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se WI/ne IL/nw IN/se MI lake effect snow event


Hoosier

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I think that's a really good forecast right now.

Theres a minor elevation increase when you reach western lake and eastern McHenry that can help squeeze out some decent snows in rare occasions when forcing can set up far enough west. FWIW this is a bit of a wishcast as my parents are out that way and i'll be out there this evening and possibly over night.

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milwaukee update

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI

1030 AM CST SAT DEC 25 2010

.UPDATE...

LAKE EFFECT SNOW BAND HAS SHIFTED ONSHORE...MAINLY SOUTH OF

DOWNTOWN MILWAUKEE. SOME WAVES IN THE BAND...BUT IT HAS BEEN

RELATIVELY STATIONARY IN THIS LOCATION SINCE 8AM. MODELS WOULD

HAVE MOVED THE BAND FARTHER WEST...AND THUS INLAND AS FAR NORTH AS

OZAUKEE COUNTY BY NOW. SEEING OFFSHORE WINDS AT SHEBOYGAN AND

MANITOWOC...SO LITTLE CONFIDENCE IN THE BAND SHIFTING INLAND

FARTHER NORTH BY EARLY THIS AFTERNOON. WOULD LIKELY BE LATER

AFTERNOON AND OVERNIGHT BEFORE WE SEE MUCH OF ANY SNOW FOR OZAUKEE

AND MILWAUKEE COUNTIES.

ONE CONCERN IN THIS THINKING IS FOR THE POTENTIAL OF A MESO LOW

DEVELOPING JUST OFFSHORE. HRRR MODEL HINTING AT THIS BUT CANT FIND

ANY EVIDENCE IN OBSERVATIONS OR SATELLITE YET.

NO CHANGES IN POTENTIAL ACCUMULATIONS AT THIS TIME. WILL HAVE TO

LET THE EVENT EVOLVE BEFORE WE CAN GET ANY DIFFERENT HANDLE ON

THAT.

ZABEL

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chicago aviation update

EXPECT THE SNOW TO BE SCATTERED AND NOT WELL ORGANIZED THROUGH

MID AFTERNOON. SNOW BAND SHOULD BECOME BETTER DEVELOPED BY MID TO

LATE AFTERNOON. USING BUFKIT THE BEST CLOUD DEPTH...6000-8000

FT...AND THUS TIME OF BEST SNOW PRODUCTION WILL BE FROM LATE

AFTERNOON THROUGH EARLY MORNING. THEREFORE HAVE INDICATED A

DETERIORATING TREND IN CIG/VSBY WITH BEST CHANCE OF IFR BEING

AFTER 00Z THROUGH ABOUT 08Z. THE OTHER QUESTION IS JUST WHERE THE

SNOW BAND WILL SET UP. MODEL GUIDANCE SUGGESTS THE BAND WILL BE

FROM MKE TO ORD BUT MODERATE TO HEAVY SNOW WILL LIKELY BE CONFINED

TO A NARROW BAND ABOUT 10 MILES WIDE. FLUCTUATIONS IN THIS BAND

FROM WEST TO EAST COULD SIGNIFICANTLY IMPACT FORECAST.

FORECAST TO LOWER LATE TONIGHT AND SUNDAY MORNING...RESULTING IN

SHALLOWER CLOUD DEPTH...WHICH SHOULD ALLOW LAKE EFFECT SNOW TO

DIMINISH IN INTENSITY BEFORE DAYBREAK. LOW LEVEL WINDS WILL THEN

SHIFT MORE NNW BY AFTERNOON ALLOWING LAKE EFFECT TO BE MAINLY OVER

NORTHERN INDIANA.

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I'll take another crack at this and say that the heaviest amounts end up between Waukegan and Chicago. Confidence about a 4 out of 10. The shape of the coast line makes it more difficult than a typical northwest IN event...a 10 mile eastward shift in the band could theoretically move it 30 miles farther down the shore in northeast IL.

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