Derecho Debate, More Heat and More Storms
Wednesday, July 25th, 2012
Thanks to the National Weather Service from Albany, NY for the picture below out of Pleasant Valley.
“A severe thunderstorm produced straight-line wind damage in Dutchess County yesterday afternoon at about 4:30 pm. Photo is from a section of State Route 44 in the town of Pleasant Valley between the Taconic State Parkway and Route 82. Photo is courtesy of Dutchess County Emergency Management.”
Severe Weather Reports From Wednesday
The storm report map from Wednesday shows a little over 200 preliminary reports of hail and high winds, a majority of these reports were from the long lived line of storms producing wind damage Monday night/early Tuesday crossing 5 states from southern Wisconsin to extreme eastern Kentucky (arguably into Virginia or northeastern Tennessee).
There is some question whether or not Monday night’s/early Tuesday’s storm complex was a Derecho.
The text below is from examiner.com:
“Originally just a thunderstorm complex (MCS) that had developed along a northwest to southeast frontal boundary across portions of Minnesota and South Dakota late last night, the storms moved into a more favorable atmosphere for strengthening and began to produce wind damage across southwestern Wisconsin earlier this morning. After travelling approximately 280 miles (from southwestern Wisconsin to northeast Illinois to northern Indiana) with winds between 60 and 80 mph, this thunderstorm complex was safely classified as a small derecho.“
The text below is from SPC.com:
“Definition of a derecho: A derecho (pronounced similar to “deh-REY-cho” in English, or pronounced phonetically as ““) is a widespread, long-lived wind storm that is associated with a band of rapidly moving showers or thunderstorms. Although a derecho can produce destruction similar to that of tornadoes, the damage typically is directed in one direction along a relatively straight swath. As a result, the term “straight-line wind damage” sometimes is used to describe derecho damage. By definition, if the wind damage swath extends more than 240 miles (about 400 kilometers) and includes wind gusts of at least 58 mph (93 km/h) or greater along most of its length, then the event may be classified as a derecho.“
“Strength of derecho winds: By definition, winds in a derecho must meet the National Weather Service criterion for severe wind gusts (greater than 57 mph) at most points along the derecho path. But in stronger derechos, winds may exceed 100 mph. For example, as a derecho roared through northern Wisconsin on July 4, 1977, winds of 115 mph were measured. More recently, the derecho that swept across Wisconsin and Lower Michigan during the early morning of May 31, 1998 produced a measured wind gust of 128 mph in eastern Wisconsin, and estimated gusts up to 130 mph in Lower Michigan.”
Thanks to @vic10city for the damage picture below out of Chicago, IL:
Thanks to @gaffino for the damage picture below out of Aurora, IL:
This is From Meteorologist Tom Skilling @Skilling
The text below is from the Bluefield Daily Telegraph:
“PRINCETON — Few power outages and some telephone damage at a Mercer County retirement village were reported Tuesday after a forecasted storm fizzled as it swept over southern West Virginia and Southwest Virginia.
Severe thunderstorms were forecasted early in the day, but the threat abated over time, said meteorologist Phil Manuel with the National Weather Service in Blacksburg, Va.
Manuel stressed that the expected storm was not a “derecho,” the type of powerful, straight-line windstorm that knocked out power cross West Virginia and Virginia on June 29. Tuesday’s storm “was not even close,” he said.”
Derechos: Widespread Convectively Induced Windstorms
A paper written by Robert H. Johns and William D. Hirt goes more in depth with the specifics of a derecho, which you can read HERE:
More Severe Storms Today
The Storm Prediction Center has a SLIGHT RISK of severe weather for areas shaded in yellow below. Hail and high winds will be the primary threat, but an isolated tornado can’t be ruled out around the Central Great Lakes Region.
Severe Threat Thursday – MODERATE RISK
The storm system by Thursday will slide into the Ohio River Valley with showers and thunderstorms through the morning hours, but as daytime heating takes place additional thunderstorms with even more oomph look to get going. The Storm Prediction Center has issued a MODERATE RISK of severe weather for areas shaded in red… this is the most significant threat of severe weather we’ve seen in some time. Make sure you stay sky aware during the day tomorrow and have those severe weather radios handy.
Heavy Rainfall Potential
NOAA’s HPC 3 day rainfall forecast with this storm system could have pockets of 1″ to 3″+ amounts from the Great Lakes Region into the Northeast.
Excessive Heat Continues
The National Weather Service continues excessive heat headlines for counties highlighted below. Dangerous afternoon heat index values could near 110F in a few spots!
Actual Highs Today
These are the forecast highs today
Cooler Temps on Friday
Temperatures behind the cold front by the end of the week will be somewhat cooler into the Great Lakes Region and the Ohio River Valley… It’ll be a nice (brief) reprieve from the excessive heat and humidity as of late.
Cool as a Cat
I thought this was worthy of sharing… I was always under the assumption that cats hated water, but I guess this cat doesn’t mind – LOL
Thanks for checking in on this Wednesday, have a great rest of the week!
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