Weather Alerts for Lower Snake River Plain

Issued by the National Weather Service

River Flood Warning  RIVER FLOOD WARNING   River Flood Warning
LOWER SNAKE RIVER PLAIN

Areas Affected:
Bannock
Effective: Sun, 6/4 11:59am Updated: Mon, 6/5 8:16am Urgency: Expected
Expires: Mon, 6/5 3:00pm Severity:  Moderate  Certainty: Likely

 
Details:
...The Flood Warning continues for the following rivers in Idaho...
Portneuf River at Pocatello affecting Bannock County.
Additional information is available at www.weather.gov/pocatello.
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...
* WHAT...Moderate flooding is occurring and moderate flooding is
forecast. The river is forecast to drop off of moderate flood
stage into minor flood stage by later this coming week.
* WHERE...Portneuf River at Pocatello.
* WHEN...Until further notice.
* IMPACTS...At 10.0 feet, Significant flooding of agricultural land
will occur from the Inkom and Blackrock area. Lowland flooding
will occur along sections of the river in Pocatello from Portnuef
Gap to the Cheyenne Avenue Bridge and downstream of the concrete
channel beginning at Sacajawea Park.
* ADDITIONAL DETAILS...
- At 10:45 AM MDT Sunday the stage was 10.2 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 10:45 AM MDT Sunday was 10.3 feet.
- Forecast...The river is expected to rise to a crest of 10.3
feet early tomorrow afternoon.
- Flood stage is 8.5 feet.
- Flood History...This crest compares to a previous crest of
10.1 feet on 02/02/1963.
- http://www.weather.gov/safety/flood
&&
Fld   Observed           Forecasts (12 pm MDT)
Location      Stg   Stg   Day/Time     Mon   Tue   Wed
Portneuf River
Pocatello     8.5   10.2  Sun 10 am MD 10.3  10.1  10.0
&&

Information:
Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Caution is urged when walking near riverbanks.

River Flood Warning  RIVER FLOOD WARNING   River Flood Warning
LOWER SNAKE RIVER PLAIN

Areas Affected:
Bannock
Effective: Sun, 6/4 11:56am Updated: Mon, 6/5 8:16am Urgency: Expected
Expires: Mon, 6/5 3:00pm Severity:  Moderate  Certainty: Likely

 
Details:
...The Flood Warning continues for the following rivers in Idaho...
Portneuf River at Topaz affecting Bannock County.
Additional information is available at www.weather.gov/pocatello.
...FLOOD WARNING REMAINS IN EFFECT UNTIL FURTHER NOTICE...
* WHAT...Minor flooding is occurring and minor flooding is forecast.
* WHERE...Portneuf River at Topaz.
* WHEN...Until further notice.
* IMPACTS...At 4.0 feet, Lowland and crop field flooding possible
from Pebble Creek to Inkom.
* ADDITIONAL DETAILS...
- At 11:15 AM MDT Sunday the stage was 4.8 feet.
- Recent Activity...The maximum river stage in the 24 hours
ending at 11:15 AM MDT Sunday was 4.8 feet.
- Forecast...The river is expected to remain steady above flood
stage at 4.8 feet.
- Flood stage is 4.0 feet.
- Flood History...This crest compares to a previous crest of
4.8 feet on 05/15/2011.
- http://www.weather.gov/safety/flood
&&
Fld   Observed           Forecasts (12 pm MDT)
Location      Stg   Stg   Day/Time     Mon   Tue   Wed
Portneuf River
Topaz         4.0   4.8   Sun 11 am MD 4.7   4.7   4.7
&&

Information:
Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Caution is urged when walking near riverbanks.

Flash Flood Watch  FLASH FLOOD WATCH   Flash Flood Watch
LOWER SNAKE RIVER PLAIN

Areas Affected:
Blackfoot Mountains - Marsh and Arbon Highlands
Effective: Sat, 6/3 2:09pm Updated: Mon, 6/5 8:16am Urgency: Expected
Expires: Mon, 6/5 3:00pm Severity:  Severe  Certainty: Possible

 
Details:
...FLASH FLOOD WATCH FOR THE POTENTIAL FAILURE OF PORTNEUF DAM
SPILLWAY ON CHESTERFIELD RESERVOIR ON THE PORTNEUF RIVER REMAINS IN
EFFECT THROUGH MONDAY AFTERNOON...
* WHAT...Flash Flooding caused by a potential spillway failure is
possible at the Portneuf Dam on Chesterfield Reservoir.
* WHERE...A portion of southeast Idaho, including along the Portneuf
River downstream of Chesterfield Reservoir thorugh Pebble and
along Old Highway 30 south to Lava Hot Springs and downstream to
McCammon.
* WHEN...Through Monday afternoon.
* IMPACTS...Failure of the spillway may result in flash flooding of
low-lying areas below the dam, including areas that are already
experiencing flooding along the Portneuf River.
* ADDITIONAL DETAILS...
- http://www.weather.gov/safety/flood

Information:
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued. PLAN NOW so you will know
what to do in an emergency.
Officials remain on site closely monitoring the situation. Please
follow Caribou County Sheriffs Office on social media and consider
signing up for Caribou County Alert Sense for the latest information.

CoCoRaHS (Community Collaborative Rain, Hail and Snow Network) Station Number: ID-GM-5 Live Lightning Map - USA Boise Skywarn Spotter ID: DO21 AlertID Northwestern Weather Network Southwestern Weather Network

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