Alert archive / Idaho / Flash Flood Warnings in 2026

Flash Flood Warning 4, NWS Boise, ID

July 23, 2026Ada County, Idaho

NWS Boise, ID issued this flash flood warning at Jul 23, 2026, 9:10 PM MDT for Ada County, Idaho. It was in force for 95 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 23, 2026, 9:10 PM MDT (03:10 UTC)
Expired
Jul 23, 2026, 10:45 PM MDT
In force
95 min
Issued by
NWS Boise, ID
Area
Storm-based polygon
Flood severity
None

County Ada County, ID

The radar

The Boise radar (KCBX), 4 km from the middle of the area, began a volume at 03:09 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

Boise Airport, ID (KBOI), launched 00:00Z, 3.2 hours before the alert went out and 14 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-pSkew-T log-p diagram, Boise Airport, ID at 00:00Z on 2026-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 249 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 00:00Z on 2026-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
249 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
3324 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 6:13 PM MDTSpecial Weather StatementBOIPayette47 min
Jul 23, 6:22 PM MDTSpecial Weather StatementBOI38 min
Jul 23, 7:35 PM MDTSpecial Weather StatementBOIAda40 min
Jul 23, 8:05 PM MDTSpecial Weather StatementBOIAda40 min
Jul 23, 8:44 PM MDTSpecial Weather StatementBOIAda46 min
Jul 23, 8:47 PM MDTSevere Thunderstorm WarningBOIAda, Boise43 min
Jul 23, 9:22 PM MDTSpecial Weather StatementBOIBoise23 min
Jul 23, 9:54 PM MDTSpecial Weather StatementBOIBoise51 min
Jul 23, 10:31 PM MDTFlash Flood Warning Considerable damage threatBOIBoise119 min
Jul 24, 12:56 PM MDTSpecial Weather StatementBOITwin Falls49 min
Jul 23, 7:30 PM MDTSpecial Weather StatementBOIBaker45 min

Nearby

Flash Flood Warnings in Idaho, 2026Every 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.