Thursday, December5, 2019
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Marine Weather and Tides
Rapid City, SD

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:10AMSunset 4:16PM Thursday December 5, 2019 12:39 PM MST (19:39 UTC) Moonrise 2:23PMMoonset 1:15AM Illumination 64% Phase: Waxing Gibbous; Moon at 9 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 Rapid City, SD
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location: 44.06, -103.23     debug


Area Discussion for - Rapid City, SD
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FXUS63 KUNR 051743 AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 1043 AM MST Thu Dec 5 2019

DISCUSSION. (Today Through Wednesday) Issued at 335 AM MST Thu Dec 5 2019

Broad upper ridging over the western CONUS is placing the Northern Plains beneath fast northwest flow. Skies across the region are mostly clear. At the surface, high pressure is located across the Central Plains with low pressure slowly sliding across North Dakota, dragging a cold front through eastern Montana at the moment. Temperatures across the forecast area at 3am are in the 20s to lower 30s, with west to northwest winds.

Dry upper level northwest flow will keep weather quiet for a few more days, with temperatures near average. Highs will slightly cooler today as a weak cold front moves the Northern Plains, then warming again Friday and Saturday ahead of the next shortwave. Model soundings are showing some fog developing late today and tonight behind the cold front, as more moist air moves in. Best areas for fog will be over and along the northern and eastern edges of the Black Hills, and across northeastern Wyoming. Areas across southern South Dakota can also expect some fog tonight. With temperatures below freezing tonight, expect some light ice accumulations on elevated surfaces.

Fog and freezing fog will continue into Friday morning. Western ridge axis moves a little closer to the Northern Plains with dry weather continuing. Surface high pressure shifts to the southeast of the area with southerly boundary layer flow returning. Temperatures will be a few degrees warmer than today.

Ridge axis moves over the Northern Plains on Saturday as south to southwest boundary layer flow continuing. Saturday will be the warmest day this week, with temperatures in the 40s most areas.

Upper ridging breaks down mid weekend, as a strong trough moves into the Pacific Northwest. A strong cold front and upper shortwave will bring some light precipitation and colder temperatures to the region late Sunday into Sunday night. A half inch to around an inch of snowfall will be possible late Sunday night into early Monday morning. Breezy northwest winds will accompany the cold front, and persist into Tuesday. The colder air will stick around into the middle of next week, with temperatures moderating later in the week.

AVIATION. (For the 18Z TAFS Through 18Z Friday) Issued At 1043 AM MST Thu Dec 5 2019

A cold front will continue to push southward across the forecast area today. MVFR/IFR conditions will develop from northwest to southeast behind the front. Areas of freezing fog with LIFR conditions will develop this evening and continue into Friday morning, especially around the Black Hills.

UNR WATCHES/WARNINGS/ADVISORIES. SD . None. WY . None.

DISCUSSION . 15 AVIATION . 13


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rapid City, Rapid City Regional Airport, SD9 mi48 minN 21 G 3010.00 miFair and Breezy36°F28°F73%1019.5 hPa
Ellsworth Air Force Base, SD10 mi44 minN 22 G 2410.00 miMostly Cloudy and Breezy36°F27°F71%1020 hPa

Link to 5 minute data for KRAP

Wind History from RAP (wind in knots)
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Last 24hrSE4SE4E3CalmCalmNE4CalmW8NW7NW7N10N13W6NW8NW8NW8NW12NW11NW11N12N14N17
G26
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1 day agoN9NW11S5CalmS4CalmW4W3SW3W4W4NW7NW8NW7NW6NW6W4NW6CalmW3NW4CalmS3SE4
2 days agoN9N12N8SW5SW7SW5SW3N3CalmNW4NW6W8NW3CalmW3CalmW5W4NW6NW8CalmCalmW3NW3

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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wmap_P
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 Rapid City, SD (14,3,4,5)
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Ground Weather Radar Station Rapid City, 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.