Some of the highest temperatures ever measured in April were registered across the heart of Europe during the last week of the month.
The swath of exceptional warmth stretched from Germany and Austria east to Ukraine and central Russia.
Saturday to Monday, high temperatures soared to 28 to 32 degrees Celsius, or 82 to 90 Fahrenheit, which would be significantly above normal even for the height of summer.
Readings were 10 to 15 degrees C above normal for late April.
Sunday, Moscow reached 28.6 C (83.5 F), for the high temperature ever measured in the month of April, the Hurriyet Daily News website said. The earlier high mark was 28 C, registered on April 24, 1950.
Moscow has 130 years of weather records, the report said.
In Austria, the northern district of Lower Austria reached 32 C, or about 90 F, the NTN24 News website said.
The Czech capital of Prague had its hottest 28th of April in 212 years, as a high of 27.7 C (81.9 F) was measured, NTN24 said.
Berlin, Vienna, Warsaw, and Kiev all registered about 30 C (86 F) on the warmest one or two days of the hot spell.
Meteorological information analyzed by AccuWeather.com showed strong high pressure over southeastern Europe steering a mass of air from North Africa to the heart of Europe.
The focus for severe storms will move into the Ohio Valley on Wednesday, bringing the threat for damaging winds, hail and heavy rainfall.
Wednesday will be clearer for recovery and clean up efforts.
The same storm system responsible for producing violent thunderstorms in Oklahoma recently will reach the Atlantic Seaboard Thursday.
Strong thunderstorms impacted areas from Texas and Louisiana to New England with large hail and damaging winds.
The atmospheric severe weather engine began firing on all cylinders this past weekend and reached full speed Monday over Oklahoma.
Preliminary reports are calling it an EF-4 tornado that has caused numerous fatalities and injuries in Moore, Okla.
Liberal, KS (1933)
A powerful F4 tornado (winds 207-260 mph) hidden in a dust storm devastates the business district. 4 people were killed and 150 were injured. Tornado estimated to be 600 yards wide at times.
Hallam, NE (2004)
The "Hallam" tornado touched on the ground for 2.5 miles and reached F4 status at it's peak intensity. 95% if the town of Hallan's buildings were damages or destroyed.
Southwestern & Central OK (1996)
Sinking air from dying thunderstorms cause unusual late night rise in temperature. Many places rose from upper 80s at 11:00PM to near 100 degrees by 3:00AM.