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).
As temperatures rise through the weekend in the South, so will the risk for heat-related dangers.
While heavy rainfall inundated the Phoenix area with historic flooding, deadly landslides occurred in Japan, claiming dozens of lives.
While a tropical low is expected to brew into Tropical Storm Cristobal this weekend, the East Coast of the U.S. is being monitored for future impacts -- even if the storm remains well offshore.
United States residents may pay higher heating costs this fall as colder air is expected to grip the Rockies and Plains at times and some quick-hitting chilly shots may impact the Northeast.
A swath of soaking rain will slowly shift from the northern Plains to the Canadian Prairies this weekend, making people reach for their umbrellas and heightening concerns for flooding.
While residents will face more disruptions to outdoor activities on Saturday, dry air will push southward across Pittsburgh to end the weekend.
Boston, MA (1851)
Track of tornado - Waltham, Belmont, Arlington (see other 1843 stories around this time). Apparently caused by excessively humid S or SW flow at western edge of a Bermuda high.
Woodland, WI (1857)
42 miles west of Milwaukee at night - "Every building save one blown down; freight cars blown off the track."
San Lorenzo, Puerto Rico (1906)
103 degrees, hottest ever in Puerto Rico.