Locally Heavy Rainfall for the Carolinas; Thunderstorms and Fire Weather Concerns for Intermountain West

Heavy rainfall from scattered thunderstorms is expected across the Southwest, Intermountain West, and Plains. Isolated dry thunderstorms may initiate additional fires across the west. The coastal Carolinas may experience flash floods in the coming days due to repeated thunderstorms. Additionally, a wave of intense summer heat will hit the Southern Plains and central Gulf Coast States this week. Read More >

Three wet microbursts were identified within a squall line that moved through the Sioux Falls area during the early morning hours of June 11th. A microburst is essentially an area of strong surface winds which are accelerated to the ground from aloft in a thunderstorm, and a wet microburst is that which is accompanied by falling precipitation. For a more extensive review of the damage, please see our damage survey. The following image displays the locations damage across the city, as well as the tracks of the three microbursts, represented by the orange, purple, and red rings. The orange and purple tracks likely extended further into central portions of the city, but cannot be identified due to limited radar coverage.

Map showing wind damage throughout Sioux Falls from microburst

These reports are summarized in this table, which lists the damage sustained, the estimated wind speed (if available), and the latitude and longitude of the damage.

Description	Speed	Latitude	Longitude
Damage to homes	100 mph	43° 30' 29" N	96° 49' 30" W
Large tree down	65 mph	43° 30' 33" N	96° 48' 38" W
Branches down	60 mph	43° 30' 34" N	96° 48' 35" W
Tree damage	60 mph	43° 30' 27" N	96° 49' 53" W
Large tree down		43° 30' 27" N	96° 46' 16" W
Power lines down		43° 32' 15" N	96° 42' 23" W
Tree down		43° 30' 50" N	96° 43' 28" W
Tree down		43° 30' 50" N	96° 43' 29" W
Tree down		43° 33' 34" N	96° 45' 18" W
Tree down		43° 30' 54" N	96° 43' 25" W
Tree down		43° 31' 59" N	96° 42' 41" W
Tree down		43° 32' 07" N	96° 42' 27" W
Tree down		43° 32' 55" N	96° 32' 37" W
Tree down		43° 32' 25" N	96° 41' 00" W
Branches down		43° 32' 16" N	96° 42' 22" W
Branches down		43° 32' 12" N	96° 41' 57" W

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Locally Heavy Rainfall for the Carolinas; Thunderstorms and Fire Weather Concerns for Intermountain West

Microburst tracks across Sioux Falls - June 11, 2010