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#71
RIC Airport

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I'm guessing that it's because it takes a person to put snowfall data in (as well as measure it- hence why APA and others don't have any snowfall data), but the rest can be completely automated.


If true, that is ridiculous. Most PLCDs have contracted FAA observers recording snowfall and sent to NWS before CLIs are sent. Where is the snowfall measured "for" DEN? Of course it's no longer Stapleton, but if it's there on current DIA property, no reason why it can't be included in the reports. I may just pose the question on their facebook page.

#72
BlizzardWx

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Had a few showers last night with some gusty NW winds but otherwise the stretch of boredom continues. Our little rain/snow event a week and a half ago was the last real item of interest and I see nothing as of right now in the next two weeks.

#73
Chinook

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Yesterday: a couple of wind gusts of 40mph outside of town
Today: I saw frost! a few wind gusts about 30mph

#74
BlizzardWx

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18z and 00z GFS show a dry cold front for me but snow for Colorado even in the lowlands. Very cold out in the plains.

#75
tacoman25

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DEN got all the way down to 26 this morning. 28 in my backyard.

#76
BlizzardWx

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DEN got all the way down to 26 this morning. 28 in my backyard.


I've yet to have a freeze although I have hit 33-36 about 4 times. The ecmwf says that changes next week.

#77
tacoman25

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After trending away from it with the 0z and 6z runs, 12z GFS is back to showing a significant snowstorm here on Wednesday. No consistency beyond 4 days right now, so have to wait and see where it trends from here.

#78
Vandy

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Either way, it looks like we are finally going to get some cold weather next week. I think I may try and get Audubon in this weekend before it gets socked with snow.

#79
icebreaker5221

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Classic upslope snowstorm on today's 12Z. GFS also hanging back A LOT more energy in the trough this time.

#80
tacoman25

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With winter coming and inspired by the International Falls thread, here are some notable cold records for Boulder (I'm using them instead of Denver because Boulder has continuous records in the same general location back to 1893).

Earliest sub-freezing temperature: 9/9/1941

Earliest sub-freezing high: 10/11/2009

Earliest sub-20 temperature: 9/29/1985

Earliest sub-10 temperature: 10/13/1969

Earliest sub-zero temperature: 10/29/1917

Coldest November temperature: -12 11/27/1919

Coldest December temperature: -24 12/22/1990

Coldest January temperature: -33 1/17/1930

Coldest February temperature: -28 2/9/1936

Coldest high temperature: -12 on 2/4/1989

Coldest March temperature: -13 3/9/1932

#81
BlizzardWx

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Still watching those models flip back and forth. At least today's 12 and 18z models all moved toward a colder solution. I am hopeful that both Colorado and Utah can do reasonably well.
As of right now I would be looking at T-2 inches of snow and highs in the upper 30s or low 40s, lows in the mid 20s.

#82
baroclinic_instability

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Still watching those models flip back and forth. At least today's 12 and 18z models all moved toward a colder solution. I am hopeful that both Colorado and Utah can do reasonably well.
As of right now I would be looking at T-2 inches of snow and highs in the upper 30s or low 40s, lows in the mid 20s.


Little surprised the CO guys aren't discussing this a bit more. This is shaping up to be a good early season Front Range snow event.

#83
tacoman25

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Little surprised the CO guys aren't discussing this a bit more. This is shaping up to be a good early season Front Range snow event.


Yeah, baby.



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#84
Vandy

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Little surprised the CO guys aren't discussing this a bit more. This is shaping up to be a good early season Front Range snow event.

Yeah I started paying attention today. It certainly looks promising. The consistency that something will happen is a big plus. Whatever happens, this sure beats last year when we didn't even get a storm to track until the end of the year.

#85
Chinook

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I looked at some of the models yesterday. I didn't particularly notice the breakaway Utah/Colorado shortwave trough. (Although I wasn't looking too closely.) It's possible the models have changed in the last 24 hours. Today the GFS and ECMWF show a robust storm. Actually the GFS shows 41.6mm of precipitation for Fort Collins, which is insane. I got that from the forecast meteograms at http://ready.arl.noa...v/READYcmet.php If that were true, and we got all snow with a 12:1 snow ratio, it would be 19.6 inches of snow. The GFS and ECMWF seem to have some agreement on the Utah/Colorado shortwave, so I think we can certainly expect snow above 6000ft.

#86
RIC Airport

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I live right within the Palmer Divide so this looks to be a great early season event. A good foot would be nice. :D

#87
Chinook

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Winter Storm Watch issued from eastern Wyoming down to the Palmer Divide. Interestingly enough, there is a Red Flag Warning near Colorado Springs, which, I suppose, means they should be watching out for fires. Fires and Snow. Of course. How could we not have fires and snow on the same day?

#88
Vandy

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The NAM has been pretty insistent that the bulk of the precip stays north towards FoCo and Wyoming. Meanwhile the GFS continues to drop the shortwave further south.

#89
tacoman25

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Looking increasingly like the peak of the storm for Denver/Boulder will be about 2 am to 2 pm Wednesday. Earlier it appeared the peak would be more like Tue evening to Wednesday morning. Still looks good for a 4-8" storm for most of the metro area, with higher amounts in the foothills.

#90
A-L-E-K

  • Warmer by the Lake

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:thumbsup:





#91
beavis1729

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With winter coming and inspired by the International Falls thread, here are some notable cold records for Boulder (I'm using them instead of Denver because Boulder has continuous records in the same general location back to 1893).

Earliest sub-freezing temperature: 9/9/1941

Earliest sub-freezing high: 10/11/2009

Earliest sub-20 temperature: 9/29/1985

Earliest sub-10 temperature: 10/13/1969

Earliest sub-zero temperature: 10/29/1917

Coldest November temperature: -12 11/27/1919

Coldest December temperature: -24 12/22/1990

Coldest January temperature: -33 1/17/1930

Coldest February temperature: -28 2/9/1936

Coldest high temperature: -12 on 2/4/1989

Coldest March temperature: -13 3/9/1932


Wow, Boulder has been sub-zero in October...that's crazy.
Colorado climate at its best... :thumbsup:

#92
Thundersnow12

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Both my neighbors go to school in Boulder and Ft. Collins, should be interesting on amounts in both spots.

#93
baroclinic_instability

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This is going to be a biggie. Great low level trajectories for much of the Foothills as well as the Palmer Divide. Some parts near the Divide will easily see 12+.

#94
Vandy

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Lost in all the talk about snow starting tomorrow night is that DIA set a record high today. ;)

#95
tacoman25

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Lost in all the talk about snow starting tomorrow night is that DIA set a record high today. ;)



Boring. ;) And 79 was a weak record, the record from yesterday was 87.

#96
baroclinic_instability

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Gorgeous mountain wave activity today across all of the intermountain W ahead of the leading low ampltitude northern stream shortwave. Mountains waves in the Sierra Nevada, the Laramie Range, Front Range mainly in the Medicine Bows, and the Bighorns of Wyoming. I love mountain wave induced lee cirrus.

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#97
Chinook

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Gorgeous mountain wave activity today across all of the intermountain W ahead of the leading low ampltitude northern stream shortwave. Mountains waves in the Sierra Nevada, the Laramie Range, Front Range mainly in the Medicine Bows, and the Bighorns of Wyoming. I love mountain wave induced lee cirrus.


Gorgeous lenticular clouds

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Now onto the weather discussion.

Here are the QPF values for me:

06z NAM: 31.2mm
12z NAM: 29.9 mm
18z NAM: 31.1 mm

06z GFS: 26.6mm
12z GFS: 31.5mm
18z GFS: 20.1mm

Now, as to the precipitation type. The GFS shows some temperatures above freezing at 800mb. This shouldn't be too much of a problem. Maybe it will mean a couple of those millimeters will be in the form of rain. I'm not sure I want to shovel this much.

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#98
baroclinic_instability

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Great pictures Chinook! Nice trapped wave action. That must have been later in the day after the leading low amplitude shortwave ejected based on the wave mode.

#99
baroclinic_instability

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It is going to be a mess of a commute Thursday morning for the entire Front Range Wednesday morning. IOt is going to be ripping it once you begin upsloping away from the Cheyenne Ridge and the northern Front Range. Foothills/Denver/Palmer Divide going to be a tricky commute. I am envious of you guys.

#100
beavis1729

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Boring. ;) And 79 was a weak record, the record from yesterday was 87.


When Denver hit 80 yesterday afternoon to break the old record high, the dewpoint was -4.

#101
boulderrr

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Looks like I'm near the bull's eye for this one! Perhaps I should pick up a 6-pack of Upslope IPA for tonight.

Posted Image


#102
tacoman25

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It is going to be a mess of a commute Thursday morning for the entire Front Range Wednesday morning. IOt is going to be ripping it once you begin upsloping away from the Cheyenne Ridge and the northern Front Range. Foothills/Denver/Palmer Divide going to be a tricky commute. I am envious of you guys.



NWS going with 6-12" for the city in their winter storm warning now, with higher amounts for the foothills and Palmer Divide.

#103
Chinook

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Great pictures Chinook! Nice trapped wave action. That must have been later in the day after the leading low amplitude shortwave ejected based on the wave mode.


Sometimes the clouds amaze me. The lenticulars and even the little bits of the thin cirrus and other interesting clouds just didn't exist when I lived in Ohio.

#104
Chinook

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UPSLOPE WINDS COMBINING WITH THE
DYNAMICS OF THE UPPER TROUGH ANDJET STREAM WILL CREATE NEARLY
OPTIMAL CONDITIONS FOR SNOW TO FALL FOR SEVERAL HOURS OVERNIGHT.
TEMPERATURES WILL ALSO BE DOWN AROUND THE FREEZING MARK...ALLOWING
SNOW TO BEGIN ACCUMULATING SHORTLY AFTER IT BEGINS TO FALL.
FORECAST SNOW AMOUNTS MAY NEED TO BE BUMPED UP A LITTLE WITH THE
AFTERNOON PACKAGE.


Wow.

#105
boulderrr

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UPSLOPE WINDS COMBINING WITH THE
DYNAMICS OF THE UPPER TROUGH ANDJET STREAM WILL CREATE NEARLY
OPTIMAL CONDITIONS FOR SNOW TO FALL FOR SEVERAL HOURS OVERNIGHT.
TEMPERATURES WILL ALSO BE DOWN AROUND THE FREEZING MARK...ALLOWING
SNOW TO BEGIN ACCUMULATING SHORTLY AFTER IT BEGINS TO FALL.
FORECAST SNOW AMOUNTS MAY NEED TO BE BUMPED UP A LITTLE WITH THE
AFTERNOON PACKAGE.


Wow.


Saw that in their discussion. I'm loving it. Clouds really starting to thicken over and especially north of Boulder. Still 52F with 48% RH, but the wind is out of the NE.

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