Union Township, Hunterdon County Office of Emergency Management

09/12/2026

09/12/2026

*Summary: Low pressure will lift north through the region late tonight through Sunday morning. Showers and thunderstorms associated with that low will be capable of producing excessive rainfall rates leading to possible flash flooding.

*Hazardous Weather: Heavy rain leading to flash flooding is possible. Rainfall rates around 2 inches per hour will be possible with any stronger showers or storms. The Slight Risk, or 2 out of 4, for flash flooding was expanded to include northern Delaware, all of southeast Pennsylvania, and most of New Jersey. The rest of the region is in a Marginal Risk, or 1 out of 4. The risk for severe thunderstorms is very low.

*Locations affected: The greatest risk is in the more flash flood prone urban areas near and along the I-95 corridor, particularly from Wilmington to Philadelphia to near Trenton.

*Timing: Mainly late night into early Sunday morning.

*Impacts: 1-2 inches of rain in a very short period of time can lead to flash flooding particularly in urban areas, potentially leading to localized road closures. Some smaller, faster responding creeks and streams could flood.

*Confidence on occurrence: Confidence on the axis of the heaviest rain being along the I-95 corridor has increased.

09/03/2026

The risk of severe weather this evening has somewhat increased. More info is attached.

09/03/2026

*A CLUSTER OF STRONG T-STORMS LOOKING MORE LIKELY TONIGHT *

THREAT TIME: THURSDAY 10:00 PM - FRIDAY 2:00 AM

In an unusual setup for NJ, especially in September, we will have a late evening/early overnight threat of severe weather tonight. Despite it being very warm & humid, we won't see much more than an isolated shower or storm this afternoon. If there is one, it could be locally strong, but coverage would be quite limited. The main concern will arrive late this evening as a complex of showers and storms moves out of PA into NJ. While the worst of the storms focus to our south, we are quite likely to see showers and storms for a few hours either side of midnight. Given an abnormally high amount of nighttime energy for storms to work with, damaging wind gusts and hail will be possible along with spotty poor drainage flooding. Thankfully, storms will end in the predawn, and a good part of Friday looks dry.

09/02/2026

Updated briefing attached. Location and frequency of severe weather for tonight continues to be highly uncertain.

09/02/2026

The risk of severe weather continues today - see attached for more information.

09/01/2026

The latest NWS weather briefing is attached.

09/01/2026

Today is an interesting scenario for severe weather and thunderstorms. Overall, the background conditions are supportive of storms becoming strong to severe, with gusty winds, hail and even a tornado all possible. Additionally, with lots of moisture in place, we'll have to contend with heavy downpours, and localized flooding, which probably has a slightly greater likelihood of occurrence compared to severe thunderstorms in any one spot. However, storm coverage (especially the stronger ones) is the limiting factor today, as these may prove to be isolated to scattered, as opposed to numerous. The time of greatest concern will be 3 - 7/8 PM, when coverage should be relatively greatest and there still will be enough availability of energy from the daytime. Unfortunately, this will coincide with the PM rush hour before things quiet down later in the evening.

09/01/2026

Severe storms with damaging winds and other hazards possible through much of the week. Today’s period of concern is mainly from mid-afternoon into the evening. More info attached.

08/31/2026

The U.S. Small Business Administration announced the availability of low-interest federal disaster loans for eligible small businesses and private nonprofit organizations impacted by drought beginning May12. More info attached and below.