An atmospheric river of moisture brought heavy rain to parts of Eastern Washington.
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The episode as NWS OTX wrote it up.
An atmospheric river of moisture brought heavy rain to parts of Eastern Washington.
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 Spokane, WA wrote its last area forecast discussion before the first event at Oct 30, 9:54 PM PST, 2 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 1054 PM PDT FRI OCT 30 2015 .SYNOPSIS... A deep fetch of Pacific moisture will feed into the region promoting occasional rain into Saturday. Windy and gusty conditions will also develop for a damp and blustery Halloween. Unsettled conditions with occasional wet periods will continue into the start of the work week. Look for a drier but cooler trend by midweek. && .DISCUSSION... Forecast update sent out to expire the Wind Advisory. Winds will remain breezy this evening, but will weaken below criteria. I also slowed the next warm front a little bit compared to the previous forecast. Models are in good agreement that low level flow will not back from out of the southwest until after about midnight. Once these winds shift back out of the southwest, we will see an increasing amount of moisture fill back in over the region. Until that time, much of the stratiform precipitation associated with the warm front will remain west of the Cascades. Strong westerly flow will act to keep a rain shadow over much of eastern WA. The Central Panhandle Mtns will continue to see scattered rain showers through the rest of this evening where orographic enhancement will play a bigger role. Convection will remain weaker than during the late afternoon hours, so our thunderstorm threat seems to have come to an end. The primary areas to watch out for for heavier rain overnight will be from the Palouse into the Central Panhandle Mtns. This is the area where models are showing strong isentropic ascent to take place. P-wats are expected to climb to above 0.90 inches, which is more than 2 standard deviations above normal. Models indicate between a quarter to a half of an inch of precip possible overnight in a six hour period. Then another quarter to a half an inch of precip will be possible Saturday morning; local rainfall accumulations up to 1.25 inches will be possible in the Central Panhandle Mtns over a 12 hour period from midnight to around noon tomorrow. Although the chances for flooding impacts are low, small streams and burn scared areas will need to be monitored through Saturday morning with this next batch of rain set to move in. /SVH && .HYDROLOGY... An atmospheric river will linger through the weekend, bringing moderate to heavy rain to the slopes of the east Cascades and the mountains of northeast Washington and the Idaho Panhandle. Storm total rainfall totals through Saturday night are as much as 5 inches near the crest of the Cascades and over 3 inches in the mountains of the Idaho Panhandle. Impacts of concern from this rain event include minor rock and mud slides on steep slopes. It is also possible that loose woody debris in recently burned areas may become mobilized which means there is the potential for debris dam formation in small streams. This is mainly concern for the Grizzly Complex, Kaniksu Complex, Wolverine and Duncan fire burn scars where the heaviest rain is expected. Due to the antecedent dry conditions and below average flow in area rivers and streams, this event is not expected to cause any stream or river flooding. && .AVIATION... 06Z TAFS: A very moist warm front will push across the region tonight and Saturday. The leading edge of the precip shield located just south of a line from KLWS to KEAT at 06Z. Light to moderate rain is expected at all TAF sites with a brief break possible early Saturday at KPUW, KLWS, KMWH and KEAT. Cigs and vis will likely degrade into MVFR category with isolated IFR cigs possible early Saturday morning. Winds will also increase by Saturday afternoon with gusts between 25-35 mph possible. /SVH && .PRELIMINARY POINT TEMPS/POPS... Spokane 50 56 46 54 40 47 / 100 100 50 60 50 40 Coeur d'Alene 49 54 45 53 40 47 / 100 100 80 70 60 60 Pullman 51 61 47 56 39 48 / 100 100 90 50 50 40 Lewiston 53 67 49 63 44 53 / 90 60 90 40 50 50 Colville 46 55 43 53 36 51 / 90 100 50 70 50 50 Sandpoint 46 52 43 52 36 47 / 80 100 90 80 80 60 Kellogg 47 51 44 49 37 45 / 100 100 90 90 70 70 Moses Lake 53 66 47 60 40 54 / 90 50 10 30 20 20 Wenatchee 53 62 44 56 41 53 / 80 50 10 40 20 30 Omak 46 60 40 56 37 51 / 70 70 10 50 30 40 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
Hazardous Weather Outlook National Weather Service SPOKANE WA 140 PM PDT FRI OCT 30 2015 IDZ001>004-026-027-WAZ031>038-041>044-312045- NORTHERN PANHANDLE-COEUR D'ALENE AREA-IDAHO PALOUSE- CENTRAL PANHANDLE MOUNTAINS-LEWISTON AREA- LEWIS AND SOUTHERN NEZ PERCE COUNTIES-NORTHEAST BLUE MOUNTAINS- LOWER GARFIELD AND ASOTIN COUNTIES-WASHINGTON PALOUSE- MOSES LAKE AREA-UPPER COLUMBIA BASIN-SPOKANE AREA- NORTHEAST MOUNTAINS-OKANOGAN HIGHLANDS-WENATCHEE AREA- EAST SLOPES NORTHERN CASCADES-OKANOGAN VALLEY-WATERVILLE PLATEAU- 140 PM PDT FRI OCT 30 2015 This Hazardous Weather Outlook is for portions of North Idaho... North Central Idaho...Central Washington...East Central Washington...North Central Washington...Northeast Washington and Southeast Washington. .DAY ONE...THIS AFTERNOON AND TONIGHT The first in a series of sustained periods of light to moderate rain will develop today over the entire region. Windy conditions will develop this afternoon with gusts in the 40 to 50 mph range across the Columbia Basin, Wenatchee area, Pomeroy area, and on ridges and peaks in the mountains surrounding the basin. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Several rounds of moderate to heavy rain will continue over the mountains Saturday and Sunday. At this time, the flash flood threat for the north central Washington burn scars looks low. The heaviest rains will occur along and west of the Cascade Crest and over the mountainous portions of the Idaho Panhandle. Minor mudslides are possible in steep terrain. Saturday and Sunday will continue to be windy. At this time, it looks like Saturday will be the windiest day with southwest winds of 20 of 30 mph gusting to near 50 mph over the Palouse, West Plains, and Columbia Basin. Exposed mountain ridges will also have the potential to experience gusts in the 40 to 50 mph range on Saturday. Light mountain snow accumulations will be possible Sunday night into Monday in the Cascades and Idaho Panhandle then mainly in the Idaho Panhandle Monday night into Tuesday.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Minor flooding along Pope Creek impacting a few cabins on USFS land was noted by the Park/Forest service.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2015Every state in 2015This day in weather historyWarnings in Washington, October 2015
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: 605871.