Friday, April20, 2018 L-36.com


Marine Weather and Tides
Sheridan, CO

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:12AMSunset 7:45PM Friday April 20, 2018 9:52 PM MDT (03:52 UTC) Moonrise 8:59AMMoonset 11:56PM Illumination 32% Phase: Waxing Crescent; Moon at 6 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 Sheridan, CO
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location: 39.68, -105.06     debug


Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 210129
afdbou
area forecast discussion
national weather service denver boulder co
729 pm mdt Fri apr 20 2018

Update
Issued at 729 pm mdt Fri apr 20 2018
precipitation has been rather disorganized so far. The first
batch of convection this afternoon into early evening was less
than anticipated especially in the mountains. On the plains, there
has been a development of downslope flow from about 9,000 to
12,000 feet msl per kftg vad wind profiler. That has really
squashed the earlier convective development, but there are some
trends showing up of lighter downslope and eventually this will
turn around to weak upslope later this evening into the overnight
early Friday morning hours when more widespread rain snow should
develop across the plains and i-25 corridor. Overall, the
orographic forcing is quite weak with this storm despite the
favorable mid level storm track. Q-g diagnostics also show weak
forcing so overall have cut back on precipitation amounts.

Therefore, the winter storm warning for the mountains has been
downgraded to a winter weather advisory, while snow accumulation
numbers have been cut across the board for the mountains and
foothills.

On the plains, we still see some potential for accumulation in the
grass. In fact, the snow level in the lower elevations has
actually been lower than forecast so far as mid levels cooled and
saturated. It will still be a struggle to get surface wet bulb
temperatures down since there's little evidence of low level
cooling or drying through the rest of this event. However, with
nightfall we should still be able to get a mix or changeover
across the higher elevations and ridges of the plains. Going
forecast looks good there with light accumulations from denver
metro east and southeast toward akron and limon.

Short term (this evening through Saturday)
issued at 1218 pm mdt Fri apr 20 2018
current WV satellite shows the low center spinning over southern
utah with the def zone moving over the central mountains. Another
branch of moisture moved over the eastern portions of the state
bringing isolated thunderstorms and a mix of rain and graupel.

Drying to the south of the vort MAX will pull the system to the se
over northern nm. At this time snow is increasing in coverage and
intensity over park county and will continue to through the
evening hours. Coverage is still expected to increase into the
northern mountains as wind upslope improves through the evening
and overnight hours. At the surface rain is expected to move into
the denver area between 4 and 5 pm and change over to snow around
midnight and continue through the early morning hours.

By Saturday morning the system is expected to push ene across co
with wrap around continuing to bring some rain and snow mix to the
plains and light snow in the mountains that will gradually taper
off. Models indicate another push of snow to the northern
mountains and foothills with increased ene flow Saturday late
afternoon. Overall, did not make any major changes to amounts with
8 to 14 inches over the mountains with the higher elevation
getting close to 16 inches. On the plains areas could see a trace
to an inch on grassy surfaces with a few inches of wet snow
possible over portions of the east. Temperatures started out
warmer in the mid to upper 50s across denver and cooler to the
east but will continue to drop through the day with the
precipitation. Lows will hover around freezing overnight with
upper 40s to low 50s on Saturday.

Long term (Saturday night through Friday)
issued at 1218 pm mdt Fri apr 20 2018
the closed upper low will continue to move eastward away from
colorado Saturday evening with drying and more subsident airmass
settling in behind it.There may still be some lingering showers
over the mountains but any additional accumulations would be
minimal. High pressure ridge aloft will be centered over colorado
by Sunday afternoon with continued dry and warming conditions,
though could still be some showers over the higher mountains with
lingering mountain level moisture. 700mb temperatures rise to
+4c over the front range which will put temperatures back into the
60s across lower elevations.

Next fast moving disturbance and associated cold front will sweep
across northern colorado on Monday night and Tuesday will cooler
temperatures. Best chance of showers will be over the far
northeast plains with some upward ascent noted and possible
thunderstorms Monday evening with some low capes. Stronger
subsident flow develops behind the trof by Tuesday afternoon with
windy conditions on the plains. Could be some showers over east
slopes foothills on Tuesday in post front environment and some
shallow upslope flow creating the showers.

The next fast moving system moves across the state on Thursday
with the next chance of showers, windy conditions and cooler
temperatures. Dry and warmer again by Friday as ridge of high
pressure builds over the region.

Aviation (for the 00z tafs through 00z Saturday evening)
issued at 729 pm mdt Fri apr 20 2018
rain and snow is still expected to develop and become more
widespread late this evening into the overnight hours.

Temperatures should turn just cool enough by 06z-08z for mostly
snow, although if precipitation is lighter then could see a
rain snow mix. Nonetheless, ifr conditions will be developing
through 04-06z with low level flow turning more easterly and more
widespread rain snow developing. Light precipitation may linger
through 15z, and with conditions gradually improving thereafter.

Bou watches warnings advisories
Winter weather advisory until noon mdt Saturday for coz031-
033>036.

Update... Barjenbruch
short term... Bowen
long term... Entrekin
aviation... Barjenbruch dankers


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Denver - Centennial Airport, CO14 mi59 minSSE 14 G 2210.00 miOvercast37°F34°F89%1015.8 hPa
Broomfield / Jeffco, CO16 mi67 minSE 12 G 1710.00 miMostly Cloudy41°F35°F81%1015.9 hPa
Buckley Air Force Base Airport, CO17 mi1.9 hrsSE 1510.00 miOvercast37°F36°F96%1014.2 hPa
Erie Municipal Airport, CO23 mi52 minESE 1210.00 miOvercast42°F33°F73%1017.9 hPa
Denver, Denver International Airport, CO24 mi59 minSE 21 G 287.00 miOvercast and Breezy36°F33°F89%1014.9 hPa

Wind History from APA (wind in knots)
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Last 24hrS15
G24
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S13S8S9S7S6S18
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1 day agoSE7S8S11S15S10SE10SE8SE9SE11S11S17
G23
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G26
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G36
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2 days agoW14
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W15
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NW18
G27
N15
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W7NW6W8NW6SE3334534E7SE8NE9
G17
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G17
E10E7SE6

Tide / Current Tables for
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Weather Map and Satellite Images
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GOES 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.
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Wind Forecast for Denver/Boulder, CO (23,6,7,8)
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Ground Weather Radar Station Denver/Boulder, CO
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Disclaimer:
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.