Tuesday, April7, 2020
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Marine Weather and Tides
Calhan, CO

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:31AMSunset 7:29PM Tuesday April 7, 2020 7:08 PM MDT (01:08 UTC) Moonrise 7:11PMMoonset 6:36AM Illumination 100% Phase: Full Moon; Moon at 15 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 072013 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 213 PM MDT Tue Apr 7 2020

SHORT TERM. (This evening through Wednesday) Issued at 201 PM MDT Tue Apr 7 2020

A couple more forecast periods (tonight & tomorrow) with upper ridging over the forecast area and seasonably warm and above normal temperatures. A cold front will make a push through the plains late in the day Wednesday.

Northwest to southeast oriented 500 mb ridging sharpens over the forecast area tonight and Wednesday as the closed low off the southern California coast slowly shifts east. Mid level subsidence and lack of moisture will ensure mostly clear skies overnight tonight, with good radiational cooling in areas that de-couple. Against the foothills expect some warmer pockets where westerly downslope flow provides a little warming.

Wednesday will start off sunny with warming temperatures. However northwest low level flow will turn northerly as a northern stream shortwave trough drops out of southern Canada into the northern plains. This upper trough drags a cold front into the high plains Wednesday, with a push of cooler air into the plains late afternoon. Temperatures will still be able to warm into the upper 60s on the plains by early afternoon, but will struggle against weak cold air advection to match Monday or Tuesday highs. Blended in a little cooler temperatures in northeast Colorado to the National Blend baseline to account for arrival of cooler air. In the mountains above the low level influx of cooler air, temperatures Wednesday will be closer to previous days.

LONG TERM. (Wednesday night through Tuesday) Issued at 201 PM MDT Tue Apr 7 2020

Wednesday night, shallow upslope will usher in a gradual increase in low level moisture overnight. Will keep the slight chance of showers in and near foothills and Palmer Divide, or maybe just some patchy drizzle. On Thursday, a closed upper trough over southern NV will kick out a eject a short wave that will bring some snow to the mountains and foothills late Thursday afternoon and evening. This feature then gets caught up in a deformation zone, with some lingering low level upslope overnight, it then washes out to the southeast by Friday morning. Most of these ingredients are in phase Thursday evening, then decrease overnight. Snowfall totals in the mountains and foothills could range from 2-6 inches, with the higher amounts dependent on how much embedded convection will be present. The best window for this will be around 00z Friday.

Friday into Friday night, the closed upper trough retrogrades into southern NV, with either a weak west to northwest flow aloft over CO. Lingering moisture coupled with afternoon heating should help initiate scattered showers, with mid level lapse rate over 8c/km. Some of these showers will linger into Friday evening. Saturday, the northwesterly flow over CO will increase ahead of the next storm system dropping out of the northern Rockies. Scattered showers will again develop in the afternoon, especially over the mountains.

Saturday night into Sunday, a 90kt upper level jet will nose its way into northwestern CO Saturday night and exit east central CO by 00z Monday. Moderate-Strong mid/upper level QG ascent will drop into northern CO in in the 12-18z period Sunday morning. At the surface, a 1040mb high over the northern Rockies, will push in a strong cold front along with anticyclonic upslope as it drops into the Central Plains on Sunday, with potential 24-hr amounts of 6-12 inches in the mountains and foothills, especially with the presence of any enhanced banding associated with the upper level jet over the region on Sunday. Temperatures on Sunday and Monday will be much colder, with mainly 30s across the urban corridor and northeast plains, but it could even be colder. Certainly cold enough for snow accumulations over portions of the plains too. Temperatures then start to recover by on Tuesday.

AVIATION. (For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 201 PM MDT Tue Apr 7 2020 VFR through the period with mostly clear skies. Northwest wind at all taf sites this afternoon with mixing out, then tonight boundary layer decouples and wind turns more southwest in typical drainage fashion. Wednesday morning overall flow is northwest again, shifting north late in the day with push of cooler air from the north.

FIRE WEATHER. Issued at 201 PM MDT Tue Apr 7 2020

Red flag warning remains in effect until 7pm/01 UTC. Strong winds this afternoon in the northern foothills and along the Wyoming will subside this evening, and RH will recover as air temperature cools. Surface inversion will form after sunset area wide with dispersal becoming poor. Inversion will mix out mid morning Wednesday, with dispersal becoming good. Temperatures a few degrees cooler Wednesday than Tuesday, which will act to increase the relative humidity levels and lessen the fire danger. Wind gusts over 25 mph remain possible over northeast Colorado, and minimum RH during the day 20 to 30 percent will elevate fire danger but keep it out of Red Flag Warning criteria.

BOU WATCHES/WARNINGS/ADVISORIES. Red Flag Warning until 7 PM MDT this evening for COZ238-242-248- 250-251.



SHORT TERM . Hanson LONG TERM . Cooper AVIATION . Hanson FIRE WEATHER . Hanson


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
ELLICOTT-B AFA, CO18 mi70 minWSW 14 G 2110.00 miFair71°F-3°F5%1009.3 hPa

Link to 5 minute data for KABH

Wind History from ABH (wind in knots)
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Last 24hrS10SW11W10N6N3NW4N4NW4NE4W7N3N4CalmN12W6SW12W11
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1 day agoS8S9SW10SW7N3N3CalmN5N3CalmN3NE4S3----W17
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2 days agoE8E12E12E12E13E10E8CalmCalmN3CalmCalmCalmSW9SW8SW8SW8SW13
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S7

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Denver/Boulder, CO (21,6,7,8)
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Ground Weather Radar Station Pueblo, CO
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.