Marine Weather and Tides
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 7:10AM||Sunset 5:13PM||Monday January 27, 2020 8:43 PM MST (03:43 UTC)||Moonrise 10:04AM||Moonset 9:01PM||Illumination 10%|
7 Day Forecast for Marine Location Near Brighton, COHourly EDIT Help
Area Discussion for - Denver/Boulder, CO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KBOU 272111 AFDBOU
Area Forecast Discussion National Weather Service Denver/Boulder CO 211 PM MST Mon Jan 27 2020
SHORT TERM. (This evening through Tuesday) Issued at 110 PM MST Mon Jan 27 2020
GOES-16 water vapor showing a well defined vorticity maximum moving east-north east across south central Colorado. It's moving at a fairly good clip with a well-defined edge to the upward forcing getting ready to move across the Grand valley in western Colorado. The best synoptic-scale forcing should remain to the south of our area until the far eastern plains when the northern edge skirts southern Washington/northern Lincoln Counties. A frontogenesis band sets up across this area, coincident with the best QG forcing late afternoon into the evening. The HRRR has latched onto this feature and generates about a quarter inch of liquid through midnight across this area. From the Palmer Divide east and northeast out to about Holyoke, and southeast of there should be where the best precipitation occurs. 1-3 inches with the potential for 4 are possible across that area. With road temperatures currently in the mid 40s, wet and temporarily slushy roads are the only expected impacts along this band. Elsewhere, from Denver northward to Wyoming, and north of I-76, precipitation chances are slimmer. There will be a lot of virga and at times wet pavement, but the showers will be hit or miss and shouldn't amount to much QPE. Roads are plenty warm to just remain wet through this evening. Do feel that any precip that falls would be in the form of snow. Best chance is from now through 6 PM. Further east closer to Kansas, precip may stick around until midnight.
In the mountains, the snowfall has been light throughout the day so far after a robust start across the lower elevations of western Colorado. Area web cams continue to show wet roads across the highest mountain passes along and in the vicinity of I-70. Can't rule out a moderate, brief snow shower through about 10 PM as the trough axis moves across the area, but at this point travel impacts should be minor. Additional accumulation of 1-2", maybe 3 are possible until then. Further north across the northern Front Range and Park Range, orographics and moisture is better but lapse rates continue to be poor, and getting poorer with time. This will limit amounts, with the most snow expected across the Rabbit Ears Pass area, with an additional 3-5" possible through around midnight.
By late morning Tuesday the trough is in Oklahoma, and the entire state is under decent subsidence. Skies should clear out and become mostly clear throughout the day, with no precipitation expected. Despite the dry northwest flow, some warm advection will occur throughout the atmospheric column, going from -12 to -7 degC at 700 mb. Thus, highs will be seasonal in the mid to upper 40s across the plains, with 20s to near 30 in the high country. West winds 25G35 mph are possible at and above 10 kft MSL, but light winds across the I-25 corridor should occur throughout the day, with some northwest winds across far eastern Colorado 12G20 mph or so.
LONG TERM. (Tuesday night through Monday) Issued at 110 PM MST Mon Jan 27 2020
No significant adjustments planned in the extended period. The next system will pass mainly to the west and south of the region Wednesday and Wednesday night with weak mid level QG Omega passing over the forecast area. A cold front associated with this system will move across the I25 corridor and northeast plains Wednesday evening, with weak north to northeast post frontal winds in the low levels. In the mountains, 24-hr snowfall totals in the 2-5 inch range. Weak orographic potential Wednesday and Wednesday night as mid level winds will be light with more of a deformation zone over CO. The upper trough will be over central AZ/NM by 00Z Thursday and into old MX by 12z Thursday. Snowfall totals over the foothills and Palmer Divide, should be light with anywhere from a trace to 2 inches. Generally isolated to scattered snow showers across the I25 corridor and adjacent plains Wednesday night with no accumulating snowfall expected. Thursday and Thursday evening, lingering residual moisture and better mid level winds may allow for some light orographic snowfall in the mountains along the higher north/northwest facing slopes but dry elsewhere. Friday through the weekend, it will be dry and warmer as a ridge of high pressure builds over the western U.S. The high temperature in Denver by Sunday could close in on 70 degrees. It will be cooler on Monday with the next storm system expected to drop northwest to southeast across the forecast area Monday night into Tuesday. This system will bring snow to the mountains and could produce light snow to the i-25 corridor and northeast plains as well.
AVIATION. (For the 18Z TAFS through 18Z Tuesday afternoon) Issued at 110 PM MST Mon Jan 27 2020
As expected some light snow is making it to the surface at DEN presently. In general the stronger showers are staying off the the north of DEN, and should continue to stay north and also east of the terminals. APA may also see snow at the ground through 6 or 7 PM, but no accumulation on concrete surfaces is expected with runway temperatures in the mid to upper 40s right now. BJC will likely just see briefly wet pavement through 5 PM. CIGs have been dropping into the lower MVFR category with the showers and virga, but we don't expect flight categories to be any worse than that throughout the evening. Winds should come around to the N and NE through this evening before going SE after 7 PM. VFR conditions should occur after midnight at the terminals, and continue through Tuesday. Winds should be NE after 3 or 4 AM, then north on Tuesday afternoon but speeds should be generally be 10 kts or less.
BOU WATCHES/WARNINGS/ADVISORIES. Winter Weather Advisory until midnight MST tonight for COZ031.
SHORT TERM . Schlatter LONG TERM . Cooper AVIATION . Schlatter
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Denver, Denver International Airport, CO||8 mi||51 min||SSW 6||7.00 mi||Overcast||32°F||30°F||96%||1017 hPa|
|Buckley Air Force Base Airport, CO||15 mi||1.8 hrs||SSE 6||6.00 mi||Fog/Mist||32°F||32°F||100%||1016.9 hPa|
|Erie Municipal Airport, CO||16 mi||44 min||N 0||10.00 mi||Fair||34°F||31°F||91%||1018.3 hPa|
|Denver Nexrad, CO||16 mi||57 min||S 6||10.00 mi||Mostly Cloudy||34°F||32°F||93%||1016.3 hPa|
|Broomfield / Jeffco, CO||19 mi||55 min||SE 3||10.00 mi||Overcast||36°F||32°F||87%||1016.6 hPa|
Link to 5 minute data for KDEN
Wind History from DEN (wind in knots)
|1 day ago||S||SE||SE||SE||SE||S||SW||E||W||Calm||S||SW||S||E||E||E||SE||E||E||E||SE||SE||SE||S|
|2 days ago||SE||S||SW||SW||SW||W||W||SW||W||W||SW||SW||SW||W||Calm||Calm||NE||NE||SW||Calm||SE||SE||SE |
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GEOS Local Image of 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 (22,6,7,8)(on/off)  Help
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