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

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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

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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

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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

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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

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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

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A few severe thunderstorms are expected Monday afternoon and evening from South Dakota into northern Minnesota, and during the day from Pennsylvania into New York and Vermont. Isolated severe storms are expected from Wyoming into Nebraska, across the Appalachians, and across southern Arizona. Supercell formations are possible, given the weak capping convection and instability. This means that damaging storms are possible, as well as hail and gusty wind. Isolated tornadoes cannot be ruled out in the slight risk area. Stay up to date by following the Pennsylvania Weather Authority and the NWS for any alerts that may be issued.

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A few severe thunderstorms are expected Monday afternoon and evening from South Dakota into northern Minnesota, and during the day from Pennsylvania into New York and Vermont. Isolated severe storms are expected from Wyoming into Nebraska, across the Appalachians, and across southern Arizona. Supercell formations are possible, given the weak capping convection and instability. This means that damaging storms are possible, as well as hail and gusty wind. Isolated tornadoes cannot be ruled out in the slight risk area. Stay up to date by following the Pennsylvania Weather Authority and the NWS for any alerts that may be issued.

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A few severe thunderstorms are possible from the middle Mississippi Valley northeastward toward lake Erie, across the northern Rockies and High Plains, and over southern Arizona. Scattered weaker storms will occur during the afternoon across much of the Southeast. Severe thunderstorms are not likely to occur from Jul 16-17 across the state. Isolated storms will mainly be pop-ups and pose no threat for wind related damage. The severity remains below five percent as of right now. Storm activity along a cold front should increase throughout the day as heating commences, resulting in moderate instability from MO into southern Lower MI. A belt of 30-35 kt northerly mid-level low will exist across

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A few severe thunderstorms are possible from the middle Mississippi Valley northeastward toward lake Erie, across the northern Rockies and High Plains, and over southern Arizona. Scattered weaker storms will occur during the afternoon across much of the Southeast. Severe thunderstorms are not likely to occur from Jul 16-17 across the state. Isolated storms will mainly be pop-ups and pose no threat for wind related damage. The severity remains below five percent as of right now. Storm activity along a cold front should increase throughout the day as heating commences, resulting in moderate instability from MO into southern Lower MI. A belt of 30-35 kt northerly mid-level low will exist across

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Good news for those who aren’t fans of the heat! Waves of cooler air will continue to drop in from Canada and will keep prolonged heat waves at bay across the northeastern United States into August. What does this mean for the northeastern US? A southward dip in the jet stream is likely to be a semi-permanent feature over the Great Lakes and Northeast through at least the middle of the summer. That’s correct, lower electric bills may be on the horizon, as many will not need to use their air conditioners! There will still be some brief switches back to heat during the period, however, temperatures in parts of the northern tier

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Good news for those who aren’t fans of the heat! Waves of cooler air will continue to drop in from Canada and will keep prolonged heat waves at bay across the northeastern United States into August. What does this mean for the northeastern US? A southward dip in the jet stream is likely to be a semi-permanent feature over the Great Lakes and Northeast through at least the middle of the summer. That’s correct, lower electric bills may be on the horizon, as many will not need to use their air conditioners! There will still be some brief switches back to heat during the period, however, temperatures in parts of the northern tier

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As heavy rain made its way through parts of Pennsylvania early Friday morning, a flash flood warning was in effect until 8:45 am this morning. Heavy rain from these storms triggered flash flooding in Indiana County, leaving some residents without power, and flooded homes and roadways. The National Weather Service said emergency management officials reported multiple flooded roadways and several hundred flooded basements shortly after 5 a.m. Emergency officials told news sources, that they received 30 to 40 reports of flooded basements not only in Indiana Borough, but in White Township as well. Water levels reached four feet in some homes. Parts of Wayne Avenue down to Carter Street, looked like a pond,

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As heavy rain made its way through parts of Pennsylvania early Friday morning, a flash flood warning was in effect until 8:45 am this morning. Heavy rain from these storms triggered flash flooding in Indiana County, leaving some residents without power, and flooded homes and roadways. The National Weather Service said emergency management officials reported multiple flooded roadways and several hundred flooded basements shortly after 5 a.m. Emergency officials told news sources, that they received 30 to 40 reports of flooded basements not only in Indiana Borough, but in White Township as well. Water levels reached four feet in some homes. Parts of Wayne Avenue down to Carter Street, looked like a pond,

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Storms have evolved into a couple of extensive, southeastward-moving linear segments over the past couple of hours. These storms have a history of occasional damaging wind gusts and isolated large hail. A few supercellular structures have been noted recently especially in southern New Jersey as updrafts interact with a nearly stationary surface boundary across that region. An isolated tornado cannot be completely ruled out here (in addition to a few instances of large hail), although the primary threat should be damaging wind gusts into the evening as storms migrate into a moderately unstable pre-convective airmass. North of the linear structures, recent convective overturning has stabilized localized areas (especially in southeastern Pennsylvania)

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Storms have evolved into a couple of extensive, southeastward-moving linear segments over the past couple of hours. These storms have a history of occasional damaging wind gusts and isolated large hail. A few supercellular structures have been noted recently especially in southern New Jersey as updrafts interact with a nearly stationary surface boundary across that region. An isolated tornado cannot be completely ruled out here (in addition to a few instances of large hail), although the primary threat should be damaging wind gusts into the evening as storms migrate into a moderately unstable pre-convective airmass. North of the linear structures, recent convective overturning has stabilized localized areas (especially in southeastern Pennsylvania)

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*As issued by the SPC* Pennsylvania remains in a general isolated thunderstorm risk. Thunderstorms extending from the Ohio Valley to the central Plains will remain capable of producing isolated strong to damaging winds this evening. Multiple clusters of loosely organized thunderstorms are present this evening from the OH Valley to the central Plains both along and ahead of a surface cold front. 30-40 kt of westerly mid-level flow across the lower Great Lakes and Mid-Atlantic should remain generally displaced to the north/east of ongoing convection through the remainder of this evening and continuing into tonight. A moist and moderately unstable airmass present from the southern OH Valley into the MO Valley

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*As issued by the SPC* Pennsylvania remains in a general isolated thunderstorm risk. Thunderstorms extending from the Ohio Valley to the central Plains will remain capable of producing isolated strong to damaging winds this evening. Multiple clusters of loosely organized thunderstorms are present this evening from the OH Valley to the central Plains both along and ahead of a surface cold front. 30-40 kt of westerly mid-level flow across the lower Great Lakes and Mid-Atlantic should remain generally displaced to the north/east of ongoing convection through the remainder of this evening and continuing into tonight. A moist and moderately unstable airmass present from the southern OH Valley into the MO Valley

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As issued by the SPC, Isolated severe thunderstorms are forecast on Thursday from Illinois eastward across Indiana, Ohio, and into western Pennsylvania. As a mid-level speed maximum moves off the Atlantic coast of the northeast states, a weak frontal wave will move off the southern New England coast early in the period. A front will extend from the southern New England coast through the OH Valley and into the central High Plains. …Lower Great Lakes and Ohio Valley region to the mid-Atlantic and southern New England…Morning convection and associated clouds will probably exist across portions of this broad region. Related outflow from overnight storm activity will also serve as a focus

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As issued by the SPC, Isolated severe thunderstorms are forecast on Thursday from Illinois eastward across Indiana, Ohio, and into western Pennsylvania. As a mid-level speed maximum moves off the Atlantic coast of the northeast states, a weak frontal wave will move off the southern New England coast early in the period. A front will extend from the southern New England coast through the OH Valley and into the central High Plains. …Lower Great Lakes and Ohio Valley region to the mid-Atlantic and southern New England…Morning convection and associated clouds will probably exist across portions of this broad region. Related outflow from overnight storm activity will also serve as a focus

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