This Day in National/World Weather History ...
 21 August 1883 → What was likely an F5 tornado devastated the north side of Rochester, MN. The tornado derailed a train and leveled farms. 40 people were killed.
 21 August 1888 → A "grand spectacle" of four waterspouts near Jacobson, MD overturned boats and moved ashore. 15 people were injured. Another tornado moved east-northeast near Still Pond, MD killing 10 people in a cannery. A total of 11 deaths and 40 injuries were reported from this tornado.
 21 August 1918 → Tyler, MN suffered a direct hit by an F4 tornado. Six hundred buildings were damaged or destroyed and 36 lives were taken, including three when the town's hospital was struck.
 21 August 1984 → The State Fair in Pueblo, CO had to be closed during a vicious hailstorm. Nine people were hurt, including one seriously.

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May 1, 1959:

Aberdeen recorded a high temperature of 102, which is the earliest date that Aberdeen reached 100 degrees.

May 1, 1967:

The latest blizzard ever record for South Dakota ended on this day. Snowfall amounts in the west were generally 5 to 12 inches with a 16 inch report in Lemmon and 30 inches in the northern Black Hills. Winds of 40 to 50 mph caused blowing snow which occasionally reduced visibility to near zero and snow drifts of 4 to 5 feet. Other snowfall amounts include, 5 inches in Murdo and 6 miles SE of McIntosh; and 4 inches in Timber Lake.

May 1, 1997:

Heavy rains of 1.5 to 2.5 inches with an isolated 4.5 inch report fell over central South Dakota and caused flooding to several creeks, streams, low-lying areas, and roads. This early May rain only aggravated the areas flooded in March and April. Lyman County experienced the most significant flooding where 4.5 inches of rain fell, north of Vivian. Part of a golf course was flooded and some personal property was flooded along with the KOA campground near Kennebec. Some rainfall amounts include, 2.5 inches 7 miles NW of Presho, and 2.01 inches near Stephan.


Record Highs: Record Lows:
Aberdeen: 102 (1959) Aberdeen: 19 (1961)
Kennebec: 102 (1959) Kennebec: 11 (1906)
Mobridge: 92 (1959) Mobridge: 23 (1961)
Pierre: 98 (1959) Pierre: 22 (1961)
Sisseton: 98 (1959) Sisseton: 24 (1966)
Timber Lake: 92 (1992) Timber Lake: 20 (1950)
Watertown: 95 (1959) Watertown: 18 (1961)
Wheaton: 99 (1959) Wheaton: 21 (1961)

Record Precipitation: Record Snowfall:
Aberdeen: 0.95" (1949) Aberdeen: 0.3" (1967)
Kennebec: 1.25" (1983) Kennebec: 2.3" (1967)
Mobridge: 2.38" (1972) Mobridge: 1.7" (1967)
Pierre: 2.13" (1972) Pierre: 1.0" (1967)
Sisseton: 1.08" (1935) Sisseton: Trace (2011)
Timber Lake: 1.70" (2008) Timber Lake: 5.0" (1956)
Watertown: 1.77" (1972) Watertown: Trace (2011)
Wheaton: 0.99" (1923) Wheaton: Trace (2011)


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