Alert archive / Idaho / Flash Flood Warnings in 2021
Flash Flood Warning 16, NWS Pocatello, ID
NWS Pocatello, ID issued this flash flood warning at Jul 31, 2021, 7:07 PM MDT for Cassia County, Idaho. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 31, 2021, 7:07 PM MDT (01:07 UTC)
- Expired
- Jul 31, 2021, 10:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Pocatello, ID
- Area
- Storm-based polygon
- Flood severity
- None
County Cassia County, ID
The radar
The Pocatello radar (KSFX), 151 km from the middle of the area, began a volume at 01:11 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 8:00 PM MDT | FLASH FLOOD | 18 Wsw Oakley, ID | USFS REPORTED TRAPPER CREEK ROAD (533) WASHED OUT IN THE AREA OF FS ROAD 538 TO TROUT CREEK PASS. USFS OFFICIALS REPORTED A 12 FOOT DEEP GULLY RUNNING DOWN THE CENTER OF THE ROAD. THIS IS DUE TO EXCESSIVE RUNOFF FROM THE BURNED CANYON WALLS FROM THE BADGER BUR |
| Jul 31, 9:09 PM MDT | HEAVY RAIN 0.6 | 17 Wsw Marion, ID | MESONET STATION CRII1 - COTTON RIDGE. SINCE 409 PM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Elko, NV (KLKN), launched 00:00Z, 1.1 hours before the alert went out and 151 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
- 84 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 1100 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -45 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
646
WGUS55 KPIH 010107
FFWPIH
IDC031-010200-
/O.NEW.KPIH.FF.W.0016.210801T0107Z-210801T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pocatello ID
707 PM MDT Sat Jul 31 2021
The National Weather Service in Pocatello has issued a
* Flash Flood Warning for...
The Badger Fire Burn Area in...
Southwestern Cassia County in southeastern Idaho...
* Until 800 PM MDT.
* At 707 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain moving into the Badger Fire Burn Area. The expected
rainfall rate is 0.25 to 0.75 inches in 1 hour. Flash flooding is
ongoing or expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Rock Creek...Dry Creek...Big Cottonwood Creek...
and Trapper Creek. The debris flow can consist of rock, mud,
vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around
the Badger Fire Burn Area.
SOURCE...Radar.
IMPACT...Flooding of areas in and around the Badger Fire Burn
Area.
* Some locations that will experience flash flooding include...
Oakley Reservoir and Bostetter Ranger Station.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall may cause
extensive and severe flash flooding of creeks and streams in the
Badger Fire Burn Area. Some drainage basins impacted include Rock
Creek...Dry Creek...Big Cottonwood Creek...and Trapper Creek.
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.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4242 11429 4242 11416 4229 11413 4226 11408
4228 11405 4227 11402 4222 11405 4218 11400
4220 11395 4219 11392 4217 11394 4212 11403
4206 11408 4204 11412 4204 11428
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25-0.75 INCHES IN 1 HOUR
$$
JKeyes2 follow-up statements
883
WGUS55 KPIH 010142
FFWPIH
IDC031-010430-
/O.EXT.KPIH.FF.W.0016.000000T0000Z-210801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pocatello ID
742 PM MDT Sat Jul 31 2021
The National Weather Service in Pocatello has extended the
* Flash Flood Warning for...
The Badger Fire Burn Area in...
Southwestern Cassia County in southeastern Idaho...
* Until 1030 PM MDT.
* At 742 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over the Badger Fire Burn Area. Between 0.5 and 1 inch
of rain has fallen so far over southern portions of the burn scar.
The expected rainfall rate is 0.25 to 0.75 inches per 1 hour.
Flash flooding is ongoing or expected to begin shortly.
Excessive rainfall over the burn scar will result in debris flow
moving through the Rock Creek...Dry Creek...Big Cottonwood Creek...
and Trapper Creek. The debris flow can consist of rock, mud,
vegetation and other loose materials.
HAZARD...Flash flooding caused by thunderstorms in and around
the Badger Fire Burn Area.
SOURCE...Radar.
IMPACT...Flooding of areas in and around the Badger Fire Burn
Area.
* Some locations that will experience flash flooding include...
Oakley Reservoir and Bostetter Ranger Station.
This includes the following streams and drainages...
Willow Creek, West Fork Thoroughbred Creek, Dry Fork, Dry Creek,
West Fork Dry Creek, East Fork Thoroughbred Creek, First Fork Rock
Creek, Trapper Creek, Cold Spring Creek, East Fork Dry Creek,
Trout Creek, Left Hand Fork Beaverdam Creek, Harrington Fork,
South Fork Little Piney Creek, Rock Creek, Little Goose Creek,
South Cottonwood Creek, Sawmill Creek, Medley Creek, Goose Creek,
Middle Fork Dry Creek, Fall Creek, Second Fork Rock Creek, Big
Cottonwood Creek, Little Squaw Creek, Cabin Spring Creek, Badger
Creek, Rodeo Creek, Third Fork Rock Creek, Little Fork Third Fork
Rock Creek, Wooden Shoe Creek, Little Cottonwood Creek, Beaverdam
Creek, Little Piney Creek, Billys Hole Creek and Coyote Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a life threatening situation. Heavy rainfall may cause
extensive and severe flash flooding of creeks and streams in the
Badger Fire Burn Area. Some drainage basins impacted include Rock
Creek...Dry Creek...Big Cottonwood Creek...and Trapper Creek.
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.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4242 11429 4242 11416 4229 11413 4226 11408
4228 11405 4227 11402 4222 11405 4218 11400
4220 11395 4219 11392 4217 11394 4212 11403
4206 11408 4204 11412 4204 11428
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.25-0.75 INCHES IN 1 HOUR
$$
KSmith601
WGUS75 KPIH 010428
FFSPIH
Flash Flood Statement
National Weather Service Pocatello ID
1028 PM MDT Sat Jul 31 2021
IDC031-010438-
/O.EXP.KPIH.FF.W.0016.000000T0000Z-210801T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cassia ID-
1028 PM MDT Sat Jul 31 2021
...THE FLASH FLOOD WARNING FOR THE BADGER FIRE BURN AREA WILL EXPIRE
AT 1030 PM MDT THIS EVENING FOR SOUTHWESTERN CASSIA COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 900 PM MDT Monday for
portions of eastern Idaho and southeast Idaho.
LAT...LON 4242 11429 4242 11416 4229 11413 4226 11408
4228 11405 4227 11402 4222 11405 4218 11400
4220 11395 4219 11392 4217 11394 4212 11403
4206 11408 4204 11412 4204 11428
$$
KSmithThe office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 2:01 PM MDT | Flash Flood Warning | PIH | Power | 3 hr |
| Aug 1, 2:06 PM MDT | Areal Flood Advisory | PIH | Cassia, Minidoka | 114 min |
| Aug 1, 2:21 PM MDT | Flash Flood Warning | PIH | Cassia | 3 hr |
| Aug 1, 3:04 PM MDT | Areal Flood Advisory | PIH | Bear Lake, Franklin | 116 min |
| Aug 1, 3:09 PM MDT | Areal Flood Advisory | PIH | Cassia | 111 min |
| Aug 1, 3:47 PM MDT | Flash Flood Warning | PIH | Blaine | 3 hr |
| Aug 1, 3:51 PM MDT | Areal Flood Advisory | PIH | Bannock, Caribou, Franklin | 114 min |
| Aug 1, 4:01 PM MDT | Areal Flood Advisory | PIH | Bingham, Caribou | 119 min |
| Aug 1, 4:21 PM MDT | Areal Flood Advisory | PIH | Blaine | 114 min |
| Aug 1, 4:55 PM MDT | Special Weather Statement | PIH | Blaine | 50 min |
| Aug 1, 5:05 PM MDT | Areal Flood Advisory | PIH | Blaine, Butte | 115 min |
| Aug 1, 5:09 PM MDT | Areal Flood Advisory | PIH | Cassia | 2 hr |
| Aug 1, 5:25 PM MDT | Special Weather Statement | PIH | Power | 50 min |
| Aug 1, 5:36 PM MDT | Areal Flood Advisory | PIH | Power | 114 min |
Nearby
Flash Flood Warnings in Idaho, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.