Friday, April10, 2020
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Marine Weather and Tides
Rapid City, 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 6:15AMSunset 7:32PM Friday April 10, 2020 2:57 AM MDT (08:57 UTC) Moonrise 11:06PMMoonset 8:06AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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 100828 AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 228 AM MDT Fri Apr 10 2020

DISCUSSION. (Today Through Thursday) Issued at 228 AM MDT Fri Apr 10 2020

Northern stream influence will grow in the period as a massive western NOAM ridge supports anomalously cold long trajectory longitudinal flow in center NOAM. Pattern change will ensue with the phasing of the cut off SW CONUS low and a vigorous northern stream shortwave. Currently, vigorous WAA is ongoing across the region as a sfc ridge shifts SE. This has allowed breezy winds to develop across portions of the western half per gusty south winds. A fairly mild day can be expected today per shortwave ridging ahead of the diving western NOAM shortwave. Primary cold front will advance into the region tonight, with falling temps into Sat. Expect morning highs most places Sat, with falling temps through the day as a potent secondary front surges south. Initial band of light precip will develop tonight and carry into Sat, starting as rain. Expect models are still too aggressive with low level moistening, with appreciable dry air lingering over the region. However, as the SW CONUS upper trough begins to shift east and phase, lift will increase across the region, maximizing Sat evening locally as the upper jet left exit region times over the FA, supporting a strong FGEN band given expected steep ll lapse rates which happen to be centered in the DGZ. End result will be a period of moderate to heavy snow Sat night, likely in a banded pattern. Current model trends are for this FGEN band to setup just south or over the far southern FA, near the NE border, with generally lesser snow amounts to the north associated with the northern stream counterpart. The exception still remains the northern Black Hills and the adjacent foothills where upslope enhancement will be in place for a period Sat. The northern Black Hills will see an earlier start to snow accums due to elevation with snow struggling to accumulate on roads on the plains at first. Hence warning snow amounts are still looking likely in the Black Hills. However, the degree of upslope enhancement still remains unclear in the foothills with lingering questions on moisture/timing. There is certainly the potential for a period of heavy snow in the foothills given steep lapse rates in the upslope forcing zone. But, if things dry out faster as the NAM indicates, much less snow would be expected in the foothills. Hence there remains a large spread potential there. With potential forecast snow amounts, felt prudent to extent the watch south and east following the FGEN band and upslope areas, adjusting start times for concerns on April’s insolation impact to accums. Wind does not look too terrible at this time, with the breeziest winds likely in the lee of the Black Hills, supporting some blowing snow. Very cold temps (esp morning lows) expected through mid next week, with temps below normal at least through then. Continued unsettled NW flow will allow snow shower chances nearly every day, esp over NE WY and the Black Hills.

AVIATION. (For the 06Z TAFS Through 06Z Friday Night) Issued At 1057 PM MDT Thu Apr 9 2020

VFR conditions expected tonight and Friday across the area. Breezy southerly winds are expected to develop overnight across parts of northeast WY.

UNR WATCHES/WARNINGS/ADVISORIES. SD . Winter Storm Watch from Saturday morning through Sunday morning for SDZ024-028.

Winter Storm Watch from Saturday evening through Sunday morning for SDZ027-030-041-042-044-047-074.

Winter Storm Watch from Saturday afternoon through Sunday morning for SDZ025-026-029-072.

WY . Winter Storm Watch from Saturday morning through Sunday morning for WYZ057.



DISCUSSION . JC AVIATION . 26


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rapid City, Rapid City Regional Airport, SD9 mi65 minS 1610.00 miFair32°F12°F45%1017.6 hPa
Ellsworth Air Force Base, SD10 mi61 minS 1610.00 miFair33°F12°F44%1017 hPa

Link to 5 minute data for KRAP

Wind History from RAP (wind in knots)
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Last 24hrN10N9N11N12
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NE9E8E7SE6SE5S8S9S13S16
1 day agoNW5N10N14N19
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2 days agoW3CalmNW4N7NW6NW4W4N6N75554NW11
G22
N17NE13NE6NE5N9N15N10N11N11N14

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Wind Forecast for Rapid City, SD (4,6,7,8)
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Ground Weather Radar Station Rapid City, SD
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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.