Alert archive / Idaho / Flash Flood Warnings in 2021
Flash Flood Warning 19, NWS Pocatello, ID
NWS Pocatello, ID issued this flash flood warning at Aug 1, 2021, 3:47 PM MDT for Blaine County, Idaho. It was in force for 3 hr. 1 report 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
- Aug 1, 2021, 3:47 PM MDT (21:47 UTC)
- Expired
- Aug 1, 2021, 6:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Pocatello, ID
- Area
- Storm-based polygon
- Flood severity
- None
County Blaine County, ID
The radar
The Boise radar (KCBX), 129 km from the middle of the area, began a volume at 21:48 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 |
|---|---|---|---|
| Aug 1, 5:00 PM MDT | FLASH FLOOD | 10 Sse Galena, ID | SEVERAL INCHES OF MUD, ROCKS AND DEBRIS OVER BAKER CREEK ROAD THAT CLOSED DOWN THE ROAD. A SURVEY TEAM FOUND THIS WAS IN AN AREA OF PREVIOUS FIRE BURN AND IN DISCUSSIONS WITH LOCAL OFFICIALS, IT WAS DETERMINED THIS WAS THE SECOND TO TWO SIMILAR SLIDES IN THE S |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 9.8 hours before the alert went out and 125 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
- 4 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 1142 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
168
WGUS55 KPIH 012147
FFWPIH
IDC013-020045-
/O.NEW.KPIH.FF.W.0019.210801T2147Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pocatello ID
347 PM MDT Sun Aug 1 2021
The National Weather Service in Pocatello has issued a
* Flash Flood Warning for...
Northwestern Blaine County in central Idaho...
* Until 645 PM MDT.
* At 347 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. The expected rainfall rate is
0.5 to 1 inch in 1 hour or less. Flash flooding is expected to
begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Blaine County.
This includes the following streams and drainages...
North Fork Thompson Creek, Warm Springs Creek, West Fork Prairie
Creek, Placer Creek, South Fork Baker Creek, Newman Creek, Big
Wood River, Baker Creek, South Fork Warm Springs Creek, Norton
Creek, Deer Creek, Butterfield Creek, East Fork Baker Creek,
Anderson Creek, Apollo Creek, Snow Creek, Spruce Creek, Prairie
Creek, Left Fork Placer Creek, Castle Creek and Thompson Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4381 11471 4376 11451 4351 11457 4352 11458
4353 11460 4356 11459 4358 11462 4357 11463
4359 11465 4359 11468 4361 11468 4362 11467
4366 11466 4369 11469 4370 11468 4372 11468
4374 11467 4375 11469 4379 11469
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
JKeyes1 follow-up statement
370
WGUS75 KPIH 020037
FFSPIH
Flash Flood Statement
National Weather Service Pocatello ID
637 PM MDT Sun Aug 1 2021
IDC013-020047-
/O.EXP.KPIH.FF.W.0019.000000T0000Z-210802T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Blaine ID-
637 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM MDT THIS EVENING FOR
NORTHWESTERN BLAINE COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
A Flash Flood Watch remains in effect until 900 PM MDT Monday for a
portion of central Idaho.
LAT...LON 4381 11471 4376 11451 4351 11457 4352 11458
4353 11460 4356 11459 4358 11462 4357 11463
4359 11465 4359 11468 4361 11468 4362 11467
4366 11466 4369 11469 4370 11468 4372 11468
4374 11467 4375 11469 4379 11469
$$
TWThe office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:07 PM MDT | Flash Flood Warning | PIH | Cassia | 3 hr |
| 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, 3:51 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.