Alert archive / Idaho / Flash Flood Warnings in 2026

Flash Flood Warning 8, NWS Pocatello, ID

September 17, 2026Jefferson County, Madison County, Idaho

NWS Pocatello, ID issued this flash flood warning at Sep 17, 2026, 10:04 AM MDT for Jefferson County, Madison County, Idaho. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 17, 2026, 10:04 AM MDT (16:04 UTC)
Expired: Sep 17, 2026, 1:00 PM MDT
In force: 3 hr
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Jefferson County, ID, Madison County, ID

The radar

The Pocatello radar (KSFX), 96 km from the middle of the area, began a volume at 16:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 4.1 hours before the alert went out and 336 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 339 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1793 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Sep 17, 1:04 AM MDT, 9 hours earlier.

Area forecast discussion, Sep 17, 1:04 AM MDT, 9 hours before

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The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 17, 12:09 AM MDT	Special Weather Statement	PIH	Oneida	51 min
Sep 17, 12:46 AM MDT	Special Weather Statement	PIH	Power	29 min
Sep 17, 1:47 PM MDT	Severe Thunderstorm Warning	PIH	Oneida, Power	28 min
Sep 17, 1:50 PM MDT	Special Weather Statement	PIH	Minidoka	25 min
Sep 17, 1:52 PM MDT	Special Weather Statement	PIH	Blaine	23 min
Sep 17, 2:12 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Blaine, Butte	33 min
Sep 17, 2:14 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Oneida, Power	16 min
Sep 17, 2:29 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Blaine, Butte, Minidoka, Power	46 min
Sep 17, 2:43 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Butte, Jefferson	47 min
Sep 17, 3:16 PM MDT	Special Weather Statement	PIH	Bingham	29 min
Sep 17, 3:28 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Butte, Jefferson	62 min
Sep 17, 4:16 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Clark, Fremont, Jefferson, Madison	44 min
Sep 17, 4:57 PM MDT	Special Weather Statement	PIH	Clark, Fremont	48 min
Sep 17, 5:38 PM MDT	Special Weather Statement	PIH	Bingham	37 min

Nearby

Flash Flood Warnings in Idaho, 2026 Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.