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Old 12-19-2017, 11:51 PM
 
Location: St. Louis Park, MN
7,755 posts, read 6,573,622 times
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This mid-December thaw was annoying. Melted a good amount of snow :/ Hope we get more over the week. Either way I will have a white Christmas for sure! A frigid below zero Christmas, but a white nonthless!
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Old 12-20-2017, 03:55 AM
 
Location: Live:Downtown Phoenix, AZ/Work:Greater Los Angeles, CA
27,590 posts, read 14,775,188 times
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Today's forecast high is 20.6°C, 1.7°C above average

Currently 8.9°C with a dewpoint of 3.3°C at 3am Mountain Time
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Old 12-20-2017, 04:05 AM
 
Location: The canyon (with my pistols and knife)
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Lock it in from five days out: Athens, GA and vicinity will have a nice, cold, beautiful Christmas!

The big difference between the GFS and the ECMWF is still the timing of the frontal passage, with the spread actually widening in the last 24 hours. The difference is 24 hours now, versus 12-18 hours 24 hours ago. The good news is, both models have accelerated the frontal passage, with the GFS passing it on Saturday evening, and the ECMWF passing it on Sunday (Christmas Eve) evening. This difference produces two different temperature trends on Monday (Christmas Day) with somewhat similar results. Since the GFS has the front long gone by Monday, temperatures will rise and fall as normal, with a morning low in the upper 20s and an afternoon high in the mid-40s. On the other hand, since the ECMWF has a Sunday evening frontal passage, temperatures will fall all day on Monday, with a high in the mid-40s at midnight, and a low in the mid-30s just before midnight on Tuesday. Either way is fine with me, because the temperature could stay lower this Christmas than either of the last two Christmases (the low was 64°F in 2015, and 44°F in 2016). Also worth noting is that the amount of precipitation with the frontal passage has been dialed back from about 2" to about 1".

Even more good news is that today and Saturday now appear to be the only days before the frontal passage with temperatures significantly above normal. Highs both days are forecast to be in the mid- to upper 60s, and lows both days are forecast to be in the mid- to upper 50s. Thursday still has easterly winds and cool-/cold-air damming in the forecast, with a low temperature range from the mid-40s to the mid-50s. Friday appears to be mild, with highs in the upper 50s to lower 60s, and lows in the mid- to upper 40s. Unfortunately, the high yesterday was 72°F, so this is now the seventh consecutive December with at least one 70°F day. Ironically, it never felt quite that warm to me yesterday, so I was surprised to find out. I would have thought the high was in the mid-60s. There's a fair chance at another 70°F day on Saturday, but otherwise that's it. From Christmas Eve through the rest of December, temperatures are forecast to be consistently below normal. I even see snow on the ECMWF around New Year's Day!
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Old 12-20-2017, 04:21 AM
 
Location: The canyon (with my pistols and knife)
14,207 posts, read 22,898,781 times
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Quote:
Originally Posted by nei View Post
nice work, but hard to interpret since I can't remember when Craziaskowboi lives,



here's what the GFS says for the actual 850 hPa temperatures rather than anomalies. A very cold airmass; -32°C over the Upper Midwest. I like that tropicaltidbits masks out areas too high in elevation to have an 850 hPa; often those numbers make little sense when they're interpolated from above. Neat way to show where the high elevation areas of the West are, too.

I live in the exurban nebula between Atlanta and Athens, but closer to Athens. That 850 map appears to have drawn the freezing line right over my house.
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Old 12-20-2017, 05:07 AM
 
Location: Washington County, PA
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Quote:
Originally Posted by nei View Post
random wind gust just blasted; think a cold front is going to pass through. 44°F at midnight, a lot of snow has melted
It's 33° here as of 6 am. Our snowpack had died, only piles and a trace on northern slopes of the hills remain
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Old 12-20-2017, 05:37 AM
 
Location: Near the Coast SWCT
83,730 posts, read 76,293,215 times
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Quote:
Originally Posted by speagles84 View Post
It's 33° here as of 6 am. Our snowpack had died, only piles and a trace on northern slopes of the hills remain
Here too.. All gone except scattered piles around. 2nd time our snowpack melted completely. Typical for December. Time to start fresh again.


On that note::

My backyard snowpack by the day.. This is the 7am observation each day..

2017
Dec 10: 4.7"
Dec 11: 3.0"
Dec 12: 1.5"
Dec 13: T

Dec 14: 0.8"
Dec 15: 0.7"
Dec 16: 1.9"
Dec 17: 1.5"
Dec 18: 1.0"
Dec 19: T

Dec 20: 0
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Old 12-20-2017, 05:40 AM
 
Location: Near the Coast SWCT
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Yesterdays Northeast Min temps. December 19, 2017






Yesterdays Northeast Max Temps December 19, 2017






Source:
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Old 12-20-2017, 06:41 AM
 
Location: Alexandria, Louisiana
5,045 posts, read 4,388,491 times
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Storms came through overnight last night, and I got 0.53" of rain. There was a tornado warning about 50 miles to my south, and a reported tornado in the Lake Charles area.
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Old 12-20-2017, 07:05 AM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

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Location: Western Massachusetts
45,983 posts, read 53,860,379 times
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Quote:
Originally Posted by Craziaskowboi View Post
I live in the exurban nebula between Atlanta and Athens, but closer to Athens. That 850 map appears to have drawn the freezing line right over my house.
Duh. Don't know why I forgot, you mentioned it before enough times. It's been a while?
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Old 12-20-2017, 07:34 AM
 
Location: Syrmia, Northern Serbia, near 45 N
7,223 posts, read 3,147,098 times
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Today in Serbia the lowest temperature was in Kopaonik -15c , and the highest was in Loznica 2c.

In my town temperature was from -4c to 1c.

In whole Serbia was cloudy, except some mountain places where was a little sun.
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