After receiving more than 6 inches yesterday, parts of the Miami Metro area will again be subject to flooding later Sunday.
One of the first cold fronts to reach South Florida all season will collide with deep tropical moisture. The result will be heavy rain-producing thunderstorms. The heaviest rainfall will likely be across the heavily populated portions of Miami-Dade and Broward counties.
Thunderstorms usually set up just west of the populated areas, across the Everglades. However, the approaching cold front will cause the Atlantic sea breeze to be pinned at the coast, over the populated areas. The sea breeze will collide with westerly winds associated with the cold front to form the thunderstorms.
There is so much moisture in the atmosphere, any thunderstorms that form will be capable of producing 2-4 inches of rain in just an hour.
Heavy rainfall belted the Miami area yesterday. The National Weather Service on the campus of Florida International University received over 6 inches of rain Saturday. Miami International Airport, the official observation site for the city, received 3.70 inches Saturday.
Any rainfall Sunday will fall on saturated ground. So, the threat for flooding under any thunderstorms will be high
Sunday will be the last day of heavy rainfall for Miami. The cold front will try to move through South Florida. But, there will only be a slight drop in humidity. Residents farther north in the state will enjoy a significant drop in humidity.
As July draws to a close, a rare storm system swinging up from the Deep South will bring downpours that will break the back of the heat wave in much of the northeastern United States.
A renewed risk of severe weather will threaten portions of the north-central United States into midweek.
Heavy downpours will raise the concern for flash flooding along the Gulf Coast and lower Mississippi Valley through midweek.
A stifling heat wave will remain entrenched across the Northeast much of this week, despite a brief reprieve in humidity for some.
Dangerous heat will surge northward and send temperatures rising across the northwestern United States this week.
Severe thunderstorms rumbled through the Northeast on Monday, lashing the region with damaging winds while also unleashing heavy downpours that triggered flash flooding.
Hamshire, TX (1989)
A total of 4.46" of rain in two hours (near Port Arthur).
Newark, NJ (1989)
99 degrees -- tied 1940 record.
Cold morning: 39 degrees at Ironwood and Marquette.