Monday, April19, 2021
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Marine Weather and Tides
Rapid City, SD

Version 3.4
NOTICE
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 6:00AMSunset 7:43PM Monday April 19, 2021 3:48 PM MDT (21:48 UTC) Moonrise 10:57AMMoonset 2:12AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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 191952 AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 152 PM MDT Mon Apr 19 2021

DISCUSSION. (This Evening Through Monday) Issued at 149 PM MDT Mon Apr 19 2021

Broad trough covers the CONUS, with upper low spinning over the Hudson Bay. Water vapor indicates shortwave energy moving through the northern plains. Our CWA is between the right entrance region of one jet streak and the left exit region of another. Stratiform snow has shifted to the far southern portions of SD, but snow showers have developed across much of the area. With cold high pressure sinking into the region, winds are northerly 10 to 20 kts, and temperatures are in the 20s and 30s.

Shortwave energy, along with lingering moisture and weak instability/steep lapse rates, will allow for snow showers to continue through tonight and Tuesday. Most places will see minimal accumulations. This afternoon and early evening, the southern Black Hills/foothills could receive a few more inches of snow due to downstream convergence. The northern Black Hills could continue to see some upslope enhancement; the HRRR Froude number is between 1 and 2 today through tonight. A few more inches of snow will be possible there through Tuesday afternoon.

Warmer, drier air will move back into the region Wednesday and Thursday. Highs will warm into the 40s and 50s, beneath sunny skies.

Models continue to show an upper wave and associated cold front crossing the northern plains Friday, bringing cooler temperatures and light rain/snow showers. A warming trend is then expected into early next week, beneath broad upper ridging. Deterministic models and ensembles are hinting at a longwave trough/low pressure system pushing into the central states towards the middle of next week, but it is too early to know how much moisture our area will receive from this system, or in what form.

AVIATION. (For the 18Z TAFS Through 18Z Tuesday) Issued At 1116 AM MDT Mon Apr 19 2021

Isolated to scattered SHSN are expected on the plains through Tuesday with local IFR conditions at times. Scattered to numerous SHSN are expected in/near the Black Hills through Tuesday with areas IFR/LIFR conditions at times. Outside of snow showers VFR/local MVFR conditions expected.

UNR WATCHES/WARNINGS/ADVISORIES. SD . Winter Weather Advisory until 6 PM MDT Tuesday for SDZ024-028.

Winter Weather Advisory until 8 PM MDT this evening for SDZ027- 029-041.

WY . Winter Weather Advisory until 6 PM MDT Tuesday for WYZ057.



DISCUSSION . Pojorlie AVIATION . Helgeson


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rapid City, Rapid City Regional Airport, SD9 mi57 minNW 1810.00 miMostly Cloudy and Breezy31°F19°F61%1025.9 hPa
Ellsworth Air Force Base, SD10 mi53 minNW 18 G 2410.00 miMostly Cloudy and Breezy31°F18°F57%1025.7 hPa

Link to 5 minute data for KRAP

Wind History from RAP (wind in knots)
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Last 24hrN17
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N11NE11NE10NE11N16N10N13N18NW15NW11NW13N13N9NW15N15N19
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1 day agoN16
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N8N6NW5W5NW6W5W7W8W8NW8W7W6W7NW6W7W6NW14NW22
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2 days agoNW18
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NW9NW8NW9NW7N6NW8NW7NW6NW6NW4CalmNE7N11N12N12
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Tide / Current Tables for
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Weather Map
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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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