A cold front moved through southeast Idaho, northwest winds increased behind the frontal passage.
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The episode as NWS BOI wrote it up.
A cold front moved through southeast Idaho, northwest winds increased behind the frontal passage.
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 May 18, 1:16 PM MST, 1 hour 30 minutes earlier.
Area Forecast Discussion
National Weather Service Boise ID
216 PM MDT Sun May 18 2025
.SHORT TERM...Tonight through Tuesday night...Lingering showers
and gusty winds will continue into the evening as the upper-
level low exits east of the region. Strong northwesterly winds
will persist through the afternoon, with widespread gusts of 35
to 55 mph—particularly across the Snake River Plain and Camas
Prairie. Peak gusts of 55 mph have already been observed in Twin
Falls and Jerome. Winds will gradually ease after sunset as the
pressure gradient weakens.
Overnight, clearing skies and diminishing winds in the wake of
the upper trough will allow temperatures to drop sharply. A
Frost Advisory has been issued for parts of the Snake River
Plain, where there is a 70% chance of lows falling into the 33 -
36°F range, particularly between Mountain Home and Jerome. On
average, the last frost occurs around May 3rd in the Treasure
Valley and May 19th in the Western Magic Valley, placing this
event at the end or just outside of the typical seasonal frost
window.
Monday will bring mostly sunny skies and continued cool
temperatures, with valley highs reaching the mid 60s. A weak
shortwave will move through the area late Monday afternoon into
the evening, bringing a round of light precipitation. Weak
instability associated with a cold frontal passage across
southeast Oregon may be sufficient to support isolated
thunderstorms (15% chance) in that area. The front exits late
Monday night, though a few showers may linger over the higher
terrain through Tuesday afternoon. Little temperature change is
expected on Wednesday, with valley highs holding in the mid 60s.
.LONG TERM...Wednesday through Sunday...An unsettled active and
wet pattern will continue to characterize the end of the work
week, with slight northwest flow keeping temperatures near
normal on Wednesday. Then, a fast moving shortwave trough will
move over the region on Thursday, bringing a slight chance
(20-30%) of thunderstorms and rain showers on Thursday
afternoon. Temperatures look to remain near or slightly above
normal through Friday, with the Treasure Valley likely seeing
highs back in the high 70s-low 80s.
Model disagreement then increases for the rest of the long term,
with some models building in a ridge of high pressure, and others
advancing a deep upper level low over the region by Saturday.
Therefore, forecast uncertainty remains high for the weekend.
&&
.AVIATION...Widespread VFR. Isolated rain and snow showers across
high terrain this afternoon, with patchy low clouds in mountain
valleys. Mountains obscured. Snow levels falling to 5000-7000 ft MSL
tonight. Surface winds: NW 15-25 kt with gusts up to 35 kt, gusts up
to 40-50 kt near Magic Valley sites, calming to NW 5-15 kt by
Mon/8Z. Winds aloft at 10kft MSL: NW 20-40 kt.
KBOI...Generally VFR with mid level cloud clover. Surface winds: NW
15-25 kt with gusts up to 40 kt, calming to NW 8 to 11 kt with gusts
to 20 kt by Mon/6Z.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory until 9 PM MDT this evening IDZ014-016-028-030.
Frost Advisory from midnight tonight to 8 AM MDT Monday
IDZ014-016.
OR...None.
&&
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SHORT TERM...JDS
LONG TERM....SA
AVIATION.....SAThe national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
The ASOS station at KTWF (Twin Falls) recorded a wind gust of 63 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2025Every state in 2025This day in weather historyWarnings in Idaho, May 2025
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: 1264092.