Outbreaks of heavy rain will threaten to cause serious flooding across much of Southeast Asia and south China through at least the middle of next week.
Bolstered by a stream of water-laden tropical air from the eastern Indian Ocean, drenching thunderstorms will break out widely in a swath from southern Myanmar and northern Thailand eastward through northern Vietnam and a great deal of south China, even Taiwan.
Rainfall of 2 to 4 inches, enough to cause spotty flooding, will be common. However, localized falls of rain reaching 10 inches or more will happen, and it is these outbursts that could spark serious flooding.
May is the month during which rainfall normally rises steeply from its climatological winter minimum to its summer maximum across a wide swath of southeastern Asia to south China. Instances of flooding, even serious flooding, are not unusually beginning in May.
Early May flooding has already led to loss of life and displacement of many people in the south China provinces of Guangdong and Guangxi, it has been reported in the news media of China.
Record-challenging heat will continue in Seattle through midweek before temperatures return to normal.
Above-normal temperatures will be the story around the Bay area to kick off the new week.
Unsettled weather in Atlanta will continue into this week, with the chance of thunderstorms remaining for the area through Tuesday.
After showers and thunderstorm come through the area on Monday, Detroit will see a period of slightly cooler temperatures for much of the week.
After the new week begins with stormy weather, the Cleveland area will see temperatures reminiscent of September move in midweek.
Dallas will see continued periods of heat and dry weather before severe storms bring cooler temperatures midweek.
Greensboro, NC (1979)
78 degrees -- all-time record high minimum.
Montreal, Quebec (1987)
Severe thunderstorms led to flash flooding and many accidents. Widespread damage; two people were killed. A power outage left dozens stranded in subways overnight.
Mason County, OH (1997)
About 5" of rain fell in 2 hours. Many basements flooded. 135 cars in a parking lot at King's Island amusement park were damaged.