A small thunderstorm with weak rotation produced a land spout that was visible from the air. This was reported from a pilot near Burns, OR.
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The episode as NWS BOI wrote it up.
A small thunderstorm with weak rotation produced a land spout that was visible from the air. This was reported from a pilot near Burns, OR.
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 Boise, ID wrote its last area forecast discussion before the first event at Jun 27, 7:48 AM PST, 4 hours 12 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 948 AM MDT Tue Jun 27 2023 .DISCUSSION...No updates to the forecast this morning. Current satellite observations show thunderstorm activity tracking westward over the Central Idaho Mountains as a quasi-stationary surface low sits over the region. Thunderstorm activity will continue to develop over higher terrain today, primarily over the West Central and Boise Mountains and along the Idaho/Nevada border. Weak steering flow will prevent sustained storms this afternoon, but training storms over the mountains raises the concern for isolated flooding in terrain-prone areas. High resolution models are hinting at the potential (roughly a 25 percent chance) for storms to move into the valley later this afternoon around the evening commute, but confidence is low at this time. The highest uncertainty in the forecast remains over the chance of the lower valleys peaking above 100 degrees to start off the month of July. Forecast models are trending slightly cooler, so confidence over the first 100-degree day of the summer happening soon is decreasing. && .AVIATION...Mainly VFR. Scattered showers and thunderstorms will expand across Eastern Oregon and the higher terrain of southwest Idaho on Tuesday afternoon. Most activity will be around KMYL and KBKE, between 17Z and 03Z. There is a chance of outflow gusts to 30- 40 kt, blowing dust, and small hail with strong storms. Surface winds outside of thunderstorms: W-NW 5-15 kt becoming variable less than 10 kt after 06Z/Wed. Winds aloft at 10k feet MSL: SW-NW 10-20 kt. && .PREV DISCUSSION... SHORT TERM...Today through Thursday night...A slow moving upper level low will continue to meander into the Intermountain West today. Wraparound scattered afternoon showers and thunderstorms are likely throughout the region as the low continues to move east. The highest confidence for precipitation (80% chance) is in the West Central/Boise Mountains and Baker County, OR as these locations are closest to the low center. Some of the high resolution models are also initializing showers and thunderstorms in Central Malheur County and near the Owyhee Mountains late tonight likely due to a weak embedded shortwave trough moving over western Nevada. Gusty outflow winds appear to be the main threat with these storms, although small hail and heavy rain will accompany stronger storms. Several rounds of showers are possible in the West Central Mountains due to the slow moving low, so minor localized flooding could be an issue with heavier showers in steeper terrain. Weaker winds aloft will likely prevent storms from moving quickly and organizing into stronger systems, so short lived pulse storms throughout the rest of the region are expected Tuesday afternoon-evening. Breezy northwest winds 10-15 mph are expected tomorrow afternoon in low elevation valleys as the low continues to push east. Isolated storms and showers are expected Wednesday afternoon- evening, mainly over higher terrain in Idaho. A ridge will then build into the region on Thursday as the upper level low finally moves into the Central Plains. This ridge will bring warmer temperatures and dry conditions to the region, with lower elevations in the Snake River Valley nearing or exceeding 90 degrees. LONG TERM...Friday through Tuesday...A ridge will extend northward over the region on Friday, as a high pressure block forms over California. The latest deterministic model runs show this ridge flattening out slightly by Saturday as a deeper upper level trough edges into British Columbia. However, ensemble cluster analysis shows this ridge continuing to expand over the West Coast through the weekend, with little influence from the Canadian upper level trough. Regardless of the position of the ridge, temperatures are expected to be 5-10 degrees above normal throughout the holiday weekend. Current model probabilities give a 20-30% chance that the Treasure Valley will exceed triple digits by this weekend. A weak upper level trough is expected to move in by the end of the long term period, although models differ on timing and extent of the trough. This trough would allow for slightly cooler temperatures throughout the region by early next week and even a slight chance of showers in south central Idaho by the Fourth of July (Tuesday). && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...AL AVIATION.....JM PREV SHORT TERM...SA PREV LONG TERM....SA
Special Weather Statement National Weather Service Boise ID 1101 AM PDT Tue Jun 27 2023 ORZ061-271845- Harney County OR- 1101 AM PDT Tue Jun 27 2023 ...A strong thunderstorm will impact portions of north central Harney County through 1145 AM PDT... At 1042 AM PDT, a pilot reported a small landspout to the surface 15 miles west of Burns, moving southeast at 5 mph. HAZARD...Landspouts. SOURCE...Public. IMPACT...Minor damage to outdoor objects is possible. This strong thunderstorm will be near... Burns, Hines and Sand Hill around 1140 AM PDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... If outdoors, consider seeking shelter inside a building. When safe to do so, please relay storm reports to the National Weather Service in Boise via local law enforcement, or National Weather Service Boise Facebook and Twitter accounts. && LAT...LON 4359 11932 4375 11922 4370 11888 4345 11903 TIME...MOT...LOC 1800Z 293DEG 6KT 4365 11918 LANDSPOUT...OBSERVED MAX HAIL SIZE...0.00 IN MAX WIND GUST...<30 MPH AL
Preliminary Local Storm Report
National Weather Service Boise ID
1212 PM MDT Tue Jun 27 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1210 PM Landspout 8 ENE Riley 43.59N 119.35W
06/27/2023 Harney OR Airplane Pilot
From PIREP, small tornado to the surface,
haze is making it hard to see. Likely a
brief landspout.
&&
JMPreliminary Local Storm Report
National Weather Service Boise ID
136 PM MDT Tue Jun 27 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0130 PM Hail 3 SW Murphy 43.19N 116.60W
06/27/2023 E0.25 inch Owyhee ID Public
Public reported marble sized hail.
&&
MASpecial Weather Statement
National Weather Service Boise ID
138 PM MDT Tue Jun 27 2023
IDZ014-272030-
Upper Treasure Valley ID-
138 PM MDT Tue Jun 27 2023
...Strong thunderstorms will impact portions of south central Ada,
southwestern Elmore and central Owyhee Counties through 230 PM MDT...
At 138 PM MDT, Doppler radar was tracking strong thunderstorms near
Oreana, or 28 miles west of Mountain Home, moving east at 10 mph.
HAZARD...Penny size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
This strong thunderstorm will be near...
Grand View, C J Strike Reservoir, C J Strike Dam and Hinton
Reservoir around 230 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4284 11624 4315 11637 4317 11605 4285 11591
4283 11622
TIME...MOT...LOC 1938Z 265DEG 9KT 4306 11626
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH
LCThe Pendleton radar (KPDT), 238 km away, was scanning. The volume nearest the first event began at 19:58 UTC.
1 tornado. Local standard time, as filed.
A pilot report remarked that a small tornado to the surface was visible near Riley, OR. Haze made it hard to retain any other details. This was likely a brief landspout.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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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: 1108892.