Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Aten, NE

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 7:16AMSunset 6:09PM Wednesday February 20, 2019 11:39 AM CST (17:39 UTC) Moonrise 7:40PMMoonset 8:15AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 201137
afdfsd
area forecast discussion
national weather service sioux falls sd
537 am cst Wed feb 20 2019

Short term (today and tonight)
issued at 413 am cst Wed feb 20 2019
heaviest snow moving through sioux falls at this time, and snowfall
rates within this area are quite impressive, with a distinct change
in snow character as the strongest lift in the dendritic growth zone
moves over the area. Prior to 2 am snow-liquid ratios were averaging
right around 10:1, but the dendritic snows brought a quick 2.3 in hr
with only 0.08" liquid, or nearly 30:1 ratio!
this strongest lift shifts into the far northeast corner of the
forecast area minnesota river valley by 12z, so expect rates to drop
back quickly during the remaining pre-dawn hours. However, because
of the rapid accumulation in that heaviest area, opted to expand the
winter storm warning westward into the i-29 corridor. Based on where
the heavier returns are on radar, along with visibility on web cams
and airport observations, have left the western edge of the advisory
alone, though would not be surprised to see isolated amounts around
or just a little higher than 3 inches into the james river valley.

Also adjusted the end time of the headlines along and south of a
line from sioux falls to storm lake to noon instead of 3 pm, as only
minimal additional snow is expected after noon in these areas.

As far as when it will end, pretty good model consensus depicting a
well-defined back edge lifting northeast as surface boundary swings
winds around to the southwest and west, and this should reach the
missouri river vally by mid morning, khon-kfsd_kslb by noon, and
exit the northeast CWA by 3 pm. Still not looking at much wind,
relatively speaking, but could see some westerly gusts up to around
15-25 mph along and south of i-90 this afternoon, so some drifting
of this powder is certainly possible.

Tonight into Thursday should be rather tranquil, a brief calm before
the next active period which arrives in our far west late Thursday
afternoon. As winds drop off over the fresh snow tonight, should see
lows in the zero to 5 above range for most areas, with localized sub-
zero readings possible. Highs Thursday generally in the upper teens
to mid 20s.

Long term (Thursday through Tuesday)
issued at 413 am cst Wed feb 20 2019
with ongoing weather, did not have a lot of extra time to devote to
deep interrogation of the mid-long range. However, continues to look
like an active pattern, with a prolonged period of snowfall possible
Thursday night into Saturday night as elongated trough sliding out
of the rockies by Friday, begins to intensify as it lifts northeast
toward the mid-mississippi valley this weekend. Could be some precip
type issues in our far southeast as warmer air aloft is wrapped into
northern iowa, but otherwise generally looks like snow for most of
us. Still far too early to have any kind of handle on potential
amounts at this time, as track and intensity are still quite
variable among the models. Unfortunately, stronger winds look to
accompany this system, so will also have to contend with some
blowing and drifting snow as well.

Only a brief reprieve early next week, as broad consensus shows
another, much weaker, wave sliding across the region during the
Monday-Tuesday time frame.

As far as temperatures, should see a brief warm-up ahead of the
late week system, which could bring highs close to or even a little
above freezing for some south of i-90 Friday Saturday. Otherwise
readings remain below normal, with another shot of well-below normal
air returning early next week, with highs 5 to 15 and lows a few
degrees either side of zero.

Aviation (for the 12z tafs through 12z Thursday morning)
issued at 537 am cst Wed feb 20 2019
ifr-vlifr visibility in snow across the region to start the taf
period, with gradual improvement expected southwest to northeast
through 15z to 21z as system lifts out of the region. ExpectVFR
conditions to prevail through the latter half of the forecast
period.

Fsd watches warnings advisories
Sd... Winter weather advisory until noon cst today for sdz060-061-065-
068-069.

Winter storm warning until noon cst today for sdz062-066-067-070-
071.

Winter storm warning until 3 pm cst this afternoon for sdz040-
055-056.

Winter weather advisory until 3 pm cst this afternoon for sdz039-
054.

Mn... Winter storm warning until 3 pm cst this afternoon for mnz071-
072-080-081-089-090-097-098.

Ia... Winter storm warning until noon cst today for iaz001-012-013-
020>022-031-032.

Winter storm warning until 3 pm cst this afternoon for iaz002-
003-014.

Ne... Winter storm warning until noon cst today for nez013-014.

Short term... Jh
long term... Jh
aviation... Jh


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD7 mi44 minSW 87.00 miLight Snow20°F14°F78%1006.9 hPa

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Last 24hrNE6E6E8E8E10E9E7E9E10E12E10E8E10E9E4E6E7E6E3CalmCalmCalmSW6SW8
1 day agoNW10W9NW10NW8NW8NW7NW5W3W3NW4NW3--CalmCalmCalmCalmCalmCalmE4CalmE4E3E5E4
2 days agoNW11NW11NW12NW13NW17NW14NW16NW14NW15--NW14NW12NW15NW11NW12NW11NW14NW14NW16NW16NW13NW10NW11NW12

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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wmap_A
GOES 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 Sioux Falls, SD (12,3,4,5)
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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.