Monday, May20, 2019

Marine Weather and Tides
Raymer (New Raymer), 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 5:36AMSunset 8:14PM Monday May 20, 2019 3:21 PM MDT (21:21 UTC) Moonrise 10:14PMMoonset 7:05AM Illumination 97% Phase: Waning Gibbous; Moon at 17 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 Raymer (New Raymer), CO
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location: 40.66, -104     debug

Area Discussion for - Denver/Boulder, CO
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Fxus65 kbou 202050
area forecast discussion
national weather service denver boulder co
250 pm mdt Mon may 20 2019

Short term (this evening through Tuesday)
issued at 238 pm mdt Mon may 20 2019
the strong upper low which is currently approaching the 4 corners
region this afternoon is providing extensive strong mid and upper
level ascent and diffluence over eastern co. A narrow dry slot over
northern nm and the san luis valley has allowed for some surface
based convection to fire in area of partly cloudy skies and
slightly higher cape. This is being drawn northward into the
central mtns and NE co area early this afternoon. Will expect
northward moving showers to continue into the evening along with
batches of weak to moderate thunderstorms passing across the
higher terrain and onto the urban corridor and plains. Can't rule
out a few stronger storms containing brief moderate to heavy rain
and small hail as they move into a supportive shear environment
with a weak denver cyclone currently in progress. Another area of
convection and lift, closer the upper low near flagstaff az is
still behind this initial convective feature and will likely be
the snow maker and for the mountains and a precip producer for the
lower elevations once it arrives over the central co. The stable
drizzle-like sounding across the plains from this morning
destabilizes to a degree in the mid and upper level for late and
afternoon and tonight, however remains somewhat stable near the
surface due to persistent and fairly deep northeast flow at the
surface. Forecast cross sections and sounding become near
saturated from the surface thru 400mb with lapse rates holding in
the 6.5-7.5 c km range thru the 03z to 12z Tuesday timeframe over
the mountains. Can still expect warning criteria snowfall for the
mountains as we typically see convective generated snowfall this
time of year and especially under this type of synoptic
environment. Snowfall totals of 15 inches plus will not be out of
the question due to persistent showers and possible banding,
especially on south and southwest facing aspects. For the lower
elevations, slow levels still expected to fall near the
5000-5200ft elev as wet bulb 0c levels have come in lower on
current runs. Will add palmer divide to the winter wx advisory
thru noon Tue as 5-10 inches may be possible especially across
the higher western portions of the ridge.

Looking at Tuesday, will be watching for the timing and extent of
drier surface downslope flow pulled off the higher terrain and onto
the lower elevations of the NE plains. By 12z Tuesday, the upper
closed low near the ok panhandle begins a fairly rapid exit out into
nw ks by 18-21z. This will likely bring the beginning of the end to
the best precip across the lower elevations as drying NW downslope
flow fills in behind ejecting low. As upper low exits the region,
nam and GFS swing another trof axis across the CWA from the north
for late afternoon Tue with another brief round of reinforcing cold
air aloft. With this last push of cold air advection aloft this
may keep the snow or snow showers going into early afternoon
Tuesday across the mountains and higher foothills with weak
convective rain mixed with snow showers thru afternoon across the
lower elevations. By late afternoon into early evening tue,
strong QG subsidence begins to work into southern and central
colorado with rapid lowering of rhs across the cwa.

Long term (Tuesday night through Monday)
issued at 238 pm mdt Mon may 20 2019
for Tuesday night into Wednesday, the upper level low will be moving
to the northeast into central ne. A deep surface low will be over
western ks to south-central ne. The wrap around provided by the
cyclonic flow of the surface circulation will keep strong NW flow
moving into the region with high moisture. This will allow for
continued showers over the plains into Wednesday morning and snow in
the higher elevations. Warm air advection Tuesday will change over
cold air advection as winds in the mid levels turn more to the
northwest. Models are showing enough of a cool down in the mid and
lower levels that some snow could mix in with the rain overnight
into early Wednesday across the plains, mainly north near the
wyoming border and the northern foothills. Low temperatures for
Tuesday night will be hovering around the freezing mark with values
from 31 to 34 across the plains. The surface low will continue to
track to the nne through the day Wednesday pulling the energy and
moisture north leaving co in SW flow aloft. Conditions will dry over
the plains with increasing subsidence but there is a slight chance
of storms over the higher terrain with lingering moisture and some
instability present. Highs on Wednesday will rebound slightly with
temperatures in the 50s.

For Thursday, the next upper level disturbance that will affect
colorado will be over utah and is currently forecasted to push north
into wyoming and southern idaho. At the surface, a deepening low
pressure system over the southern portions of the state will move to
the nne pulling in some moisture in the cyclonic sse flow. This
could help to provide high enough dewpoints across the i-76 corridor
for a chance of showers and thunderstorms Thursday afternoon.

Elsewhere, lower chances of convection are possible with a chance
across the higher terrain. Temperatures will continue to increase
with highs projected to be in the lower 60s across the plains and
40s to 50s in the mountains.

Friday and into the weekend, the upper low will continue to push
north into canada leaving colorado in SW flow. Increasing subsidence
from the SW with WAA in the mid levels will help to stabilize the
plains and bring mostly sunny conditions. Temperatures will be
closer to seasonal normals with highs back in the upper 60s to lower
70s with just a slight chance of convection over the mountains. This
warmer and drier pattern will continue into the weekend with highs
back into the 70s under just a slight chance of storms for the

Aviation (for the 18z tafs through 18z Tuesday afternoon)
issued at 238 pm mdt Mon may 20 2019
a strong spring storm system will continue to slowly move east
across the central rockies tonight and Tuesday. Abundant moisture
will continue to bring rain and snow showers along with low clouds.

A weak short-lived thunderstorm or two will also be possible through
02z Tuesday. Ceilings are expected to be 500 to 1500 feet through at
least 18z Tuesday. Rain will occasionally mix with snow under the
heavier showers this afternoon and into the evening. The rain is
expected to change to snow overnight with a up to 3 inches of snow
on grassy surfaces. A light slushy accumulation will also be
possible overnight on paved surfaces. Ceilings are expected to
slowly lift late Tuesday morning, however they are expected to stay
under 4000 feet through 00z Wednesday.

Bou watches warnings advisories
Winter storm warning until midnight mdt Tuesday night for coz031-

Winter weather advisory from 6 pm this evening to noon mdt
Tuesday for coz041.

Winter weather advisory from 6 pm this evening to midnight mdt
Tuesday night for coz036.

Winter storm warning from 6 pm this evening to midnight mdt
Tuesday night for coz035.

Short term... Fredin
long term... Bowen
aviation... Meier

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Greeley, Greeley-Weld County Airport, CO37 mi26 minE 910.00 miLight Rain40°F37°F89%1012.3 hPa

Wind History from GXY (wind in knots)
Last 24hrSE9
1 day ago5NE10
2 days agoN25

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 (17,4,5,8)
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Ground Weather Radar Station Cheyenne, WY
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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 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 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.