Sunday, September27, 2020
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Marine Weather and Tides
Sergeant Bluff, IA

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 7:16AMSunset 7:16PM Saturday September 26, 2020 11:09 PM CDT (04:09 UTC) Moonrise 4:14PMMoonset 12:44AM Illumination 74% Phase: Waxing Gibbous; Moon at 10 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 Sergeant Bluff, IA
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location: 42.39, -96.34     debug


Area Discussion for - Sioux Falls, SD
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FXUS63 KFSD 270401 AFDFSD

AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1101 PM CDT Sat Sep 26 2020

SHORT TERM. (This Evening through Sunday) Issued at 215 PM CDT Sat Sep 26 2020

More "Fall-like" weather is on our doorstep this afternoon as a cold front begins to slowly push across the Dakotas. Thick cirrus and layer of smoke aloft has tempered the temperature rise slightly this afternoon, but we're beginning to see clouds thin some and a bit more warming as winds begin turning to the west.

Tonight: After an evening surge of gusty winds, we'll settle into more of a persistent breezy northwest wind overnight. The persistent mixing and weak cold advection should keep temperatures in the 50s. A mid-lvl band of moisture will slide southeast into this evening an could produce a few sprinkles. High based light rain risks tied with mid-lvl frontogenesis will begin to develop along and south of the Highway 20 corridor after midnight and quickly shift south of the forecast area by daybreak.

Sunday: Upper troughing beginning to push further into the Northern Plains on Sunday with low-lvl CAA intensifying through the morning. We should begin to see sustained winds increase fairly quickly after sunrise, and by mid-day I would not rule out some gusts in the 35 knot range (or locally higher). Additionally, model guidance continues to latch onto the idea that we may see showers develop by the afternoon and evening hours as a stronger PV anomaly tracks southward. Have bumped up PoPs slightly in most areas.

LONG TERM. (Sunday Night through Saturday) Issued at 215 PM CDT Sat Sep 26 2020

Monday: Persistent northerly winds continue on Monday. Would not be surprised to see additional diurnal based showers develop across portions of Minnesota/Iowa and far eastern South Dakota Monday afternoon. This is an area of the forecast that could see PoPs increase slightly. Winds may not be as strong and RH should be slightly higher, but fire danger will again be possible.

Tuesday-Saturday: The region will be locked into the western side of very deep upper troughing over the Great Lakes for much of the upcoming week. This will result in repeated dry frontal passages, periods of gusty winds, cooler temperatures, and low relative humidity. Temperatures fall 10 degrees or more below normal by Thursday and Friday. By the end of the week, potential for another frost or even freeze may be in the cards.

AVIATION. (For the 06Z TAFS through 06Z Sunday night) Issued at 1058 PM CDT Sat Sep 26 2020

West and northwest winds will remain around 10 kt overnight. Shortly after sunrise Sunday mixing increases causing gusty northwest winds to develop at most sites. Late morning and afternoon gusts are expected to be in the 30 to 35 kt range. Cloud cover increases mid-afternoon as a weather system moves through. Rain showers are possible through the evening, especially north and east of Sioux Falls (KFSD), but accumulations will be minimal as dry air remains in the lower levels of the atmosphere. Winds decrease in magnitude after sunset Sunday.

FIRE WEATHER. Issued at 215 PM CDT Sat Sep 26 2020

Several fire weather concerns over the upcoming 5 days. Dew points are beginning to fall into the 40s west of the James river, but generally have not fallen as quickly due to lagging dry air behind the boundary. That said, as wind gusts begin to break the 20 and 25 knot mark into early evening, the grassland wildfire risk will be slightly increased.

Sunday features slightly higher concerns as dew points should continually lower overnight, setting the stage for even further mixing on Sunday as peak heating arrives. Most areas may see several hours of sub-30 percent RH values despite cooler temperatures. However, there is still some doubt as to the degree of dry air mixing down. Sustained winds in the afternoon are likely to produce very high fire danger, but may be shy of typical red flag conditions. That said, if winds are strong, that may negate the slightly higher RH values and any grassland fire would still spread.

Fire danger will remain elevated for much of the upcoming week, but may not fall to critical red flag levels. A couple days to watch may be Tuesday and especially Wednesday as a secondary surge of strong winds and dry air arrives. Current RH values may be forecast too low based on blended model guidance. Nevertheless, as fuels continue to dry, grassland fire propagation will be less difficult and this will be a concern through the week.

FSD WATCHES/WARNINGS/ADVISORIES. SD . NONE. MN . NONE. IA . NONE. NE . NONE.

SHORT TERM . Dux LONG TERM . Dux AVIATION . VandenBoogart FIRE WEATHER . Dux


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sioux City, Sioux Gateway Airport, IA3 mi17 minNW 510.00 miFair63°F48°F60%1006.5 hPa

Link to 5 minute data for KSUX

Wind History from SUX (wind in knots)
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Last 24hrNW3NW3NW3NW7SW3CalmCalmCalmSE5SE5SE7S7SW10SW10
G17
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1 day agoSE4SE3E5SE6E8SE8SE6SE9SE9SE13S5S7S11
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NW12N8NW7NW8NW7NW5CalmCalmCalm
2 days agoSE8E5S5S6S5S4SW4W6W3W4NW4N44CalmCalmNW4CalmCalmNW3E3E3CalmSE3E5

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Omaha, NE
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