Heavy Rain in Pondera County, Montana
Heavy Rain May 20, 2020 · Pondera County, Montana
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Rainfall total for 24 hours (7 AM Tuesday 5/19 to 7 AM Wednesday 5/20) was 1.75 inches.
The wider storm
A broad closed upper level low moved onto the California/Oregon coast and eventually swung northeastward through Western Montana. South to southwesterly flow ahead of this system pumped in moisture and unstable air, while diffluent flow at H300 provided upper level support. This initially brought scattered severe wind gusts and hail to portions of Central and North-central MT on May 18th and 19th. As the general forcing associated with the low approached the state on the 20th, the event transitioned to a more of a moderate to heavy stratiform rain event for all areas, although some severe weather was still reported.
Began near Ledger (48.2700, -111.8200).
Source: NOAA Storm Events Database, event 889396. Narratives are written by the National Weather Service forecast office that issued the report.
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