Severe weather threatens Plains to Midwest over Memorial Day weekend

first_imgABC News(NEW YORK) — The storm system that brought the tornado outbreak from the Plains to Mid-Atlantic spawned 104 reported tornadoes across eight states from Texas to Maryland is long gone, but the holiday weekend will not be a quiet one.A new storm system that began in the Plains on Thursday has brought 24 reported tornadoes in the last 48 hours across eight states: Texas, Oklahoma, Kansas, Missouri, Iowa, Illinois, Minnesota and North Dakota.These storms are also bringing very heavy rain to places that are already very saturated. Parts of Kansas received up to 4 inches of rain on Friday.Flash flood watches are in effect in parts of six states Saturday from Texas to Wisconsin. Flood warnings remain in effect in parts of Oklahoma and Kansas, where they have been dealing with relentless rain.With the continued threat of heavy rain over the next several days, many rivers are in major flood stage and rising along the Mississippi, Missouri and Arkansas rivers.A stationary front draped across the central U.S. will continue to bring the threat for severe storms in the Southern and Central Plains, across the Texas Panhandle, western Oklahoma and much of Kansas on Saturday.In the enhanced risk region the biggest threat will be large hail, but isolated tornadoes and damaging winds are expected. Flash flooding also remains a major concern, especially in Oklahoma and Kansas.A second severe weather concern exists across parts of the Ohio Valley and Great Lakes, including Pittsburgh, Cleveland and Buffalo, New York. The main threat Saturday afternoon will be damaging winds, but hail or a brief tornado can’t be ruled out.The same regions are under a severe threat on Sunday – across the Plains from Texas to South Dakota and a smaller area in the Ohio Valley, from Indianapolis to Columbus, Ohio.The stalled system will continue to bring rounds of severe storms and heavy rain across the Plains on Sunday, with the enhanced risk region in the Texas and Oklahoma panhandles, western Kansas and southern Nebraska.Heat is on in SoutheastIn the Southeast, scorching hot temperatures are on the way over the holiday weekend and into next week, with some spots hitting triple digits.The heat index numbers for Sunday are in the high 90s across much of the region. Record highs are possible in this area over the next several days.Copyright © 2019, ABC Radio. All rights reserved.last_img read more

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A statistical study of polar mesosphere summer echoes observed by EISCAT

first_imgA comprehensive survey of data on ‘Polar Mesosphere Summer Echoes’, observed by the EISCAT VHF radar during 1988–1993, confirms that (1) these echoes are a summer phenomenon, with a season lasting from June to August; (2) PMSE occur most frequently around noon and midnight, and thus follow a semidiurnal pattern; (3) PMSE occur at a mean height of 85±2 km; (4) there is often a good correlation between the vertical Doppler velocity and the rate of change of echo height, which suggests that the echoing structures move bodily, perhaps in response to gravity waves. Previous results on the lack of correlation between the occurrence of PMSE and noctilucent clouds are reinforced.last_img

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