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January 31-February 2 Major Winter Storm part 3


Hoosier

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Hoosier sent you a pm.

BTW, Tom Skilling says a system that bears watching. Significant winter storm possible or close nearby. Mentions on one of models that by Monday night Neberaska and IA getting smoked. Yes Tony as always a system like this does

merit the potential of Lake effect enhancement. Systems like these is our biggest lake enhancement producers.

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Hoosier sent you a pm.

BTW, Tom Skilling says a system that bears watching. Significant winter storm possible or close nearby. Mentions on one of models that by Monday night Neberaska and IA getting smoked. Yes Tony as always a system like this does

merit the potential of Lake effect enhancement. Systems like these is our biggest lake enhancement producers.

Putting the cart before the horse here but lake temps are down to the mid upper 30s with a pretty good amount of near shore ice. Late January is typically the low point for lake enhancement because the fetch is shortened by ice and high delta Ts are harder to obtain. We’d probably see some added moisture but it wouldn’t be a ton.

Back to the storm, after looking at it a bit, the 12z GFS isn't as bad as i though and i think might be a little stingy on the QPF up this way based on the 700mb low. Really a ton to watch the next few days and plenty of time for significant swings each way.

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Putting the cart before the horse here but lake temps are down to the mid upper 30s with a pretty good amount of near shore ice. Late January is typically the low point for lake enhancement because the fetch is shortened by ice and high delta Ts are harder to obtain. We’d probably see some added moisture but it wouldn’t be a ton.

Back to the storm, after looking at it a bit, the 12z GFS isn't as bad as i though and i think might be a little stingy on the QPF up this way based on the 700mb low. Really a ton to watch the next few days and plenty of time for significant swings each way.

That is a downfall but I am sure it wont take much sypnotic snow to bring heavy accumulations. Hopefully will see a beauitful scenery Tuesday and a nice cool NE lake breeze.

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Putting the cart before the horse here but lake temps are down to the mid upper 30s with a pretty good amount of near shore ice. Late January is typically the low point for lake enhancement because the fetch is shortened by ice and high delta Ts are harder to obtain. We’d probably see some added moisture but it wouldn’t be a ton.

Back to the storm, after looking at it a bit, the 12z GFS isn't as bad as i though and i think might be a little stingy on the QPF up this way based on the 700mb low. Really a ton to watch the next few days and plenty of time for significant swings each way.

Yeah I agree...maybe some lake contribution but probably not a lot.

Also, since I see some bringing up possible ratios, don't forget to look at the whole column. Even if surface temps are cold, the ratios might not be as good as one would think if there's a lot of mid level warming occurring.

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HPC requesting a recon flight, hopefully in time for 0z Sunday run, per HPC.

Nice to hear.

I have a funny feeling this may end up being a full blow phase and northern stream gets better sampled later in the time period. I dont doubt a Indy to Detroit track in the end.

How am I not surprised.

Amazing that we're already on the third thread for a storm that's still at least 5 days out.

the action will probably slow somewhat as geographic contenders fall off the map when track is narrowed down more.

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Very interesting looking storm. The Euro would deliver a huge snow for this particular area. Nice to see something like this in the forecast again, even if it doesn't pan out. The endless parade of clippers has been mildly entertaining, but this type of storm system is what we all look forward to tracking.

My main concern at this point is with the amount of energy that hangs back behind the main lead wave. I think that may create some havoc with how the models handle this in coming runs.

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It is going to be a long weekend!

No football either.. Pro Bowl for some bears players :P

Looking like a nice saturday to enjoy the mini thaw.. Get out and enjoy the snow or w/e folks! Don't be like me today and fook up one of the nicest days to ice fish with friends over the stupid weather models.

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HPC going with a south of the OH River track keeping all snow north of the river. :thumbsup:

EXTENDED FORECAST DISCUSSION

NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD

136 PM EST FRI JAN 28 2011

VALID 12Z MON JAN 31 2011 - 12Z FRI FEB 04 2011

...MAJOR WINTER STORM SETTING UP NEXT WEEK FROM THE ROCKIES TO THE

NORTHEAST...

MEDIUM RANGE GUIDANCE IS AGREEABLE WITH THE LARGE SCALE SCENARIO

OF AN ELONGATED MEAN TROF EXTENDING FROM NERN CANADA SWWD INTO THE

SWRN CONUS... LIKELY WITH SOME SEPARATION BETWEEN SRN CANADA/NRN

TIER CONUS FLOW AND WRN/SRN CONUS FLOW. THIS TROF WILL BE

SUPPORTED BY A MEAN RIDGE THAT SHOULD PERSIST OVER THE ERN PAC/WRN

CANADA ALBEIT WITH SOME CHANGE IN SHAPE OVER TIME. WHILE A GOOD

CONSENSUS EXISTS WITH THE LARGE SCALE MEAN EVOLUTION... THERE IS

LOWER THAN AVERAGE CONFIDENCE IN DETAILS DUE TO THE SPLIT FLOW

NATURE OF THE NOAM PATTERN AND ADDITIONAL UNCERTAINTIES PRESENTED

BY ERN PAC ENERGY THAT MAY TRY TO PASS THRU THE MEAN RIDGE BY

MID-LATE WEEK.

THE MOST PROMINENT SFC SYSTEM FOR WHICH SHRTWV UNCERTAINTIES COME

INTO PLAY IS FCST TO TRACK NEWD FROM THE SRN PLAINS TUE ONWARD.

TO VARYING DEGREES THE 00Z GFS AND ECMWF HAVE MADE MEANINGFUL NWWD

ADJUSTMENTS FROM FAIRLY SUPPRESSED TRACKS IN MULTIPLE PREVIOUS

RUNS. THE ECMWF TREND IS MORE EXTREME AS ITS PREVIOUS TWO RUNS

WERE ON THE SERN SIDE OF THE ENVELOPE AND THE NEW 00Z RUN IS NOW

ON THE NWRN SIDE OF GUIDANCE. THE CANADIAN IS A FAST EXTREME TO

BRING SWRN CONUS ENERGY INTO THE PLAINS AND IS ALSO IN THE NWRN

PART OF THE SPREAD... WHILE THE UKMET TRACK IS NOT QUITE AS FAR

NWWD AS ITS PREVIOUS RUN. OVERALL PREFER A GEFS MEAN/12Z ECMWF

ENSEMBLE MEAN SOLN THAT FALLS IN THE MIDDLE OF LATEST AND RECENT

GUIDANCE GIVEN THE SENSITIVITY OF SHRTWV DETAILS AND SIGNIFICANT

RUN TO RUN CONTINUITY CHANGES.

BEHIND THIS SYSTEM... BY WED NIGHT-FRI THERE IS CONSIDERABLE

SPREAD REGARDING ENERGY THAT MAY TRY TO PASS THRU THE ERN PAC MEAN

RIDGE. THE 00Z ECMWF AND SLOWER 00Z GFS BOTH SEEM A LITTLE STRONG

SO THE ENSEMBLE MEAN BLEND USED FOR THE PLAINS/ERN CONUS SYSTEM

PROVIDES A MORE TOLERABLE SOLN AT THIS TIME. THE GEFS MEAN IS A

LITTLE EXTREME WITH ITS SLOWER TIMING/WWD ELONGATION OF THE TROF

SETTLING OVER THE SWRN CONUS SO INCLUSION OF THE ECMWF MEAN TONES

DOWN THIS ASPECT OF THE FCST.

WHILE DAYS 5-7 WED-FRI FOLLOW A BLEND OF THE GEFS/12Z ECMWF

MEANS... MISSING DATA DUE TO EARLIER COMMS ISSUES PRECLUDED USE OF

THE ECMWF MEAN FOR DAYS 3-4. THUS THE EARLIER PART OF THE FCST

STARTED WITH A BLEND OF GFS/ECMWF/GEFS MEAN SOLNS TO ARRIVE AT AN

ACCEPTABLE COMPROMISE.

UPDATED MORNING PRELIMS USE A MULTIMODEL BLEND OF 00Z

GFS/ECMWF/CMC/UKMET/GFS ENS MEAN. THE RESULT IS NEARLY IDENTICAL

TO THE EARLIER USED SOLUTION.

12Z MODEL GUIDANCE FOLLOWS CONTINUITY AND A COMPOSITE OF THE RUNS

WOULD CONTINUE TO YIELD THE BLENDED SOLUTION OF HPC. NO CHANGES

FOR AFTERNOON FINALS.

AS SHORTWAVE ENERGY MOVES INTO THE FOUR CORNERS REGION EARLY

TUESDAY AND ARCTIC HIGH PRESSURE PLUNGES DEEP INTO THE PLAINS WITH

GREATER THAN 20 DEGREE NEGATIVE TEMPERATURE ANOMALIES. THIS WILL

BRING STRONG UPSLOPE FLOW INTO THE CO ROCKIES FRONT RANGE WITH

MDT/HVY SNOWFALL TO THE SRN ROCKIES SPREADING EWD INTO THE CENTRAL

PLAINS. MID LEVEL ENERGY SHEARS OUT EWD AND A MDT SFC LOW DEVELOPS

OVER ERN TX BY TUESDAY. THIS LOW MOVES NEWD INTO KY/TN WED AND

REFORMS OFF THE MID ATLC CAPES AND RAPIDLY MOVES NEWD OFF NOVA

SCOTIA BY THURSDAY. MDT TO HVY RAINFALL POTENTIAL SOUTH OF THE LOW

PRESSURE TRACK WITH SNOW ACROSS THE CENTRAL PLAINS AND MAINLY

NORTH OF THE OH RIVER AND MASON DIXON LINE INTO NEW ENG. HEAVY

SNOW THREAT INDICATED BY OPERATIONAL MODELS QPF OUTPUT/ANALOGS AND

FAVORABLE MID AND UPPER LEVEL JET STRUCTURE WITH ICING THREAT

ALONG THE CHANGE OVER AND THEN THE DAMMED IN AREA IN THE MID ATLC

PIEDMONT.

PACIFIC RECON FLIGHTS REQUESTED INTO THE CRITICAL UNCERTAINTY AREA

AHEAD OF THIS SYSTEM IN THE NE PACIFIC. IF A FLIGHT IS AVAILABLE

THIS DATA COULD GET INTO THE MODEL SYSTEMS BY THE RUNS OF SUNDAY

00Z/12Z 30 JAN.

RAUSCH/ROSENSTEIN

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Yeah, but 2 or 3 years ago, even for a whopper it wouldn't have been this active. It's ashame we can't confirm it, but IIRC we kept discussion for the Dec 15-16, 2007 storm confined to two threads.

It's the huge potential, lack of a big storm for most of us this winter, and the fact that the original thread was started about 10 days out.

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It's the huge potential, lack of a big storm for most of us this winter, and the fact that the original thread was started about 10 days out.

That's a good point. In last year or so there's been a propensity to start threads way out in advance. In contrast, the thread for 12/07 was started only 5 or 6 days out (No earlier than that 18z/10 run of the GFS that showed it crippling the east coast). But even accounting for that, there's much more posting now than there was then.

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