Increased Storm Chance Overnight, Severe Weather Possible Monday

Viktoria Ivanova

4 min read

Post on May 21, 2025

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Overnight Storm Predictions

Timing and Location

The National Weather Service predicts a heightened risk of severe weather from 10 PM Sunday to 6 AM Monday, primarily impacting the counties of Allegheny, Westmoreland, and Fayette in Pennsylvania. Areas along the Ohio River are expected to experience the most intense impacts. This period will see the initial wave of the storm system move through.

• Expected storm intensity: Strong winds gusting up to 40 mph are likely, accompanied by heavy rainfall. There is a low, but present, risk of isolated tornadoes.
• Predicted accumulation of rainfall: Rainfall totals of 1-2 inches are expected, with locally higher amounts possible in areas experiencing thunderstorms. This increases the risk of flash flooding.
• Potential for flash flooding: Low-lying areas and areas with poor drainage are at increased risk of flash flooding due to the heavy rainfall. Be prepared to move to higher ground if necessary.
• Probability percentages: The probability of severe thunderstorms is currently estimated at 60% for the affected region during the overnight hours.

Monday's Severe Weather Outlook

Potential Hazards

Monday will bring a continued risk of severe weather, though the intensity is expected to decrease compared to overnight. However, significant hazards remain.

• Risk of damaging winds: Damaging winds with gusts potentially reaching 50 mph are possible, particularly during any lingering thunderstorms. This could cause damage to trees and power lines.
• Likelihood of hail: There's a moderate risk of hail, with hail stones up to the size of quarters possible in stronger thunderstorms.
• Tornado risk: While the overnight tornado risk is low, a slight risk persists into Monday morning, particularly in the areas that experienced the heaviest rainfall and strongest storms overnight. Stay vigilant and monitor weather alerts.
• Potential for widespread power outages: Due to the high winds and potential for heavy rainfall, widespread power outages are a significant possibility.

Preparing for Severe Weather

Safety Precautions

Taking proactive steps to prepare for severe weather is crucial to minimizing risk. Here’s what you should do:

• Charge all electronic devices: Ensure your cell phones, tablets, and other devices are fully charged to stay connected during and after the storm.
• Gather emergency supplies: Stock up on bottled water, non-perishable food, a first-aid kit, flashlights, batteries, and a battery-powered radio.
• Secure loose objects outdoors: Bring any loose outdoor furniture, trash cans, and other items inside to prevent them from becoming airborne and causing damage or injury.
• Know your evacuation route: If you live in a flood-prone area or an area at high risk for tornadoes, plan your evacuation route in advance and know where you will go.
• Stay informed about weather updates: Monitor local news channels, weather radio, and the National Weather Service website for the latest updates and warnings.
• Understand the difference between a watch and warning: A watch means conditions are favorable for severe weather; a warning means severe weather is imminent or occurring. Take action when a warning is issued.

Impacts of Severe Weather

Potential Disruptions

The predicted severe weather could lead to several significant disruptions:

• Flight cancellations and travel delays: Expect potential delays or cancellations for flights in and out of affected airports.
• School closures: Schools may close due to safety concerns. Monitor school announcements for updates.
• Power outages and disruptions to essential services: Widespread power outages are likely, impacting essential services like water and communication.
• Road closures and traffic disruptions: Roads may be closed due to flooding, downed power lines, or debris. Avoid unnecessary travel during the storm.
• Damage to property and infrastructure: High winds, hail, and flooding can cause significant damage to homes, businesses, and infrastructure.

Conclusion

The increased chance of severe weather overnight and continuing into Monday requires careful preparation. The potential for strong winds, heavy rainfall, and even tornadoes necessitates immediate action. Remember the key predictions: high winds, heavy rainfall, and a potential for isolated tornadoes and hail overnight and into Monday, leading to potential power outages, flooding, and travel disruptions.

Stay informed about the developing severe weather situation by monitoring local news and weather reports. Prepare your home and family for potential severe weather impacts and remain vigilant for updates. Take the necessary precautions to ensure your safety during this period of increased severe weather risk. Don't delay – prepare now!