Yes, these are heavy downpours going on now, as we've had 2-3" of rain in much of CNJ from about New Hope to Woodbridge and areas within 5-10 miles of that line, necessitating a flash flood warning (below) for this area until 9:30 pm. I was just out driving in it on 27 in Edison/Metuchen and some parts of the road are close to impassable. Could be significant urban flooding in some towns and on some roads.
https://www.weather.gov/phi/
Flash Flood Warning
National Weather Service Mount Holly NJ
518 PM EDT Sat Jul 15 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Mercer County in central New Jersey...
Central Middlesex County in northern New Jersey...
Southern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
East Central Bucks County in southeastern Pennsylvania...
* Until 930 PM EDT.
* At 518 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 3 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Trenton, New Brunswick, Somerset, Edison, East Brunswick, South
Brunswick, Sayreville, North Brunswick, Ewing, Princeton,
Pennington, and New Hope.
This includes the following highways...
New Jersey Turnpike between exits 10 and 12.
Interstate 295 in New Jersey between mile markers 70 and 76.
Interstate 287 in New Jersey between mile markers 0 and 4.
Garden State Parkway between mile markers 124 and 132.
And there's a flood watch posted for the entire Philly-NJ-NYC region for Sunday, as the NWS is calling for 1-2" of rain from late Saturday night through Sunday evening (with 3-5" possible in areas that get localized downpours that "train"), which could lead to widespread urban and stream flooding (given how wet it has been, especially along/NW of 95), but here's the thing about the type of storms we're likely to see. We're not going to see a steady moderate rain all day (like one gets with a classic coastal storm, for example) that puts down 1-2" of rain. Our situation is a deep, deep plume of tropical moisture being present (fuel) and an approaching "cold" front (the spark) focusing development of mesoscale convective showers and storms, wherein it will be quite possible to see a few 30-60 minute showers with heavy downpours that put down 1-2" of rain, while the rest of the time is just cloudy.
Flood Watch
National Weather Service Mount Holly NJ
324 PM EDT Sat Jul 15 2023
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible. From Midnight EDT tonight through Sunday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Creeks and streams may rise out of their banks. Flooding may occur
in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- High atmospheric moisture content combined with an
approaching front late tonight through Sunday will result in
numerous showers and thunderstorms capable of heavy rainfall.
Widespread rainfall amounts of 1 to 2 inches are forecast,
with localized amounts of 3 to 5 inches possible in some
areas where thunderstorms are more persistent. These totals
may result in flash flooding, particularly in flood-prone
urban and low-lying areas. Additionally, there will be some
potential for main stem river flooding following the heavy
rain, due to excessive runoff. The greatest threat will be in
areas that have recently had heavy rain and flooding, were
soils are already saturated, in portions of eastern
Pennsylvania and northwest New Jersey.
https://www.weather.gov/phi/
Flash Flood Warning
National Weather Service Mount Holly NJ
518 PM EDT Sat Jul 15 2023
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Mercer County in central New Jersey...
Central Middlesex County in northern New Jersey...
Southern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
East Central Bucks County in southeastern Pennsylvania...
* Until 930 PM EDT.
* At 518 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 3 inches of rain have fallen. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Trenton, New Brunswick, Somerset, Edison, East Brunswick, South
Brunswick, Sayreville, North Brunswick, Ewing, Princeton,
Pennington, and New Hope.
This includes the following highways...
New Jersey Turnpike between exits 10 and 12.
Interstate 295 in New Jersey between mile markers 70 and 76.
Interstate 287 in New Jersey between mile markers 0 and 4.
Garden State Parkway between mile markers 124 and 132.
And there's a flood watch posted for the entire Philly-NJ-NYC region for Sunday, as the NWS is calling for 1-2" of rain from late Saturday night through Sunday evening (with 3-5" possible in areas that get localized downpours that "train"), which could lead to widespread urban and stream flooding (given how wet it has been, especially along/NW of 95), but here's the thing about the type of storms we're likely to see. We're not going to see a steady moderate rain all day (like one gets with a classic coastal storm, for example) that puts down 1-2" of rain. Our situation is a deep, deep plume of tropical moisture being present (fuel) and an approaching "cold" front (the spark) focusing development of mesoscale convective showers and storms, wherein it will be quite possible to see a few 30-60 minute showers with heavy downpours that put down 1-2" of rain, while the rest of the time is just cloudy.
Flood Watch
National Weather Service Mount Holly NJ
324 PM EDT Sat Jul 15 2023
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible. From Midnight EDT tonight through Sunday evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Creeks and streams may rise out of their banks. Flooding may occur
in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- High atmospheric moisture content combined with an
approaching front late tonight through Sunday will result in
numerous showers and thunderstorms capable of heavy rainfall.
Widespread rainfall amounts of 1 to 2 inches are forecast,
with localized amounts of 3 to 5 inches possible in some
areas where thunderstorms are more persistent. These totals
may result in flash flooding, particularly in flood-prone
urban and low-lying areas. Additionally, there will be some
potential for main stem river flooding following the heavy
rain, due to excessive runoff. The greatest threat will be in
areas that have recently had heavy rain and flooding, were
soils are already saturated, in portions of eastern
Pennsylvania and northwest New Jersey.
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