Slow moving thunderstorms produced heavy rain over portions of southern Deschutes county. Small hail also occurred with some of these storms.
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 PDT wrote it up.
Slow moving thunderstorms produced heavy rain over portions of southern Deschutes county. Small hail also occurred with some of these storms.
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 Pendleton, OR wrote its last area forecast discussion before the first event at May 24, 2:28 PM PST, 1 hour 2 minutes earlier.
Area Forecast Discussion...Updated National Weather Service Pendleton OR 328 PM PDT Thu May 24 2018 Updated Aviation Discussion .SHORT TERM...Tonight through Sunday. Upper low approaching the California coast has turned the flow aloft southerly across the forecast area. Water vapor imagery shows a weak short wave moving through. This feature combined with some instability will result in scattered showers and isolated thunderstorms over central and northeast Oregon this afternoon into the evening. Activity should dissipate a few hours after sunset. Models develop a large area of convection over the Sierra and advect this into southern and central Oregon later tonight and Friday morning. Forecast will indicate the potential for some heavier rain in this area toward morning. By Fri afternoon the center of the upper low is moving into central California with a deep southerly flow over the forecast area. Expect showers and thunderstorms over much of central and northeast Oregon in the afternoon and evening. Will likely have some stronger storms as well. The Columbia basin northward into Yakima valley and Ellensburg will have little to no activity tonight and Friday with partly cloudy skies. Based on the position of the upper low could see showers continue into Friday night over the eastern portion of the forecast area. By Saturday the low is moving eastward into Nevada. Lingering clouds and showers over the eastern mountains otherwise skies becoming partly cloudy. Upper level ridge builds over the region Sat night and Sunday with fair weather. 94 .LONG TERM...Sunday night through Thursday...An upper level low over the Great Basin will drift slowly east Sunday night and Monday. Wraparound moisture and instability from the low may trigger a few showers and thunderstorms in Wallowa County Monday and Tuesday afternoon and evening. Transitory ridging will develop behind the low and keep most of eastern WA and OR dry Sunday night and Monday. An upper level trough from the Gulf of Alaska will drop down into WA and OR Tuesday night and Wednesday. The associated cold front will bring much cooler temperatures Wednesday and Thursday. The moist flow ahead of the system will trigger some showers along the southern border of the CWA Tuesday night and Wednesday. Orographic effects, daytime heating, and lift from the trough will enhance instability and trigger a few thunderstorms from Grant to Wallowa County Wednesday afternoon. Coonfield && .AVIATION...0Z TAFs...A moist and unstable southwest flow will keep a chance of showers and thunderstorms near TAF sites KRDM and KBDN tonight. There may be brief periods of MVFR conditions associated with TS. Decreasing winds after sunset tonight, then increasing again at KDLS KPDT and KALW tomorrow afternoon. 76 && .PRELIMINARY POINT TEMPS/POPS... PDT 56 77 54 71 / 10 20 30 30 ALW 59 81 55 73 / 10 20 40 30 PSC 59 84 55 79 / 10 10 10 10 YKM 55 82 51 77 / 10 10 10 10 HRI 58 81 56 76 / 10 10 20 10 ELN 53 78 50 72 / 10 10 10 10 RDM 52 67 43 65 / 40 80 30 20 LGD 51 74 52 64 / 40 50 70 40 GCD 52 72 48 62 / 40 70 70 40 DLS 56 76 52 71 / 10 20 20 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && 94/76/76
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Slow moving thunderstorms caused heavy rain in and around La Pine, in Deschutes county. Rain fall of up to 1.3 inches occurred with ponding of water on driveways and property due to poor drainage of relatively flat ground. Small hail occurred, piling to a depth of 1 inch, 4 miles SW of La Pine causing standing water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2018Every state in 2018This day in weather historyWarnings in Oregon, 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: 754844.