Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Aten, NE

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:27AMSunset 8:26PM Thursday April 27, 2017 1:44 PM CDT (18:44 UTC) Moonrise 6:39AMMoonset 9:02PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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 Aten, NE
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location: 42.87, -97.49     debug


Area Discussion for - Sioux Falls, SD
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Fxus63 kfsd 271145
afdfsd
area forecast discussion
national weather service sioux falls sd
645 am cdt Thu apr 27 2017

Short term (today and tonight)
issued at 357 am cdt Thu apr 27 2017
despite clouds and wind, temperatures on the overnight have been
mainly a few degrees either side of freezing, with most areas at 08z
now subfreezing outside the lower missouri river valley. Clouds
have again started to back westward toward south central sd as lobe
wraps around upper low in northwest mn, and the primary challenge in
the shortest term will be breaking up cloudiness.

Would not be shocked to find a couple of flurries through the early
morning hours mainly across southwest mn where temps in cloud-
bearing levels touch a more likely ice-generation range. Otherwise,
will see quite a few clouds remain through at least mid- to late-
morning across the area, but increasing subsidence should begin to
work on clouds, probably in uneven fashion, by midday and lead to
some decent sunshine during the afternoon for most. Highs should
reach the 40s to lower 50s, warmer than Wednesday, and will probably
feel even better given tendency for winds to gradually ease by this
afternoon.

For most of the area, influence of exiting upper low will be hard to
shake, with perhaps only the immediate missouri river valley feeling
effects of strong jet emerging late night into the central plains.

Sharp mid level ridge axis will maintain a dry trajectory over much
of the area, with the low-level northeast gradient maintaining a
strong dry layer below 700 hpa while some higher clouds spread in
late, which will be hard for precip to breach even by late night.

Have kept a minimal pop southwest of the missouri river across south
central sd and extreme northeast NE very late tonight
temps tonight will again be a concern for those with vegetation of
concern, with readings likely dropping into the mid to upper 20s
near/north of i-90, and subfreezing for most locations north/east of
the missouri river. With less wind, frost will be a more likely
scenario for the coming night, and have introduced into weather
grids for the night. Ongoing temps preclude any need for highlight
on frost/freeze.

Long term (Friday through Wednesday)
issued at 357 am cdt Thu apr 27 2017
the primary concern in the medium and extended portions of the
forecast is the storm system focused on Sunday and Monday. Latest
guidance continues to support high precipitation chances beginning
Saturday night and continuing into Monday, and support an increased
risk of accumulating snow.

Latest model guidance maintains a fairly consistent on the influence
of this storm on the region, however there are some fairly
significant details or differences that are yet to be worked out.

Gfs/ec have both exhibited trends of slowing this system down as it
enters the plains on Sunday, with a bit of a southern jump with the
00z run. This in return pushes the highest precipitation chances
into Sunday night. Secondly, the 00z ECMWF deepens the wave a bit
faster than it's previous run, introducing a stronger warm advection
fetch Sunday night, narrowing the corridor of strongest dynamical
cooling, and pulling a dry slot into NW iowa. No strong preference
on models tonight, and a blended solution only produces minor
differences.

What this all boils down to is an increasing rain risk Saturday
night as initial warm advection and upper divergence spreads into
the region. There may be some initial slowing in precipitation due
to a northerly dry air intrusion, but what this will do is allow
temperatures to begin to fall or stall through Sunday morning.

Through good collaboration tonight, have regionally lowered
temperatures back towards the upper 30s and lower 40s on Sunday.

Temperatures will remain more problematic the further north and west
you travel on Sunday, due to the larger influence of precipitation.

50s could be possible in huron if rain stays southeast.

The biggest forecast concerns fall on Sunday night into Monday as
the main upper trough pivots through the area. With a slowdown in
solutions, the heaviest precipitation will focus itself Sunday
evening, with an elongated and impressive trowal remaining focused
over mn on Monday. Precipitation type remains highly dependent on
the lowest 1000 ft of the atmosphere Sunday night, but confidence
growing that rain will change over to snow across the CWA given
nocturnal cooling of the boundary layer and axis of intense
dynamical cooling aloft. Unfortunately, for those in minnesota, snow
may linger well into Monday as cold air is pulled southward out of
southern canada. Have collaborated a fairly large drop in
temperatures on Monday east of i-29, with blends taken from the
consraw and wpc guidance.

Still far too early to talk about specific snow amounts, given the
synoptic and mesoscale uncertainties in this system, but it may be
time to start talking a bit more about the dreaded late spring
"snow" word.

Slow recovery will take place next week with the continuing
northwest flow. At this point temperatures may try to reach back
towards normal levels, with no meaningful precipitation anticipated.

Aviation (for the 12z tafs through 12z Friday morning)
issued at 642 am cdt Thu apr 27 2017
abundant MVFR ceilings are expected through the morning, but
eventually ceilings should erode from the west and lift to become
vfr during the afternoon, slowest to occur across southwest
minnesota and northwest iowa.VFR conditions will prevail from
this point through 12z fri.

Fsd watches/warnings/advisories
Sd... None.

Mn... None.

Ia... None.

Ne... None.

Short term... Chapman
long term... Dux
aviation... Chapman


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD7 mi49 minNW 9 G 1510.00 miMostly Cloudy43°F28°F57%1006.1 hPa

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Last 24hrNW19
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2 days agoSW10W4NW3SW8SW7S11
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Midwest    EDIT
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Wind Forecast for Sioux Falls, SD (14,3,4,5)
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Ground Weather Radar Station Sioux falls, SD
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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.