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February 25-27 Winter Storm Part 2


Chicago Storm

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This actually looks decent....and more like the Euro.....Low placement..not the qpf..

Definitely further south than the Euro.

I think the best bet here is to go with a blend of the NAM/GFS/Euro, which I think is what MKE and LOT are doing, which would account for the lack of watches further northwest in Wisconsin and the western counties of Indiana.

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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1006 PM CST SUN FEB 24 2013

.DISCUSSION...
1000 PM CST

EVENING UPDATE...

AFTER COLLABORATION WITH NWS MILWAUKEE...HAVE ISSUED A WINTER
STORM WATCH FROM TUESDAY AM THROUGH TUESDAY EVENING FOR AREAS
ALONG AND NORTH OF I-80 IN ILLINOIS.

NO BIG CHANGES PLANNED TO GRIDS THIS EVENING AS FORECAST IS
LARGELY ON TRACK. WILL MONITOR OBSERVATIONAL TRENDS FOR VISIBILITY
REDUCTIONS IN FOG AWAY FROM CHICAGO URBAN HEAT ISLAND. ALSO GOOD
RADIATIONAL COOLING SET-UP WITH RIDGE OVERHEAD COULD RESULT IN
SOME LOCATIONS BEING A DEGREE OR TWO COOLER THAN FORECAST.
HOWEVER...SOME SCATTERED CIRRUS CLOUDS SPILLING IN FROM THE WEST
EXPECTED TO LIMIT POTENTIAL FOR TEMPS TO REALLY BOTTOM OUT LIKE
LAST NIGHT WHEN STRATUS FAILED TO MATERIALIZE.

REGARDING TUESDAY WINTER STORM...SYSTEM IS CERTAINLY IMPRESSIVE
AT THIS STAGE WITH HEAVY THUNDERSNOW OVER WESTERN OKLAHOMA.
IT WILL BE IN A WEAKENING/OCCLUDING STAGE WHEN IT APPROACHES OUR
AREA...SO WITHOUT AN APPRECIABLE DEFORMATION AXIS...WE WILL HAVE
TO RELY ON VERY HEAVY SNOWFALL RATES IN THE WARM ADVECTION PATTERN
AHEAD OF THE SYSTEM IN AN APPROXIMATELY 4 TO 6 HOUR PERIOD FROM
MID/LATE TUESDAY MORNING TO MID TUESDAY AFTERNOON TO OVERCOME THE
MARGINAL THERMAL PROFILE IN PLACE. STILL GIVEN THE EXPECTED HIGH
IMPACT OF THE EVENT ON THE TUESDAY AFTERNOON COMMUTE WITH PERIODS
OF HEAVY SNOW POSSIBLE AND VERY STRONG EAST-NORTHEAST WINDS
GUSTING TO 40 MPH...ESPECIALLY ON THE LAKEFRONT...FELT IT WAS
PRUDENT TO ISSUE A WATCH. NONETHELESS...THERE IS STILL A GOOD DEAL
OF UNCERTAINTY GIVEN MARGINAL TEMPS AND MODELS POSSIBLY OVERDOING
QPF TO THIS POINT IN WEAKENING SYSTEM. SOUTHEAST OF WATCH
AREA...THERE IS A MUCH HIGHER POTENTIAL FOR APPRECIABLE MIXED
PRECIP AND LOWER SNOWFALL AMOUNTS SO DID NOT INCLUDE ANY CENTRAL
IL AND NW INDIANA COUNTIES IN WATCH. MID SHIFT WILL ANALYZE FULL
SUITE OF 00Z GUIDANCE.

RC/KJB
 

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You're right, UKIE hasn't been good lately.  FWIW, the SREFs and LSX WRF favor bringing nice accums into the area.  I have no idea, but this storm will put many model's reputations on the line.

 

biggest euro run of the winter?

 

I should be GM of the Bucks..  would have tossed all the junk  before the trade deadline starting with Monta Ellis..  Only the *ucking Bucks would have made that stupid trade they did.

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0z GGEM south. WTF is going on?

 

I'm sorry, but I think the Euro will leave the NAM a desolate outlier by at least 60-100 miles.  The one consideration I have in the NAM's favor is perhaps this is a situation where the higher resolution models (the NAM, short term hi-res models) have an advantage.  Does that seem to be a possibility to you?

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I'm sorry, but I think the Euro will leave the NAM a desolate outlier by at least 60-100 miles.  The one consideration I have in the NAM's favor is perhaps this is a situation where the higher resolution models (the NAM, short term hi-res models) have an advantage.  Does that seem to be a possibility to you?

 

Maybe. But the RGEM is high resolution too. I don't know, something's spooked these models. NAM goes in the opposite direction, which is so funny. Euro will be very interesting.

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RGEM and Ukie would be fitting for the QC.  Wouldn't be surprised at all to see that verify.  NAM has been garbage with the last several systems around here.  GFS still delivers 3-6".  My original pessimistic call of 1-3" may have been the right call after all.  If the Euro goes southeast I'm logging off this site for a long time.  You won't want me on here after that lol...

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