They had some help from two volunteers. at Sassamansville Rd. Updated Aug 04, 2020; Posted Aug 04, 2020 . Water levels rose 4.3 feet in only 10 minutes, helping to rapidly inundate low-lying homes and businesses and area roadways. Middle Creek Road in Gilberstville looked more like a river than a street.
Severe thunderstorms brought hail, wind and life-threatening flash flooding to the greater Philadelphia area Monday afternoon, prompting the National Weather Service to issue a rare “flash flood emergency.” Cars were reported completely submerged beneath floodwaters in the Cheltenham suburb of Philadelphia, while water rescues were ongoing about 3 p.m. north of the city in Abington. Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook.
A Flash Flood Watch has been issued for portions of Columbia County and Schuylkill County until 10 p.m. Wednesday.
The National Weather Service put large parts of the region under flash flood warnings. With weak steering flow and a very buoyant low-level thermodynamic environment, updrafts rapidly deepened, generating severe, slow-moving thunderstorms. Please try another search. The most important news stories of the day, curated by Post editors and delivered every morning. This time was notable for the especially symmetrical outflow emanating from the main cluster of thunderstorms, as well as the lone severe storm over the Pocono region which developed independently of the storms to the south. Folks who live along Middle Creek and Sassamansville Road say flooding is nothing new, but not like this. This video shows street flooding in Bridgeport, Pennsylvania, on Tuesday, as heavy rain pours down. The core of the storms largely dodged the airport, however, which only picked up 0.18 inches of rain as of 4 p.m. Interaction with a sea breeze boundary was also helping initiate the thunderstorms over eastern New Jersey. Even water only six inches deep, when moving at a high rate of speed, can knock you … Additionally, the storms produced hail up to golf ball size in northern Philadelphia, Bucks, and Mercer Counties.
Large hail up to ping pong ball size was reported very soon after near Edison.
The greatest totals are near and west of the I-95 corridor.” Areas of flash flooding were expected, especially in urbanized and flood-prone areas, the Weather Service said. Route 309 south near Quakertown was flooded. Figure 6: KDOX radar reflectivity factor (top left), storm relative velocity (SRM; top right), spectrum width (SW; bottom left), and correlation coefficient (CC; bottom right) valid at 2319 UTC on 6 July 2020, shortly before a tornado warning was issued for this storm. At this time, a velocity couplet is still present, but the magnitude of rotation has weakened considerably. That produced a circular “outflow boundary,” or ring of cool thunderstorm “exhaust,” that surged outward in all directions. Success! NWS Mount Holly reported 4.6 inches (116.84mm) of rain in Boyertown, Berks County PA and 4.62 inches (117.35mm) in Gilbertsville, Montgomery County PA. Heavy rains pounded parts of the viewing area Thursday, causing flash flooding. VIDEO: Middle Creek Rd. The first thunderstorms explosively developed in central New Jersey about 2 p.m., those storms standing still and ultimately collapsing. Multiple locations were found. That meant individual storms were not likely to last long, but clusters could persist as one updraft would collapse and kick up a separate updraft nearby. Facebook Share. Heavy rain and flash floods hit Pittsburgh, leaving residents on alert Thousands are without power in the sweltering heat with a possibility of more rain to come. During that same time frame Monday afternoon, the creek’s water flow rate increased by a factor of 350. in Gilbertsville turning cars around so people don't get stuck in the flooding @69News pic.twitter.com/H3GCmFIwDb, -- Julia Rose (@JuliaRoseNews) July 11, 2019. Emergency crews were hard at work rescuing cars and closing down roads.
A few passing showers; otherwise, still cloudy, but not as cool.
Composite radar loop of the annular convection on 6 July 2020. While most of the area received measurable rain, the amounts varied widely from place to place.
With intense rain rates of 3+ inches per hour, rainfall accumulations of 3-6 inches occurred within a 2-hour period in southeast Montgomery and northern Philadelphia Counties.
A June derecho blasted Philadelphia region with 80 mph winds, with damaging supercell storm just hours later.
Get local Breaking News alerts sent directly to your inbox. A comparison of radar estimates to observations revealed that radar generally did a good job estimating rainfall for this event. Flash flooding swallowed roads in Bucks and Montgomery counties. @69News pic.twitter.com/MmsqFqQ2aL. At 3:12 p.m., the creek crested at 9.73 feet, just shy of the 10-foot “major” flood stage. Widespread reports of wind damage and hail occurred with these storms, and isolated instances of flash flooding were reported where localized training developed. Get up-to-the-minute news sent straight to your device. Morristown, New Jersey, was particularly hard hit, with several reports of wind damage and road closures from flash flooding. You have permission to edit this article. Veronica Brickson and her father-in-law decided to stand along Sassmansville Road and turn people around, stopping people from a dangerous situation. Rainfall rates in Monday’s storms probably exceeded three inches per hour, a result of the exceptionally warm and humid air mass in place. The flow rate of Frankford Creek increased 35,000 percent. Eventually, more organized convection developed in Delmarva during the evening hours, with a bowing structure producing numerous reports of wind damage in eastern Maryland into far southwest Delaware. Motorists were stranded in cars and some vehicles were submerged Monday when torrential rain Note that this page will be updated with additional information in the coming days. Figure 2: Zoomed Preliminary Reports for the same period. Below are some guidelines for keeping safe during a flash flood: Go to high ground immediately. The white pixels represent 70dBz values at around the 20,000 foot level, which combined with values in excess of 50 dBZ at over 40,000 feet elevation are indicative of an intense updraft. Drizzle early. This is taken about 15 minutes after the cross-section in Figure 1, as the core of the storm was collapsing downward.
Minor flooding has also been recorded in southern Luzerne County. Flooding along Frankford Creek has been recorded back to at least the 1800s.
Figure 9: MRMS 12 hour radar estimated rainfall valid at 0200 UTC on 7 July 2020. National Oceanic and Atmospheric Administration Parts of Pennsylvania saw over 4 inches (101.6mm) of rain on 11 July, triggering flash floods and mudslides. Severe flash flooding resulted, with dozens of vehicles stranded in water and multiple creeks and streams flooding within an hour. At this time, the 1.3 degree angle was scanning about 5500 feet above the surface. Widespread flash flooding is occurring. Becoming mostly cloudy with an afternoon shower in spots; noticeably cooler. Deadly flash flooding hitting near Philadelphia will Reeve is there and Douglass township Pennsylvania with the latest good morning well. Weather warnings were issued along the East Coast on August 4 as Tropical Storm Isaias moved north, posing “a significant risk of life-threatening flash and urban flooding,” the National Hurricane Center said. Click here for a county warning area based plot of local storm reports and warnings/advisories issued for the 6 July 2020 event.
The updraft can be seen tilting to the east with height. Error!
Meanwhile, a weather spotter in northeastern Philadelphia near Rockledge also measured 4.9 inches of rainfall — more than the 4.35 inches Philadelphia averages during the entire month of July. Flash flooding possible in central Pa. as Tropical Storm Isaias moves up East Coast. Tacony Creek snakes through northern Philadelphia, becoming Frankford Creek before emptying into the Delaware River, and was reported “completely out of its banks,” according to the National Weather Service. Questions? The babbling brook transformed into a roaring river, with a peak flow rate near 8,000 cubic feet per second. Flash flood emergency in Philadelphia as storms dump half a foot of rain in two hours. SW values have also decreased, and the reflectivity is taking on a bowing segment pattern which indicates continued potential for straight line wind damage, but a lesser risk of a tornado. 0400 pm flash flood cheltenham 40.06n 75.11w 07/06/2020 montgomery pa county official severe flash flooding occurred in the cheltenham area westward to the audubon area in far southeast montgomery and adjacent northwest philadelphia counties.
By midday, MLCAPE values exceeded 3000 J/kg with minimal convective inhibition as strong insolation occurred during the morning hours. Sorry, the location you searched for was not found. At this time, the 0.8 degree angle was scanning only about 1700 feet above the surface. "I wouldn't want to put my car in the mud and I know it can be a pain just to get home, sometimes an act of kindness goes a long way," Brickson said. Elevated SW values are also present, indicative of turbulent flow which is usually found in tornadic circulations. Please select one of the following: Middle Atlantic River Forecast Center (MARFC), National Centers for Environmental Information (NCEI), National Oceanic and Atmospheric Administration, Figure 19: 12z Wallops Island, VA sounding, Figure 22: 00z Wallops Island, VA sounding, Figure 1: National Preliminary Reports 12z 6 July 2020 to 12z 7 July 2020. Doppler radar estimated that as much as 6.22 inches had fallen just south of Rockledge, a suburb about five miles northeast of downtown Philly, as of 3:45 p.m. A second rainfall maximum was located to the northwest near King of Prussia, where about four inches fell. Additional storms formed along the leading edge of that annular breeze, expanding outward ahead of the “cold pool” left in its wake. Synoptic Overview at 12z 6 July 2020 (courtesy of SPC), Synoptic Overview at 00z 7 July 2020 (courtesy of SPC).
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