The NWS Office in Gray, ME has placed southern and central portions of the State of New Hampshire in a Heat Advisory for Friday of this week. Temperatures will continue hot and humid through the weekend and early next week During this period, the Rye Public Library will serve as a designated heat shelter if needed.
The State of New Hampshire has also been placed in a Marginal Severe Thunderstorm risk for Friday of this week. Here are details for weather hazards through Monday:
* Heat and humidity will continue today with high temperatures forecast to reach the low-mid 90’s across the state. Dew point temperatures will remain in the 70’s which will allow for oppressively hot conditions. Heat index values in the southern parts of the state are projected to reach the low 100’s as afternoon approaches. A Heat Advisory remains in effect until 7pm Friday evening.
* Temperatures will cool slightly for Saturday (thanks in part to cloud cover) with the high forecasted to reach the low-mid 80’s across the state. The humidity will linger through the weekend and will decrease as the new work week starts.
o High temperatures for Sunday are forecast to be in the mid-upper 80’s.
* There is a chance of showers and thunderstorms Friday, becoming more likely after 1pm and extending into the evening hours. There is an abundance of moisture available in this weather system that will allow for locally torrential rainfall to occur within strong thunderstorm cells. Additional hazards associated with these storms include gusty winds and small hail. Heavy rainfall within training storms is likely to produce isolated incidents of localized flash flooding. There is potential for isolated severe storms. 1/4 – 1/2 inch of rain possible through Friday night, with locally higher amounts in strong storms.
* There is potential for a Flash Flood Watch to be issued Saturday and Sunday as additional rounds of showers and thunderstorms are forecasted to continue through the weekend, wrapping up during the day on Monday. Generally, an additional 1-3 inches of new precipitation is being forecast by the models to occur over a 48 hour period (Saturday-Sunday).
For the latest forecasts and discussions, especially timing and forecast confidence, you can contact Gray National Weather Service at:
“Emergency Managers Self Briefing” http://www.weather.gov/gyx/EMhome