Thursday, October28, 2021
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Marine Weather and Tides
Rapid City, SD

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:23AMSunset 5:49PM Thursday October 28, 2021 2:32 PM MDT (20:32 UTC) Moonrise 11:47PMMoonset 2:39PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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 281945 AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 145 PM MDT Thu Oct 28 2021

DISCUSSION. (This Evening Through Thursday) Issued at 143 PM MDT Thu Oct 28 2021

Northwest flow persist over the northern plains, between the exiting trough and the western CONUS ridge. At the surface, tightened pressure gradient is resulting in gusty northwesterly winds across central SD, sustained at 25 to 35 mph, with gusts of 45 to 50 mph. Under sunny skies, temperatures are in the 40s and 50s.

Southwesterly flow and warm air advection beneath the upper ridge will result in a mild, dry Friday. Highs will be in the 60s, with sunny skies.

Upper ridge will flatten Saturday, as a trough pushes eastward. The cold front will begin crossing our CWA early Saturday morning, bringing with it gusty northwest winds. With strong CAA and pressure rises of 3-5 mb/3 hrs, have increased forecast winds; an advisory may be necessary later. Saturday evening into Sunday, precipitation (mostly snow) will develop across the southwestern third of the CWA, along the band of 700 mb frontogenesis, beneath the right entrance region of the upper jet. Forecast soundings indicate drier air near the surface, which will limit accumulations; better moisture will be to our south. However, convergence over the central/southern Black Hills and southern foothills could result in a local maximum there, but still only a couple inches. Ensembles show about a 50% chance of exceeding one inch of snow, and low chances of exceeding 3 inches. Highs Saturday will be in the 40s and 50s, with only 30s and 40s for highs on Sunday, as cold air continues sinking into the region.

Similar temperatures will continue into next week, with overnight lows dipping into the teens and 20s. Dry northwest flow will keep precip chances low.

AVIATION. (For the 18Z TAFS Through 18Z Friday) Issued At 1014 AM MDT Thu Oct 28 2021

VFR conditions are expected through Friday morning. Gusty northwest winds will persist across the South Dakota plains through this afternoon, then diminish early this evening.

UNR WATCHES/WARNINGS/ADVISORIES. SD . Wind Advisory until 4 PM MDT /5 PM CDT/ this afternoon for SDZ032-043-044-046-047-049.

WY . None.

DISCUSSION . Pojorlie AVIATION . Johnson


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rapid City, Rapid City Regional Airport, SD9 mi40 minNNW 23 G 3410.00 miFair and Windy56°F23°F28%1021.3 hPa
Ellsworth Air Force Base, SD10 mi36 minN 24 G 2910.00 miFair and Windy55°F22°F27%1020.7 hPa

Link to 5 minute data for KRAP

Wind History from RAP (wind in knots)
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Last 24hrNW18
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G36
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NW15NW15NW10W9NW15NW21
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NW15NW15NW24
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1 day agoNW31
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NW14N80E3SE80NW14NW15NW11NW7W3NW15
G19
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2 days agoSE19SE14S18SE11S13SE14SE7E3SE10SE11S17S12SE9S11S11S11S11
G18
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G38

Tide / Current Tables for
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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