Wednesday, January29, 2020
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Marine Weather and Tides
Nunn, 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 7:11AMSunset 5:15PM Wednesday January 29, 2020 5:30 AM MST (12:30 UTC) Moonrise 10:57AMMoonset 10:57PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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 Nunn, CO
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location: 40.66, -104.88     debug


Area Discussion for - Denver/Boulder, CO
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FXUS65 KBOU 291051 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 351 AM MST Wed Jan 29 2020

SHORT TERM. (Today and tonight) Issued at 355 AM MST Wed Jan 29 2020

The short wave trough that is expected to produce today's weather is deepening over Utah and northern Arizona this morning, with a shield of clouds and precipitation spreading downstream, over Colorado. Radar data from the Western Slope has shown light snowfall from the Grand Junction area to Vail Pass all morning. Some weak echoes have also began to show up over the mountains west of Denver over the past hour. North central and northeast Colorado are going to remain on the northeast fringe of the short wave trough as it continues to dig southward over Arizona. However, the short range models continue to show areas of light snowfall today and this evening over the mountains and adjacent plains. Park and Summit Counties stand to receive the best snowfall amounts, since they are closest to the upper level storm system. But even these areas are only expected to get accumulations of a few inches. Further north and locations on the plains will see an inch or less. In the end, the best dynamic forcing with this storm is well to the southwest of our forecast area.

Cloud cover over the mountains and northeast plains will be persistent which will help to keep temperatures cool, only in the lower 40s across the plains. A weak cold front with light northerly winds behind it will also keep temperatures from warming. Later tonight, clouds and precipitation will decrease as the storm system over Arizona tracks eastward, well to our south.

LONG TERM. (Thursday through Tuesday) Issued at 325 AM MST Wed Jan 29 2020

For Thursday, an upper trough will be positioned well southwest of the state with upper level flow predominately from the north to northeast. A weak shortwave will push through the morning hours on Thursday bringing light snow to the mountains into early Friday morning. Moisture is fairly limited until Thursday late afternoon and into the early evening hours with weak orographics from the northwest. The moisture is somewhat shallow outside of a few hours and pushes out quickly so there is not high confidence in much accumulation with this disturbance. At this time the higher elevations of the northern and central mountains could see 1 to 3 inches by Friday morning. Across the lower elevations, conditions will remain dry minus areas across the southern foothills into the Palmer divide and into south and southeastern Denver with the northerly flow aiding in some orographic light snow overnight Thursday. Accumulations will be little to none over most areas with a trace to an inch across the Palmer and Monument hill areas. Highs on Thursday will be in the 30s to 40s for the plains and teens to 20s in the mountains.

A broad upper level ridge will build into the region on Friday and bring warm and dry conditions through Saturday. Temperatures will increase with 700 mb charts showing +5 C by Saturday. Highs in the lower 50s on Friday will increase into the 60s on Saturday under mostly sunny conditions.

For Sunday through Tuesday a system is starting to develop that could potentially bring accumulating snow to all areas. Model consistency is improving with the latest 00z run, however there are still large discrepancies between the EC and GFS. Some of these differences begin as early as Sunday with the GFS pushing a cold front through during the afternoon and early evening with the main piece of energy still over NV. The EC has the trough centered over CA on Sunday with 700mb temperatures reaching up to +6-7C under continued ridging bringing highs possibly into the lower 70s. The GFS tells a different story with the post frontal airmass registering in the 50s for Sunday. The trough itself is faster in the GFS and Canadian than the EC beginning snowfall potential as early as Monday morning. The upper low continues to move into the four corners region through the day Monday before finally closing off. The GFS is deeper with a more pronounced upslope signature across the eastern plains. The EC brings the cold frontal push through by the late afternoon/evening hours Monday increasing snowfall potential for the region into Tuesday. Temperatures will finally come more in line by Tuesday with highs projected to not get above freezing and lows potentially in the single digits Tuesday night. With the consistency the EC has shown over the last two runs, will lean more toward that solution. Overall, there is still quite a bit of inconsistency with this next system but the points to focus on is the energy associated with the well-placed closed low and projected path as well as the moisture and increased NE surface wind potential on the plains that could result in snow for the beginning of Feb.

AVIATION. (For the 12Z TAFS through 12Z Thursday morning) Issued at 355 AM MST Wed Jan 29 2020

The primary aviation impact today will be lowering ceilings through the afternoon. Surface and low level winds will be out of the north to northeast by this afternoon which will combine with increasing moisture levels to produce ceilings as low as 2000 to 3000 feet AGL after about 1 PM. Areas of light snow may also develop during the late afternoon and early evening. Visibilities could drop to the 3 to 5 mile range in the vicinity of snow showers. Any snow accumulations will be less than an inch. Areas of precipitation are expected to be moving out of the area by 9 PM and ceilings should be at or above 6000 feet AGL by midnight.

BOU WATCHES/WARNINGS/ADVISORIES. None.

SHORT TERM . Dankers LONG TERM . Bowen AVIATION . Dankers


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO16 mi35 minN 010.00 miA Few Clouds29°F19°F69%1017.2 hPa
Greeley, Greeley-Weld County Airport, CO21 mi35 minN 010.00 miFair28°F24°F85%1019.6 hPa

Link to 5 minute data for KFNL

Wind History from FNL (wind in knots)
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Last 24hrNE11NE8W5W4SW6S8S8S8S8S7S7S7S5SW5SW3E6NE5NW4CalmNW3N4CalmNE4Calm
1 day agoNE7N8NE7NE6NE6E43CalmSE5CalmCalmCalm--S4SW3NW12NW7NW10N9N11NE10N13N13N15
2 days agoSW3S5S3S3S4SW6S7SE9S8S5CalmSE3SE4SW3S3W4CalmNE5NE6N6N7N4N4N5

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of CentralPlains    EDIT
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 (7,2,3,4)
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Ground Weather Radar Station Cheyenne, WY
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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.