Old Hwy 30 in Inkom was closed from Holstein Street to Main Street because of flooding from Rapid Creek.
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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.
Old Hwy 30 in Inkom was closed from Holstein Street to Main Street because of flooding from Rapid Creek.
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 Apr 30, 1:10 PM MST, 3 hours 50 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 210 PM MDT Sun Apr 30 2023 .SHORT TERM...Tonight through Monday night. Upper ridge overhead today and continues to slowly shift east through Monday. Deep omega-block in place with deep upper lows over the Great Lakes and off the California coast. Southerly flow increases Monday, allowing for some mid-level moisture to creep into East Idaho. There is a very small chance of a weak shower and MAYBE a lightning strike or two the rest of today, mainly in the western portions of the region, but precipitation shouldnt amount to more than a sprinkle, if any. As far as temperatures go, kept forecast above the Blend, as with previous trends, and may still not be high enough as today's temperatures are averaging some 4-8 degrees above yesterday on an hourly basis. Widespread 80+ in lower elevations is looking more likely today, and even better chances on Monday. Record temps may be approached at the official climate sites (Pocatello, Idaho Falls, Burley, Stanley, Challis). Where reasonable snow pack remains, those temperatures should be cooler, but that's a rapidly changing situation as well. Snow melt is definitely the over arching concern in the forecast cycle the next few days, and the Hydrology discussion below hits more details. As far as winds go, surface gradient stiffens between thermal surface low and high pressure to the northeast, so breezy winds pick up through the Snake Plain tonight into Monday. DMH .LONG TERM...Tue through next Sun night. The upper level ridge breaks down just enough in the northeast corner of the forecast area to produce a threat of thunderstorms with little precipitation in that area for the afternoon and evening. With the approach of the upper level low on Wed night/Thu, the increasing diffluence aloft and instability overall means an increasing threat of showers and thunderstorms for each afternoon/evening from Thu through Sun. Afternoons from Wed through Fri also appear to approach windy conditions, below Advisory levels, and finally the increased cloud cover will bring down temperatures closer to normal on Thu, and below normal for Fri and Sat as the low pushes a shortwave through from south to north, with this shortwave nearly closing off and becoming its own upper level low. So the coming weekend will be nothing like the current weekend. Messick && .AVIATION...Occasional clouds coming in at 600mb or higher, which means clouds as low as 9000 AGL. A cirrus shield moves in overnight and continues into Mon, but otherwise limited CIG development. Zero impact on VSBY, with perhaps some showers in the Wood River drainage, making a risk of VCSH at KSUN. KSUN also has some curious wind directions expected, but currently is not verifying in the forecasted directions, so unsure what is going to happen here. The doubt maybe because the nearby showers affect the direction of surface wind. Elsewhere, some wind increases during the overnight with the strengthening of the gradient aloft, with wind from the south. Elsewhere, wind is following very close to diurnal directional changes normally expected. Messick && .HYDROLOGY...Temperatures continue to overperform forecasts, and may be leading to additional melting that may not be accounted for in snow melt models. Very warm temperatures will continue through at least mid-week though the warmest temperatures should occur today and Monday. Forecast water equivalent snow melt for the rest of today through Monday still looks quite high, and river forecasts continue to show a strong response through mid week. Big Wood at Hailey - ACTION STAGE and still expected to reach MINOR FLOOD Monday night or Tuesday morning. This is only slightly later than previously forecast, but probability of reaching MINOR FLOOD has jumped to 88%. Additionally, Warm Springs Creek has been trending higher, and may flirt with ACTION STAGE by mid week if trend extrapolation holds true. The Big Wood further upstream near Ketchum is so far expected to remain below action stage. Little Wood above High 5 Creek - almost entirely within ACTION STAGE now, but still seeing nightly fluctuations into MINOR FLOOD as the daytime melt works into the waterway. If this trend continues, will consider upgrade to FLOOD WARNING. Big Lost River - seeing a response to the melt, but so far the waterways are staying within banks. Exception may be Antelope Creek where the waterway may be at or near bankfull. Willow Creek/Blackfoot River - these two waterways may be very close to bankfull, and will be gages to watch over the next 24 hours, especially given the temperatures today and expected Monday. Portneuf River - the gage at Topaz has leveled off exactly at the threshold for MINOR FLOOD, and should fluctuate right around this level through most of the week. The gage at Pocatello remains in MINOR FLOOD, but is making strides towards reaching MODERATE. Latest probabilities have trended back to about 45% for reaching MAJOR. Further downstream between Pocatello and American Falls Reservoir, the river is rapidly approaching bankfull, and a FLOOD WARNING may be needed to complete the river stretch. Bear River - Projections are still for the Bear at Border to reach MINOR FLOOD Monday night, and bankfull late Monday, flirting with MINOR late in the week. Elsewhere, the Henrys at Rexburg is also showing a slow rise, with potential to reach MINOR FLOOD by next weekend. There is a lot of time to see how this major stem reacts to snow melt and late week precipitation. With all the above in consideration, all products will remain in place as currently issued, with potential upgrades already noted above. DMH && .PIH WATCHES/WARNINGS/ADVISORIES... Flood Watch through Tuesday afternoon for IDZ056>059-061>068-072- 075. &&
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Old Hwy 30 in Inkom was closed from Holstein Street to Main Street because of flooding from Rapid Creek. Flooding caused by snowmelt and extremely warm temperatures.
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, April 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: 1095581.