Tuesday, September22, 2020
Privacy Policy
L-36.com

Marine Weather and Tides
Rapid City, SD

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:39AMSunset 6:51PM Tuesday September 22, 2020 2:37 PM MDT (20:37 UTC) Moonrise 1:06PMMoonset 10:20PM Illumination 30% Phase: Waxing Crescent; Moon at 5 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
    EDIT      (on/off)   Help


7 Day Forecast for Marine Location Near Rapid City, SD
   Hourly   EDIT   Help
location: 44.06, -103.23     debug


Area Discussion for - Rapid City, SD
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS63 KUNR 222015 AFDUNR

Area Forecast Discussion For Western SD and Northeastern WY National Weather Service Rapid City SD 215 PM MDT Tue Sep 22 2020

DISCUSSION. (This Evening Through Tuesday) Issued at 211 PM MDT Tue Sep 22 2020

Upper level analysis and water vapor imagery show southwest flow aloft with embedded shortwave moving through eastern MT into ND at this time. Further upstream, another wave will clip the far northern portion of the CWA late tonight into Wednesday morning. Could see an isolated shower or storm across the northern forecast area in response to this passing wave and weak low-level theta-e advection, although overall air mass is dry. Primary weather concern will be haze across the region tonight into Wednesday as predominately west-southwest flow aloft continues to advect smoke into the region.

Cool front will drop through the area late tonight into Wednesday morning with cooler conditions and breezy NW winds during the day. Upper trough will quickly depart to the east late Wednesday with shortwave ridging building across the Northern Plains. Warm air advection will result in a much warmer day on Thursday, although reduced insolation from haze/wildfire smoke may result in temperatures failing to reach forecast highs. Dry westerly winds will result in a dry air mass by Thursday afternoon, with minimum relative humidities falling into the teens and low 20s by the afternoon. While some uncertainty remains on the overlap of critical winds and RH, especially across portions of the western SD plains, have decided to issue a Fire Weather Watch for Thursday afternoon and evening for NE WY and far western SD. Critical to near-critical winds and RH values coupled with receptive fuels will result in elevated fire weather potential.

Much stronger wave will arrive Friday into the weekend with chances for showers. A cold front will drop through the forecast area from NW to SE late Thursday evening bringing cooler air and NW winds. Despite the broad, large-scale ascent, a lack of appreciable moisture will limit intensity and coverage of precipitation. Mean NW flow will continue into early next week with cooler (and closer to normal) temperatures expected.

AVIATION. (For the 18Z TAFS Through 18Z Wednesday) Issued At 1108 AM MDT Tue Sep 22 2020

Smoke from western wildfires will return this afternoon, which may cause MVFR visibility at times through the period. Southerly winds this afternoon and evening will shift to the west northwest around sunrise as a weak cold front moves through the area.

FIRE WEATHER. Issued at 211 PM MDT Tue Sep 22 2020

Warm and mainly dry weather is expected through the rest of the week with near critical fire weather conditions at times and generally poor overnight RH recovery. Although not headline worthy, minimum RH values in the upper teens coupled with breezy NW winds will result in elevated fire weather across portions of NE WY and far SW SD for Wednesday afternoon.

Much warmer weather is expected Thursday with dry west-southwest winds ahead of a cold front. Critical to near- critical RH and winds are expected across NE WY into far western SD. The highest likelihood of overlap of critical conditions and receptive fuels will be in NE WY Thursday afternoon, with lesser confidence in the overlap into the western SD plains. The most likely scenario for western SD will likely include critical minimum RH values, but only occasional wind gusts to near critical levels. Have opted to issue a Fire Weather Watch for Thursday afternoon and evening for NE WY and portions of western SD.

UNR WATCHES/WARNINGS/ADVISORIES. SD . Fire Weather Watch from Thursday afternoon through Thursday evening for SDZ319>327-329-332.

WY . Fire Weather Watch from Thursday afternoon through Thursday evening for WYZ314>318.



DISCUSSION . Eagan AVIATION . MLS FIRE WEATHER . Eagan


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Rapid City, Rapid City Regional Airport, SD9 mi45 minVar 610.00 miSmoke80°F48°F34%1013.4 hPa
Ellsworth Air Force Base, SD10 mi41 minSSE 710.00 miFair83°F49°F32%1013.1 hPa

Link to 5 minute data for KRAP

Wind History from RAP (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrSE10E8E5E4NE6NE5CalmW3N4E3E3CalmNW3NW3CalmCalmNW3NW3S3E4SE6SE8S96
1 day agoSE13
G19
NW10NW5NE9NE8N9N9NW8NW5NW7NW8NW6NW7NW8NW8NW9NW7W6W4334E7SE10
2 days agoE7SE9SE9SE4E3CalmE3SW7W10
G21
CalmN6W26
G38
W6
G20
NW14
G23
N8N744W4S5CalmS6SE4SE9

Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map
       (on/off)   Help Weather Map
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
Ground Weather Radar Station Rapid City, SD
   (on/off)   Help
weather_mapweather_map weather_map


Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE.
. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply anyway. 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.