Three days of stormy weather is expected to hit Eastern Pennsylvania beginning Thursday night and going through Saturday. Gusty thunderstorms and drenching downpours are expected on Friday and Saturday, according to forecasters. The National Weather Service has issued a hazardous weather outlook for the region, saying showers and thunderstorms may produce locally heavy rainfall Thursday night. There is also the potential for heavy rainfall Friday afternoon through Saturday morning. The rainstorm is unusual because it will come with steady rain for 12 hours or more in many locations. Typically in the summer, rainfall is limited to a few hours unless there’s a tropical storm. Tonight: A chance of showers and thunderstorms, mainly

Advertisements
close

Three days of stormy weather is expected to hit Eastern Pennsylvania beginning Thursday night and going through Saturday. Gusty thunderstorms and drenching downpours are expected on Friday and Saturday, according to forecasters. The National Weather Service has issued a hazardous weather outlook for the region, saying showers and thunderstorms may produce locally heavy rainfall Thursday night. There is also the potential for heavy rainfall Friday afternoon through Saturday morning. The rainstorm is unusual because it will come with steady rain for 12 hours or more in many locations. Typically in the summer, rainfall is limited to a few hours unless there’s a tropical storm. Tonight: A chance of showers and thunderstorms, mainly

Advertisements
Read more

Posted in Forecasts

Scattered thunderstorms will develop across a large portion of the US Thursday. A few storms may produce gusty winds across the central/northern High Plains and from Oklahoma to southern New England. High-PW plume will be gradually shunted southeast across the contiguous US during the day2 period as a frontal zone progresses to a position from Lake ON, southwest across IN into northern OK by 18z. This high PW plume will be characterized by poor lapse rates with embedded left over convective MCVs. Each of these features will be difficult to predict with any certainty beyond a few hours and 12z model guidance is not particularly useful identifying any notable feature that

close

Scattered thunderstorms will develop across a large portion of the US Thursday. A few storms may produce gusty winds across the central/northern High Plains and from Oklahoma to southern New England. High-PW plume will be gradually shunted southeast across the contiguous US during the day2 period as a frontal zone progresses to a position from Lake ON, southwest across IN into northern OK by 18z. This high PW plume will be characterized by poor lapse rates with embedded left over convective MCVs. Each of these features will be difficult to predict with any certainty beyond a few hours and 12z model guidance is not particularly useful identifying any notable feature that

Read more

Posted in Forecasts

Flooding will continue through the night and into the morning hours Monday as additional rounds of showers and thunderstorms move into southeastern Pennsylvania.  Some areas will see upwards of 6 inches of rainfall. Additionally, rounds of heavy rain and thunderstorms will move from Pittsburgh to Scranton into the early morning hours Monday. This corridor will receive 1-3 inches of rain overnight, with some areas seeing up to 5 inches of rain. Flooding will be likely across this area into tomorrow morning. According to local media, Woodlayne Court Apartments in Middletown, Pennsylvania, are being evacuated as about five feet of water have flooded into the basement. First responders are on the scene to

close

Flooding will continue through the night and into the morning hours Monday as additional rounds of showers and thunderstorms move into southeastern Pennsylvania.  Some areas will see upwards of 6 inches of rainfall. Additionally, rounds of heavy rain and thunderstorms will move from Pittsburgh to Scranton into the early morning hours Monday. This corridor will receive 1-3 inches of rain overnight, with some areas seeing up to 5 inches of rain. Flooding will be likely across this area into tomorrow morning. According to local media, Woodlayne Court Apartments in Middletown, Pennsylvania, are being evacuated as about five feet of water have flooded into the basement. First responders are on the scene to

Read more

Posted in Forecasts

Scattered thunderstorms are expected to develop across this region in patchwork fashion, along and ahead of the surface cold front today into this evening. Activity will offer mainly damaging wind, with isolated severe hail also possible. The risk area remains rather broad-brushed and generalized at this time due to the messy, nuanced character and mesoscale dependence of potential convective foci. (blue area shows a 40% chance of thunderstorms for today) On Monday, Isolated strong/severe storms may occur over portions of the northern Plains vicinity, as well as across parts of the central Appalachians and mid Atlantic region. Strong storms may be ongoing at the start of the period across portions of the southern

close

Scattered thunderstorms are expected to develop across this region in patchwork fashion, along and ahead of the surface cold front today into this evening. Activity will offer mainly damaging wind, with isolated severe hail also possible. The risk area remains rather broad-brushed and generalized at this time due to the messy, nuanced character and mesoscale dependence of potential convective foci. (blue area shows a 40% chance of thunderstorms for today) On Monday, Isolated strong/severe storms may occur over portions of the northern Plains vicinity, as well as across parts of the central Appalachians and mid Atlantic region. Strong storms may be ongoing at the start of the period across portions of the southern

Read more

Posted in Forecasts

The pattern responsible for sparse severe thunderstorm activity and heavy rainfall the past few days will energize and increase the risk to lives and property across the northeastern United States this weekend. Those sweltering in recent days from blazing sunshine, heat and high humidity will get relief but at a price. Motorists and those spending time outdoors should be on the lookout for rapidly changing weather conditions. Airline passengers are likely to face delays as storms approach their departure, arrival or connection hubs. A couple of storm systems will roll eastward from the Midwest this weekend. These storms will tap the high level of moisture in the region as well as

close

The pattern responsible for sparse severe thunderstorm activity and heavy rainfall the past few days will energize and increase the risk to lives and property across the northeastern United States this weekend. Those sweltering in recent days from blazing sunshine, heat and high humidity will get relief but at a price. Motorists and those spending time outdoors should be on the lookout for rapidly changing weather conditions. Airline passengers are likely to face delays as storms approach their departure, arrival or connection hubs. A couple of storm systems will roll eastward from the Midwest this weekend. These storms will tap the high level of moisture in the region as well as

Read more

Posted in Forecasts

July 20, 2017: High winds in western New York that lifted cars, threw outdoor tables onto roofs and ripped the siding off houses were confirmed to be the work of at least two tornadoes, according to the National Weather Service. Weather officials believe one tornado struck Hamburg around 12:30 p.m. Thursday, while the other hit Holland about 20 minutes later. A large thunderstorm moved onshore from Lake Erie, forming a tornado as it moved across Erie County, leaving a trail of damage in its wake, according to the weather service. Hundreds of cars reportedly had their windows blown out as the newly formed, 700-yard wide tornado traveled 5 miles from Hamburg,

close

July 20, 2017: High winds in western New York that lifted cars, threw outdoor tables onto roofs and ripped the siding off houses were confirmed to be the work of at least two tornadoes, according to the National Weather Service. Weather officials believe one tornado struck Hamburg around 12:30 p.m. Thursday, while the other hit Holland about 20 minutes later. A large thunderstorm moved onshore from Lake Erie, forming a tornado as it moved across Erie County, leaving a trail of damage in its wake, according to the weather service. Hundreds of cars reportedly had their windows blown out as the newly formed, 700-yard wide tornado traveled 5 miles from Hamburg,

Read more

A few areas of showers and thunderstorms will likely be ongoing within zone of warm advection and isentropic ascent north of the warm front from parts of the Dakotas into the upper MS and OH Valley regions. This activity will be elevated above a stable surface layer, but could pose at least a marginal risk for hail as it shifts eastward. The moist warm sector in vicinity of the warm front will destabilize during the day with moderate to strong instability possible during the afternoon. A capping inversion associated with eastern extension of the elevated mixed layer may limit more robust initiation over western portion of region until mid-late afternoon when

close

A few areas of showers and thunderstorms will likely be ongoing within zone of warm advection and isentropic ascent north of the warm front from parts of the Dakotas into the upper MS and OH Valley regions. This activity will be elevated above a stable surface layer, but could pose at least a marginal risk for hail as it shifts eastward. The moist warm sector in vicinity of the warm front will destabilize during the day with moderate to strong instability possible during the afternoon. A capping inversion associated with eastern extension of the elevated mixed layer may limit more robust initiation over western portion of region until mid-late afternoon when

Read more

Posted in Forecasts

A few severe storms with wind or hail are possible across the northern High Plains, and from parts of the Midwest into the Northeast this afternoon. An upper high will be centered over the mid MS into the OH Valley with belt of stronger 40-50 kit midlevel flow across the northern tier of states. The strongest flow will exist from the Great Lakes into the Northeast, with a progressive embedded shortwave trough. To the west, another shortwave will move from across the northern Rockies late in the period, with a slight flattening of the upper ridge into the northern High Plains. Early storms are expected across Lower Michigan and vicinity this

close

A few severe storms with wind or hail are possible across the northern High Plains, and from parts of the Midwest into the Northeast this afternoon. An upper high will be centered over the mid MS into the OH Valley with belt of stronger 40-50 kit midlevel flow across the northern tier of states. The strongest flow will exist from the Great Lakes into the Northeast, with a progressive embedded shortwave trough. To the west, another shortwave will move from across the northern Rockies late in the period, with a slight flattening of the upper ridge into the northern High Plains. Early storms are expected across Lower Michigan and vicinity this

Read more

Posted in Forecasts

A batch or train of thunderstorms was responsible for the Johnstown, Pennsylvania, flood of July 19-20, 1977. Close to a foot of rain fell in 24 hours over the mountains north of the city. A series of dams failed with sent a wall of water into the city. Dozens were killed and damage topped $100 million. A similar setup mostly likely was the cause of the Smethport, Pennsylvania, record rainfall and flood of July 17, 1942. In just 12 hours, 34.30 inches of rain fell. The torrential rain caused catastrophic mudslides and flooding that took the lives of more than a dozen people. Rounds of thunderstorms with torrential rain and gusty winds will

close

A batch or train of thunderstorms was responsible for the Johnstown, Pennsylvania, flood of July 19-20, 1977. Close to a foot of rain fell in 24 hours over the mountains north of the city. A series of dams failed with sent a wall of water into the city. Dozens were killed and damage topped $100 million. A similar setup mostly likely was the cause of the Smethport, Pennsylvania, record rainfall and flood of July 17, 1942. In just 12 hours, 34.30 inches of rain fell. The torrential rain caused catastrophic mudslides and flooding that took the lives of more than a dozen people. Rounds of thunderstorms with torrential rain and gusty winds will

Read more

Posted in Forecasts

Synoptic upper pattern will change little Tuesday with belt of stronger winds over the northern tier of states. Embedded within this regime, a low-amplitude shortwave trough now moving into the northern High Plains will continue east into the upper MS Valley and Great Lakes. In wake of this feature heights will rise over the northern High Plains during the day. However, a secondary impulse is forecast to reach central and eastern MT later Tuesday night. At the surface a cold front will continue southeast through WI and MN with trailing portion of this boundary likely to become quasi-stationary across NE. A general risk is in place for parts of central and

close

Synoptic upper pattern will change little Tuesday with belt of stronger winds over the northern tier of states. Embedded within this regime, a low-amplitude shortwave trough now moving into the northern High Plains will continue east into the upper MS Valley and Great Lakes. In wake of this feature heights will rise over the northern High Plains during the day. However, a secondary impulse is forecast to reach central and eastern MT later Tuesday night. At the surface a cold front will continue southeast through WI and MN with trailing portion of this boundary likely to become quasi-stationary across NE. A general risk is in place for parts of central and

Read more

Posted in Forecasts