Spring time mountain snow melt caused the St. Joe River to rise to a minor flood level during the second and third weeks of May.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS OTX wrote it up.
Spring time mountain snow melt caused the St. Joe River to rise to a minor flood level during the second and third weeks of May. No structures were affected but bottom lands and fields in the river valley were inundated.
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 May 7, 9:22 AM PST, 1 hour 23 minutes earlier.
Area Forecast Discussion...Updated National Weather Service Spokane WA 1022 AM PDT Mon May 7 2018 Updated aviation discussion .SYNOPSIS... A low pressure system over Washington will continue to bring clouds and showers to the area today. The low pressure moves away from the region with drier conditions expected tonight. Another storm system approaches the area and showers will return on Wednesday along with cooler temperatures. As the system moves away and conditions improve Wednesday night...another low pressure system moves into the pacific northwest with another round of showers expected Thursday night and Friday. && .DISCUSSION... Today through Tuesday night: A low pressure system will continue to bring clouds and showers to the area today. The system will exit the area and drier conditions are expected tonight and Tuesday. However another storm system will take aim on the pacific northwest and bring another round of clouds and showers Tuesday afternoon and evening. The chances of rain will increase late Tuesday night for the entire region. Wednesday: The bulk of the precipitation will fall over eastern Washington and the Idaho panhandle on Wednesday. Conditions will improve Wednesday afternoon and evening. Thursday: A mid level low pressure system over western Canada is forecast to dive southeast into the pacnw Thursday. This will bring unsettled weather to the area with clouds and showers increasing throughout the day on Thursday. The low pressure moves further south and wrap around moisture will invade eastern Washington Thursday night into Friday morning with heavy rain possible. Friday through Sunday. The models were suggesting a large area of rain could position itself over eastern Washington again Friday morning with heavier rain possible. Elsewhere showers will persist. As the low pressure moves south...the rain will be on the decrease Friday night and Saturday when a ridge of high pressure builds into the area. Drier conditions and above normal temperatures are expected for Sunday. && .AVIATION... TAFS: Wraparound moisture from a system over western MT will continue to affect most TAF sites through the afternoon. Brief showers my reduce visibilities to MVFR conditions during the afternoon. Ceilings between 600-1700 feet will become unlimited through the day as the wraparound moisture continues to move slowly east. Winds will be less than 10 kts through the period. Earle && .PRELIMINARY POINT TEMPS/POPS... Spokane 69 50 78 54 65 46 / 20 10 0 20 70 10 Coeur d'Alene 66 51 77 54 62 44 / 40 20 0 10 80 10 Pullman 68 48 77 54 64 45 / 30 0 0 30 70 0 Lewiston 75 52 84 59 71 49 / 30 0 0 40 60 10 Colville 72 49 81 54 69 45 / 40 40 0 10 80 30 Sandpoint 63 49 75 52 61 42 / 50 30 10 10 70 20 Kellogg 62 46 74 50 60 41 / 60 20 0 10 60 20 Moses Lake 78 49 81 59 75 47 / 20 0 0 50 50 0 Wenatchee 79 54 80 59 73 48 / 20 0 0 90 50 0 Omak 76 50 78 59 73 46 / 20 10 0 40 80 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. && vp
Hazardous Weather Outlook National Weather Service Spokane WA 857 PM PDT Sun May 6 2018 IDZ001>004-026-027-WAZ031>038-041>044-081500- 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- 857 PM PDT Sun May 6 2018 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...TONIGHT Many rivers across northern Washington and Idaho will continue to run high. The rivers will be very cold with swift currents. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY Warm weather through the middle of next week will keep water levels on area rivers and streams very high due to snowmelt in the mountains. Rivers will be very cold with swift currents.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
The USGS River Gage on the St. Joe River at Calder recorded a sharp rise to the Flood Stage of 13.0 feet at 10:45 AM PST on May 7th. The river crested right at the Flood Stage for about 4 hours before slowly receding after 3:00 PM.
The USGS River Gage on the St. Joe River at St. Maries recorded a rise above the Flood Stage of 32.5 feet at 2:15 PM PST on May 7th. The river crested at the Minor Flood level of 33.9 feet at 6:00 PM PST May 10th and remained at that level until beginning to recede on May 11th. The river receded below Flood Stage at 10:45 AM PST on May 19th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2018Every state in 2018This day in weather historyWarnings in Idaho, May 2018
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: 756473, 756459.