ConiferMtnMan Posted January 1, 2015 Share Posted January 1, 2015 Not sure how cold it got at the house last night but it was -17 when I got home from work at 7. Pipes were frozen when I arrived, so I didn't pay any attention to how cold it got after that. Keep those faucets dripping, folks! Link to comment Share on other sites More sharing options...
Chinook Posted January 1, 2015 Author Share Posted January 1, 2015 Fort Collins-Loveland low temp, -27 C (-16.6 F) KFNL 311155Z AUTO 00000KT 10SM CLR M26/M30 A3026 RMK AO1 11240 21270 57017 Greeley low temp -34C (-29.2 F) KGXY 311255Z AUTO 33003KT 4SM CLR M34/ A3028 RMK AO1 Link to comment Share on other sites More sharing options...
frontranger8 Posted January 2, 2015 Share Posted January 2, 2015 coldest METAR observation at Denver -- Conditions at: KDEN observed 31 December 2014 03:53 UTC Temperature: -26.1°C (-15°F) Dewpoint: -28.3°C (-19°F) [RH = 82%] As I think you saw after you posted this, they actually hit -19 earlier in the night. Link to comment Share on other sites More sharing options...
Chinook Posted January 2, 2015 Author Share Posted January 2, 2015 This -19 degree reading must have been observed, without it showing up in the METAR codes. I believe it was between individual METAR reports. Wunderground plot of temps on Wednesday morning. Link to comment Share on other sites More sharing options...
castlerockwx Posted January 2, 2015 Share Posted January 2, 2015 A little deformation zone magic over the Palmer Divide tonight! 3.5" just east of Castle Rock and still coming down steadily. NWS has issued a Winter WX advisory for 2"-5". I had a gut feeling earlier in the week one of these next two systems would out produce models. Link to comment Share on other sites More sharing options...
Chinook Posted January 2, 2015 Author Share Posted January 2, 2015 Nice! Interesting twitter feed regarding Colorado weather https://twitter.com/NobleBrett Link to comment Share on other sites More sharing options...
Chinook Posted January 2, 2015 Author Share Posted January 2, 2015 decent mesoscale snowband for part of our area Link to comment Share on other sites More sharing options...
frontranger8 Posted January 2, 2015 Share Posted January 2, 2015 This -19 degree reading must have been observed, without it showing up in the METAR codes. I believe it was between individual METAR reports. Wunderground plot of temps on Wednesday morning. temps at 6am dec 31 2014.jpg That -29 at the Greeley airport is insane. Link to comment Share on other sites More sharing options...
frontranger8 Posted January 2, 2015 Share Posted January 2, 2015 A little deformation zone magic over the Palmer Divide tonight! 3.5" just east of Castle Rock and still coming down steadily. NWS has issued a Winter WX advisory for 2"-5". I had a gut feeling earlier in the week one of these next two systems would out produce models. Congrats. The band has stayed just to the south and east of me all evening...got maybe .5" here. Looks like DEN has been right in the middle of it for the past few hours. Link to comment Share on other sites More sharing options...
Chinook Posted January 2, 2015 Author Share Posted January 2, 2015 That -29 at the Greeley airport is insane. Greeley Airport is in a small valley near one of the rivers. It is regularly colder with the morning lows than Greeley city on nights with good radiational cooling. It is particularly interesting in these very cold conditions. It also gets to 99 degrees quite often compared to other places around here. Link to comment Share on other sites More sharing options...
frontranger8 Posted January 3, 2015 Share Posted January 3, 2015 Greeley Airport is in a small valley near one of the rivers. It is regularly colder with the morning lows than Greeley city on nights with good radiational cooling. It is particularly interesting in these very cold conditions. It also gets to 99 degrees quite often compared to other places around here. Oh, no doubt. Definitely an ideal location for radiational cooling. However, -29 appears to be pretty impressive even for that location. I'm not sure when the last time they got that cold was, but that was colder than they got with the Feb 2014 cold wave and anything else in recent years. I can't find their records back more than a few years on the NWS site, any idea? Link to comment Share on other sites More sharing options...
Chinook Posted January 3, 2015 Author Share Posted January 3, 2015 Since 2011, there have been F6 type climate forms for FNL, GXY, and some other airports in the Boulder/Denver CWA. They do not have F6 climate forms before October 2011 for these locations. The rest of official or semi-official climate records for several cities are based on co-op observers. You can click on NOWDATA on the climate page to find out more historical information, which is mainly from co-op data. Looks like we could get some snow tomorrow night with the cold front. I think trace-2" is possible for northern Colorado. Actually the NWS has around 1-4" for our area, generically. Link to comment Share on other sites More sharing options...
frontranger8 Posted January 3, 2015 Share Posted January 3, 2015 Since 2011, there have been F6 type climate forms for FNL, GXY, and some other airports in the Boulder/Denver CWA. They do not have F6 climate forms before October 2011 for these locations. The rest of official or semi-official climate records for several cities are based on co-op observers. You can click on NOWDATA on the climate page to find out more historical information, which is mainly from co-op data. Looks like we could get some snow tomorrow night with the cold front. I think trace-2" is possible for northern Colorado. Actually the NWS has around 1-4" for our area, generically. Right, yeah that's what I mean...there's co-op date for pre-2011, but I don't see any for the Greeley airport. Link to comment Share on other sites More sharing options...
Chinook Posted January 3, 2015 Author Share Posted January 3, 2015 Nice flakes here. Link to comment Share on other sites More sharing options...
frontranger8 Posted January 3, 2015 Share Posted January 3, 2015 Just like the other day, areas east of I-25 are getting pounded down here, while I've only gotten about .5". Ha, oh well. This might be the year where DEN's snowfall actually reflects the metro area well. They've done pretty well over the past couple weeks. Link to comment Share on other sites More sharing options...
Chinook Posted January 4, 2015 Author Share Posted January 4, 2015 tweet from CDOT I-70 closed in both directions from Limon to KS b/c icy roads & poor visibility;no est time of reopening Link to comment Share on other sites More sharing options...
ConiferMtnMan Posted January 4, 2015 Share Posted January 4, 2015 1.5-2" up here. Most of it fell within an hour. Link to comment Share on other sites More sharing options...
mayjawintastawm Posted January 4, 2015 Share Posted January 4, 2015 Got home from the mountains yesterday evening (took 4 hours from Frisco on I-70- grrr...) to a nice fresh 4" on top of probably 3" from the 30th. Had to shovel the driveway- wow! First time actually had to shovel this season. Cherry Creek SP has ideal XC skiing this morning- get there while you can! Link to comment Share on other sites More sharing options...
Chinook Posted January 4, 2015 Author Share Posted January 4, 2015 My storm totals Early Nov: 3" Nov 15: 1" Nov total: 4" before Christmas: 0.3" Christmas-Dec 26: 8" (neighborhood average) Dec 29-30th: 2.2" December total: 10.5" Jan 3rd: 0.5" total: 15" Link to comment Share on other sites More sharing options...
Chinook Posted January 4, 2015 Author Share Posted January 4, 2015 Talking about the northern Rockies (near the MT/Canada border), the 4km NAM (and NWS forecasts) show something like 30-40" in the next 3 days east of Kalispell, MT. strongly-worded quote from NWS Missoula weather story An extremely powerful winter storm will pound the Northern Rockies with an unrelenting period of heavy snow that will begin tonight and is expected to persist in many areas through Tuesday evening. Significant impacts to travel, commerce and public safety are likely due to the anticipated transition from powdery snow to heavy, wet snow over the next twenty-four hours. Link to comment Share on other sites More sharing options...
Chinook Posted January 5, 2015 Author Share Posted January 5, 2015 Temperatures rose from around 0 to 58.9 degrees, with a few 60mph gusts near the foothills. Link to comment Share on other sites More sharing options...
Chinook Posted January 6, 2015 Author Share Posted January 6, 2015 recent list of high wind reports from the mountains (Channel 9 News) Link to comment Share on other sites More sharing options...
frontranger8 Posted January 6, 2015 Share Posted January 6, 2015 Temperatures rose from around 0 to 58.9 degrees, with a few 60mph gusts near the foothills. Yup, classic Chinook day. Link to comment Share on other sites More sharing options...
bheberto Posted January 11, 2015 Share Posted January 11, 2015 Yup, classic Chinook day. DIA went from -5 to 55 this day, impressive even for a Chinook event. Link to comment Share on other sites More sharing options...
Sn0waddict Posted January 12, 2015 Share Posted January 12, 2015 DIA went from -5 to 55 this day, impressive even for a Chinook event. http://www.weather5280.com/blog/2015/01/05/chinook-winds-eating-the-snow-away/ 5F at 8AM, 42F at 9:30am. Damn that's awesome. Link to comment Share on other sites More sharing options...
Chinook Posted January 12, 2015 Author Share Posted January 12, 2015 Right now, Fort Collins has very slippery surfaces with freezing drizzle that happened over a few hours overnight. We still have fog and very light freezing drizzle. A few graupel pellets froze onto the layer of frozen drizzle. Some higher snow amounts happened with a stationary snow band around Colorado Springs and the Palmer Divide: 0730 AM SNOW 6 SSW CALHAN 38.95N 104.34W 01/12/2015 M8.1 INCH EL PASO CO TRAINED SPOTTER 0525 AM SNOW 4 W ELLICOTT 38.84N 104.46W 01/12/2015 M7.0 INCH EL PASO CO TRAINED SPOTTER 0720 PM 01/11/15 TO 0525 AM 01/12/15 0100 AM SNOW PETERSON AFB 38.83N 104.70W 01/12/2015 M5.5 INCH EL PASO CO CITY OFFICIAL 1045 PM SNOW 5 NNW PETERSON AFB 38.89N 104.74W 01/11/2015 M5.0 INCH EL PASO CO TRAINED SPOTTER 1029 PM SNOW 4 NW PETERSON AFB 38.88N 104.74W 01/11/2015 M4.5 INCH EL PASO CO TRAINED SPOTTER 1018 PM SNOW 4 WSW FALCON 38.90N 104.68W 01/11/2015 M5.0 INCH EL PASO CO TRAINED SPOTTER Link to comment Share on other sites More sharing options...
frontranger8 Posted January 13, 2015 Share Posted January 13, 2015 I've never seen so many backdoor cold fronts here in my life. For the fourth time in the past 12 days, we're getting light drizzle/flurries, just enough to make everything really icy. Previous three times have all resulted in just Tr-1" snow accumulations. Link to comment Share on other sites More sharing options...
mayjawintastawm Posted January 13, 2015 Share Posted January 13, 2015 In the last 42 hours, the temperature variation at both DIA and Centennial (APA) has been only 9 degrees, from 22 to 31. Likely will extend this substantially if we can avoid any sun before it gets dark. Must be some kind of new Front Range record for dreariness. The Drear Index is about as high as it gets. (proposed equation: ((sky cover in tenths)/10) x (length of time in hours) x 1/(max temp-min temp) * abs(temp(F)-32) ) assuming that 32 F is the maximally dreary temperature Suggestions for incorporating drizzle and/or fog into the equation welcome. I would have added some calculus but forgot how, it's been a while... Link to comment Share on other sites More sharing options...
icebreaker5221 Posted January 14, 2015 Share Posted January 14, 2015 Here's a look at the big picture in terms of snow liquid equivalent. Seems that CO and UT have done ok. The Sierras, Pac NW and high desert SW (think Flagstaff) have all performed terribly so far. Overall a good year for WY and MT, with not too many big storms but many steady light snows associated with frontal passages if I recall correctly. Link to comment Share on other sites More sharing options...
Chinook Posted January 15, 2015 Author Share Posted January 15, 2015 The 13-km GFS ought to be more accurate for mountain precipitation, just basically due to grid size and the grid size of the modeled mountains. Link to comment Share on other sites More sharing options...
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