Flooding due to the rise of the Big Wood River due to snowmelt and spring rains flooded parts of Hailey including War Eagle Drive, Flat Top Road, and Camp Creek Road. 9 million dollars on Flat Top Road and Camp Creek Road.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PIH wrote it up.
Flooding due to the rise of the Big Wood River due to snowmelt and spring rains flooded parts of Hailey including War Eagle Drive, Flat Top Road, and Camp Creek Road. Damages were estimated at 1.9 million dollars on Flat Top Road and Camp Creek Road.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Pocatello, ID wrote its last area forecast discussion before the first event at May 31, 1:01 PM MST, 11 hours earlier.
Area Forecast Discussion National Weather Service Pocatello ID 201 PM MDT Wed May 31 2023 .SHORT TERM...Today and Thursday. The upper level low over southern California will keep moisture moving into our area, especially our southern areas. The troughing over the Washington and Oregon will continue to bring moisture over our northern areas, especially the northern Central mountains. Our northern and southern areas have the best chance of scattered showers and thunderstorms this afternoon with the Snake Plain/Eastern Magic Valley and Arco desert looking to just get isolated showers and thunderstorms. Look for gusty winds, small hail, and moderate to heavy rain with thunderstorms. Southwest of Burley and the Central mountains are in an Excessive Rainfall Outlook (ERO) and have the best potential for flash flooding with slowing moving thunderstorms today. These same areas have the best lift as well with CAPE of 1000 to 1500 J/kg. The best shear or 20 to 25 kts is in the Central mountains. The storms in the Central mountains look to have better hail and gusty wind potential. Tomorrow, Thursday, the low in southern California looks to move east and north as it starts to fill and weaken. This will bring even more moisture into our area. The trough over Washington and Oregon will approach the Idaho line. This trough will bring slightly more moisture and instability into our area as well. Look for more widespread showers and thunderstorms tomorrow with better coverage than today. Again, expect gusty winds, small hail, moderate to heavy rainfall with thunderstorms. Most of our area Thursday will be under the ERO outlook. Only the Shoshone area and most of the Eastern Magic valley are out of the ERO. Look for chances of flash flooding again tomorrow afternoon, especially over the mountains and urban areas with training and slow moving storms. Look for near normal temperatures today and slightly below normal temperatures Thursday with more overall cloud cover likely. Wyatt .LONG TERM...Friday through next Wednesday. With one main area of low pressure centered over Colorado and another off the British Columbia Coast, broad troughing over the Rocky Mountains will support a shortwave trough ejected from the ERN Pacific low keeping active weather going through the weekend. Precipitation will be characterized showers and thunderstorms peaking in intensity during the afternoon and evening hours becoming increasingly isolated overnight. PWATs continue to run between 120 to 180 percent of normal supporting stronger thunderstorms to be efficient rain producers. The ECMWF remains more bullish on keeping those higher PWATs in place through the weekend and while ensemble solutions remain in good agreement on a ridge of high pressure building in the Pacific NW, the GFS continues to be the drier solution bringing some of that WRN drier air further east. The latest NBM forecast supports a blend of the ECMWF and GFS solutions keeping with chances for showers and thunderstorms each day with temperatures beginning a warming trend starting Sunday. Early next week, deterministic and ensemble solutions point to a near repeat of the weather pattern earlier the previous week as a slow moving low works east through California and the SRN Great Basin keeping precipitation chances going as warm air remains in place. Afternoon highs starting Monday will be in the 70s to mid 80s running about 4 to 8 degrees above normal for many locations. The overall trend in the long term continues to keep our above normal and active weather pattern going through much of next week with little ensemble support for any well defined ridge signature that could bring a return to very dry conditions. MacKay && .AVIATION...For the 18Z TAFS through 18Z Thursday. Our active weather pattern continues across ERN Idaho for Wednesday with another round of scattered afternoon thunderstorms beginning to develop late this afternoon that will increase in coverage and intensity later today. HREF probabilities show a 40 to 60 percent chance of thunderstorms at KPIH, KIDA, and KDIJ with a 70 to 80 percent chance at KBYI and KSUN. Wind gusts up to 45 kts, small hail, and heavy rain are expected with stronger thunderstorms that develop. Predominant VFR conditions are expected outside of showers and thunderstorms with storms capable of MVFR/IFR VIS as they move on station. Thunderstorms starting in the mountains will work out onto the Snake Plain this afternoon and evening as a more organized line of convection pushes north with mostly dry conditions returning overnight outside of isolated mountain showers. Much of the same is expected for Thursday with best chances for thunderstorms shifting east. This is reflected in the HREF probabilities Thursday with a 40 to 60 percent at KPIH and KIDA, a 30 to 40 percent chance at KBYI and KSUN, and a 70 to 80 percent chance at KDIJ. MacKay && .HYDROLOGY...The risk of flooding continues on multiple rivers and creeks across central and eastern Idaho. The daily risk of heavy rainfall will persist through the weekend, and is reflected by all or parts of our area under a MARGINAL RISK for excessive rainfall from the folks at WPC. Any heavy rainfall on top of already swollen/flooding rivers and streams will cause rapid rises, even if they are short-lived. We are also dealing with potential issues due to erosion around the dam spillway at Chesterfield Reservoir. We continue to monitor situation along with local officials, and based on that we have issued a FLASH FLOOD WATCH FOR THE POTENTIAL FAILURE OF THE PORTNEUF DAM SPILLWAY ON CHESTERFIELD RESERVOIR. Keyes && .PIH WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch through Friday afternoon for IDZ058. &&
Preliminary Local Storm Report
National Weather Service Pocatello ID
712 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0645 PM Tstm Wnd Gst 5 ENE Magic City 43.32N 114.29W
05/31/2023 M47 MPH Blaine ID Public
Timmerman Hill.
&&
MHPreliminary Local Storm Report
National Weather Service Pocatello ID
713 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 PM Tstm Wnd Gst 4 W Taber 43.33N 112.71W
05/31/2023 M45 MPH Bingham ID Public
Taber.
&&
MHPreliminary Local Storm Report
National Weather Service Pocatello ID
824 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM Tstm Wnd Gst 5 WSW Craters of Moon 43.39N 113.63W
05/31/2023 M56 MPH Butte ID Public
Tom Cat Summit.
&&
MHPreliminary Local Storm Report
National Weather Service Pocatello ID
826 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0754 PM Tstm Wnd Gst 15 S Craters of Moon 43.21N 113.56W
05/31/2023 M55 MPH Blaine ID Mesonet
Potter Butte Raws.
&&
MHPreliminary Local Storm Report
National Weather Service Pocatello ID
827 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0740 PM Tstm Wnd Gst 2 WSW Butte City 43.60N 113.28W
05/31/2023 M53 MPH Butte ID Mesonet
Arco ARL.
&&
MHPreliminary Local Storm Report
National Weather Service Pocatello ID
828 PM MDT Wed May 31 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0745 PM Tstm Wnd Gst 8 SSW Mud Lake 43.72N 112.52W
05/31/2023 M53 MPH Jefferson ID Mesonet
Rover ARL.
&&
MHThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Flooding due to the rise of the Big Wood River due to snowmelt and spring rains flooded parts of Hailey including War Eagle Drive, Flat Top Road, and Camp Creek Road. Damages were estimated at 1.9 million dollars on Flat Top Road and Camp Creek Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2023Every state in 2023This day in weather historyWarnings in Idaho, June 2023
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1115234.