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Longstown Warnings, Watches and Advisories

SAFETY and DATA MESSAGE

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Longstown.

Use the Radar Maps link provided to understand the trajectory of a storm.

Radar Maps

NWS Active Alerts for PA - Map View

State: PA Total alerts: 1 Updated: Aug 27, 2026 12:48am EDT

Flood Watch

Area
New Castle; Sussex; Morris; Hunterdon; Somerset; Middlesex; Western Monmouth; Mercer; Gloucester; Camden; Northwestern Burlington; Delaware; Philadelphia; Western Chester; Eastern Chester; Western Montgomery; Eastern Montgomery; Upper Bucks; Lower Bucks

Flood Watch issued August 26 at 2:31PM EDT until August 28 at 4:00AM EDT by NWS Mount Holly NJ

* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of northern Delaware, including the following area, New Castle, New Jersey, including the following areas, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset, Sussex and Western Monmouth, and southeast Pennsylvania, including the following areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester and Western Montgomery. * WHEN...From Thursday afternoon through late Thursday night. * IMPACTS...Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Showers and thunderstorms are expected to develop by mid-day Thursday. Some of these showers and thunderstorms are expected to produce very heavy rainfall. 1-2 inches of rain can be expected with localized amounts of 3-5 inches possible in the strongest storms. - http://www.weather.gov/safety/flood

Severity
Severe

Certainty
Possible

Urgency
Future

Published
August 26th, 2026 02:31:00 pm EDT

Effective
August 26th, 2026 02:31:00 pm EDT

Expires
August 27th, 2026 02:45:00 am EDT

For more official information about severe storms and how to stay safe, visit the National Weather Service's Severe Thunderstorm Safety page. We encourage you to also monitor Excessive Rainfall Forecasts on their Weather Prediction Center website.

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