOUTHEAST OF A FAIRFIELD TO QUAD CITIES TO STERLING ROCK FALLS AXIS.
THE BULK OF THE SNOW ACCUMULATION WILL BE ON GRASSY AND ELEVATED
SURFACES DURING THE DAY ON SUNDAY... WITH ROADS MAINLY JUST WET WITH
GROUND AND AIR TEMPERATURES AT OR ABOVE FREEZING. HOWEVER... AS
TEMPERATURES DROP BELOW FREEZING SUNDAY NIGHT SOME ROADS MAY BECOME
SLICK AND SNOW COVERED.

ANOTHER STORM SYSTEM WILL BRING A CHANCE OF MORE SNOW TO THE OUTLOOK
AREA LATE TUESDAY NIGHT THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT...BUT THE
SNOWFALL OBSERVER NETWORK SHOULD BE ACTIVATED. SNOWFALL AMOUNTS
DURING AND AFTER THE EVENT WOULD BE GREATLY APPRECIATED.

12/05

In the hours before

Local storm report, Nov 29, 11:08 PM CST, 5 hours 9 minutes before
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Local storm report, Nov 30, 12:49 AM CST, 3 hours 28 minutes before
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Nearby

Winter Storm Warnings in Illinois, 2008Every winter storm 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.