Alert archive / Idaho / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS Boise, ID
NWS Boise, ID issued this flash flood warning at Aug 1, 2021, 3:39 PM MDT for Camas County, Elmore 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 outline as issued.
The facts
- Issued
- Aug 1, 2021, 3:39 PM MDT (21:39 UTC)
- Expired
- Aug 1, 2021, 6:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Boise, ID
- Area
- Storm-based polygon
- Flood severity
- None
Counties Camas County, ID, Elmore County, ID
The radar
The Boise radar (KCBX), 116 km from the middle of the area, began a volume at 21:41 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 12:00Z, 9.7 hours before the alert went out and 113 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.
637
WGUS55 KBOI 012139
FFWBOI
IDC025-039-020030-
/O.NEW.KBOI.FF.W.0007.210801T2139Z-210802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boise ID
339 PM MDT Sun Aug 1 2021
The National Weather Service in Boise has issued a
* Flash Flood Warning for...
Northwestern Camas County in southwestern Idaho...
East Central Elmore County in southwestern Idaho...
* Until 630 PM MDT.
* At 339 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or 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...
Fleck Summit, Smoky Dome, Soldier Mountain Ski Area, Paradise
Peak, Baumgartner Campground, Big Peak, Cannonball Mountain and
Gunsight Peak.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4350 11522 4360 11517 4382 11509 4372 11468
4370 11468 4369 11469 4366 11466 4359 11468
4359 11465 4357 11463 4356 11459 4353 11460
4337 11459 4337 11480
FLASH FLOOD...RADAR INDICATED
$$
ST2 follow-up statements
439
WGUS75 KBOI 012309
FFSBOI
Flash Flood Statement
National Weather Service Boise ID
509 PM MDT Sun Aug 1 2021
IDC025-039-020030-
/O.CON.KBOI.FF.W.0007.000000T0000Z-210802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camas ID-Elmore ID-
509 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT THIS
EVENING FOR NORTHWESTERN CAMAS AND EAST CENTRAL ELMORE COUNTIES...
At 509 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain has fallen across the warned area. Between 1 and 2 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Fleck Summit, Smoky Dome, Soldier Mountain Ski Area, Paradise
Peak, Baumgartner Campground, Big Peak, Cannonball Mountain and
Gunsight Peak.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4350 11522 4360 11517 4382 11509 4372 11468
4370 11468 4369 11469 4366 11466 4359 11468
4359 11465 4357 11463 4356 11459 4353 11460
4337 11459 4337 11480
FLASH FLOOD...RADAR INDICATED
$$
ST934
WGUS75 KBOI 020029
FFSBOI
Flash Flood Statement
National Weather Service Boise ID
629 PM MDT Sun Aug 1 2021
IDC025-039-020039-
/O.EXP.KBOI.FF.W.0007.000000T0000Z-210802T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camas ID-Elmore ID-
629 PM MDT Sun Aug 1 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MDT THIS EVENING FOR
NORTHWESTERN CAMAS AND EAST CENTRAL ELMORE COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flash Flood Watch remains in effect until 1200 AM MDT for portions
of south central Idaho, southwest Idaho and west central Idaho.
LAT...LON 4350 11522 4360 11517 4382 11509 4372 11468
4370 11468 4369 11469 4366 11466 4359 11468
4359 11465 4357 11463 4356 11459 4353 11460
4337 11459 4337 11480
$$
STThe office that day
Everything else NWS Boise, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:40 PM MDT | Special Weather Statement | BOI | Twin Falls | 35 min |
| Jul 31, 7:06 PM MDT | Flash Flood Warning | BOI | Owyhee, Twin Falls | 3 hr |
| Jul 31, 7:39 PM MDT | Flash Flood Warning | BOI | Twin Falls | 3 hr |
| Jul 31, 9:32 PM MDT | Special Weather Statement | BOI | Ada | 28 min |
| Jul 31, 9:33 PM MDT | Areal Flood Advisory | BOI | Elmore, Owyhee | 117 min |
| Jul 31, 10:12 PM MDT | Flash Flood Warning | BOI | Ada, Boise | 3 hr |
| Jul 31, 11:58 PM MDT | Flash Flood Warning | BOI | Canyon, Gem, Owyhee, Payette | 2 hr |
| Aug 1, 12:43 AM MDT | Areal Flood Advisory | BOI | Payette, Washington | 2 hr |
| Aug 1, 1:47 AM MDT | Areal Flood Advisory | BOI | Camas | 103 min |
| Aug 1, 1:11 PM MDT | Special Weather Statement | BOI | Twin Falls | 49 min |
| Aug 1, 1:25 PM MDT | Areal Flood Advisory | BOI | Twin Falls | 3 hr |
| Aug 1, 2:15 PM MDT | Special Weather Statement | BOI | Jerome | 60 min |
| Aug 1, 2:39 PM MDT | Flash Flood Warning | BOI | Elmore | 5 hr |
| Aug 1, 3:21 PM MDT | Areal Flood Advisory | BOI | Jerome, Twin Falls | 3 hr |
| Aug 1, 4:01 PM MDT | Flash Flood Warning | BOI | Owyhee | 3 hr |
| Aug 1, 4:49 PM MDT | Areal Flood Advisory | BOI | Elmore | 3 hr |
| Aug 1, 5:32 PM MDT | Flash Flood Warning | BOI | Elmore | 3 hr |
| Aug 1, 5:39 PM MDT | Areal Flood Advisory | BOI | Owyhee | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.