RSS FeedsHydrologic Summary for June 2004 for the Area Served by the NWS Forecast Office at Sioux Falls, SD
Summary
June saw a normal wide range of conditions, especially in rainfall. Most of the region saw cool conditions, with precipitation totals ranging from much below to much above. Strong slow moving thunderstorms did produce a few rounds of flash flooding and river flooding in June.
Flooding
There was one very significant flash flood event in June. Early in the morning on the 16th, thunderstorms formed over Sioux Falls and continued redeveloping in the same area. Three to six inches of rain fell in 2 to 4 hours over parts of the city resulting in significant flash flooding. Considerable damage resulted in several parts of town. Later that morning in to the afternoon, another round of slow moving storms developed around Sioux City and moved slowly east. Two to five inches of rain fell from these storms producing additional flash flooding. Parts of southwest Minnesota also received heavy rainfall on the 16th, which resulted in minor flooding of area rivers and creeks. The only significant river flooding in June occurred along the lower Big Sioux River. This was a result of the runoff from the heavy rains that fell at the end of May, with the water reaching the Hawarden and Akron areas during the first few days of June. Please refer to the table at the bottom of this report to get more information on flooding of gauged rivers in June.
General Hydrologic Information
Temperatures in June were below normal across the region. Average temperatures for the month ranged from 2.5 to 4.5 degrees below the 30 year average.Despite locally heavy rains, precipitation for the month averaged below normal for most areas. Monthly totals ranged from 1 inch to over 7 inches, which is as much as 4 inches above normal. On average, precipitation totals were generally 0.5 to 1.5 inches below normal. Some of the largest monthly rainfall totals for June were 7.91 inches at Holstein IA, 6.41 inches at Galva IA, 6.33 inches in northern Sioux City IA, 6.15 inches at Ida Grove IA, 6.00 inches at the Sioux Falls airport, 5.75 inches at Tracy MN, 5.69 inches at Academy SD, and 5.50 inches at Emerson NE.
Soil Moisture conditions at the end of May were near normal for most of the region. Deficits of around 1 inch were still being reported in the extreme western areas along the Missouri River. The National Drought Monitor indicated moderate to severe drought conditions persisting in the extreme western areas, with near normal conditions across the rest of the region.
Mike Gillispie
July 12, 2004
July 12, 2004
FLOOD STAGE REPORT JUNE 2004
RIVER/STATION FLOOD ABOVE FLD STG CREST
STAGE FROM-TO STAGE DATE
PIPESTONE CREEK
PIPM5 16.0 6/16-6/16 17.55 6/16
BIG SIOUX RIVER
HAWI4 15.0 cont-6/3 18.1 6/1
6/17-6/19 15.5 6/18
AKRI4 16.0 6/1-6/3 17.85 6/2
VERMILLION RIVER
DVSS2 11.0 cont-6/1 12.40 6/1
FIRESTEEL CREEK
MTVS2 8.0 6/12-6/13 8.41 6/12
ROCK RIVER
HRDM5 14.0 6/17-6/17 14.31 6/17
REDWOOD RIVER
RUSM5 14.0 6/17-6/18 14.69 6/17
