huronicane Posted April 28, 2017 Share Posted April 28, 2017 Launched a radiosonde from Louisville this afternoon. Here's the Skew-t. Humidity was 33% at the time of the launch, but it's now around 50%. Link to comment Share on other sites More sharing options...
Chinook Posted April 28, 2017 Author Share Posted April 28, 2017 Update: it is snowing here, temp. is 36, dew point is 35. Link to comment Share on other sites More sharing options...
Chinook Posted April 28, 2017 Author Share Posted April 28, 2017 update: large snowflakes are here! Link to comment Share on other sites More sharing options...
Chinook Posted April 28, 2017 Author Share Posted April 28, 2017 That's about 10x or 20x as much snow as SW Kansas has had all winter Link to comment Share on other sites More sharing options...
mayjawintastawm Posted April 28, 2017 Share Posted April 28, 2017 That band with the reds is just a mile or two south of my house. Will see what it's like shortly. Also the NAM picture you have shows a gradient of 3 to 10 inches (N-S) across Arapahoe County, which is only about 12 miles wide. Link to comment Share on other sites More sharing options...
Chinook Posted April 29, 2017 Author Share Posted April 29, 2017 Fort Collins got about 1" in 1 to 2 hours, and maybe 0.2" to 0.3" of liquid equivalent of rain and snow. Now it is light snow with very small flakes, much smaller compared to our very large 1" aggregated flakes we had. Link to comment Share on other sites More sharing options...
mayjawintastawm Posted April 29, 2017 Share Posted April 29, 2017 Same deal here. Band contracted back to the south, so the northeastern 3/4 of the metro area is getting little at the moment. First couple hours were good though. Link to comment Share on other sites More sharing options...
raindancewx Posted April 29, 2017 Share Posted April 29, 2017 My high tomorrow is supposed to be 39F...which is ~36F below average for the date. Seems like the city has a six hour window for snow from roughly 4 am to 10 am, if we can some wet bulb magic. I'm at 40F with a 34F dew point, with the dew point starting to crater ahead of the next band of precip. One of the forecasters at NWS ABQ wrote on twitter that the upper air sounding was at record cold for the date in Albuquerque. This is all consistent with solar radiation interfering with the upper atmosphere, and then a developing El Nino pushing the interference to the SW. Since 1892, the city has had two days that were <=40F from Apr 15 - Oct 15 - so it'd be a pretty monumental achievement, arguably much more impressive than the snows. Link to comment Share on other sites More sharing options...
Chinook Posted April 29, 2017 Author Share Posted April 29, 2017 It is really snowing in Denver and Colorado Springs Link to comment Share on other sites More sharing options...
mayjawintastawm Posted April 29, 2017 Share Posted April 29, 2017 6.5" on the cardboard box over my roses that I'm using as a snow board for this one. Still coming down good! And the roads are still mostly just wet Link to comment Share on other sites More sharing options...
Chinook Posted April 29, 2017 Author Share Posted April 29, 2017 my area got 0.46" precipitation and maybe around 2.5" to 3.5" total snow. Up to 19" southwest of Denver Link to comment Share on other sites More sharing options...
Chinook Posted April 29, 2017 Author Share Posted April 29, 2017 So far this winter, Dodge City KS has had 5" of snow... now areas west of Dodge City should expect 12" from this storm. Pueblo CO got 12" today, which is more than a third of their annual average snowfall (i.e. 31.8". They are in a valley) Link to comment Share on other sites More sharing options...
raindancewx Posted April 29, 2017 Share Posted April 29, 2017 Albuquerque (sunport) at around 7 am. Was asleep, and they haven't put out the snow total yet, but maybe 0.1" -0.5"? Fourth latest snow at the airport on record since 1931. https://pbs.twimg.com/media/C-mNM1FVoAAgaUa.jpg:large Link to comment Share on other sites More sharing options...
Chinook Posted April 29, 2017 Author Share Posted April 29, 2017 Some snowy maples. It's not supposed to snow this hard when there are leaves! Link to comment Share on other sites More sharing options...
Coach McGuirk Posted April 30, 2017 Share Posted April 30, 2017 I'm curious to see the final snow total. Link to comment Share on other sites More sharing options...
Chinook Posted April 30, 2017 Author Share Posted April 30, 2017 looks like it has been about 2 to 10" in the Denver area under 7000ft. Huge range there. Pueblo area was very snowy-- Pueblo is usually too far south for significant snow. Link to comment Share on other sites More sharing options...
Coach McGuirk Posted April 30, 2017 Share Posted April 30, 2017 19 minutes ago, Chinook said: looks like it has been about 2 to 10" in the Denver area under 7000ft. Huge range there. Pueblo area was very snowy-- Pueblo is usually too far south for significant snow. Well, seems like we always get these elevation based snowstorms late in the season. Link to comment Share on other sites More sharing options...
mayjawintastawm Posted April 30, 2017 Share Posted April 30, 2017 9" for a final here just north of Centennial at 5650 ft. Wouldn't have believed it for a minute till yesterday midday. Just kept creeping up all day. Finally done and the moon is out. Link to comment Share on other sites More sharing options...
Chinook Posted April 30, 2017 Author Share Posted April 30, 2017 It is snowing heavily in Kansas. Colby KS is up to a whopping 17" now but there are much lower snow reports within 60 miles of there. Link to comment Share on other sites More sharing options...
raindancewx Posted April 30, 2017 Share Posted April 30, 2017 There were places in NM that got 1-2 feet at relatively low elevations east of the central mountain range. Areas outside Tijeras had 16" (20 miles east of ABQ, maybe 5800 feet?) Link to comment Share on other sites More sharing options...
mayjawintastawm Posted May 3, 2017 Share Posted May 3, 2017 Just to document what might be the last snow this season, big wet flakes and 35 F this AM. Nothing sticking. Link to comment Share on other sites More sharing options...
raindancewx Posted May 4, 2017 Share Posted May 4, 2017 ONI value for Nino 3.4 in FMA came in: +0.1C. Up from -0.4C in DJF. Link to comment Share on other sites More sharing options...
Chinook Posted May 5, 2017 Author Share Posted May 5, 2017 Colorado is likely to be wet (and slightly snowy) in the next couple of weeks, according to GFS/GEFS, and maybe even wet on week 3 if you look at the CFS weekly chart. The Fort Collins area has been taken out of D1 drought, on yesterday's US Drought Monitor. We were not above 70 degrees between 4/19 and 5/4, so a lot of this moisture has had some time to sink into the soil with lower evaporation. We had 0.14" of rain Tuesday-Wednesday. Link to comment Share on other sites More sharing options...
Chinook Posted May 6, 2017 Author Share Posted May 6, 2017 North America and Europe have been, on average, fairly cold in these last 2 weeks. A predominantly negative AO index, FTC (for the cold). You don't always see large NAO/AO connections at this time of year. Link to comment Share on other sites More sharing options...
Amped Posted May 7, 2017 Share Posted May 7, 2017 Quote .Central/southern High Plains and Front Range... The aforementioned upslope flow will serve to advect a relatively moist air mass (45-50 degrees F surface dewpoints) into northeast CO during the afternoon. Strong surface heating over the High Plains from CO south into southeastern NM/Far West TX will contribute to moderate buoyancy by late afternoon (1000-1500 J/kg SBCAPE). Moderate mid- to high-level southerly flow on the periphery of the central U.S. ridge atop southeasterly and easterly low-level flow will result in effective shear 25-40 kt---sufficient for organized storms. Orographic forcing for ascent and perhaps a weak mid-level impulse will combine with weakening CINH during the day to result in isolated to scattered storms by late afternoon/early evening. Organized multicells capable of a wind/hail threat are possible near the lee trough/dryline and several supercells are possible early in the convective lifecycle where stronger deep-layer shear is forecast (i.e., a stronger easterly component to low-level flow). A spatially confined tornado risk may develop over northeast CO and perhaps preferentially favor near the Palmer Divide or near the Front Range. Forecast soundings show very steep lapse rate profiles supportive of severe gust potential. The wind risk is forecast to increase during the transition to more-outflow-dominant convective structures with this risk decreasing during the evening. Interesting setup for the front range. Good place to chance too, if you don't get a tornado you'll probably see accumulating hail. Link to comment Share on other sites More sharing options...
Chinook Posted May 8, 2017 Author Share Posted May 8, 2017 This is the first slight risk for a large part of eastern Colorado. It is at a typical time of the year for the first slight risk. Yesterday, Denver had a gust of 60mph from a thunderstorm. Some other areas had about 45mph. I had some windy conditions in Fort Collins, 35 kt at KFNL, but I never heard thunder. Today, CAPE values around 2000 J/kg + mean that all modes of severe weather are possible in eastern Colorado. Shear values are highly dependent on which model you look at. So that is rather confusing. The HRRR runs say that this area will be very wet tonight. The model doesn't have intense storm cores or updraft helicity. Link to comment Share on other sites More sharing options...
Amped Posted May 9, 2017 Share Posted May 9, 2017 Denver hail storms never disappoint. http://ftw.usatoday.com/2017/05/massive-hail-storm-denver-coors-field-rockies-cubs-covered-mlb Link to comment Share on other sites More sharing options...
Chinook Posted May 9, 2017 Author Share Posted May 9, 2017 First thunder of the year! We had a downpour at about 3:00 or 3:30. At about 6:20, the composite radar for the region looked like a question mark. Link to comment Share on other sites More sharing options...
yotaman Posted May 9, 2017 Share Posted May 9, 2017 I have a facebook friend in Denver and she posted that she got lots of damage in her area from golfball sized hail. Link to comment Share on other sites More sharing options...
Chinook Posted May 9, 2017 Author Share Posted May 9, 2017 There was a picture on twitter of somebody who had house windows broken from hail in the Denver area. That's nasty stuff! Link to comment Share on other sites More sharing options...
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