Marine Weather and Tide Forecast for Nunn, CO
February 19, 2025 4:46 AM MST (11:46 UTC) Change Location
![]() | Sunrise 6:46 AM Sunset 5:41 PM Moonrise 1:01 AM Moonset 10:44 AM |

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Area Discussion for Denver/Boulder, CO
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FXUS65 KBOU 191125 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 425 AM MST Wed Feb 19 2025
KEY MESSAGES
- Light snow showers for plains, mountains today. Bitter cold through tonight.
- Another system will bring more snow to the mountains Thursday through Friday with a chance of snow across the rest of the area.
- Warming trend on the plains from Thursday into the weekend.
SHORT TERM /Through Tonight/
Issued at 217 AM MST Wed Feb 19 2025
Light banded snow is ongoing across much of the northern and eastern plains, and will continue much of the morning producing a dusting to 2" of additional accumulation, mainly favoring northern Weld County. QG subsidence will fill in gradually as the upper- level trough pushes into the Midwest, and most areas should be dry by midday today. No changes are planned to the current advisories.
The arctic air mass will retain its firm grip on the region today.
Temperatures early this morning are below zero across large portions of the plains, although so far Denver has managed to avoid approaching its record daily low of -4F. Nonetheless, wind chills in the -10F to -25F are widespread in the plains, and daytime temperatures will bring limited reprieve. Once again, erring on the lower end of forecast guidance with persistent cool northeast flow prevailing through the day, and lowered high temperatures several degrees such that they'll be quite similar to yesterday's values.
Elsewhere, light snow showers will continue for some of the higher mountain elevations, but accumulations will be very light. Tonight will be very cold again, but with slight tapering , with lower potential for the urban corridor to fall below zero.
LONG TERM /Thursday through Tuesday/
Issued at 217 AM MST Wed Feb 19 2025
Thursday morning will be another cold start to the day, although not as cold as Wednesday. The eastern plains will see temperatures in the negatives while DIA and areas west will see single digit numbers. Tightening of the pressure gradients will cause breezy conditions in the morning, plummeting wind chill values from -15 in the eastern plains to 25 below for the far northeastern plains. The cold weather advisory and extreme cold warning will continue through Thursday 11 AM for this reason. The high pressure to our east will settle in the Midwest during the day Thursday. This will create a more southerly/southeasterly flow at the surface which will allow a moderation in temperatures for the day. Temperatures could get up to the mid teens for the far eastern plains, while the rest of the plains could get up to mid 20s. Due to the more southerly downslope flow, Palmer Divide could be slightly warmer (30s) than surrounding areas.
In terms of the next system moving through, an upper level shortwave trough will bring Pacific moisture to the region, bringing another chance for snow in the mountains Thursday afternoon through Friday morning. Recent ensemble models show a significant increase in moisture availability, especially for the Front Range/Vasquez mountains. Moderate to heavy snowfall is expected Thursday evening which would cause some travel impacts for the high country. We could see snow accumulations between 5-8". We will hold off issuing a winter weather advisory until the next round of model guidance comes through to see if moisture availability will increase or decrease.
With northwest flow aloft, frontogenesis and increased moisture availability, the Urban corridor and areas as far east as DIA could see light snow Thursday evening into Friday morning. This could cause slick roads and impact the Thursday evening and Friday morning commute. Snow amounts will be a few inches, with the Palmer Divide and foothills seeing heavier amounts due to favorable northerly upslope flow at the surface.
By Friday evening, we will get a reprieve from all the snow. A prolonged broad ridge will build over the region, bringing dry conditions with it. The high pressure in the Midwest will finally be pushed east, allowing westerly flow at the surface on Saturday. This will allow a gradual warmup for the area as the westerly winds will push the remnants of the arctic air out of our region. Saturday will see slightly above normal temperatures for the day. With downslope flow and the ridge building overhead, Sunday through Tuesday we have the chance to reach up to the 60s across the plains and I-25 corridor.
AVIATION /12Z TAFS through 12Z Wednesday/
Issued at 406 AM MST Tue Feb 18 2025
Scattered MVFR conditions remain in place across the metro, although there's evidence of some thinning and lifting of stratus on satellite and METARs. Since we still have light NE flow in place in most areas, will retain a few more hrs w/ prevailing CIGS 010-018 for Denver area terminals, with a TEMPO group for increased chances of transitioning to VFR conditions after ~15-16Z. Uncertainty in the timing of this is admittedly rather high. By midday and onwards, all terminals are expected to see VFR conditions, which will prevail through the remainder of the TAF period.
Winds will take on a more easterly/southeasterly component this afternoon, and become weaker and more variable later this evening.
BOU WATCHES/WARNINGS/ADVISORIES
Winter Weather Advisory until 5 AM MST early this morning for COZ038-042-044-048.
Cold Weather Advisory until 11 AM MST Thursday for COZ042-044- 046>049.
Extreme Cold Warning until 11 AM MST Thursday for COZ050-051.
Area Forecast Discussion National Weather Service Denver/Boulder CO 425 AM MST Wed Feb 19 2025
KEY MESSAGES
- Light snow showers for plains, mountains today. Bitter cold through tonight.
- Another system will bring more snow to the mountains Thursday through Friday with a chance of snow across the rest of the area.
- Warming trend on the plains from Thursday into the weekend.
SHORT TERM /Through Tonight/
Issued at 217 AM MST Wed Feb 19 2025
Light banded snow is ongoing across much of the northern and eastern plains, and will continue much of the morning producing a dusting to 2" of additional accumulation, mainly favoring northern Weld County. QG subsidence will fill in gradually as the upper- level trough pushes into the Midwest, and most areas should be dry by midday today. No changes are planned to the current advisories.
The arctic air mass will retain its firm grip on the region today.
Temperatures early this morning are below zero across large portions of the plains, although so far Denver has managed to avoid approaching its record daily low of -4F. Nonetheless, wind chills in the -10F to -25F are widespread in the plains, and daytime temperatures will bring limited reprieve. Once again, erring on the lower end of forecast guidance with persistent cool northeast flow prevailing through the day, and lowered high temperatures several degrees such that they'll be quite similar to yesterday's values.
Elsewhere, light snow showers will continue for some of the higher mountain elevations, but accumulations will be very light. Tonight will be very cold again, but with slight tapering , with lower potential for the urban corridor to fall below zero.
LONG TERM /Thursday through Tuesday/
Issued at 217 AM MST Wed Feb 19 2025
Thursday morning will be another cold start to the day, although not as cold as Wednesday. The eastern plains will see temperatures in the negatives while DIA and areas west will see single digit numbers. Tightening of the pressure gradients will cause breezy conditions in the morning, plummeting wind chill values from -15 in the eastern plains to 25 below for the far northeastern plains. The cold weather advisory and extreme cold warning will continue through Thursday 11 AM for this reason. The high pressure to our east will settle in the Midwest during the day Thursday. This will create a more southerly/southeasterly flow at the surface which will allow a moderation in temperatures for the day. Temperatures could get up to the mid teens for the far eastern plains, while the rest of the plains could get up to mid 20s. Due to the more southerly downslope flow, Palmer Divide could be slightly warmer (30s) than surrounding areas.
In terms of the next system moving through, an upper level shortwave trough will bring Pacific moisture to the region, bringing another chance for snow in the mountains Thursday afternoon through Friday morning. Recent ensemble models show a significant increase in moisture availability, especially for the Front Range/Vasquez mountains. Moderate to heavy snowfall is expected Thursday evening which would cause some travel impacts for the high country. We could see snow accumulations between 5-8". We will hold off issuing a winter weather advisory until the next round of model guidance comes through to see if moisture availability will increase or decrease.
With northwest flow aloft, frontogenesis and increased moisture availability, the Urban corridor and areas as far east as DIA could see light snow Thursday evening into Friday morning. This could cause slick roads and impact the Thursday evening and Friday morning commute. Snow amounts will be a few inches, with the Palmer Divide and foothills seeing heavier amounts due to favorable northerly upslope flow at the surface.
By Friday evening, we will get a reprieve from all the snow. A prolonged broad ridge will build over the region, bringing dry conditions with it. The high pressure in the Midwest will finally be pushed east, allowing westerly flow at the surface on Saturday. This will allow a gradual warmup for the area as the westerly winds will push the remnants of the arctic air out of our region. Saturday will see slightly above normal temperatures for the day. With downslope flow and the ridge building overhead, Sunday through Tuesday we have the chance to reach up to the 60s across the plains and I-25 corridor.
AVIATION /12Z TAFS through 12Z Wednesday/
Issued at 406 AM MST Tue Feb 18 2025
Scattered MVFR conditions remain in place across the metro, although there's evidence of some thinning and lifting of stratus on satellite and METARs. Since we still have light NE flow in place in most areas, will retain a few more hrs w/ prevailing CIGS 010-018 for Denver area terminals, with a TEMPO group for increased chances of transitioning to VFR conditions after ~15-16Z. Uncertainty in the timing of this is admittedly rather high. By midday and onwards, all terminals are expected to see VFR conditions, which will prevail through the remainder of the TAF period.
Winds will take on a more easterly/southeasterly component this afternoon, and become weaker and more variable later this evening.
BOU WATCHES/WARNINGS/ADVISORIES
Winter Weather Advisory until 5 AM MST early this morning for COZ038-042-044-048.
Cold Weather Advisory until 11 AM MST Thursday for COZ042-044- 046>049.
Extreme Cold Warning until 11 AM MST Thursday for COZ050-051.
Airport Reports
Link to 1 hour of 5 minute data for KFNL
Terminal Aerodrome Forecast (TAF) for KFNL
Wind History Graph: FNL
(wind in knots)GEOS Local Image of northern rockey
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