Thursday, October28, 2021
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Marine Weather and Tides
Calhan, CO

Version 3.4
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3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 7:20AMSunset 6:04PM Thursday October 28, 2021 1:39 PM MDT (19:39 UTC) Moonrise 12:00AMMoonset 2:25PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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 281612 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 1012 AM MDT Thu Oct 28 2021

UPDATE. Issued at 1012 AM MDT Thu Oct 28 2021

Forecast is on track with sunshine across the plains, and gusty winds especially east of the I-25 Corridor. In the mountains, we've made some adjustments, where a shallow moisture layer is trapped by a very stable airmass. Thus, clouds will be slow to break in the high country. In fact, wouldn't be surprised to see mostly cloudy conditions persist through most of the day, before gradually clearing tonight. It appears the moisture is so shallow (and temps warmer than -10C in the moist layer) that we may have a bit of freezing drizzle on the mountains tops. A couple of the cams would also support that, so we've included some light freezing drizzle over the higher peaks into early afternoon, as well as increased the clouds through the day.

Peak wind gusts on the plains may reach 45 mph per looking at the latest cross sections and 40 knots of wind in the mixed layer. Overall, those winds were nudged just slightly higher. Most of the immediate I-25 Urban Corridor should see lighter gusts to around 20-25 mph, while the western suburbs would be protected by a weak anticyclone and even lighter southeasterly winds.

SHORT TERM. (Today and tonight) Issued at 350 AM MDT Thu Oct 28 2021

A strong northwesterly jet is still evident across the region as an upper level ridge slowly builds in. As a result, areas of the plains and higher terrain continue to remain gusty this morning. Dakota Hill recorded a gust of 50 mph around 3:30 this morning. Radar shows light returns in the high mountains indicating scattered snow showers persisting.

An upper level ridge will push into the region today pushing the NW-SE jet max eastward. This will eventually decrease winds into the evening hours. Gusty winds will prevail through the early afternoon hours over the mountains and eastern plains with gusts up to 40 mph possible. The upper level ridge will promote dry conditions across the area today. Model cross sections show moisture to stay in place over the higher terrain in the morning hours which should support chances for lingering light snow showers. Caution should be taken traveling early this morning, especially over the higher mountain passes where roads are snow covered or slick. Rising temperatures throughout the day will reduce impacts. Ridging aloft and mostly sunny skies will promote high temperatures near normal in the 50s/60s across the plains.

LONG TERM. (Friday through Wednesday) Issued at 350 AM MDT Thu Oct 28 2021

Flat upper level ridge will slide east across the Central Rockies Friday. This will bring mild and dry conditions across the area. Cross sections show the airmass will be very dry with very little to no clouds expected. Temperatures will climb into the upper 60s to lower 70s. The ridge slides off to the east Saturday as an upper level trough moves south over the Northern Rockies. A cold front associated with this system will drop south across eastern Colorado during the day. High temperatures for Saturday will be more uncertain because of this. For now, will go with 60s over northeast Colorado. An earlier cold front passage will lead to colder temperatures for Saturday. The colder air will be entrenched over northeast Colorado Sunday. Highs should only be in the 40s. Best chance for precipitation will be Sunday evening and into the overnight hours when a weak trough is expected to move over the region. It should be cold enough that most of the precipitation will fall as snow after sunset.

For next week, still not much run to run model agreement or agreement among the models on the smaller features that will play a big part in our weather. Long wave trough over northeast North America will keep a northwest flow aloft over Colorado. Cooler air is expected to remain over the region. Subtle jet streaks and troughs should bring periods of light snow. For Monday, weak easterly upslope flow will prevail. A trough passing north of Colorado may produce enough lift for rain/snow. Temperatures will remain cool Monday and into Tuesday. For Tuesday, some models are showing a short wave trough moving over the Central Rockies. Will keep PoPs in the forecast for this system. The chance for rain and snow will continue Wednesday with northwest flow aloft expected to prevail. These weak quick moving systems next week should continue to be a challenge for the models to resolve the next few days. Precipitation amounts with these systems are looking light at this time.

AVIATION. (For the 18Z TAFS through 18Z Friday afternoon) Issued at 1012 AM MDT Thu Oct 28 2021

North winds will continue at KDEN through the rest of the day, with gusts to around 20 knots, and perhaps a brief gust or two to 25 knots 18Z-23Z. Winds should weaken and turn northeast/east by 00Z, before quickly rotating to the Southeast and then south/southwest by 04Z. At KBJC, the southeast winds should prevail at least until mid afternoon, and perhaps the whole day with an anticyclone in place. KAPA will likely see north/northeast winds persist before returning to normal southerly winds by 02Z. Skies will be nearly clear, with only a few clouds hanging on the crest of the mountains.

BOU WATCHES/WARNINGS/ADVISORIES. None.

UPDATE . Barjenbruch SHORT TERM . Mensch LONG TERM . Meier AVIATION . Barjenbruch


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
ELLICOTT-B AFA, CO18 mi43 minN 1010.00 miFair50°F19°F29%1025.1 hPa

Link to 5 minute data for KABH

Wind History from ABH (wind in knots)
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Last 24hrN19
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1 day agoSW18
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2 days agoS12S16
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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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