Tuesday, December18, 2018 L-36.com

Marine Weather and Tides
Foxfield, CO

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:13AMSunset 4:39PM Tuesday December 18, 2018 4:17 AM MST (11:17 UTC) Moonrise 3:04PMMoonset 3:32AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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 Foxfield, CO
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location: 39.64, -104.8     debug

Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 181051
area forecast discussion
national weather service denver boulder co
351 am mst Tue dec 18 2018

Short term (today and tonight)
issued at 345 am mst Tue dec 18 2018
clearing is now underway with the departing weakly organized
shortwave trough. Strengthening mid-level subsidence in its wake
should produce clear to partly cloudy skies east of the mtns by
this afternoon. Whereas, the weak sfc winds on the plains this
morning are expected to increase this afternoon, particularly
east of a cheyenne-to-limon line with the 20-25kt 700mb northwest
flow mixing down during MAX heating. Could see gusts in the 20-25
mph range develop east of this line. Fortunately, with slightly
cooler temperatures and gradually rising sfc dewpoints through the
day, the wildland fire danger out there should be held at bay.

For the high country, a strengthening mtn top stable layer will
trap low-level moisture up against the windward slopes, probably
keeping skies partly to mostly cloudy all day up there. This low
cloud cover will have a negative impact on valley floor temps,
holding daytime readings to the low mid 30s. However, do not see
any precip falling from this shallow cloud deck.

Overnight, cloud cover in the high country should quickly
increase and deepen through the evening as the left exit region
of a 130-145kt jet curves southeast towards the northwest corner
of the state. However, model QG fields indicate negative to
neutral large scale ascent over the high country tonight,
apparently due to modest warming above 500mbs. With that said,
once these clouds begin precipitating during the evening, snowfall
rates are likely to be on the low side, although there may be
pockets of moderate snowfall such as in the park, gore and
medicine bow ranges where northwest flow will concentrate the low-
level moisture streaming into the area. Other mtn areas should
still see snowfall tonight mainly on the ridgetops and windward
slopes, but snow amounts will be lighter here. High country snow
totals by morning will range from 2-5 inches, with generally an
inch or less on the valley floors and front range foothills.

Furthermore, strong northwest winds may produce areas of blowing
snow late tonight creating difficult travel conditions, mainly on
the higher passes such as rabbit ears, cameron and berthoud
passes. At this time, will refrain from hoisting a winter weather
advisory due to the limited impact area, low snow amounts and
short duration of these condition. Elsewhere, should see a steady
increase in wind speeds overnight with the downward displacement
of the strengthening momentum aloft. Could get a bit gusty at the
base of the foothills late tonight, with possible gusts to 30
mph. Otherwise, it will remain dry on the plains, but mid-level
cloud cover will be on the increase which will keep overnight
temperatures on the mild side.

Long term (Wednesday through Monday)
issued at 345 am mst Tue dec 18 2018
main concern will be during the day on Wednesday with the main
threat of high winds on the plains and a combination of light snow
and winds in the mountains. Upper trof will move across the state
early Wednesday with increasing subsident flow along with strong
140kt jet oriented northwest to southeast across eastern colorado
by Wednesday afternoon. Cross barrier flow increasing to 40-50kt
by 12z Wednesday but moisture depth over the mountains and
approaching jet MAX will limit the amount of mountain wave
amplification over the front range. Certainly some gusts in the
50-60 mph range but don't expect high winds in the mountains given
the above scenario. For mountain snowfall, moisture depth
decreases by later in the morning but steepening lapse rates and
modest orographic flow would result in another 1-4 inches of
additional snowfall.

As for the plains, there is some subsidence, but QG fields
showing only around +10mb hr which is not all that great to bring
down the stronger winds to the surface. Overall GFS wind fields
are stronger with this event than the NAM and certainly could get
close to high wind criteria on the plains. This looks like a
borderline high wind event so for now will leave the high wind
watch in place. Surface gradient does tighten to around +10mb from
gjt to den so certainly a tight enough gradient would exist for
the high wind potential. Latest hi resolution models showing
gusts up to around 45kt on the plains through 21z.

High pressure aloft will build over the region on Thursday with
slowly decreasing northwest flow aloft and drying airmass. Next
weak upper trof will rapidly move across the state late Friday
with a brief shot of snow in the mountains and more wind across
the plains for late Friday afternoon and night. Yet another
rapidly moving system poised to move across the state on Saturday
with a chance of snow in the mountains but mainly dry and windy on
the plains.

Confidence in model solutions from Sunday through christmas
decreases as there is a multitude of solutions as canadian gfs
solutions would result in generally dry conditions for colorado while
the european results show a trof with snow potential for the
mountains on Sunday and Monday. For now will just indicate a
slight chance for snow in the mountains.

Aviation (for the 06z tafs through 06z Tuesday night)
issued at 345 am mst Tue dec 18 2018
plan onVFR conditions at denver area airports during the next 24
hours. Skies gradually clear today, only to fill with mid-level
cloud overnight. Light southerly winds this morning should go
light and variable by early afternoon. Then overnight, winds turn
westerly at 7-12 kts, with stronger gusts to around 25 kts near
the base of the foothills, such as at kbjc, after midnight.

Bou watches warnings advisories
High wind watch from Wednesday morning through Wednesday
afternoon for coz038-042>049.

Short term... Baker
long term... Entrekin
aviation... Baker

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver - Centennial Airport, CO6 mi25 minN 010.00 miMostly Cloudy35°F17°F48%1013.9 hPa
Buckley Air Force Base Airport, CO7 mi80 minS 710.00 miMostly Cloudy42°F15°F33%1011.9 hPa
Denver, Denver International Airport, CO16 mi25 minSSW 1010.00 miMostly Cloudy38°F16°F41%1012.1 hPa
Denver Nexrad, CO17 mi24 minSSW 510.00 miFair35°F15°F46%1014.9 hPa

Wind History from APA (wind in knots)
Last 24hrCalmSW4SW9SW5SW3SW9W6NW43N6N5N53CalmCalmCalmCalmS3W3S4S3S4S3Calm
1 day agoE7S6S6SE6SE4Calm363SE5E45S6S4W6S6S6SE5S6S5S9S7CalmS4
2 days agoCalmSW3S5SE6CalmS5SW8N8E3SE4SE5S7S5S7S6S8SE4SE3S5S4CalmNW6SW7S5

Tide / Current Tables for
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Weather Map and Satellite Images
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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.
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Wind Forecast for Denver/Boulder, CO (6,6,7,8)
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Ground Weather Radar Station Denver/Boulder, CO
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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 numerious 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.