Weather service issues flood watch due to Allegheny River ice jams
Warmer weather and an anticipated significant rainfall have resulted in the National Weather Service issuing a flood watch for the Allegheny River through Tuesday.
The flood watch extends from the Allegheny Lock and Dam No. 3 at Harmar north to the Clarion County line.
The watch means that residents along the river should keep an eye on the water level and be prepared to take quick action if it rises.
The watch notice states there are three ice jams in that section of river — including the one at Arnold — but all are currently stable.
The ice jam in Arnold is between 3 and 4 feet thick and a quarter-mile long, according to Dan Jones, spokesman for the Army Corps of Engineers Pittsburgh District.
Weather for the weekend calls for temperatures rising upward of 50 degrees and remaining above freezing overnight. Rainfall Saturday could be as much as three-quarters of an inch.
The weather service said the runoff could cause the jams — the others are at Brady's Bend and Parker, both in northern Armstrong County — to move and result in sudden flooding.
The Allegheny River at Arnold isn't a place where ice jams usually occur — unlike Brady's Bend.
Typically, jams form in the bends of a river because the current is slower, according to Tom Green, a meteorologist with the National Weather Service.
He's not sure why the ice formed on the river in Arnold but he noted that the drastic change in temperature might have been a major factor.
Green said the New Ken-sington/Arnold area experienced a severe drop in temperature — about 60 degrees — in a 24-hour period, from about 50 degrees early morning Monday to a low of about minus 9 by early Tuesday.
“It's not that the low temperatures are unheard of here,” Green said. “But to make that ice formation, the quick drop in temperatures and subzero weather both contributed.”
Show commenting policy
TribLive commenting policy
You are solely responsible for your comments and by using TribLive.com you agree to our Terms of Service.
We moderate comments. Our goal is to provide substantive commentary for a general readership. By screening submissions, we provide a space where readers can share intelligent and informed commentary that enhances the quality of our news and information.
While most comments will be posted if they are on-topic and not abusive, moderating decisions are subjective. We will make them as carefully and consistently as we can. Because of the volume of reader comments, we cannot review individual moderation decisions with readers.
We value thoughtful comments representing a range of views that make their point quickly and politely. We make an effort to protect discussions from repeated comments either by the same reader or different readers.
We follow the same standards for taste as the daily newspaper. A few things we won't tolerate: personal attacks, obscenity, vulgarity, profanity (including expletives and letters followed by dashes), commercial promotion, impersonations, incoherence, proselytizing and SHOUTING. Don't include URLs to Web sites.
We do not edit comments. They are either approved or deleted. We reserve the right to edit a comment that is quoted or excerpted in an article. In this case, we may fix spelling and punctuation.
We welcome strong opinions and criticism of our work, but we don't want comments to become bogged down with discussions of our policies and we will moderate accordingly.
We appreciate it when readers and people quoted in articles or blog posts point out errors of fact or emphasis and will investigate all assertions. But these suggestions should be sent via e-mail. To avoid distracting other readers, we won't publish comments that suggest a correction. Instead, corrections will be made in a blog post or in an article.
- PixController of Murrysville honored by Audubon Society of Western Pennsylvania for camera trained on Pittsburgh eagle nest
- Home invasion reported in Tarentum
- Harrison woman burned in trailer fire
- PennDOT response fails to satisfy New Kensington’s safety concerns about Route 366
- A-K Valley public pools deal with deficits, repair costs, lower attendance
- Gas prices are falling, but Pittsburgh area lags behind average
- Saxonburg man pleads no contest to setting boy, 7, on fire
- Woman who stabbed while naked in McKees Rocks believed to be in New Kensington area
- Lower Burrell officers recognized for ending theft ring
- Leechburg Area School District contracts with Pittsburgh firm for online database
- Charges filed in June stabbing of Buffalo Township sailor