Wind Chill Advisory 7, NWS Quad Cities, IA

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
306 PM CST SAT DEC 11 2010

.SYNOPSIS...
MAJOR WINTER STORM IS RAPIDLY SHAPING UP OVER REGION TODAY.  SNOW
HAS BEGUN FOR A FAIRLY LARGE MAJORITY OF THE CWA...THOUGH A SECTION
ALONG I80 FROM THE QUAD CITIES EAST STILL HAS NOT SWITCHED TO
SNOW...BUT IS NOT VERY FAR FROM IT WITH TEMPERATURES IN THE MID 30S
AND THE COLD FRONT THROUGH ABOUT A MANCHESTER...TO MUSCATINE...TO
GALESBURG LINE AS OF 2 PM THIS AFTERNOON.  SURFACE LOW IS NOW
POSITIONED WEST OF WATERLOO...WITH A MINIMUM PRESSURE JUST UNDER
1000MB...STRONGER THAN NEARLY ALL THE MODELS SHOWED.  FROM SATELLITE
IMAGERY...500MB LOW IS NOW OVER CENTRAL IOWA...APPROACHING THE DES
MOINES AREA.  VERY HEAVY SNOW OCCURRING FROM EASTERN NEBRASKA AND
WESTERN IOWA...UP INTO SOUTHERN MINNESOTA AND WESTERN WISCONSIN.
WINDS OF 25 TO 35 MPH OVER WESTERN IOWA...EASTERN NEBRASKA...AND
SOUTHWEST MINNESOTA WITH GUSTS 45-55+...YIELDING BLIZZARD CONDITIONS
OVER THESE SAME AREAS.  BACK TO OUR AREA...WE ARE ABOUT TO GET DRY
SLOTTED-  THE WATER VAPOR IMAGERY IS SHOWING A VERY STRONG DRY SLOT
WRAPPING UP INTO IOWA FROM MISSOURI...AND THERE IS NO SNOW OR JUST
FLURRIES REPORTED ACROSS CENTRAL IOWA WHERE THE DRY SLOT IS...BEFORE
THE DEFORMATION ZONE SNOWS SET IN.

&&

.SHORT TERM...TONIGHT AND SUNDAY...
FORECAST FOCUS ON BLIZZARD WITH LIFE THREATENING CONDITIONS TONIGHT
AND SUNDAY. BLIZZARD WARNINGS IN EFFECT FOR THE ENTIRE DVN CWA.

POTENT SYSTEM COMING RIGHT ACROSS THE DVN CWA WITH IMPRESSIVE
RISE/FALL COUPLET. HIGH WINDS SHOULD COMMENCE LATER THIS EVENING IN
OUR WESTERN CWA AND SPREAD EASTWARD ACROSS THE ENTIRE CWA OVERNIGHT.
BAND OF SNOW SHOULD ANCHOR ALONG HIGHWAY 20 WITH DEFORMATION SNOW
NOW IN WESTERN IA SPREADING EASTWARD OVERNIGHT. EXPECT TOTAL
ACCUMULATIONS FROM THIS AFTERNOON THROUGH SUNDAY OF 6 TO 9 INCHES
ALONG HIGHWAY 20 TAPERING TO 3 TO 5 ALONG THE I-80 CORRIDOR TO
AROUND 3 INCHES IN OUR SOUTHERN CWA. WITH ARCTIC AIR RAPIDLY
OVERSPREADING THE CWA THIS WILL BE A DRY FLUFFY SNOW...EASILY BLOWN
AROUND CREATING BLIZZARD CONDITIONS WITH NEAR ZERO VISIBILITY IN
MANY AREAS. STORM SYSTEM WILL GRADUALLY MOVE EAST OF THE CWA WITH
WINDS SLOWLY RELAXING LATER IN THE AFTERNOON INTO SUNDAY EVENING.
MIN TEMPS SHOULD RANGE FROM THE SINGLE DIGITS NW TO THE TEENS SE.
MAX TEMPS ON SUNDAY WILL BE DROPPING DURING THE DAY REACHING NEAR
ZERO IN THE NW TO 10 TO 15 SE.

WIND SPEEDS...STRONGEST SPEEDS SHOULD OCCUR FROM ABOUT MIDNIGHT
TONIGHT TO ABOUT NOON SUNDAY. INCREDIBLE WINDS OF 60 TO 70 KNOTS AT
2-3K FT. EXPECT FREQUENT SURFACE GUSTS TO 50 MPH WITH AT LEAST 60
MPH GUSTS EXPECTED FOR A TIME DURING THE PEAK OF THE EVENT. HAHN
RULE WORKS REALLY WELL FOR GUSTS AND HAVE ALREADY SEEN THESE SPEEDS
AT KFSD THIS AFTERNOON. COMBINED WITH LIGHT TO MODERATE SNOW AND
ARCTIC AIR THIS WILL BE A LIFE THREATENING EVENT FOR ANYONE STRANDED.

.LONG TERM...SUNDAY NIGHT THROUGH NEXT SATURDAY...
WELL BELOW NORMAL TEMPERATURES THIS PERIOD WITH ANOTHER SHOT OF SNOW
ABOUT WEDNESDAY INTO THURSDAY. FOR NOW HAVE CHANCE POPS TO COVER
THIS BUT WILL WORRY ABOUT THAT SYSTEM LATER. COLDEST PERIOD FROM
SUNDAY NIGHT THROUGH TUESDAY WITH SOME MODERATION THEREAFTER. EXPECT
HEADLINES FOR WIND CHILLS FOR SUNDAY NIGHT INTO MONDAY WITH WIND
CHILLS AS LOW AS 20 TO 30 BELOW.

..HAASE..

&&

.AVIATION...
CURRENT BAND OF PRECIPITATION HAS WIDESPREAD IFR TO LIFR CIGS AND
VSBYS WITH A RAIN SNOW MIXTURE.  IT HAS ENDED ALREADY AT KBRL AND
KCID...AND SHOULD END FOR KMLI AROUND 4-5PM...AND KDBQ 5-6PM.  CIGS
AND VSBYS SHOULD LIFT TO MVFR FOR KBRL...KCID AND KMLI FOR SEVERAL
HOURS...AND MAY ALSO LIFT AT KDBQ FOR A SHORTER TIME FRAME.  SNOW
SHOULD SPREAD IN AGAIN FROM THE NORTHWEST...QUICKLY DROPPING
VISIBILITIES AND CEILINGS TO LIFR IN SNOW.  WINDS...WHICH HAVE BEEN
FLUCTUATING AROUND 10-15MPH WITH GUSTS TO NEAR 20 AS THEY GRADUALLY
SWITCH FROM SOUTH TO WEST...WILL INCREASE TONIGHT.  VERY STRONG
WINDS WILL SPREAD IN FROM THE WEST...WITH NORTH WINDS SUSTAINED AT
25-30KTS GUSTING OVER 40KTS BEGINNING AROUND MIDNIGHT...AND
AFFECTING ALL 4 TAF SITES BY 4 AM.  THESE WINDS WILL BLOW THE
FALLING AND FALLEN SNOW AROUND TO REDUCE VISIBILITIES TO LIFR
THROUGH THE DAY ON SUNDAY.   ..LE..

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...BLIZZARD WARNING FROM 9 PM THIS EVENING TO 6 PM CST SUNDAY FOR
     BENTON-BUCHANAN-CEDAR-CLINTON-DELAWARE-DES MOINES-DUBUQUE-
     HENRY IA-IOWA-JACKSON-JEFFERSON-JOHNSON-JONES-KEOKUK-LEE-
     LINN-LOUISA-MUSCATINE-SCOTT-VAN BUREN-WASHINGTON.

IL...BLIZZARD WARNING FROM 9 PM THIS EVENING TO 6 PM CST SUNDAY FOR
     JO DAVIESS-ROCK ISLAND.

     BLIZZARD WARNING FROM 3 AM TO 9 PM CST SUNDAY FOR BUREAU-CARROLL-
     HANCOCK-HENDERSON-HENRY IL-MCDONOUGH-MERCER-PUTNAM-
     STEPHENSON-WARREN-WHITESIDE.

MO...BLIZZARD WARNING FROM 9 PM THIS EVENING TO 6 PM CST SUNDAY FOR
     CLARK-SCOTLAND.

&&

HAASE/LE

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