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3/22 - 3/23 Spring Clipper

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#51
Troop

Posted 23 March 2015 - 06:04 AM

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Nice surprise finish to a winter that was often lackluster in the snow department. Have seen 2.5" here in NW IL. Now headed up to Granite Peak for some late season skiing - today starts their "Avalanche Days" so this snow came at a great time. Gotta enjoy winter while we still can.
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#52
Snowshoe

Posted 23 March 2015 - 06:07 AM

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Sorry Troop but there's no fresh snow up this way but i'm sure the Peak will have plenty of snow left for you to play with!


Wisconsin_Rapids.gif


#53
Tom

Posted 23 March 2015 - 06:26 AM

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4.5" IMBY and rippin' nicely.  Close to 1/4 mile visibility.  Pretty cold system to have produced such snowfall totals this time of year.  I agree Geo's, snow ratios are prob close to 12:1 with temps in the upper 20's.  Kinda surprised this snow event wasn't more of a wetter snow.  I'll take it!  The peaceful ambiance a snow storm can bring to a human being.  Love it!

 

Crazy to see how heavily the snow is falling outside right now!  Glad I didn't book my trip to AZ yet, that's probably going to happen this week sometime.



#54
Tom

Posted 23 March 2015 - 06:30 AM

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ORD may come close to avg snowfall for March (5.6") with this system.

 

Fennimore, WI with 15"...here are some more reports:

 

 

12.5" Dodgeville WI 11.5" Dorchester IA 9.0" Decorah IA

 


#55
Tom

Posted 23 March 2015 - 06:33 AM

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Tweet from Mike Hamernick:  "Mid-level frontogenesis is just about off the charts. 1 of the reasons we were concerned about heavy snow yesterday."

 

 

CAx5plRWQAAtO92.jpg



#56
james1976

Posted 23 March 2015 - 06:34 AM

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Wow, cant believe how much snow fell with this storm. It all went around me though. That is an impressive clipper.



#57
Tom

Posted 23 March 2015 - 06:35 AM

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Woah!  Just saw a report that Lightning (Thundersnow) was reported at 5:00am at the Dekalb airport!



#58
Tom

Posted 23 March 2015 - 06:43 AM

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I'd say it is snowing just as heavily as it was during the SP Blizzard, but without the wind.  Pretty amazing.  Nice fluff to the snow as well so it will be easy to shovel away.



#59
Tom

Posted 23 March 2015 - 07:21 AM

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5.8" and counting....looks like the back edge is trying to fill in.  Might have another hour or so of mod/heavy snow from I-90 corridor and points south.



#60
Tom

Posted 23 March 2015 - 07:28 AM

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GoSaints, what was your storm total???



#61
Tony

Posted 23 March 2015 - 07:28 AM

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What a way to bring in the first full week of spring but unfortunately not un-common for these parts and hoping it is the last.



#62
Tom

Posted 23 March 2015 - 07:30 AM

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What a way to bring in the first full week of spring but unfortunately not un-common for these parts and hoping it is the last.

How much do you have so far?  Looking at the radar, it is snowing pretty heavily out by you.



#63
Tony

Posted 23 March 2015 - 08:06 AM

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How much do you have so far?  Looking at the radar, it is snowing pretty heavily out by you.

I did not have a chance to measure but guessing easily over 6" now and still snowing at a moderate pace. Had at least 1" per hr rates going for about 3 hours there.


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#64
Tom

Posted 23 March 2015 - 08:11 AM

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I did not have a chance to measure but guessing easily over 6" now and still snowing at a moderate pace. Had at least 1" per hr rates going for about 3 hours there.

Nice...I'm sitting at a little over 6" and if ORD can sit under that heavier band for another hour or so, it will come close to tying or breaking the daily snowfall record which is around 7".



#65
BLIZZARD09

Posted 23 March 2015 - 08:24 AM

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Sitting at 5 inches here. Hey Tom has been telling us all month winter was not over , and many of us did not beleive!



#66
Tom

Posted 23 March 2015 - 08:31 AM

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Sitting at 5 inches here. Hey Tom has been telling us all month winter was not over , and many of us did not beleive!

I love it when Nature proves the point!  The kinda juice this system has produced would be more common to see Dec-Feb, let alone late March.  Not the last wintry system our region will see over the next 2 weeks.  Not saying Chicago will see more snow, it's possible, but may end up being farther west/north next time.



#67
Geos

Posted 23 March 2015 - 08:44 AM

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Nice reports this morning. I am not sure how much has fallen at home, but I should be able to get a fairly accurate measurement even when I get home. It doesn't look like it will crack freezing today. Probably close to 4" I'm thinking.

 

Only about 2" in Racine, barely. Roads were the biggest mess south of Kenosha this morning with several accidents. Roads were snowy, wet as opposed to snowy, dry which is usually better for traction. I guess some people forgot how to drive in snow over the last two weeks!


Finn Hill, elevation: 460 ft
2018 moisture: 41.76", 2019: 15.32", 6/12

 

2018-2019 winter snowfall total: 29.5"

2017-2018: 9.0", 2016-2017: 14.0"

Weather station/wx cam:
http://map.bloomsky....qBxp6apnJSnqqm2

https://www.wundergr...OTHE144#history


#68
Tom

Posted 23 March 2015 - 08:46 AM

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6.5" IMBY...LOT prob should have gone with a WSW instead.  A lot of ppl did not believe it would snow this much and were caught off guard.  I heard the commute to work was a nightmare this morning.



#69
Tony

Posted 23 March 2015 - 08:49 AM

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Looks like one more batch to come through before it comes to an end. Pretty impressive system I have to say...plenty of juice for a clipper but it is March so they do tend to be stronger.



#70
Illinois_WX

Posted 23 March 2015 - 08:53 AM

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The one time I decide to go home for spring break, we get clocked. About 8" imby here in Red Wing, yet in the city they only got about 4". Crazy difference, that snowband last night punished anyone in between here and Rochester and up towards the southeastern suburbs of the cities. It's beautiful out there though!


'18-'19 DOWNTOWN CHICAGO SNOWFALL TOTAL: ~20" (as of 02/05/19) 

 

 

 

 

 


#71
Geos

Posted 23 March 2015 - 08:55 AM

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Picture from earlier north of Kenosha. This area only less than half of what I have at home though.

 

post-7389-0-58735100-1427128109.jpg


Finn Hill, elevation: 460 ft
2018 moisture: 41.76", 2019: 15.32", 6/12

 

2018-2019 winter snowfall total: 29.5"

2017-2018: 9.0", 2016-2017: 14.0"

Weather station/wx cam:
http://map.bloomsky....qBxp6apnJSnqqm2

https://www.wundergr...OTHE144#history


#72
Maxim

Posted 23 March 2015 - 09:04 AM

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Sitting at 5 inches here. Hey Tom has been telling us all month winter was not over , and many of us did not beleive!


I don't think anybody made the call that wintry weather was over.

#73
Money

Posted 23 March 2015 - 09:33 AM

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Actually majority of people did including you.



#74
Tom

Posted 23 March 2015 - 10:43 AM

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Tulips are wondering...where is Spring???  About 6.8" IMBY...got my cardio in for the day that took about an hour to shovel both my front yard and deck.  My neighbor's already packed away their snow blowers for the season and weren't to enthusiastic about using it again this year.

 

 


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#75
Yerf

Posted 23 March 2015 - 11:35 AM

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Latest reports in the Chicago area

 

http://forecast.weat...on=1&glossary=0



#76
Tom

Posted 23 March 2015 - 11:44 AM

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I think there will be more 6-7" totals showing up later today.  Kane/DuPage/Cook county was in the heavier band of snowfall for a longer period of time.



#77
BLIZZARD09

Posted 23 March 2015 - 12:32 PM

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Tom- why were all the forecasts way underdone for this storm?



#78
Tom

Posted 23 March 2015 - 12:38 PM

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Tom- why were all the forecasts way underdone for this storm?

Actually, the RPM/NAM handled the shift farther north and east quite well.  The frontogenesis was very strong and the models underestimated the strength and duration from a couple days ago.  I remember the models had the band fizzle out as it headed east towards N IL.  Also, the warm and moist air from the south helped feed the system more moisture.  Lastly, the models under played the amount of cold air associated with this system.  Higher snow ratios resulted in more snow.



#79
Geos

Posted 23 March 2015 - 03:08 PM

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Actually, the RPM/NAM handled the shift farther north and east quite well.  The frontogenesis was very strong and the models underestimated the strength and duration from a couple days ago.  I remember the models had the band fizzle out as it headed east towards N IL.  Also, the warm and moist air from the south helped feed the system more moisture.  Lastly, the models under played the amount of cold air associated with this system.  Higher snow ratios resulted in more snow.

 

Hey - I was trying to figure out if I got 3" or a bit more. How much compaction have you seen today? An official report about 2 miles away had 4.6" and I'm thinking I got closer to 4", but not sure since I couldn't measure until now.


Finn Hill, elevation: 460 ft
2018 moisture: 41.76", 2019: 15.32", 6/12

 

2018-2019 winter snowfall total: 29.5"

2017-2018: 9.0", 2016-2017: 14.0"

Weather station/wx cam:
http://map.bloomsky....qBxp6apnJSnqqm2

https://www.wundergr...OTHE144#history


#80
Tom

Posted 23 March 2015 - 03:15 PM

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Hey - I was trying to figure out if I got 3" or a bit more. How much compaction have you seen today? An official report about 2 miles away had 4.6" and I'm thinking I got closer to 4", but not sure since I couldn't measure until now.

I've been measuring on my deck and it has compacted about 1.0"-1.25".  The measurements some are taking I think were done on cement/street levels that allowed more melting.  My current snow depth is 5.5".



#81
Geos

Posted 23 March 2015 - 03:33 PM

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I've been measuring on my deck and it has compacted about 1.0"-1.25".  The measurements some are taking I think were done on cement/street levels that allowed more melting.  My current snow depth is 5.5".

 

Thanks.

I think I'll go with 3.8" here. With 0.29" of water that would be a 12:1 ratio. One thing that is challenging with spring snows, is if your not home to measure right away during the day when it stops - it's hard to figure out the actual total later.

 

This snow put my average above normal now for the season. Impressive from the December and early January we had.


Finn Hill, elevation: 460 ft
2018 moisture: 41.76", 2019: 15.32", 6/12

 

2018-2019 winter snowfall total: 29.5"

2017-2018: 9.0", 2016-2017: 14.0"

Weather station/wx cam:
http://map.bloomsky....qBxp6apnJSnqqm2

https://www.wundergr...OTHE144#history


#82
WildWisconsinWeather

Posted 23 March 2015 - 04:49 PM

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Actually majority of people did including you.

 

What are you thinking for tomorrow night's system Money?  This winter has been filled with disappointments here, so I'm ready for spring weather for good, but of course that won't happen, will it?



#83
Money

Posted 23 March 2015 - 05:58 PM

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What are you thinking for tomorrow night's system Money?  This winter has been filled with disappointments here, so I'm ready for spring weather for good, but of course that won't happen, will it?

 

Meh. i haven't even looked at the models for at least couple days. Just saw it mentioned in the AFD tonight. I'll wait and see what 0z runs show. 



#84
Tom

Posted 23 March 2015 - 06:22 PM

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Nice write-up regarding this late season snow event....

 

Snowfall Totals

 

Preliminary Snowfall Map

prelimsf.jpg

Map based on Local Storm Reports

 

 

 

Meteorology

Some of the key meteorological takeaways of this event:

  • The timing of this event was key to impacts, in that it came during the morning commute time, including in the Rockford and Chicago metro areas. 
  • Snowfall rates of 1-2" per hour were common during Monday morning and spread across a larger area than is typically seen with a Pacific/Clipper-hybrid system.  Normally such rates with these systems archetypes are in focused bands.
  • High moisture (3-4 g/kg) was steered into the precipitation forcing region of this system.  In other words, ample moisture was ingested and the forcing for lift was strong enough to wipe out the dry low-level air mass ahead of the snow.
  • The thermal profile aloft was unstable enough to warrant some thundersnow to the northwest of the area.  Even though thundersnow did not occur in our area, the thermal profile aloft was quite unstable per observation and analysis and thus resulted in stronger areas of rising air and quicker precipitation development and increased rates.
  • Typically with early or late season events where the atmosphere is milder than during the heart of winter, snow-to-liquid ratios can be quite low...or in other words, the "efficiency" of the atmosphere to produce snowfall from the same amount of liquid diminishes.  While low ratios were indeed observed, the vertical temperature and moisture profiles ended up being ideal for snow aggregation, where flakes "clump" together as they fall, leading to larger flakes reaching the surface producing quicker and larger accumulations. 

 

Water Vapor Satellite Loop on 3/23/15: 2 am - 12 pm

15mar23wv.gif

This satellite loop shows the pronounced upper level wave and its areas of rapid saturation in advance, where the heaviest of snow was being observed under. 

 

 

Elevated Lapse Rates (Instability) on 3/23/15:  7 a.m.

850mb Warm Advection (Milder Air Advancing and Lifting) on 3/23/15:  10 a.m.

lapserates.jpg

waa.jpg

 

 

NWS Chicago 0.5° Radar Image from 3/23/15:  8:30 a.m.

15mar23radar1.jpg

 

 

15mar23xsect1.jpg

15mar23xsect2.jpg

 

 

 

Late Season Snow Climatology

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
242 PM CDT MON MAR 23 2015

...LARGEST CALENDAR DAY SNOW AFTER THE SPRING EQUINOX SINCE 1982...

BOTH ROCKFORD AND CHICAGO OHARE AIRPORTS TODAY...MARCH 23RD...
RECEIVED OVER FIVE INCHES OF SNOW. THIS WAS THEIR HIGHEST CALENDAR
DAY SNOW AFTER MARCH 21ST SINCE 1982. PLEASE SEE THE FOLLOWING
TABLES TO SEE WHERE THE SNOW RANKED WHEN COMPARED TO ALL OTHER POST
SPRING EQUINOX SNOWFALLS OF FIVE INCHES OR MORE:

...CHICAGO...

RANK VALUE DATE
1 13.6 MARCH 25 1930
2 9.4 APRIL 5 1982
- 9.4 APRIL 2 1975
4 9.0 APRIL 6 1938
5 8.9 MARCH 26 1970
6 8.2 APRIL 1 1970
7 7.8 MARCH 30 1926
8 7.7 MARCH 29 1954
9 7.1 MARCH 29 1964
10 6.6 MARCH 26 1934
11 6.5 MARCH 29 1972
12 6.4 APRIL 4 1920
13 5.6 MARCH 23 2015
- 5.6 MARCH 26 1930
15 5.4 MARCH 25 1970
- 5.4 MARCH 23 1965
- 5.4 APRIL 16 1961
18 5.3 MARCH 28 1894

THE TOTAL SNOWFALL FOR THIS MOST RECENT EVENT WAS 5.8
INCHES WITH 0.2 OF THAT HAVING FELL ON MARCH 22ND AND THUS NOT
INCLUDED IN THE TABLE ABOVE.


...ROCKFORD...

RANK VALUE DATE
1 13.5 MARCH 31 1926
2 12.0 MARCH 23 1897
3 10.4 MARCH 29 1972
4 7.0 APRIL 18 1912
5 6.3 APRIL 5 1982
6 6.0 APRIL 6 1938
- 6.0 MARCH 25 1933
8 5.1 MARCH 23 2015
9 5.0 MARCH 29 1954
- 5.0 MARCH 25 1933

$

JEE



#85
Money

Posted 23 March 2015 - 06:43 PM

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What are you thinking for tomorrow night's system Money?  This winter has been filled with disappointments here, so I'm ready for spring weather for good, but of course that won't happen, will it?

 

18z GFS had 0.7 QPF in MKE with mostly rain (temps between 32.5-33.5 degrees)

 

18z NAM was a bit warmer. 

 

 

18z GFS had about 7 inches of snow in LSE and near gosaints area 



#86
WildWisconsinWeather

Posted 23 March 2015 - 07:15 PM

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18z GFS had 0.7 QPF in MKE with mostly rain (temps between 32.5-33.5 degrees)

 

18z NAM was a bit warmer. 

 

 

18z GFS had about 7 inches of snow in LSE and near gosaints area 

 

Yeah, I'm not expecting anything here, more excited about isolated thunder prospects than anything wintry tbh.



#87
FV-Mike

Posted 24 March 2015 - 07:22 AM

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Nice graphic from Skilling showing how unusual the storm was yesterday. Great to get one last push of snow!

 

 

Attached Files


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