Idaho, 2023

Flood in Idaho, April 9 to 14, 2023

April 9 to 14, 2023 · NWS PIH · 1 event in 1 county or zone

The beginning of snowmelt season brought some initial sheet flooding to Jefferson County with road and bridge damage and surrounding some homes Minimal damage occurred to the homes with about 126 thousand dollars of road and bridge damage.

Where it happened

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The toll

Deaths
0
Injuries
0
Property damage
$127,000
Crop damage
None recorded
Events
1

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.

What happened

The episode as NWS PIH wrote it up.

The beginning of snowmelt season brought some initial sheet flooding to Jefferson County with road and bridge damage and surrounding some homes Minimal damage occurred to the homes with about 126 thousand dollars of road and bridge damage.

What forecasters said that day

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 Pocatello, ID wrote its last area forecast discussion before the first event at Apr 9, 2:46 AM MST, 2 hours 14 minutes earlier.

Area forecast discussion, Apr 9, 2:46 AM MST, 2 hours 14 minutes before
Area Forecast Discussion
National Weather Service Pocatello ID
346 AM MDT Sun Apr 9 2023

.SHORT TERM...TODAY THROUGH MONDAY NIGHT...
A building ridge of high pressure will continue to support dry
conditions and a warming trend, with highs breaking into the 60s
today and upper 60s/lower 70s Mon across the ern Magic Valley and
Raft River region east to Pocatello. Deterministic NBM temps
continue to run at or below the 25th percentile, so have been using
the previous day's actual highs and the 50th percentile to nudge the
forecast warmer each day in some areas. Ripening of the snowpack,
increased runoff, and localized flooding will continue. Winds will
also start to increase Mon afternoon/eve ahead of our next system,
especially across the Central Mntns and MT border. 01

.LONG TERM...TUESDAY THROUGH NEXT SUNDAY...
Deterministic models are in fair agreement with the upper trough
working into the PAC NW Tuesday. We may be dealing with this
trough through Friday as a series of shortwaves rotate through the
region. Temperatures will start off warm on Tuesday and cool off
through Friday as these waves work through. A strong mid-level jet
is seen in the GFS forecast over the Central Mountains Tuesday
with ridgetop winds seeing gusts to 50+ mph. Snow levels will drop
across the Stanley Basin Tuesday night, and stay above 8500 ft
across the Southeastern Highlands through Wednesday morning. A
final push of colder air will bring snow levels down further
Wednesday. Operational GFS is indicating a heavy precip band
associated with frontogenetical forcing along the Southeastern
Highlands Wednesday night, though the ECMWF is less intense and
further south with the band. Might be something to keep an eye on
as the week progresses. Heading into the weekend, ensemble
clusters generally favor ridging building back into the area. This
is reflected in the deterministic models as well with
temperatures warming once again. Hinsberger

&&

.AVIATION...
Subsidence under upper ridging should keep things quiet through
the period. HREF is indicating potential for fog/stratus at PIH,
IDA and BYI, but NBM and other statistical guidance strongly favor
VFR conditions. Winds should stay 10 kts or less throughout the
next 24 hours. Hinsberger

&&

.HYDROLOGY...
A warming trend will continue through Tue with highs Mon/Tue
reaching the mid 50s in mntn valleys to near 70 in the ern Magic
Valley, Raft River region, and lower Snake Plain. Overnight lows Tue
AM may not fall below freezing across nearly the entire CWA.
Ripening of the snowpack regionwide, along with increased melting
and runoff, and localized flooding, are expected. The Portneuf River
at Pocatello is forecast to rise to near action stage Wed or Thu.
Refer to our Hydrologic Outlook (ESF) for additional details and
suggested preparedness actions. 01

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
None.

&&

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 flood. Local standard time, as filed.

Flood, Jefferson

When
April 9, 5:00 AM MST to April 14, 8:00 PM MST
Where
Jefferson County, 5 mi N of Roberts to 11 mi W of Roberts
Cause
Heavy Rain / Snow Melt
Property damage
$127,000
Reported by
Emergency Manager
Coordinates
43.792, -112.130

The beginning of snowmelt season brought some initial sheet flooding to Jefferson County with road and bridge damage and surrounding some homes Minimal damage occurred to the homes with about 126 thousand dollars of road and bridge damage.

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Idaho in 2023Every state in 2023This day in weather historyWarnings in Idaho, April 2023

Sources

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: 1095531.