Proceed with caution as you make your way home this evening, as the National Weather Service in Mount Holly has issued a flash flood watch in Southeastern Pennsylvania, South Jersey and Northern Delaware (full list of affected areas below) through late tonight.
“Variable rainfall overnight between one half and 2.5 inches in a large portion of the watch area along with flooding in Southeastern Pennsylvania and far Northwest New Jersey this morning has set the stage for the potential for new flooding,” says the NWS.
“The flash flood threat in Eastern Pennsylvania and far Northern Delaware is mostly this afternoon and evening while in New Jersey the primary risk for flash flooding is between 3 p.m. and midnight”
How to proceed? “Do not drive your vehicle into areas where the water covers the roadway. The water depth may be too great to allow your car to cross safely. Move to higher ground,” advised the NWS about an earlier flood advisory.
About the flash flood watch, it adds, “conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should flash flood warnings be issued.”
...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NEW JERSEY...CAMDEN... GLOUCESTER...HUNTERDON...MERCER...MIDDLESEX...MORRIS... NORTHWESTERN BURLINGTON...SALEM...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...CARBON...DELAWARE...EASTERN CHESTER...EASTERN MONTGOMERY...LEHIGH...LOWER BUCKS...MONROE... NORTHAMPTON...PHILADELPHIA...UPPER BUCKS...WESTERN CHESTER AND WESTERN MONTGOMERY. * THROUGH LATE TONIGHT * VARIABLE RAINFALL OVERNIGHT BETWEEN ONE HALF AND AND 2.5 INCHES IN A LARGE PORTION OF THE WATCH AREA ALONG WITH FLOODING IN SOUTHEASTERN PENNSYLVANIA AND FAR NORTHWEST NEW JERSEY THIS MORNING HAS SET THE STAGE FOR THE POTENTIAL FOR NEW FLOODING. * VERY FAST RESPONSE IS EXPECTED TO THE UPCOMING HEAVY SHOWERS AND SCATTERED THUNDERSTORMS. * THE FLASH FLOOD THREAT IN EASTERN PENNSYLVANIA AND FAR NORTHERN DELAWARE IS MOSTLY THIS AFTERNOON AND EVENING WHILE IN NEW JERSEY THE PRIMARY RISK FOR FLASH FLOODING IS BETWEEN 3 PM AND MIDNIGHT. * RESIDUAL RUNOFF MAY FORCE ANY FLOODING TO LINGER WELL PAST MIDNIGHT. * NEW STORM TOTAL RAINFALL THIS AFTERNOON AND EVENING MAY REACH 2.5 INCHES. IN MANY AREAS...IT WILL TAKE ONLY AN INCH OF RAIN 45 MINUTES TO AN HOUR TO PRODUCE FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.