Extreme rain resulted in flooding across the Northeast on Sunday. Records were smashed, including an all-time record rainfall at the JFK International Airport in NYC.
The New York City JFK Airport set the wettest day on record with 7.80 inches on Sunday. This smashed the all-time daily rainfall record of 6.27 inches on June 30, 1984. The old daily rainfall record was 0.96 of an inch of rain set in 2008.
The normal rainfall for the month of August at the JFK Airport is 3.68 inches, so nearly twice the normal monthly rainfall was delivered in one day.
Cars submerged under floodwaters in Staten Island, New York City on Sunday August 14, 2011. Photo courtesy of AccuWeather.com Facebook fan Mike B.
The excessive rainfall amounts in the Northeast with this storm are more on par with the rain from a tropical storm or a hurricane. Significant flooding resulted in many communities. Many roads were closed and swift water rescues performed as flood waters rose quickly.
Topping the list of excessive rainfall amounts, Lido Beach, N.Y., got an astounding 10.87 inches of rain.
Newark, N.J., was deluged by 6.40 inches of rain. This broke the old rainfall record of 1.11 inches set in 1999.
Philadelphia got 4.84 inches of rain on Sunday, shattering the old daily rainfall record of 1.77 inches set in 1977. The inundating rain surpasses the normal monthly rainfall of 3.50 inches.
More daily rain records set on Sunday:
-New York City (LaGuardia Airport): 6.60 inches; old record 3.51 inches/2005
-New York City (Central Park): 5.81 inches; old record 3.10 inches/2005
-Islip, N.Y.: 5.31 inches; old record 1.04 inches/1994
-Trenton, N.J.: 4.66 inches; old record 3.40 inches/1999
-Bridgeport, Conn.: 2.75 inches; old record 1.79 inches/1999
Contributing Factors to the Flood Situation
The main reason for the flooding is that the storm system that has been unleashing the rainfall moved very slowly across the mid-Atlantic, allowing torrential downpours to keep moving across the same areas repeatedly.
The storm system was able to tap into moisture from both the Gulf of Mexico and the Atlantic.
Unfortunately, the storm system will skirt slowly up the Northeast Coast through tonight, allowing more heavy rain to pour down and aggravate flooding.
Another factor of the flooding is the fact that there has been a very dry pattern set up across the Northeast this summer. When there has been a dry pattern in place, water is not able to penetrate the parched soil as easily.
The U.S. Drought Monitor release on Aug. 9, 2011, shows abnormally dry to moderate drought conditions across portions of the Northeast. The dry conditions are likely a contributing factor to some of the flooding.
The total of 7.80 inches of rain that fell at the JFK International Airport is almost as much rain that fell during the months of May, June and July combined (7.96 inches).
A major Thanksgiving Day storm threatens to ruin holiday events across the Central states with flooding rain, snow, a glaze of ice and fog.
Sandra remains on track to target northern Mexico Friday and Saturday, but it should be much weaker at landfall than its current major hurricane status.
Unsettled weather will stretch across the United Kingdom on 27th November as millions set out in search of the best Black Friday deals on offer.
Travel hazards, delays and disruptions associated with rain, ice and snow will continue over the Central states through the balance of the Thanksgiving weekend.
Compared to Thanksgiving Day in 2014, this Thanksgiving will be substantially warmer in the Northeast.
Wet weather will stretch from Texas to Michigan and could impact shoppers and slow travel during Black Friday.
North Dakota (1896)
Thanksgiving Day Blizzard. "Wind Velocity and snowfall never equalled before."
Destructive windstorm in the Northwest; winds gusting to 105 mph in Cut Bank, MT; 96 mph in Sheridan, WY. Spokane, WA, radio tower downed. Coleville, WA, lumber shed demolished.
Barst, Guadeloupe (1970)
1.50 inches of rain in 1 minute -- world record.