Category: Forecasts

While Monday’s rain will be accompanied by an increase in humidity in the southern mid-Atlantic, the concern for thunderstorms to produce isolated damaging winds should mainly be confined to the South. As Monday’s rain departs, residents will want to take full advantage of the milder and drier Tuesday that will unfold. More rain spreading into the mid-Atlantic on Tuesday will indicate that the dry spell will not last long. At the same time, another band of rain and thunderstorms will rotate into the Ohio Valley and Great Lakes at midweek before slowing swinging through the rest of the Northeast Thursday into Friday. Once again, residents will be facing disruptions to travel

*Tree pollen map* As rain passes through parts of the state, pollen counts remain in the moderate to high range. Tree pollen remains moderate to high across most of the state today. *Grass pollen map* Those who suffer from grass pollen allergies may be feeling some relief as pollen counts have dropped across most of the state. Levels will fluctuate throughout the week as scattered showers will be possible for most of the week. Those who suffer from ragweed allergies are in luck! Ragweed counts remain at a zero across the state. Relief from tree pollen will be felt towards midweek, along with grass pollen. *Ragweed pollen map*

A line of shallow convection is along an eastward moving cold front from southern lower Michigan southward into extreme northwest Ohio and eastern Indiana. Nevertheless, model guidance suggests potential for a few thunderstorms to develop along the eastward moving line as it crosses Ohio this afternoon and evening. Mid-level southwest winds will provide sufficient vertical shear for a few strong storms to develop with potential for locally strong wind gusts to occur. A small portion of the state has been placed in a marginal risk whereas, the western and part of the central areas of the state have been placed in a thunderstorm risk. Storms may be severe in some areas

Strong storms will continue to rumble through Saturday. Cooler temperatures will make their way across the East coast this weekend. With the severe weather possibility, be sure to stay weather ready. Here is a look at the updated maps for Saturday, May 20, 2017. Cooler temps will cross the east coast and mid-Atlantic in some parts. That not only means cooler, more comfortable temps, but the chance of storms. Most of Pennsylvania remains in a thunderstorm risk, while the southwestern tip of the state has been placed in a marginal risk. *all maps are the property of TWC, Accuweather and the NWS*      

A line of isolated thunderstorms approaching the state from the west and south, will make their way across parts of the state this evening into tonight. Expect damaging winds, hail, and heavy rain in some areas. Report any damage to the NWS Pittsburgh and State College. Radar image from the NWS shows severe storms moving across the west into Pennsylvania. Stay alert with weather radio’s and apps for any warnings that may be issued.  

The allergy forecast for today remains high for both tree and grass pollen, across the state. Temperatures remain in the low eighties through the low nineties in some areas of the state. There is no precipitation in the forecast currently for today. Maps are below in order: Tree and grass pollen forecast across the state. Levels will remain on the higher side as the dry climate and wind are present. Temperature map valid today (5 pm), May 19, 2017. 12 hour precipitation probability map which is valid for Saturday, May 20, 2017. Updated maps will be shared if there are any changes. It will be relatively calm until the weekend.  

SEVERE THUNDERSTORM WATCH 237 IS IN EFFECT UNTIL 1100 PM EDT FOR THE FOLLOWING LOCATIONS IN PENNSYLVANIA COUNTIES INCLUDED ARE:  BRADFORD            CAMERON ELK MCKEAN POTTER SUSQUEHANNA TIOGA WARREN. Areas in a thunderstorm watch are highlighted in red.

A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR EASTERN FOREST COUNTY… At 520 PM EDT, a severe thunderstorm was located near Marienville, moving northeast at 45 mph. HAZARD…60 mph wind gusts and quarter-size hail. SOURCE…Radar. IMPACT…Minor hail damage to vehicles is possible. Expect wind damage to trees and power lines, resulting in some power outages. Locations impacted include… Marienville… PRECAUTIONARY/PREPAREDNESS ACTIONS… Move to an interior room on the lowest floor of a building. Please report severe weather by calling 412-262-1988.   Severe Thunderstorm Warning for… Northeastern Columbiana County in east central Ohio… Northern Beaver County in western Pennsylvania… Lawrence County in western Pennsylvania… Western Butler County in

Temperatures will reach the mid eighties today which is not to be as hot as yesterday, across most of the state. With warmer temperatures, pollen indexes rise. Here is a look at your temperature and pollen forecast for today. Temperatures will remain in the mid eighties throughout much of the day as storms make their way through later this afternoon and evening. Temperatures will drop late tonight and into Friday. Tree pollen is on the rise across much of the state and will remain on the higher side today and drop slightly for tomorrow. Allergens usually increase right before rain and storms move through, which may cause some respiratory problems for

The NWS SPC outlook has not changed much for Day 1, but, we have ‘FutureCast’ which will indicate where the sporadic cells will start to “fire”, and which way these cells will begin to take shape. We expect strong, moderate-lived storms that will fire in Eastern Ohio, and continue to fire in Beaver, Lawrence, and Mercer counties. Check back with the Pennsylvania Weather Authority for more information. Follow us on Facebook, and we are on Twitter @PAWXAuthority. 2:00PM – Storms will begin to develop in South East and Eastern Ohio. 5:00PM – Moisture levels in crease and storms will start to fire in Mercer, Lawrence, Butler Counties 6:00PM – The 5PM storms