Several roads were closed by Blaine County Road and Bridge on April 8th in Hailey due to heavy snow melt. They were Parker Gulch, Rock Creek Rd, W.
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The episode as NWS PIH wrote it up.
Several roads were closed by Blaine County Road and Bridge on April 8th in Hailey due to heavy snow melt. They were Parker Gulch, Rock Creek Rd, W. Glendale Rd, Road Canyon, Meacham Lane, and Dry Creek Rd.
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 8, 1:37 AM MST, 6 hours 23 minutes earlier.
Area Forecast Discussion National Weather Service Pocatello ID 237 AM MDT Mon Apr 8 2019 .SHORT TERM...Today through Wednesday Current satellite imagery this morning showing mostly clear skies over the local area. This is due to the atmospheric river taking aim a little further north than previously forecast. This will only serve as a delay to the heavier precipitation expected later today for the central mountains. Have trimmed back the PoPs and qpf accordingly through about 18z today before ramping back up tonight this afternoon. This moisture stream won't really move further south toward the Snake Plain, until it has a reason to. That impetus comes in the form of a landfalling shortwave trough near coastal Oregon. Bolstered by a favorable upper-level wind field, and surface- based instability to the tune of low-level lapse rates around -10 C/km, precipitation will take on a convective mode this afternoon/evening. There will be at least a slight chance of lightning area wide today, but the Snake Plain should be able to scrape together enough moisture this evening to support more mature thunderstorm growth in a high shear/low CAPE environment. For this reason, have included the mention of scattered thunderstorms with gusty winds and cannot rule out some more small hail like we saw a few days ago. A cold front will then cross the area Tuesday, keeping precipitation chances high across the area. The focus of the heaviest precipitation will shift to our eastern and southern highlands where we could see over half an inch of liquid by Wednesday. Inserted a mention of thunderstorms east of I-15 Tuesday as the frontal zone moves through that area. Snow levels will drop dramatically from above 9,000ft today down to below 5,000ft Tuesday night. This will allow for a transition to all snow Wednesday morning with some mountain accumulations. With such a swing in weather in the works, winds will undoubtedly be an issue over the next few days. Another breezy day is expected through the Snake Plain and mountain peaks today with strong mixing. While mixing will be strong today, it doesn't appear strong enough to support the need for a Wind Advisory. Winds will only increase along and behind the cold front slated to come through Tuesday. The eastern Magic Valley and lower Snake Plain look to be nearing the threshold for a Wind Advisory Tuesday afternoon/evening. All of these potential weather impacts come in addition to the ongoing flood potential outlined further in the Hydrology section below. TAX .LONG TERM...Wednesday night through next Monday. Precip chances will be waning Wednesday night as low pressure exits to the east and high pressure builds from the west. The dry conditions will be short- lived though because northwest flow in our mid-levels will bring in a new upper low by mid-day Thursday. Snow levels by this time will be dropping around 4500 ft; therefore allowing the possibility and even likelihood for snow at valley floors. We will all need to be monitoring snow probabilities during the Thursday evening commute. Snow does not necessarily need to accumulate on roadways to cause an impact! Snow may even continue through Friday morning; though the chances for precip start to decrease by the morning hours. Forecast models paint quite a different picture by Friday. The progression of a closed upper low that may develop will have a significant impact to our forecast Friday and into the weekend. The European solution chooses to quickly track the upper low southbound into California by early Friday morning, leaving Idaho to dry out through Saturday. The American solution (GFS), tracks the low on a more leisurely southeastward track across Wyoming and Colorado Friday and Saturday, leaving Idaho rather moist. We will opt to leave low end chances for precip in our forecast for Friday but dry us out Saturday. It is also worth noting that Friday's forecast may have a thunderstorm during the afternoon/evening hours. A new shortwave trough is forecast to track through Idaho late Saturday through Sunday, increasing chances for rain and snow once again. NP && .AVIATION...VFR conditions exist across the area and should remain through much of the day. This is despite a stream of Pacific moisture taking aim just north of the central ID mountains this morning. We're expecting an organized system to start moving inland later this afternoon pushing this moisture further south into the central mountains and eventually the Snake Plain. Fueled by increasing instability and a strengthening wind field, we should see thunderstorm development which could impact all airfields this evening. With any thunderstorms, we could see brief visibility restrictions, along with gusty and erratic winds and maybe some small hail. Outside of any thunderstorms, we're looking at another windy day for area ports. The llws currently in the SUN TAF will eventually translate to the surface after daytime mixing commences. Similar to what was observed yesterday, we're calling for southwesterly winds sustained 15-20kts and gusts above 25kts across the Snake Plain. The more sheltered ports of SUN/DIJ may not see strong winds materialize fully. TAX && .HYDROLOGY...Flood watch issued for central mountains and eastern highlands. The flood watch begins tonight and continues through Tuesday for the Bellevue to Stanley area. The heavier rain hold off across the other high country areas until Monday night. Rainfall totals of 0.50 to 1 inch are likely across much of the watch area with snow levels rising to around 9000 feet by Tuesday. The potential for heavy rain on snow could create sudden rises on creeks and streams, especially smaller tributaries that may not have river gauges on them. Colder air arrive Tuesday afternoon and Tuesday night which should slow runoff. Valle && .PIH WATCHES/WARNINGS/ADVISORIES... Flood Watch through Tuesday evening for IDZ072-073-075. Flood Watch from this evening through Tuesday evening for IDZ058>071-074. &&
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Several roads were closed by Blaine County Road and Bridge on April 8th in Hailey due to heavy snow melt. They were Parker Gulch, Rock Creek Rd, W. Glendale Rd, Road Canyon, Meacham Lane, and Dry Creek Rd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2019Every state in 2019This day in weather historyWarnings in Idaho, April 2019
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: 820161.