Tuesday, December10, 2019
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Marine Weather and Tides
Heron, MT

Version 3.4
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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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:22AMSunset 3:57PM Tuesday December 10, 2019 4:47 PM PST (00:47 UTC) Moonrise 4:11PMMoonset 6:31AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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 Heron, MT
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location: 47.98, -116     debug


Area Discussion for - Spokane, WA
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FXUS66 KOTX 102347 AFDOTX

Area Forecast Discussion National Weather Service Spokane WA 347 PM PST Tue Dec 10 2019

SYNOPSIS. Bands of light snow will spread across central and eastern Washington this evening and overnight and linger over the Idaho Panhandle Wednesday morning. Motorists should expect slick conditions during the morning commute Wednesday. Another storm system will bring heavy mountain snow to the region late Wednesday night into Friday.

DISCUSSION.

. SLICK MORNING COMMUTE WEDNESDAY . . HEAVY MOUNTAIN SNOW POSSIBLE LATE IN THE WEEK .

Tonight: A frontal system will spread snow across the Inland Northwest tonight bringing widespread light accumulations to the majority of the region. Based on satellite imagery, the models have initialized this system well. There is a clear vorticity center off the coast of northern California and southern Oregon which the operational NAM, GFS and ECMWF have identified. Looking at the HREF members, there is good clustering of the ensemble members. There is good agreement that light snow will spread across the Cascades between 4 PM and 6 PM. Places like Wenatchee, Moses Lake, and Wilbur will likely receive less than an inch this evening. Snow should reach Ritzville, Colville, Spokane, and Cusick between 10 PM and midnight. One inch amounts with localized bands producing up to 2 inches in eastern Washington by 5 AM. Similar amounts are expected over much of the north Idaho Panhandle with the most significant accumulations falling before 8 AM. Untreated roads will be slick early in the day with temperatures in the low 30s.

Wednesday: Travel conditions should improve region wide by mid day with afternoon temperatures climbing into the mid 30s to low 40s. Without a strong push of dry air in the low levels behind tonight's front, low clouds will be prominent on Wednesday. Areas of fog are likely across the West Plains, Waterville Plateau, and portions of the Columbia Basin. /GKoch

Wednesday night through Thursday night: A strong Pacific jet will slam into the Oregon Coast steering a rich fetch of moisture and pair of frontal systems through the region. Steady west to southwest winds in the midlevels of the atmosphere will enhance lift into the rising terrain of the Cascade Crest and Idaho Panhandle. Consequently, the region will get a good hosing of precipitation mainly in the form of mountain snow and valley rain. Winter Storm Watches have been hoisted for the mountains where confidence remains high for a significant snow event.

*Timing: The first wave of moisture will arrive Wednesday evening/night with the first of two frontal systems. This system departs to the east by sunrise Thursday morning but swift westerly flow will continue to result in orographic precipitation while some drying in the lee of the Cascades. This will be short-lived as a second frontal system arrives Thursday afternoon/evening. This second system quickly departs to the east Thursday night but persistent westerly flow continues into Friday morning with a healthy barrage of upsloping mountain snow. *Snow/Freezing Rain: The Cascade Crest and Idaho Panhandle will be hardest with a good chance for 8 to 12 inches. Local amounts in excess of a foot will be possible in Idaho and 2 to 3 feet along the Cascade Crest. Cold air in place to start the event will allow for precipitation to start as snow for the northern valleys tucked in the lee of the Cascades, Waterville Plateau, and mountain valleys north of Highway 2. There is lower confidence for exact snow amounts for the lower elevations between Highway 2 and the Canadian Border, Hwy 97 corridor, and Waterville Plateau given uncertainty with the transition to rain or non- accumulating snow. At this time, thinking areas like Republic, Colville, Ione, Metaline Falls, and Priest Lake will stand a decent shot for a few inches before making the transition. Light snow accumulations are also expected in the Methow Valley around Pateros and Winthrop on the order of 2-5 inches. There will also be a small threat for a period of freezing rain along the Highway 97 corridor around Entiat, Chelan, Omak and Highway 20 between Pateros and Winthrop as the warmer comes inland. Confidence is low for any ice accumulations but something we will need to closely monitor.

*Wind: A low-level jet of 35-40kts will punch into southern Washington and the Idaho Panhandle Thursday afternoon and evening. This will be around 4000 feet in elevation and could lead to gusty winds in the foothills of the Blue Mountains, higher benches of the Palouse, and across the exposed ridgetops of the Cascades and Idaho Panhandle. The winds could lead to localized blowing and drifting snow in the mountains including the passes.

*Potential Impacts: Periods of snow, heavy at times will lead to difficult if not impassible travel across the mountain passes. Be sure to check conditions before heading out at the WA and ID respective DOT sites. Heavy snow in the mountains could lead to some tree damage and isolated power outages. Some areas of concern include Lake Wenatchee, Plain, and Mazama. Slick travel will be possible in the lower elevations of the northern valleys Wednesday night and Thursday morning. /sb

Saturday through Tuesday: Generally, a drying trend is still expected as a weak split flow is expected to develop offshore the western US. Deterministic model guidance is unable to agree in what general directions significant moisture and associated precipitation will follow. GFS shows the bulk of the energy directed into NRN CA with a developing disturbance while the ECMWF and the Canadian guidance shows a more direct approach of an embedded wave pushing into the Pac NW. Therefore, ensemble guidance provided a more consistent message during this period. The latest probabilistic guidance shows the potential for weak isentropic ascent along a weakening warm frontal boundary that pushes into the flattened upper ridge over the Pac NW. Although model guidance does show a gradual decrease in mountain snowfall across the Cascades on Saturday, precipitation should persist over higher terrain of the northern and central Panhandle with a chance for some snow reaching valley floors over the central Panhandle and Camas Prairie Saturday. The uncertainty with regards to POPs and timing, however, remains an issue for the precipitation potential over those areas overnight Sunday night into Monday morning, and again with passage of the next weather producer entering the Inland Northwest on Tuesday. Snow levels will be low to start so more attention is likely for this potential in the days ahead. As a westerly upper flow becomes more northwesterly through the weekend, temperatures will also adjust accordingly to more seasonal averages through this period and beyond. Highs will range in the 30s while overnight lows drop into the 20s over most locations. /aky

AVIATION. 00Z TAFS: Light snow will spread east of the Cascades between 00-02z and reach Spokane, Coeur d'Alene, and Pullman between 06z- 09z. Most airports across the Inland Northwest will receive measurable snow. Short range ensembles forecast a half inch to as high as 2 inches by sunrise Wednesday. Some freezing rain may mix in near EAT/MWH and on the tail end of the precipitation around GEG. Some general rain may also mix in around SFF/PUW/LWS. Snow chances wanes in the morning, but without a strong push of drier air expected low clouds and fog. Some improvement is possible toward the mid to later afternoon with additional shower chances developing. /Cote'

PRELIMINARY POINT TEMPS/POPS. Spokane 29 37 35 44 33 39 / 80 40 90 60 40 20 Coeur d'Alene 31 38 35 43 33 38 / 80 40 90 80 50 30 Pullman 32 40 37 47 35 42 / 60 30 80 80 40 40 Lewiston 35 45 37 50 37 45 / 40 20 70 70 40 30 Colville 26 37 31 42 29 40 / 70 10 90 60 30 20 Sandpoint 30 36 33 41 32 37 / 80 20 100 90 60 40 Kellogg 32 37 34 42 34 37 / 70 70 90 90 80 70 Moses Lake 27 38 34 46 31 44 / 80 10 70 30 20 10 Wenatchee 29 37 32 42 31 41 / 60 20 80 50 30 20 Omak 27 36 31 41 29 38 / 30 0 80 40 20 10

OTX WATCHES/WARNINGS/ADVISORIES. ID . Winter Storm Watch from Wednesday evening through Friday morning above 3000 feet for Central Panhandle Mountains-Northern Panhandle.

WA . Winter Storm Watch from Wednesday afternoon through Friday morning for the cascade crest including highway 2 between coles corner and stevens pass for East Slopes Northern Cascades.




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sandpoint, Sandpoint Airport, ID37 mi52 minN 010.00 miFair32°F28°F87%1021.7 hPa

Link to 5 minute data for KSZT

Wind History from SZT (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE4CalmCalmCalmCalmCalmCalmCalmNE4N5NE4NE6CalmCalm
1 day agoSW6CalmCalmCalmCalmCalmCalmSW3CalmCalmSW3CalmCalmW4CalmCalmCalmS4SW4CalmCalmSW3SW3SW3
2 days agoCalmCalmCalmS3W4SW3S4S3SW3SW7SW7W7W8W7
G15
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S5CalmN6SW3SW3SW6S6SW4SW8

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of PacificNorthwest    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
Wind Forecast for Spokane, WA (19,4,5,8)
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Ground Weather Radar Station Spokane, WA
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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 numerious 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.