Thursday, September16, 2021
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Marine Weather and Tides
Nunn, CO

Version 3.4
NOTICE
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 6:41AMSunset 7:08PM Thursday September 16, 2021 4:44 AM MDT (10:44 UTC) Moonrise 5:15PMMoonset 1:36AM Illumination 74% Phase: Waxing Gibbous; Moon at 10 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 160917 AFDBOU

Area Forecast Discussion National Weather Service Denver/Boulder CO 317 AM MDT Thu Sep 16 2021

SHORT TERM. (Today and tonight) Issued at 257 AM MDT Thu Sep 16 2021

The upper level ridge over Colorado will slide east of the state as an upper level trough drops south into the Northern Rockies. A west- southwest flow aloft will bring another warm and dry day. Airmass warms a couple degrees which should put most locations into the lower 90s over northeast Colorado. An increase in mid level moisture should lead to an increase in cumulus clouds today. Could see mostly cloudy skies at times mid to late afternoon. Flow aloft will also increase, which will lead to stronger winds over the mountains and mountain valleys today where gusts to 35 mph will be possible. A cold front will drop south across Colorado late this evening and early overnight hours. Could be enough moisture and instability for storms over the far northeast corner of the state. Will have 20-30 PoPs here and keep else where dry. Gusty north winds to 40 mph will be possible behind the front. By sunrise, low clouds will be over parts of the plains and possibly as far west as the foothills.

LONG TERM. (Friday through Wednesday) Issued at 257 AM MDT Thu Sep 16 2021

Northern Colorado will be under a post frontal regime on Friday with cooler temperatures and low clouds across the plains during the morning. Moisture is quite shallow along with strong low level inversion, so no showers or thunderstorms expected. Temperatures Friday afternoon will only be in the 70s across lower elevations.

Over the weekend, high pressure ridge aloft will dominate the weather picture with a moderate westerly flow aloft. Airmass will be initially dry on Saturday along with warmer temperatures again. Lower elevations expected to bounce back into the upper 80s and lower 90s. NAM forecast soundings indicate some return of mid level moisture by Saturday afternoon which could spark a few high based showers, especially in the mountains. Some of this moisture will be streaming northward into Colorado ahead of next weak trof moving into the southern Great Basin. Expect similar conditions on Sunday with very warm temperatures and isolated high based showers during the day.

A more impressive wave will sweep across the Northern Rocky mountain region but only brush Colorado with wind and cooler temperatures. The brunt of the energy and moisture will stay well north of Colorado with only a chance of showers over the Northern mountains and possibly a slight chance across the plains. Will at least see a strong cold front with cooler temperatures on Monday. 700mb temperatures expected to drop to almost +5c at Denver with resulting high temperatures only in the 70s. Cross sections showing decent mountain top winds of 30-40kt and expected gusts in the 50-60 mph range would be possible.

Tuesday and Wednesday will see more dry conditons as Colorado remains under a moderate west to northwest flow aloft. Temperatures though are still expected to remain a bit below seasonal normals.

There is less certainty in the Thursday and Friday time frame as the long range models diverge significantly in handling the next storm system as it drops into the Great Basin. The GFS is the most progressive while the European solution drops the upper low southward and into Utah and Arizona. The Canadian solution is off in its own world as takes the low off the West Coast to meander aimlessly. Anyway, all this is way out there in time and expect a number of solution diversions each day.

AVIATION. (For the 06Z TAFS through 06Z Thursday night) Issued at 257 AM MDT Thu Sep 16 2021

VFR conditions will prevail through this evening, 06Z Friday. Mid and high clouds will form this afternoon with ceilings above 10,000 feet. A cold front will bring a strong wind shift to the north around 06Z with gusts to 35 knots possible. Low clouds are expected behind the front towards 12Z Friday with ceilings around 2000 feet. Other than the gusty north winds with the front tonight, mainly light winds are expected for the Denver airports.

FIRE WEATHER. Issued at 257 AM MDT Thu Sep 16 2021

An increase in the flow aloft will bring stronger winds today with gusts to 35 mph possible this afternoon over north central Colorado. This combined with warm temperatures and relative humidities falling into the 10 to 15 percent will lead to Red Flag conditions this afternoon over the north central mountains and mountain valleys.

Will continue the fire weather watch for Friday afternoon across much of the mountains with continued high fire danger. Appears the brunt of the fire danger will be across Jackson and Grand counties where the strongest wind potential will exist. Still elevated fire danger this weekend but humidities will be a little higher over the mountains.

HYDROLOGY. Issued at 257 AM MDT Thu Sep 16 2021

Dry conditions expected through Friday, then just a slight chance for afternoon showers this weekend and through Monday. However, any flash flood threat will be very low due to limited moisture and instability.

BOU WATCHES/WARNINGS/ADVISORIES. Red Flag Warning from noon today to 7 PM MDT this evening for COZ211-213-217-218.

Fire Weather Watch from Friday afternoon through Friday evening for COZ211>214-217-218.



SHORT TERM . Meier LONG TERM . Entrekin AVIATION . Meier FIRE WEATHER . Entrekin/Meier HYDROLOGY . Entrekin/Meier


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Collins/Loveland - Northern Colorado Regional Airport, CO16 mi49 minWSW 310.00 miFair59°F41°F51%1006.2 hPa
Greeley, Greeley-Weld County Airport, CO21 mi49 minN 010.00 miFair48°F42°F80%1008.9 hPa

Link to 5 minute data for KFNL

Wind History from FNL (wind in knots)
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Last 24hrNE4CalmCalmCalmSE4SW4Calm35E9
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E9E9S8SE4CalmCalmSW3NW33CalmCalmSE3SW3
1 day agoS15S8S6S6N15NE11NE10NE8455SW7SE73S4E3SE7E8E4NE3CalmCalmNW6N5
2 days agoNE5NW4N3N19
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5SW9S11SE8S9E8E10E11N6SW4N4NE3NW3S6SW7

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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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