Sep 11, 2009
A weak upper disturbance moved slowly southward over southern New Mexico and far west Texas within a moist, unstable air mass. An approaching jet streak from the west along with low level easterly flow provided favorable vertical wind shear and sufficient lift for a severe weather outbreak.
Source: NOAA National Weather Service Storm Events Database (event 196996). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Sierra County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.