
Severe Storms to Rattle the Northeastern U.S.
After a hazy conclusion to the workweek, scattered to numerous severe storms will impact the northeastern quadrant of the nation to start the weekend.
# HEADLINE -------------------- FLOOD WATCH REMAINS IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH LATE TONIGHT # DETAILS -------------------- WHAT Flash flooding caused by excessive rainfall continues to be possible. WHERE Portions of northern Delaware, including the following area, New Castle, New Jersey, including the following areas, Camden, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren and Western Monmouth, and Pennsylvania, including the following areas, Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester and Western Montgomery. WHEN From 10 AM EDT this morning through late tonight. 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 - Multiple rounds of heavy showers and thunderstorms are expected for Saturday into Saturday night. Storms will be capable of producing rainfall amounts of 2 to 3 inches within a period of just one to two hours leading to flash flooding. - http://www.weather.gov/safety/flood ISSUED AT Saturday, July 18, 2026 at 2:13 AM EDT ISSUED BY National Weather Service Mount Holly NJ HEADER Flood Watch # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. # AREAS AFFECTED -------------------- Eastern Montgomery, Northwestern Burlington, Philadelphia, Western Monmouth, Berks, Camden, Carbon, Coastal Ocean, Delaware, Eastern Chester, Eastern Monmouth, Gloucester, Hunterdon, Lehigh, Lower Bucks, Mercer, Middlesex, Monroe, Morris, New Castle, Northampton, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Upper Bucks, Warren, Western Chester, Western Montgomery Including the cities of Lansdale, Honey Brook, Long Beach Island, Morristown, Cherry Hill, Morrisville, Pennsville, Newton, Oxford, Norristown, Perkasie, Trenton, Pottstown, Glassboro, Somerville, Mount Holly, Sandy Hook, West Chester, New Brunswick, Kennett Square, Moorestown, Wharton State Forest, Collegeville, Doylestown, Camden, Washington, Flemington, Jim Thorpe, Easton, Jackson, Stroudsburg, Media, Philadelphia, Wilmington, Reading, Allentown, Chalfont, Freehold, and Bethlehem
# HEADLINE -------------------- AIR QUALITY ALERT IS IN EFFECT FOR SATURDAY JULY 18 # SUMMARY -------------------- The Delaware Department of Natural Resources and Environmental Control has issued a code orange air quality alert Saturday for New Castle County. A code orange air quality alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children...people suffering from asthma... heart disease or other lung diseases...and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles...visit http://www.dnrec.delaware.gov # DETAILS -------------------- ISSUED AT Friday, July 17, 2026 at 3:45 PM EDT ISSUED BY Relayed by National Weather Service Mount Holly NJ HEADER Air Quality Alert Message | MD Dept of Environment, DE Dept of Natural Resources and | Environmental Control, NJ Dept of Environmental Protection, PA | Dept of Environmental Protection and Delaware Valley Regional | Planning Commission # AREAS AFFECTED -------------------- New Castle
Closest strike: 22.11 miles Monitor Storms You are not at immediate risk, but frequently check WeatherBug to see if storms are moving towards you. Be aware that new storms can also form with little notice.
There is a Enhanced Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS THE LOWER GREAT LAKES AND MID-ATLANTIC THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS PORTIONS OF WESTERN TO CENTRAL MONTANA SUMMARY Severe thunderstorms are expected across portions of the Ohio Valley and Lower Great Lakes into the Mid-Atlantic and Northeast this afternoon and evening. Damaging gusts will be the primary threat, but a few tornadoes are possible, including perhaps a strong tornado. 20z Update The previous forecast remains on track with only minor adjustments required based on recent convective trends. Lingering clouds and stratiform precipitation across northern NY and into VT/NH continues to limit confidence in the degree of destabilization that will occur through the remainder of the day. Latest high-res ensemble guidance has captured recent trends and depicts limited potential for intense convection through this evening. Severe wind/hail probabilities have been reduced to reflect the decreasing potential. For additional short-term forecast details across the lower Great Lakes see MCD #1650. Further west, the 5/15% wind probabilities have been expanded slightly eastward to account for trends in recent guidance that depict some threat for severe winds across central MT later tonight as thunderstorms begin to cluster. Given building buoyancy, strong shear across the region (per recent mesoanalysis estimates), and building cumulus within the terrain, environmental trends appear to support the eastward expansion. See MCD #1651 for additional short-term details.












