Friday, March24, 2017 L-36.com


Marine Weather and Tides
Yankton, SD

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 7:19AMSunset 7:46PM Friday March 24, 2017 9:09 AM CDT (14:09 UTC) Moonrise 4:33AMMoonset 3:08PM Illumination 10% Phase: Waning Crescent; Moon at 27 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
    EDIT      (on/off)   Help
7 Day Forecast for Marine Location Near Yankton, SD
   Hourly   EDIT   Help
location: 42.89, -97.39     debug


Area Discussion for - Sioux Falls, SD
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kfsd 241126
afdfsd
area forecast discussion
national weather service sioux falls sd
626 am cdt Fri mar 24 2017

Short term (today and tonight)
issued at 259 am cdt Fri mar 24 2017
rain continues to pivot across the CWA early this morning. Axis of
precipitation has narrowed and shifted slightly further south since
midnight, as a weakening MCV works across eastern nebraska and into
northwest iowa. Instability has really waned as expected after
midnight, with observed lightning down to minimal values. Radar
estimating upwards of 1 to 2" along an axis from vermillion
northeast through sioux center, which seems match reasonably well
with observations.

Today: concentrated areas of moderate rains will continue to pivot
northeast through this morning as shortwave/mcv pulls away from
the area. Best guidance overnight has been the gfs, namnest, with
slight input from the hrrrs. That said, all guidance has been
about 25-50 miles too far to the north. Guidance is hinting at a
relative break in any steady rainfall through the late morning and
early afternoon hours as upper lift really weakens and shifts
eastward. Increasing flow of slightly drier air in the low-
levels from the north will work to really narrow the deformation
band later this afternoon as the larger upper trough ejects
eastward. Thus, have pulled pops further south, and really tried
to narrow up the northern pop gradient. Increasing dynamics
should aid in developing renewed light to moderate rain with a low
end risk of an isolated rumble of thunder, mainly along a line
from vermillion to storm lake.

Tonight: steady shower activity should remain in place for the
southern zones of the CWA from vermillion to storm lake into
Saturday morning. Further north, stratus that never really leaves
the area, will try to expand through the night, with indications
that, especially along the edges, fog may try to develop as stratus
lowers.

Long term (Saturday through Thursday)
issued at 259 am cdt Fri mar 24 2017
Saturday: the large upper low will slowly pivot eastward into the
mississippi river valley through the day. However, low level flow
from the east will only work to maintain an increased rh field over
the eastern half of the CWA through the day. Would not be surprised
to see a few spits of rain or even drizzle east of i-29 for much of
the day.

Sunday: a kicker wave moving through the central rockies will
finally provide enough of a push to nudge the upper low eastward
into the great lakes on Sunday. Flow in general over the area is
rather weak and disorganized, which may only serve to keep clouds
and a produce a few spits of rain during the day. Temperatures
Sunday will climb near or into the lower 50s.

Monday-Friday: a fairly energetic flow pattern persists through
next week, with medium and extended models continuing their
disagreements in solutions. Edging towards dry conditions for
Monday-Tuesday as favored by the gfs, and a stronger influence
from brief mid-level ridging and dry northeastern flow from
surface high pressure in manitoba.

The most uncertainty and lowest forecast confidence develops from
Wednesday through Friday. Still significant differences in the
track and depth of an upper trough expected to cross through the
four corners region into the southern plains. GFS remains stronger
and further south, with less influence to the local area, while
ecmwf is weaker, more phased with northern stream energy and does
provide at least a glancing blow of light precipitation for
Wednesday and Thursday. The gem and the GEFS support the gfs
deterministic soln, and have tried to trend the forecast towards a
bit less impact. Temperatures will begin to climb through the
week, with 60s possible for the second half of the week.

Aviation (for the 12z tafs through 12z Saturday morning)
issued at 621 am cdt Fri mar 24 2017
widespread ifr to low MVFR ceilings to impact the terminals
through the day. It's possible to have a few pockets of slightly
improved ceilings, but given the short duration of these windows,
will continue to advertise the broken lower deck at fsd.

Showers may continue at sioux city on and off through the day,
with the highest concentrated risks this morning, and then again
later this afternoon. It's possible sioux falls could be impacted
by a few showers later this afternoon, but confidence too low to
go any further than a vicinity wording.

Up at huron, it's possible that ceilings may try to lift briefly
through the day. However, anticipating a return of stratus
overnight as flow turns easterly. This ifr stratus should remain
at all the terminals into Saturday morning. Fog may become
problematic for huron overnight, and later tafs may need to
address the risk.

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

Mn... None.

Ia... None.

Ne... None.

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


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD2 mi15 minNNW 1110.00 miOvercast39°F35°F87%1014.9 hPa

Wind History from YKN (wind in knots)
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
Last 24hrSE16
G20
SE10SE16
G20
E9SE11
G15
SE11S18
G23
S14
G18
SE7SE5NE4NE4NE7NW11N6N6N10NW6NW13N12NW13N16
G19
N15
G19
N9
G14
1 day agoSE12SE13SE14
G18
SE19SE15
G21
E14
G21
SE18
G21
SE17
G23
SE19
G22
SE19
G23
E13
G19
SE12
G18
SE16
G22
SE15
G21
SE14
G20
SE13SE15
G20
SE20
G26
SE17
G21
SE13SE11
G15
SE13SE12
G18
SE15
2 days agoN3N4N8N10N11N7N10
G14
NE11N9NE12NE9NE10NE9NE8NE11NE11NE10E6E3E10E7E9E12SE12
G18

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Midwest    EDIT
Geos

Wind Forecast for Sioux Falls, SD (10,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Sioux falls, SD
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.