Sunday, August9, 2020
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Marine Weather and Tides
Vermillion, SD

Version 3.4 		NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
Sunrise 6:25AMSunset 8:36PM Sunday August 9, 2020 3:55 PM CDT (20:55 UTC) Moonrise 10:46PMMoonset 11:17AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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 Vermillion, SD
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location: 42.87, -97     debug

Area Discussion for - Sioux Falls, SD
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FXUS63 KFSD 091956 AFDFSD

AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 256 PM CDT Sun Aug 9 2020

SHORT TERM. (This Evening through Monday Night) Issued at 255 PM CDT Sun Aug 9 2020

Warm and muggy airmass leading to a capped but unstable environment across the area. Capping inversion appears to be fairly strong through 00Z, but maybe weakened this evening as a cold front moves through. CAMs are offering a variety of solutions, but those chances appear to be very conditional based on (near) saturation in the 850-600 mb layer. After 06Z tonight, models are suggesting a fairly strong 700 mb frontogenetic band moving along and south of I- 90. With this forcing and ample saturation near 700 mb, atmosphere has 1500-2000 J/kg of elevated CAPE with a fairly linear hodograph. 2-7 km bulk shear values increase through the night, with values approaching 25-35 knots by 12Z Monday morning. Could see an isolated severe storm with hail and wind being the primary severe threats.

Storms are expected to move out of the area on Monday morning, and with Canadian high pressure building into the Northern Plains, tranquil conditions are expected the remainder of Monday into Tuesday.

LONG TERM. (Tuesday through Sunday) Issued at 255 PM CDT Sun Aug 9 2020

On Tuesday, southerly flow will increase on the backside of the surface ridge leading to increasing moisture throughout the day. On Tuesday night, a shortwave is expected to track into the Central Plains, and could see a chance of convection overnight. With that said, elevated instability appears to be conditional and limited. With relatively weak wind shear through the column and limited instability, expect any storms to remain below severe limits.

Clouds and capping inversion look to be challenges as Wednesday rolls around, but with increased humidity, instability is greater if a storm can develop. Best chances appear to be Wednesday night into Thursday morning as a series of impulses move across in zonal flow.

The heat and humidity look to stick around through Friday night when a cold front is expected to plunge southward. This may provide cooler and less humid conditions next weekend with limited chances of precipitation.

AVIATION. (For the 18Z TAFS through 18Z Monday afternoon) Issued at 1231 PM CDT Sun Aug 9 2020

VFR conditions are expected to prevail through the period; however, there are still some chances for convection that may result in temporary MVFR conditions. This evening, a cold front will shift through the region. With the passage of the front, south winds will become northwest. There is also a chance of thunderstorms with the frontal passage. On Monday morning, there is a chance for elevated thunderstorms, but the chance is very conditional. Best chances for thunderstorms appears to be along and south of I-90. Included a prob30 at KFSD, but confidence was not high enough to include mention at KSUX.

FSD WATCHES/WARNINGS/ADVISORIES. SD . NONE. MN . NONE. IA . NONE. NE . NONE.

SHORT TERM . BT LONG TERM . BT AVIATION . BT

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yankton, Chan Gurney Municipal Airport, SD20 mi60 minSSE 1010.00 miFair89°F73°F59%1010 hPa

Link to 5 minute data for KYKN

Wind History from YKN (wind in knots)
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Last 24hrNE11E7E9E11E9E7E9NE5SE9SE4W16
G26		NE7SE14S4S9S4SW7SE6SE4SE7S10S11S11S10
1 day agoSE15
G21		SE16S12SE16SE12SE8SE8SE10SE7SE6SE8SE5SE5SE4SE6SE7S10S12SE14S7S4SE9SE10E6
2 days agoSE8S7SE9E8E6E6E8SE9SE6SE5S9SE9SE8SE9SE11N5E7SE9SE10SE13SE12
G17		SE17SE15
G19		SE15
G19
Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS 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 (16,3,4,5)
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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 numerous 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.