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Clipper express v 2.0 (February 1-6)


snowstormcanuck

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Just noticed there isn't an advisory out yet for Chicagoland.  Not a good idea IMO considering the incoming moderate event coinciding with super bowl Sunday.  There's gonna be a lot of people out tonight. 

 

 

I don't think things start sticking until after midnight...but we'll probably get an advisory for I88 north soon

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Just noticed there isn't an advisory out yet for Chicagoland.  Not a good idea IMO considering the incoming moderate event coinciding with super bowl Sunday.  There's gonna be a lot of people out tonight. 

 

drove home back in 2008 after the super bowl after that surprise quick +SN event that night

 

That was fun.

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LOT just pulled the trigger and issued an advisory for 2-5".

 

Lol, it's ok if a system give the moisture finger towards you! Anyone is Cook or Lake County could get the lake influence - not sure it would come this far north though.

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LOT goes WWA...

 

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM 10 PM THIS
EVENING TO NOON CST MONDAY.

* TIMING...SNOW WILL BEGIN LATE THIS EVENING AND DIMINISH TOWARD
MIDDAY MONDAY...THOUGH LIGHT SNOW SHOWERS MAY LINGER THROUGH
MONDAY AFTERNOON.

* ACCUMULATION...2 TO 5 INCHES WITH THE HIGHEST AMOUNTS EXPECTED
ALONG AND NORTH OF A ROCKFORD TO CHICAGO LINE. LOCALIZED
SLIGHTLY HIGHER AMOUNTS ARE POSSIBLE ACROSS COOK COUNTY IF LAKE
ENHANCEMENT CAN OCCUR LATE MONDAY MORNING.

* MAIN IMPACT...SNOWFALL RATES OF UP TO ONE INCH PER HOUR MAY
OCCUR AT TIMES LEADING TO RAPID SNOW ACCUMULATION ON ROADWAYS.
THE HEAVIEST INTENSITY IS EXPECTED FROM APPROXIMATELY 11 PM TO 4
AM FROM THE ROCKFORD TO MARENGO AREAS AND BETWEEN APPROXIMATELY
3 AM AND 8 AM FOR CENTRAL AND NORTHERN AREAS OF THE CHICAGO
METRO AREA.  

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Noticed that.  Makes you wonder a bit.

 

Many of the models have shown the precip shield "curl" up a bit as it moves through northern IL.  These little vigorous waves with high-ratio snows/fat dendrites that have a nice little pivot to them as they move through often overperform at the pivot point.  That's what we benefited from with the super clipper of Dec '10.  Not expecting anything like that with this but still should be a very interesting event for a localized area.

 

4km has a solid 4"+ band from ORD points north.

sbsn.jpg

 

MSN to ORD express, classic Alberta Clipper track.

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I'm just me nitpicking, and it's due to it be a county by county warning thing I guess...but it just looks strange sometimes. Inside the red line, places aren't in the advisory, but are sort of surrounded by them. Like the NE corner of DeKalb county.

 

attachicon.gifScreen Shot 2013-02-03 at 1.19.24 PM.png

This is why they need additional zones or polygon-like based winter headlines.

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I'm just me nitpicking, and it's due to it be a county by county warning thing I guess...but it just looks strange sometimes. Inside the red line, places aren't in the advisory, but are sort of surrounded by them. Like the NE corner of DeKalb county.

 

attachicon.gifScreen Shot 2013-02-03 at 1.19.24 PM.png

 

Yep, could see some in northeast DeKalb county getting more than someone near the Aurora Airport.

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I'm just me nitpicking, and it's due to it be a county by county warning thing I guess...but it just looks strange sometimes. Inside the red line, places aren't in the advisory, but are sort of surrounded by them. Like the NE corner of DeKalb county.

 

attachicon.gifScreen Shot 2013-02-03 at 1.19.24 PM.png

 

Another county that could be in it is Stephenson County. Really sharp gradient on the southern edge. Polygon advisories would work good with a system like this.

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LOT update

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1235 PM CST SUN FEB 3 2013
 
.DISCUSSION...
1230 PM CST
 
WENT AHEAD AND ISSUED A WINTER WEATHER ADVISORY FOR THE
NORTHEASTERN PART OF THE CWA FROM ROUGHLY ROCKFORD TO CHICAGO TO
VALPARAISO FOR THE APPROACHING CLIPPER TYPE SYSTEM TONIGHT AND
MONDAY. ANALYSIS OF LATEST OBS AND 12Z FORECAST GUIDANCE SUPPORT
SNOW DEVELOPING FROM LATE THIS EVENING INTO EARLY TONIGHT FROM
NORTHWEST TO SOUTHEAST. DEEP LAYER MOISTURE INCREASES FROM THE
SOUTH AS THE LOW/MID LEVEL FLOW TURNS BRIEFLY SOUTHERLY TONIGHT
AND PRECIPITABLE WATER VALUES INCREASE TO NEARLY 0.4 INCHES OR
MORE THAN TWICE THEIR CURRENT VALUES. A WELL ORGANIZED AREA OF
FRONTOGENETICAL FORCING DEVELOPS IN THE MID LEVEL OVERNIGHT
THROUGH MID MORNING MONDAY WITH FORECAST TIME- HEIGHT SECTIONS
INDICATING NEGATIVE EPV DEVELOPING ABOVE THIS LAYER OF FOCUSED
FORCING ALLOWING ENHANCEMENT OF VERTICAL MOTION/CONVECTIVE
PROCESSES. IN ADDITION...THIS FORCING LOOKS TO BE WELL ALIGNED
WITHIN THE FAVORED SNOW GROWTH ZONE FOR ABOUT A 3-5 HOUR PERIOD
OVERNIGHT THROUGH MID MORNING DEPENDING ON LOCATION WITH WESTERN
AREAS SEEING THIS EARLIER AND EASTERN AREAS LATER. BETWEEN THE
FORCING...FAVORABLE MICROPHYSICAL PROCESSES AND THE INFLUX IN
AVAILABLE MOISTURE FOR THESE TO ACT ON...A PERIOD OF MODERATE TO
PERHAPS EVEN BRIEFLY HEAVY SNOWFALL WITH GOOD FLAKE SIZE AND
EFFICIENT ACCUMULATION IS APPEARING MORE LIKELY. AMOUNTS OF 2 TO 5
INCHES ARE EXPECTED ACROSS THE ADVISORY AREA WITH THE HIGHER END
OF THE RANGE FAVORED ALONG/NORTH OF A ROCKFORD TO CHICAGO TO
VALPARAISO LINE...WITH AMOUNTS TAPERING OFF JUST TO THE SOUTH. IN
OTHER WORDS IS IS IMPORTANT TO KEEP IN MIND THAT SOUTHERN AREAS OF
KANE...DUPAGE...COOK...LAKE INDIANA...AND PORTER INDIANA MAY SEE
2-3 INCHES OF SNOW BUT IT MAY ALSO FALL OVER A SHORT PERIOD OF
TIME. 
 
IN ADDITION...WITH THE LOW PRESSURE CENTER OF THIS SYSTEM
PASSING TO THE SOUTHWEST OF THE AREA...WINDS WILL TURN EAST THEN
NORTHEAST AND THEN NORTH ACROSS SOUTHERN LAKE MICHIGAN FROM MID
TO LATE MORNING LAKE ENHANCEMENT/LAKE EFFECT IS A GOOD
POSSIBILITY...ESPECIALLY AS THE FETCH INCREASES AS WINDS TURN MORE
NORTHEAST. THIS SETS UP THE POTENTIAL FOR AN ADDITIONAL PERIOD OF
ENHANCED SNOWFALL ACROSS COOK COUNTY DURING THE LATE MORNING. NOT
EXACTLY CLEAR HOW THIS WILL EVOLVE IN TERMS OF MAGNITUDE AND
ADDITIONAL ACCUMS...BUT IF IT IS WELL ORGANIZED THEN A QUICK
ADDITIONAL INCH OR TWO IS POSSIBLE...WHICH COULD RESULT IN LOCAL
AMOUNTS NEAR 6 INCHES. ANY ENHANCED BAND DOES LOOK TO STEADILY
PIVOT SOUTHWARD SO IT WOULD BE SHORT LIVED...BUT AGAIN COULD BE
QUITE INTENSE. WILL NEED TO KEEP AN EYE ON THIS. FOR NW
INDIANA...LAKE EFFECT/ENHANCEMENT PROCESSES WILL BE BETTER FOCUSED
DURING THE AFTERNOON AS WINDS TURN NORTH. HAVE KEPT THE HEADLINE A
WINTER WEATHER ADVISORY VS. A LAKE EFFECT SNOW ADVISORY BECAUSE
MUCH OF THE ACCUMULATION WILL BE FROM THE SYNOPTIC SYSTEM WITH
LAKE PROCESSES GETTING UNDERWAY FOR A SHORT WINDOW OF TIME BEFORE
WINDING DOWN. WILL NEED TO MONITOR EVOLUTION OF LAKE EFFECT MONDAY
EVENING AS THERE IS SOME EVIDENCE OF A CONVERGENCE SINGLE BAND
DEVELOPING AND SHIFTING EAST.
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Returns starting to blossom over MN...here's to an over performer

It's going to be easy to extrapolate who will be getting the good snow once this starts laying down a snow swath in Minnesota, basically just have to look at the radar accumulated precip and draw a slightly curved line in the direction of motion

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It's going to be easy to extrapolate who will be getting the good snow once this starts laying down a snow swath in Minnesota, basically just have to look at the radar accumulated precip and draw a slightly curved line in the direction of motion

 

 

yep, part of why I feel so good about my chances with this one.

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It's not accumulating anymore, but it's still snowing here. Window dressing for sure. 

 

IND has 1-2" in my p&c for this next one. Eh, maybe 1-2 flakes. :D 

 

Monday: Snow likely, mainly after 1pm. Cloudy, with a high near 28. South wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

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It's not accumulating anymore, but it's still snowing here. Window dressing for sure.

IND has 1-2" in my p&c for this next one. Eh, maybe 1-2 flakes. :D

Monday: Snow likely, mainly after 1pm. Cloudy, with a high near 28. South wind 3 to 8 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

Yeah I'm not sure about 1-2. Model qpf is paltry (even the "bullish" solution are less than .05) and thermal profiles aren't favorable for very high ratios. I think a coating is our ceiling for this one.

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Ready to see this thing stack up like the Groundhog Day pancakes served at the local festival breakfasts this weekend.

We will be in Libertyville for game and wife going to stay behind. Her commute from there to work will be a hell of a lot easier (5 miles vs. 32). My 5 a.m.'er down to Elmhurst will be another story.

I'm looking for 5.5+ imby. Let's get the county trails open for the first time this season.

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Yeah I'm not sure about 1-2. Model qpf is paltry (even the "bullish" solution are less than .05) and thermal profiles aren't favorable for very high ratios. I think a coating is our ceiling for this one.

 

I think at best we get something like what we've gotten this afternoon, flakes that amount to nothing. Temps in the upper 20's, during the daytime, weak rates, blah blah. 

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