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January 2013 General Discussion


Chicago Storm

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Dusting in mby.

I was driving back from barrington and the state was salting the roads as if we were expecting an ice storm.

 

They always seem to salt like crazy around that area! Gurnee usually does too.

 

Had a low of 5° this morning. Little warmer thanks to a few clouds over night. Up to 16° now at 2pm.

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Any thought being given to N-NE wind direction tomorrow with associated LES heading into odd places like Saginaw Bay from Lake Huron and down the St Clair River with enhancement from Lake St Clair into Detroit-Windsor? Or will it be NNW to N and fall mostly in Sarnia towards Ridgetown ON?

 

The current weak Great Lakes thermal low will be blasting past Lake Ontario by sunrise and flow should turn almost NE for a time, tapping into the -30s over northern Ontario. Lake Huron is 3-5 C, should be rather easy to get low-topped conveyor belt type streamers going and while narrow they could be dropping 5-10 inch amounts locally.

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Is this a typo? :o

DVN

A NARROW BAND OF DENDRITIC SNOW THIS MORNING ACCUMULATED TO 0.5 TO 2.0 INCHES ROUGHLY ALONG HIGHWAY 20. THIS BAND OF SNOW OCCURRED ON THE CYCLONIC SIDE OF A NARROW 100 KNOT MID LEVEL WIND MAXIMUM WHERE VERTICAL MOTION WAS ENHANCED AND WAS CONCENTRATED IN A TIGHT BAROCLINIC ZONE. 850 MB TEMPERATURES AT 12Z WERE -20C AT KGRB AND +1C AT KOMA. SOUNDINGS INDICATED SATURATION OCCURRED IN THE FAVORED DENDRITIC GROWTH ZONE OF -12 TO -18C. SNOW/LIQUID RATIOS WERE AN INCREDIBLE 120:1 BASED ON OBSERVER MEASUREMENTS.

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Is this a typo? :o

DVN

A NARROW BAND OF DENDRITIC SNOW THIS MORNING ACCUMULATED TO 0.5 TO 2.0 INCHES ROUGHLY ALONG HIGHWAY 20. THIS BAND OF SNOW OCCURRED ON THE CYCLONIC SIDE OF A NARROW 100 KNOT MID LEVEL WIND MAXIMUM WHERE VERTICAL MOTION WAS ENHANCED AND WAS CONCENTRATED IN A TIGHT BAROCLINIC ZONE. 850 MB TEMPERATURES AT 12Z WERE -20C AT KGRB AND +1C AT KOMA. SOUNDINGS INDICATED SATURATION OCCURRED IN THE FAVORED DENDRITIC GROWTH ZONE OF -12 TO -18C. SNOW/LIQUID RATIOS WERE AN INCREDIBLE 120:1 BASED ON OBSERVER MEASUREMENTS.

 

Unless someone got like 6" of snow out of 0.005 liquid equivalent I am going to guess yes, although the word incredible makes me wonder.

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They always seem to salt like crazy around that area! Gurnee usually does too.

 

Had a low of 6° around midnight with mostly clear skys. Little warmer with rising temps to 10° at 5am thanks to clouds and winds going sw over night. Up to 17° now at 2pm.

 

5.2° at the nearest wunderground station in Zion.

 

Just flurries right now. Looks like ORD is under an intense band right now.

 

---

 

Lol 120:1 ratios! Yeah that's a typo, if not I want to see pics.

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I am confused, wouldn't .01" of water at 120/1 be 1.2 inches of snow? Or I am missing something in regards to how ratios work?

Nm, you are right. I think I need a nap after that brain lapse...

 

I guess 1.2" out of .01 liquid could be possible. Though I would highly doubt it.

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The DGZ was progged to be like 400 mb deep in northern IL today so maybe the high ratios are legit. Plus I don't know what they would've meant to type in place of 120...say they accidentally added a 1 to the 120...that would make it 20:1 which is not all that incredible.

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PRELIMINARY LOCAL STORM REPORTNATIONAL WEATHER SERVICE QUAD CITIES IA IL1208 PM CST WED JAN 23 2013..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON.....DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....            ..REMARKS..1206 PM     SNOW             1 NW DUBUQUE REGIONAL A 42.41N 90.73W01/23/2013  M1.2 INCH        DUBUQUE            IA   OFFICIAL NWS OBS            6 HOUR SNOWFALL TOTAL

This might be the report they mention, the 6 hour precip per asos were a trace there. Though using ASOS to adequately measure snowfall with winds over 10kts is asking a lot. 

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1208 PM CST WED JAN 23 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1206 PM     SNOW             1 NW DUBUQUE REGIONAL A 42.41N 90.73W
01/23/2013  M1.2 INCH        DUBUQUE            IA   OFFICIAL NWS OBS

            6 HOUR SNOWFALL TOTAL

This might be the report they mention, the 6 hour precip per asos were a trace there. Though using ASOS to adequately measure snowfall with winds over 10kts is asking a lot.

It looks like the winds were less than that while it was snowing...well, at least the hourly obs were less.

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