ESFTFX What: Widespread heavy rainfall Saturday into Monday. Where: Mostly the western portion of North Central MT. Timing: The heavier rainfall will begin on Saturday and then diminish on Monday. Rainfall rates of around 0.50 to 0.75 are possible every 6 hours over a 36 hour period. Relevant factors: Overall, total precipitation amounts for most areas will range from 1 to 2 inches. About 10 percent of the area will receive closer to 3 inches of rainfall. In terms of flooding, given the recent dry period, most of the area will be handle the first few inches of rainfall. However, areas that receive 3 or more inches of rainfall could start to have impacts. Additionally, there is still a minor snowpack left in the mountains that could add to runoff concerns as the remaining snow washes out. Thus some flood statements might be needed later this weekend should flooding develop over the Plains or along rivers. Everyone is reminded that should flooding develop, regardless if the roadway is paved or not, do not drive through any flood waters, as you do not know if the road has been washed out under the flood waters. Please monitor the National Weather Service or the local media this weekend for further updates on this spring storm.
ESFTFX What: Heavy heavy rainfall Saturday into Monday. Where: Greatest impacts will be along and west of the I-15 corridor of North-Central MT. Timing: The window for the heaviest rainfall will be between Saturday afternoon through Sunday morning. Here, rainfall rates of 0.5" to 0.75" every 6 hours are possible. Light to moderate rainfall lingers through at least Monday. Details: Rainfall amounts range from 1 to 3 inches for the area, with a 10% chance for 4 inches along and west of the I-15 corridor. Additional snowmelt runoff from the Rocky Mountain Front can enhance creek and river rises including but not limited to the Sun River, Marias River, and Saint Mary River. Low lying-areas and poor drainage areas are also at risk for flooding. Rural dirt roads will be susceptible to become washed out or impassable. Due to increasing confidence in flood impacts, a Flood Watch was issued for areas along and west of the I-15 corridor for North-Central MT Saturday through Monday. Rivers and creeks are expected to crest Monday, which can linger impacts for areas prone to river/creek flooding. Areas farther east of the I-15 corridor are expected to see lesser flood impacts. Everyone is reminded that should flooding develop, regardless if the roadway is paved or not, do not drive through any flood waters, as you do not know if the road has been washed out under the flood waters. Please monitor the National Weather Service or the local media this weekend for further updates on this spring storm.
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