Brief high wind occurred on Lopez Island.
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The episode as NWS SEW wrote it up.
Brief high wind occurred on Lopez Island.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Seattle, WA wrote its last area forecast discussion before the first event at Jan 1, 3:32 PM PST, 1 hour 43 minutes earlier.
Area Forecast Discussion National Weather Service Seattle WA 332 PM PST Sun Jan 1 2017 .SYNOPSIS...A modified arctic front will sweep across the area tonight for locally gusty northerly winds. Meanwhile, a low pressure system aloft will slowly weaken through Monday before drifting off the Oregon coast Monday night. High pressure aloft will prevail Tuesday and Wednesday for dry, chilly weather. Temperatures will be below normal through at least midweek. && .SHORT TERM... Snow showers mainly lingered over northeast Clallam County (adjacent to the Strait of Juan de Fuca), the north slopes of the Olympic range, and the southeast corner of the CWA. These areas were likely receiving measurable snowfall. This is especially true for northeast Clallam County (adjacent to the Strait of Juan de Fuca) and the north slopes of the Olympic range, where upslope flow was enhancing snowfall rates. Will allow the Winter Weather Advisory for these areas to expire at 6 PM. Additional snowfall amounts after 6 PM should be below advisory criterion. Expect the snow showers to gradually diminish or taper off overnight as a drier air mass invades the region. Meanwhile, the modified arctic front was still hung up near the USA/Canadian border. However, the northerly pressure gradient was tightening due to rising surface pressures over British Columbia and lower pressure over northern Oregon. The front (albeit much weakened) should sweep across the CWA once the surface low over Oregon slips farther south. Will keep the Wind Advisory going through tonight; although, speeds will likely diminish during the night. The upper level Low will gradually weaken through Monday, with the low center drifting to off the Oregon coast Monday night. Expect a clearing trend later tonight through Monday, with the snow shower threat ending for the entire CWA by Monday evening. Wind and/or clouds will keep min temperatures from becoming too cold tonight. However, under clear skies and less wind (for most areas) Monday night, expect temperatures to be as much as ten degrees colder than tonight. This will be especially true for the snow covered areas. High pressure aloft will prevail over the region Tuesday through Wednesday for dry weather with below normal temperatures. Decided to lean towards the ECMWF solution for Wednesday. The operational GFS appeared to be the outlier of the various solutions. On the plus side, the 1800 UTC GFS cycle has backed off on the idea of a major winter weather event impacting the CWA. In other words, this model was now coming more in line with the other solutions. .LONG TERM... At this point, Thursday still appeared dry and chilly for the CWA. Beyond Thursday, confidence in the details was low. The models agreed that the flow aloft will become westerly and then back to southerly by the end of the period. However, there was disagreement on how quickly this will happen. In general, the GFS was the faster of the solutions. Decided to lean towards the slower ECMWF. Depending on how quickly the chilly air mass scours out, one can expect a threat of lowland snow before the precip changes over to rain. This could happen quickly or it could be a gradual process. && .AVIATION...An upper low will remain quasi-stationary over southwest Washington tonight and Monday with light easterly flow aloft. At the surface, moderate to strong northeast offshore flow will prevail with high pressure over southern British Columbia. The air mass is stable. Areas of low and mid clouds should continue to decrease tonight as drier air moves into the area. KSEA...Mid level clouds floating around this evening should gradually decrease with no ceilings by Monday. North wind 10 to 15 knots. Schneider && .MARINE...High pressure over southern British Columbia will produce moderate to strong northeast offshore flow tonight through Monday. Gale force Fraser River outflow winds are likely across the northern inland waters and in the eastern and central Strait of Juan de Fuca, with small craft advisory winds over the remaining marine zones. Moderate northeast to east flow will prevail Tuesday through Friday. Schneider && .HYDROLOGY... River flooding is not expected the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...Winter Weather Advisory in effect until 6 PM this evening for the Strait of Juan de Fuca and Olympic range. Wind Advisory in effect until 4 AM Monday for San Juan County and the lowlands of western Whatcom and Skagit Counties. PZ...Gale Warnings are in effect for the central/eastern Strait of Juan de Fuca and the Northern Inland Waters. Small Craft Advisories are in effect for the remaining waters. Small Craft Advisory for rough bar in effect until 10 AM Monday for the Grays Harbor Bar. && www.weather.gov/seattle An illustrated version of this forecast discussion can be seen at www.weather.gov/seattle/gafd/latest_webafd.html
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1157 AM PST SUN JAN 01 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 AM SNOW WSW GLENOMA 46.51N 122.16W
01/01/2017 M6.0 INCH LEWIS WA TRAINED SPOTTER
ELEVATION 820 FEET.
&&
GRUBThe national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Lopez Island recorded high wind of 40 mph gusting to 47 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2017Every state in 2017This day in weather historyWarnings in Washington, January 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 673025.