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March 11-12th Winter Storm


Chicago Storm

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All the models seem to be indicating good ratios. NAM looks like about 0.60-0.65" QPF but the snowmaps bring the foot mark right up to Toronto.

Yep. Will take a look at some BUFKIT profiles when they become available. Instantwx's kuchero method showing ~12" amounts is probably indicative of those high omega values intersecting the DGZ. 

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Not sure if it was posted, but DTX highlighted the potential in their AFD a little bit ago:

THE FORECAST FOR TUESDAY NIGHT AND WEDNESDAY IS THEN CONTINGENT ON
THE PHASING OF NORTHERN STREAM TROUGH/UPPER WAVE COMING OUT OF
CENTRAL CANADA AND THE TROUGH/WAVE OFF THE PACIFIC NORTHWEST COAST.
12Z MODELS ALL CONVERGING ON A RAPIDLY DEEPENING LOW TRACKING ALONG
OR CLOSE TO THE OHIO RIVER TO JUST SOUTH OF PITTSBURGH...A FAVORABLE
TRACK FOR SNOW NEAR THE MICHIGAN/OHIO BORDER. THE TEMP
GRADIENT/BAROCLINIC ZONE IS IMPRESSIVE...WITH SURGE OF ARCTIC AIR
UNDER THE LOW LEVEL NORTH-NORTHEAST FLOW DURING WEDNESDAY...AS
925/850 MB TEMPS CRASH INTO THE NEGATIVE MID TEENS. 850-700 MB
SPECIFIC HUMIDITY TUESDAY NIGHT BETWEEN 3-3.5 G/KG ALONG AND SOUTH
OF M-59 CORRIDOR...AND WITH INTENSE LIFT/DEFORMATION/FGEN FOR 6
HOURS...A SWATH OF 6 INCHES OF SNOW IS POSSIBLE NEAR THE OHIO
BORDER...BEFORE THE LOW RACES TO THE EAST COAST LATE WEDNESDAY.

ANOTHER FACTOR IS THE LEAD 500 MB LOW CURRENTLY OVER MEXICO...AND IF
AND WHEN IT BECOMES ABSORBED WITHIN THE DEVELOPING STORM SYSTEM...AS
THIS FEATURE WILL LIKELY TAKE WITH IT MUCH OF THE GULF OF MEXICO
MOISTURE. 12Z CANADIAN/UKMET BOTH SUGGEST BULK OF ACTIVITY WILL MISS
US JUST TO THE SOUTH. THE 12Z EURO CAME IN WITH A TRACK JUST SOUTH
OF THE OHIO RIVER...AND RIGHT KNOW THINKING AROUND 1 INCH BETWEEN
M-59/I-69 CORRIDORS...WITH AROUND 4 INCHES TOWARD THE OHIO BORDER.
THIS IS A SENSITIVE FORECAST DUE TO THE TIMING ISSUES WITH THE DRY
ARCTIC AIR FUNNELING INTO THE CENTRAL GREAT LAKES...AND WITH LAKE
HURON MOSTLY ICED OVER...CAN`T COUNT ON MUCH LAKE EFFECT
CONTRIBUTION/MOISTENING OF THE LOW LEVELS...AND THUS CONFIDENCE IS
AVERAGE AT BEST THIS FAR OUT.

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