Monday, April19, 2021
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Marine Weather and Tides
Calhan, CO

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:14AMSunset 7:41PM Monday April 19, 2021 2:46 PM MDT (20:46 UTC) Moonrise 11:20AMMoonset 1:56AM Illumination 54% Phase: First Quarter Moon; Moon at 8 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Calhan, CO
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location: 38.85, -104     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 192006 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 206 PM MDT Mon Apr 19 2021

SHORT TERM. (This evening through Tuesday) Issued at 206 PM MDT Mon Apr 19 2021

Water vapor satellite imagery showing an upper level trough diving southeast across the Rockies with strong lift over Wyoming and just entering northern Colorado. Lots of ingredients coming together for a quick intense snowfall event through tonight. Strong frontogenesis will track southeast across the area. In addition to this, steep mid level lapse rates, and an easterly upslope low level flow will be in place. Low levels are currently saturated ahead of this lift, so plenty of moisture will be available. Even expect some snow bands due to a speed max moving overhead as well. Put this all together and should see areas of one inch per hour snowfall rates. Under the bands of heavy snow, could see snowfall rates up to 2 inches per hour. Temperatures remained cold behind the front with upper 20s and lower 30s across northeast Colorado. This should allow snow to accumulate more quickly since surfaces will be cold and near freezing. Main impact will be slushy and snow covered due to the cold temperatures, heavy snowfall, and loss of solar insolation. Another impact to watch for is breaking tree branches where heavier snow occurs.

Lows tonight will fall into the teens. If skies clear some, a few record lows will be possible tonight. At KDEN, the record low is 13 and a good chance it is tied or broken if skies clear towards sunrise. Tuesday will be a cold day with snow on the ground and a chilly airmass remaining over the area. Highs are expected to reach the upper 30s to lower 40s over northeast Colorado.

LONG TERM. (Tuesday night through Monday) Issued at 206 PM MDT Mon Apr 19 2021

Unsettled weather will continue through the rest of the work week, with a steady warming trend this weekend.

Tuesday night will start off dry and mostly cloudy under northwest flow. Overnight the flow will shift towards the southwest with gradual warm air advection. Forecast guidance continues to show a narrow band of moisture under a slowly moving deformation zone. Clouds will increase during the day under this regime with snow showers increasing in coverage. Though there is a bit of uncertainty with how much precip falls, models are in good agreement on a good period of QG ascent and mid-level frontogenesis slowly trekking across the area during the day. At least light snow accumulations appear likely for the Foothills and Front Range. Over the urban corridor temperatures are marginal, and combined with a late-April sun angle, it will be difficult to see much in the way of accumulating snowfall.

Thursday will be relatively quiet, except for the chance of some light convective showers across the western side of the continental divide. Another weak system tracks across the area Friday with yet another chance for light rain or snow showers.

The weekend will be much warmer as ridging builds across the western coast. There is a hint of a subtle shortwave on Saturday that could produce some clouds and slight chance of showers, but the real warm day looks to be Sunday. Highs on Saturday should reach the 60s, with 70s possible Sunday. Another system could arrive by early next week.

AVIATION. (For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 206 PM MDT Mon Apr 19 2021

Drizzle and low clouds will persist until snow forms late this afternoon. Snow is expected to form around 22Z with heavy snow 23- 24Z. Snowfall rates of an inch per hour are expected between 00-03Z. If a band of heavy snow moves overhead, snowfall rates may reach two inches per hour. Total snowfall amounts of 3-6 inches are expected at the Denver airports, possibly a little more on the west side of the Denver Metro area. Snow ends around 07-10Z with clearing skies towards 12Z Tuesday. After a clear morning, strato- cumulus clouds are expected to form with ceilings of 5000-7000 feet.

BOU WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory until 3 AM MDT Tuesday for COZ038- 040>046-048>051.

Winter Storm Warning until 3 AM MDT Tuesday for COZ033-035.

Winter Weather Advisory until 3 AM MDT Tuesday for COZ034-036.

Winter Storm Warning until 3 AM MDT Tuesday for COZ039.



SHORT TERM . Meier LONG TERM . Hiris AVIATION . Meier


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
ELLICOTT-B AFA, CO18 mi49 minE 20 G 2410.00 miFair and Breezy42°F27°F56%1015.6 hPa

Link to 5 minute data for KABH

Wind History from ABH (wind in knots)
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Last 24hrN13
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N8N16N14N12NE5CalmN3CalmCalmCalmCalmSW5S7SW7NE3N5N5NW6W6NE20
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1 day agoN11N10
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N20N19N19N16N13N14N9N9N14N12--N10N10N7----N9N12N12------N16

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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