1951: Deepening storm over Illinois on April 11-12, 1951. Click HERE for more information from the Monthly Weather Review.
— NOAA Research (@NOAAResearch) April 11, 2017
1965: Severe thunderstorms in the Upper Midwest spawned fifty-one tornadoes killing over 250 people and causing more than 200 million dollars damage. Indiana, Ohio and Michigan were hardest hit in the “Palm Sunday Tornado Outbreak.” Although no F5’s were officially reported, at least 22 were rated as F3 or F4. This is the third deadliest day for tornadoes on record, behind the Super Outbreak of 4/3/1974, and the outbreak that included the Tri-State Tornado of 3/18/1925. Dr. Ted Fujita discovered suction vortices during the Palm Sunday tornado outbreak. It had been believed the reason why tornadoes could hit one house and leave another across the street completely unscathed was that the whole tornado would “jump” from one house to another. However, the actual reason is that most of the destruction is caused by suction vortices: small, intense mini-tornadoes within the main tornado.
1979: A second tornado outbreak in two days struck Arkansas.
— NWS Little Rock (@NWSLittleRock) April 11, 2017
2011: Iowa saw 28 tornadoes on this day in 2001, a single day record.
— NWS Des Moines (@NWSDesMoines) April 11, 2017
2012: The deluge began around 3:30 a.m. Over the next few hours, fast-moving hailstones pummeled the area north of Amarillo, Texas, which had lately been sitting in dust due to a lack of precipitation, according to the news organization. The hail mixed with melting hail turning the dust to mud and the mix create four-foot high mounds that shut down a major highway for the next 18 hours.
Source: NBC News.
2016: On the afternoon and evening of April 11th, 2016, an intense supercell thunderstorm traversed North Texas roughly from Wichita Falls to Tyler. This storm will be remembered for the massive hail it produced, especially in the city of Wylie where 80% of homes were affected, and over $300 million in damage occurred. Fortunately, only a few minor injuries were reported.
— NWS Fort Worth (@NWSFortWorth) April 11, 2017
2017: Cool moonrise near the Jefferson Memorial.
Moonrise tonight near the Jefferson Memorial in Washington, DC pic.twitter.com/drDAq84Vu8
— Chris Duncan (@CTDPIX) April 12, 2017
2017: Lots of bats were observed by radar in South Carolina.
Tonight, KGSP has a new one for the “weird things seen on radar” file…bats, and lots of them! pic.twitter.com/b94LwI7CCF
— NWS GSP (@NWSGSP) April 12, 2017