A trof of low pressure sweeping around the edge of a low pressure system moving north along the Oregon and Washington Coast produced numerous thunderstorms that moved across Eastern Washington and Northern Idaho.
Every event with a place to put it. Tap one for its entry below.
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.
A trof of low pressure sweeping around the edge of a low pressure system moving north along the Oregon and Washington Coast produced numerous thunderstorms that moved across Eastern Washington and Northern Idaho.
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 31, 9:53 PM PST, 2 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 1053 PM PDT SUN MAY 31 2015 .SYNOPSIS... Thunderstorm chances will increase markedly Monday and Tuesday as a strong upper level trough moves in from the south. Some of the storms on Monday could be strong. Unsettled and cooler weather will persist into the remainder of the work week with a threat of showers and thunderstorms each day. && .DISCUSSION... Updated to increase pops over the Washington and Idaho Palouse as thunderstorms slowly move through that area tonight. /Pelatti && .AVIATION... 06Z TAFS: The atmosphere over the aviation area continues to moisten with substantial destabilization and abundant triggering mechanisms moving up from the south tonight and especially Monday morning and through the day Monday. Of note are the thunderstorms currently near KLWS and KPUW and vicinity. Hail...heavy rain...infrequent lightning...and gusty wind before subsiding close to 8Z Monday will be an issue there and then as early as 12Z Monday a strong front moves from south to north and is expected to bring very powerful thunderstorms dropping hail and heavy rain along with frequent lightning and very gusty wind over the aviation area. Outflow boundaries from thunderstorms will loft dust and lower visibilities as well. /Pelatti && .PRELIMINARY POINT TEMPS/POPS... Spokane 60 77 53 67 50 68 / 10 70 70 50 30 20 Coeur d'Alene 58 78 52 65 49 67 / 10 80 80 60 60 30 Pullman 56 73 49 64 47 66 / 80 70 60 60 40 20 Lewiston 64 82 54 70 52 73 / 80 80 60 60 50 20 Colville 57 81 55 68 51 70 / 10 80 90 80 60 40 Sandpoint 54 77 53 65 49 67 / 10 80 100 70 70 60 Kellogg 56 75 50 63 46 66 / 10 90 90 80 70 30 Moses Lake 63 83 54 72 52 75 / 0 70 40 40 20 20 Wenatchee 64 79 54 70 52 72 / 10 70 70 50 20 20 Omak 57 81 54 69 50 71 / 0 70 90 80 30 30 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE KOTX 646 AM PDT SUN MAY 31 2015 IDZ001-002-WAZ034>038-041>044-011400- NORTHERN PANHANDLE-COEUR D'ALENE AREA-MOSES LAKE AREA- UPPER COLUMBIA BASIN-SPOKANE AREA-NORTHEAST MOUNTAINS- OKANOGAN HIGHLANDS-WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES- OKANOGAN VALLEY-WATERVILLE PLATEAU- 646 AM PDT SUN MAY 31 2015 This Hazardous Weather Outlook is for portions of North Idaho... Central Washington...East Central Washington...North Central Washington and Northeast Washington. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A low pressure system will bring a good chance for thunderstorms across the region on Monday. Some storms could be strong to severe producing large hail and damaging winds. Heavy rain is also likely with these storms...increasing the risk of flash flooding or debris flows, especially for areas located in steep terrain and near wildfire burn scars. IDZ003-004-026-027-WAZ031>033-011400- IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-LEWISTON AREA- LEWIS AND SOUTHERN NEZ PERCE COUNTIES-NORTHEAST BLUE MOUNTAINS- LOWER GARFIELD AND ASOTIN COUNTIES-WASHINGTON PALOUSE- 646 AM PDT SUN MAY 31 2015 This Hazardous Weather Outlook is for portions of North Idaho... North Central Idaho and Southeast Washington. .DAY ONE...TODAY AND TONIGHT Afternoon thunderstorms are expected to develop over the higher terrain in northeast Oregon this afternoon. Storm motion will be to the northeast with developing thunderstorms possible for the Northeast Blue Mountains over to the Central Panhandle Mountains. This area will also includes the southern portion of the Palouse down to the Camas Prairie. Some thunderstorms may become severe with isolated large hail, damaging winds and heavy downpours all potential hazards. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A low pressure system will bring a good chance for thunderstorms across the region on Monday. Some storms could be strong to severe producing large hail and damaging winds. Heavy rain is also likely with these storms...increasing the risk of flash flooding or debris flows, especially for areas located in steep terrain.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SPOKANE WA 1135 PM PDT SUN MAY 31 2015 IDZ003-026-WAZ033-010700- IDAHO PALOUSE ID-LEWISTON AREA ID-WASHINGTON PALOUSE WA- 1135 PM PDT SUN MAY 31 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LATAH...NORTHWESTERN NEZ PERCE AND EASTERN WHITMAN COUNTIES UNTIL MIDNIGHT PDT... AT 1130 PM PDT...DOPPLER RADAR WAS TRACKING A SWATH OF STRONG WINDS JUST OFF THE SURFACE IN EXCESS OF 50 MPH FROM UNIONTOWN TO JUST NORTH OF GENESEE IN LATAH COUNTY. THE STORMS WHICH PROMPTED PREVIOUS SEVERE THUNDERSTORM WARNINGS HAVE WEAKENED BELOW SEVERE LIMITS AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. WE'VE HAD NUMEROUS REPORTS OF SMALL TREE LIMBS IN THE ROADS IN THE LEWISTON AREA...BUT NO WIDESPREAD THREAT TO LIFE OR PROPERTY. GUSTY WINDS OF 40 MPH ARE STILL POSSIBLE...BUT MAINLY ON ELEVATED PLATEAUS NORTH OF LEWISTON AND NOT IN SHELTERED VALLEYS. LOCATIONS IMPACTED INCLUDE... GENESEE...TROY...JULIAETTA...KENDRICK...COLTON...UNIONTOWN AND JOEL. LAT...LON 4643 11706 4657 11723 4680 11680 4657 11656 TIME...MOT...LOC 0627Z 237DEG 30KT 4655 11698 BZ
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
1155 PM PDT SUN MAY 31 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM TSTM WND DMG LEWISTON 46.39N 116.99W
05/31/2015 NEZ PERCE ID UTILITY COMPANY
A NUMBER OF REPORTS OF TREE LIMBS BLOWN ONTO ROADS AND
INTO POWER LINES CAUSING POWER OUTAGES BETWEEN 8 PM AND
1030 PM.
&&
BZPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
1200 AM PDT MON JUN 01 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 PM HAIL 3 S CRAIGMONT 46.20N 116.47W
05/31/2015 M0.88 INCH LEWIS ID PUBLIC
HAIL RANGING FROM NICKEL TO QUARTER SIZE.
&&
BZThe Spokane radar (KOTX), 61 km away, was scanning. The volume nearest the first event began at 07:59 UTC.
7 flash flood, 5 heavy rain, 4 thunderstorm wind, 1 debris flow. Local standard time, as filed.
Official NWS Observations reported 0.99 inches of rainfall in 40 minutes for Coeur d'Alene, Idaho.
A member of the public measured 4.75 inches of rain in their rain gauge at Hayden, Idaho.
A member of the public reported rocks, mud, and debris covering US-95 road on the Lewiston, Grade not far from Lewiston, WA.
A member of the public reported that heavy rain washed out road surface and damaged driveways on Waha Glenn Road in Waha, Idaho. They also reported one half inch hail covering the ground.
Law enforcement reported water over painted horse lane in Lapwai, Idaho.
A trained spotter reported 1.10 inches of rain that fell in 20 minutes in Juliaetta, Idaho.
Law enforcement reported trees blown down on US 12 at Mile Marker 21 which is around 21 miles northeast of Lewiston, ID.
A member of law enforcement reported trees down on highway 395 at Mission Creek Road which is 3 miles west of Culdesac, ID.
A member of law enforcement reported trees down on highway 395 around 2 miles east southeast of Culdesac, Idaho.
A member of law enforcement reported water over Gifford/Reubens road which is around 4 miles south southeast of Gifford, Idaho.
Public reported retaining walls washed out in port district of Lewiston, WA. The result was rocks, mud, and debris covering roadway. The report was through Facebook.
A Facebook post from the public noted that water up to 6 inches deep pooled in the parking lot of the Red Lion Hotel in Lewiston, Idaho due to the heavy rain from thunderstorms.
A Facebook post from the public noted that a retaining wall washed out along Nez Perce Drive which caused mud and rocks to spill out onto the roadway in Lewiston, WA.
A Facebook from the public noted that standing water several inches deep collected on Southway Avenue in Lewiston, Idaho.
A member of the public reported trees damaged and metal roof damage in Peck, Idaho.
A member of the public reported that the parking lot at the Hayden Quick Stop flooded and water was flowing into the door. The nearby rain gauge reported 0.19 inches of rain in 20 minutes.
A public report noted street and parking lot flooding at the Holiday Gas Station at the intersection of W Prairie Avenue and Highway 95 in Hayden, Idaho. Water was over US 95 at Prairie Avenue as well.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2015Every state in 2015This day in weather historyWarnings in Idaho, June 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: 569320, 569331, 569312, 569306, 569307, 569313, 569308, 569309, 569310, 569311, 569314, 569315, 569316, 569317, 569327, 569319, 569321.