Marine Weather and Tides
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 6:39AM||Sunset 6:51PM||Tuesday September 22, 2020 2:37 PM MDT (20:37 UTC)||Moonrise 1:06PM||Moonset 10:20PM||Illumination 30%|
7 Day Forecast for Marine Location Near Rapid City, SDHourly EDIT Help
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 StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Rapid City, Rapid City Regional Airport, SD||9 mi||45 min||Var 6||10.00 mi||Smoke||80°F||48°F||34%||1013.4 hPa|
|Ellsworth Air Force Base, SD||10 mi||41 min||SSE 7||10.00 mi||Fair||83°F||49°F||32%||1013.1 hPa|
Link to 5 minute data for KRAP
Wind History from RAP (wind in knots)
|1 day ago||SE|
|2 days ago||E||SE||SE||SE||E||Calm||E||SW||W|
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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.
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Other links: Northern Pacific Contential US Full GOES-East
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