Alert archive / Idaho / Flash Flood Warnings in 2026
Flash Flood Warning 13, NWS Pocatello, ID
NWS Pocatello, ID issued this flash flood warning at Sep 18, 2026, 10:44 AM MDT for Jefferson County, Madison County, Idaho. It was in force for 89 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2026, 10:44 AM MDT (16:44 UTC)
- Expired
- Sep 18, 2026, 12:13 PM MDT
- In force
- 89 min
- 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), 101 km from the middle of the area, began a volume at 16:44 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, 4.7 hours before the alert went out and 320 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.
- Mixed-layer CAPE
- 878 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1649 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.4
The text
As transmitted.
499
WGUS55 KPIH 181644
FFWPIH
IDC051-065-181945-
/O.NEW.KPIH.FF.W.0013.260918T1644Z-260918T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pocatello ID
1044 AM MDT Fri Sep 18 2026
The National Weather Service in Pocatello has issued a
* Flash Flood Warning for...
The Big Rock burn scar in...
Southeastern Jefferson County in southeastern Idaho...
South Central Madison County in southeastern Idaho...
* Until 145 PM MDT.
* At 1044 AM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Big Rock Burn Scar. The expected rainfall rate
is 0.5 to 1 inch in 1 hour. Already saturated and filled ditches
and culverts could become quickly inundated. Flash flooding is
ongoing or expected to begin shortly. Excessive rainfall over the
burn scar will result in debris flow moving through the Big Rock
burn scar. The debris flow can consist of rock, mud, vegetation and
other loose materials.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Big Rock Burn Scar.
SOURCE...Radar indicated.
IMPACT...Life threatening flash flooding of areas in and around the
Big Rock Burn Scar.
* Some locations that will experience flash flooding include...
Heise.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall will cause
extensive and severe flash flooding of creeks...streams...and ditches
in the Big Rock Burn Scar. Severe debris flows can also be
anticipated across roads. Roads and driveways may be washed away in
places. If you encounter flood waters...climb to safety.
&&
LAT...LON 4366 11172 4367 11173 4368 11172 4366 11170
4366 11167 4367 11165 4365 11163 4364 11164
4364 11165 4363 11166 4363 11169 4364 11169
4365 11171
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR
$$
TAX1 follow-up statement
785
WGUS75 KPIH 181813
FFSPIH
Flash Flood Statement
National Weather Service Pocatello ID
1213 PM MDT Fri Sep 18 2026
IDC051-065-181823-
/O.CAN.KPIH.FF.W.0013.000000T0000Z-260918T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson ID-Madison ID-
1213 PM MDT Fri Sep 18 2026
...FLASH FLOOD WARNING FOR THE BIG ROCK BURN SCAR IS CANCELLED FOR
SOUTHEASTERN JEFFERSON AND SOUTH CENTRAL MADISON COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose an
immediate threat. Please continue to heed remaining road closures.
There is potential for an additional round of showers and
thunderstorms later today.
A Flood Watch remains in effect until 1200 AM MDT Saturday for
portions of central, eastern, and southeast Idaho.
&&
LAT...LON 4366 11172 4367 11173 4368 11172 4366 11170
4366 11167 4367 11165 4365 11163 4364 11164
4364 11165 4363 11166 4363 11169 4364 11169
4365 11171
$$
TAXThe office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 6:14 PM MDT | Special Weather Statement | PIH | Bingham | 31 min |
| Sep 17, 7:32 PM MDT | Severe Thunderstorm Warning | PIH | Bear Lake | 29 min |
| Sep 17, 7:52 PM MDT | Special Weather Statement | PIH | Jefferson | 53 min |
| Sep 17, 8:25 PM MDT | Special Weather Statement | PIH | Bingham | 50 min |
| Sep 17, 9:08 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville | 52 min |
| Sep 17, 9:32 PM MDT | Severe Thunderstorm Warning | PIH | Bingham | 43 min |
| Sep 17, 9:51 PM MDT | Flash Flood Warning | PIH | Madison | 5 hr |
| Sep 17, 10:00 PM MDT | Flash Flood Warning | PIH | Bonneville, Jefferson | 4 hr |
| Sep 17, 10:05 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Oneida, Power | 29 min |
| Sep 17, 10:11 PM MDT | Severe Thunderstorm Warning | PIH | Bingham, Bonneville, Jefferson | 36 min |
| Sep 17, 10:25 PM MDT | Flash Flood Warning | PIH | Jefferson, Madison | 4 hr |
| Sep 17, 10:37 PM MDT | Severe Thunderstorm Warning | PIH | Bannock, Bingham, Caribou, Power | 38 min |
| Sep 17, 11:24 PM MDT | Special Weather Statement | PIH | Bonneville, Teton | 66 min |
| Sep 17, 11:26 PM MDT | Special Weather Statement | PIH | Bonneville | 49 min |
| Sep 18, 12:17 AM MDT | Special Weather Statement | PIH | Bonneville, Madison, Teton | 43 min |
| Sep 18, 12:21 AM MDT | Special Weather Statement | PIH | Bingham | 39 min |
| Sep 18, 2:52 AM MDT | Flash Flood Watch | PIH | Bonneville, Fremont, Jefferson, Madison | 8 hr |
| Sep 18, 8:28 AM MDT | Special Weather Statement | PIH | Bannock, Bear Lake, Caribou | 32 min |
| Sep 18, 9:08 AM MDT | Flash Flood Warning | PIH | Blaine | 5 hr |
| Sep 18, 10:30 AM MDT | Flood Watch | PIH | Bannock, Bear Lake, Bingham, Blaine, Bonneville, Butte and 10 more | 8 hr |
| Sep 18, 1:37 PM MDT | Flash Flood Warning | PIH | Blaine, Butte, Custer | 3 hr |
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.