21 May in history



Station data

Station Data

Records


-- no data for this day --


Statistics

Average temperature
The average temperature on this day is 13.13 °C.
Maximum temperature
The maximum measured temperature on this day was 25.1 °C in 2018 at 3:40 pm.
Minimum temperature
The minimum measured temperature on this day was 4 °C in 2018 at 5:30 am.
Average humidity
The average humidity on this day is 84.16 %.
Maximum humidity
The maximum measured humidity on this day was 100 %.
Minimum humidity
The minimum measured humidity on this day was 43 % in 2018 at 11:50 am.
Maximum pressure
The maximum measured pressure on this day was 1024.2 hpa in 2017 at 9:30 am.
Minimum pressure
The minimum measured pressure on this day was 1005.8 hpa in 2016 at 4:15 pm.
Average wind speed
The average wind speed on this day is 2.13 mph.
Maximum wind speed
The maximum measured wind speed on this day was 9 mph in 2017 at 2:00 pm.
Average wind gust
The average wind speed on this day is 4.93 mph.
Maximum wind gust
The maximum measured wind gust on this day was 18.1 mph in 2016 at 9:40 am.
Maximum precipitation
The maximum daily precipitation measured on this day was 13.4 mm in 2016.


US Weather Events

US Weather Events

1860 159 yrs ago
A swarm of tornadoes occurred in the Ohio Valley. Tornadoes struck the cities of Louisville, KY, Cincinnati, OH, Chillicothe, OH, and Marietta, OH, causing a million dollars damage. (David Ludlum)
1895 124 yrs ago
The temperature at Norwalk, OH, dipped to 19 degrees to set a state record for the month of May. (The Weather Channel)
1896 123 yrs ago
The mercury soared to 124 degrees at Salton, CA, to establish a U.S. record for May. (Sandra and TI Richard Sanders - 1987)
1980 39 yrs ago
The temperature at Williston ND reached 102 degrees to set a record for May, and the next day the mercury hit 106 degrees. (The Weather Channel)
1987 32 yrs ago
Severe thunderstorms, developing along a sharp cold front crossing the central U.S., produced 60 mph winds and golf ball size hail at Sedalia, MO, and drenched Hagerstown, IN, with six inches of rain in one hour. Temperatures soared into the 90s ahead of the cold front. Paducah, KY, hit 94 degrees for the second day in a row. Light snow blanketed Montana, with three inches reported at Butte. (The National Weather Summary)
1988 31 yrs ago
Severe thunderstorms swept across southern Louisiana during the morning hours spawning six tornadoes, and producing wind gusts to 88 mph at Jennings. Thunderstorms also produced five inches of rain in two hours at Lake Charles, causing local flooding. (The National Weather Summary)
1989 30 yrs ago
Thunderstorms moving southeastward across the Central Plains Region into Oklahoma and Arkansas produced severe weather through the day and night. Thunderstorms spawned just four tornadoes, but there were 243 reports of large hail and damaging winds. Baseball size hail was reported at Augusta, KS, and thunderstorm winds gusted to 98 mph at Johnson, KS. (The National Weather Summary)
1990 29 yrs ago
Thunderstorms produced severe weather across the southeastern U.S. for the second day in a row. Severe thunderstorms spawned five tornadoes, including one which injured a person at Richmond KY. There were eighty-seven reports of large hail or damaging winds, with hail three inches in diameter reported at Austin TX. Thunderstorms produced up to five inches of rain in Macon County GA, and heavy rains left nearly eight feet of water over roads near Stepstone KY. (The National Weather Summary)
Data source: http://www.weatherforyou.com/


World Records

World Records


-- no data for this day --


F5 tornadoes

F5 tornadoes

1918 101 yrs ago
Crawford–Greene County, Iowa 2013 fatalities
At least two farms were swept away, and house foundations were left bare. Mattresses from the homes were transported 2 mi (3.2 km).
Rated F5/EF5, or mentioned as a possible F5/EF5 by tornado expert Thomas P. Grazulis
1918 101 yrs ago
Boone–Story County, Iowa 2010 fatalities
A large tornado completely swept away two entire farms. Mentioned as a possible F5 by Grazulis.
Rated F5/EF5, or mentioned as a possible F5/EF5 by tornado expert Thomas P. Grazulis
1949 70 yrs ago
Palestine, Illinois 2015 fatalities
A restaurant was leveled, and cars in the parking lot were thrown up to 300 yd (900 ft) away from where they originated.
Listed as an F5/EF5 on the 2000 NCDC tornado climatology memo
1957 62 yrs ago
Fremont, Missouri 2012 fatalities
May 1957 Central Plains tornado outbreak – Most of Fremont was destroyed, with many structures swept away. Possible F5 damage occurred to schools, homes, and businesses near the railroad tracks, but could not be verified due to poor quality of construction.
Rated F5/EF5, or mentioned as a possible F5/EF5 by tornado expert Thomas P. Grazulis


Deadly earthquakes

Deadly earthquakes

21.05.1932 10.10 am UTC 87 yrs ago
Nicaragua (map) , 35 km deep Magnitude: 6.9 UK
Total deaths resulting from an earthquake (Utsu catalog)10

21.05.1950 06.37 pm UTC 69 yrs ago
Peru (map) Magnitude: 6.0 UK
Total deaths resulting from an earthquake (Utsu catalog)120

21.05.1984 03.37 pm UTC 35 yrs ago
China (map) , 43.8 km deep Magnitude: 6.0
Total deaths resulting from an earthquake (Utsu catalog)13

21.05.1995 06.13 am UTC 24 yrs ago
Indonesia (map) , 26.4 km deep Magnitude: 5.2
Deaths resulting from earthquake shaking1
Total fatalities resulting from earthquake shaking and secondary effects1
Total deaths resulting from an earthquake (Utsu catalog)1

21.05.1997 10.51 pm UTC 22 yrs ago
India (map) , 36 km deep Magnitude: 5.8
Deaths resulting from earthquake shaking38
Total fatalities resulting from earthquake shaking and secondary effects38
Total deaths resulting from an earthquake (Utsu catalog)38
Total deaths resulting from an earthquake (Emergency Events Database)43

21.05.1997 11.50 pm UTC 22 yrs ago
Spain (map) , 17.1 km deep Magnitude: 5.3
Deaths resulting from earthquake shaking0
Total fatalities resulting from earthquake shaking and secondary effects1

21.05.2003 06.44 pm UTC 16 yrs ago
Algeria (map) , 12 km deep Magnitude: 6.8
Secondary effectstsunami, landslide, liquefaction
Deaths resulting from earthquake shaking2266
Total fatalities resulting from earthquake shaking and secondary effects2266
Total deaths resulting from an earthquake (Emergency Events Database)2266



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