A multiday severe weather outbreak continues to hammer the Midwest and Plains States, and the National Weather Service is warning that the Oklahoma City area, which was devastated by the Moore tornado earlier this month, may see more significant tornadoes on Friday. The severe thunderstorms are likely to form along a frontal zone that is draped from the Midwest down to the Plains, with a disturbance at the upper levels of the atmosphere adding a necessary spark to the already unstable situation.
Computer projection showing the Convective Available Potential Energy (CAPE) on Friday afternoon, with a maximum centered in Oklahoma. CAPE is one measure of how unstable the atmosphere is.
Click image to enlarge. Credit: Weatherbell.com
Temperatures have exceeded 100°F in parts of the Sooner State, and the Storm Prediction Center in Norman has issued a tornado watch with a "Particularly Dangerous Situation" designation, meaning that there is a likelihood of significant tornadoes in the watch area. That so-called "PDS watch" includes the Oklahoma City metro area and is in effect until midnight Friday, central time. Another tornado watch was in effect for eastern Kansas and much of central Missouri as of 4 p.m., with more to come as storms fire up toward early evening.
The NWS Office, which was widely praised for the advanced notice it provided to Moore residents during that EF-5 tornado event, issued a steady stream of specific tornado outlook and safety information via its social media accounts on Friday. For example, on its Twitter account, the NWS warned: "Times may change, but I would not want to be driving anywhere in the OKC metro after 4 p.m. today. Tornadoes not certain, but be ready!"...
A tornado outbreak on Sunday left at least two people dead in Oklahoma and nearly two dozen injured after the busiest day in what had been an unusually tame 2013 tornado season.
The Shawnee, Okla., tornado that caused major damage southeast of Oklahoma City on May 19.
Credit: TornadoTitans.com/Brett Wright via Facebook.
Severe thunderstorms struck from Oklahoma all the way to Minnesota as a strong cold front edged eastward, plowing into warm and humid air. Strong upper-level winds provided support for supercell thunderstorms, which are thunderstorms that have persistent rotation associated with them, and can cause tornadoes and damaging large hail.
Video footage of the Shawnee, Okla., tornado from Brandon Sullivan/Wicked Wind Media
Several cities narrowly missed direct hits, including Oklahoma City and Wichita, Kan. In Wichita, a tornado touched down near the Mid-Continent Airport, and a “tornado emergency” was declared for the city. On the livefeed of KSN-TV’s storm coverage, the sound of large hail striking the studio’s rooftop was audible, and the TV meteorologists hastily retreated to the station’s storm shelter, leaving an eerily silent radar image on the screen.
A total of 24 tornado reports were received by the Storm Prediction Center in Norman, Okla. The Weather Channel broadcast at least two large tornadoes live as they formed and strengthened, including one of the most damaging twisters, which struck near Shawnee, Okla. The National Weather Service gave the Shawnee tornado a preliminary rating of EF-4 on the Enhanced Fujita Scale, with winds of up to 200 mph.
After months with record-low activity, the 2013 tornado season roared back with a vengeance on Wednesday as at least 10 twisters touched down across portions of north-central Texas, killing at least 6 and injuring dozens more. An even broader outbreak of severe weather, including the threat of more tornadoes, is forecast this weekend from North Texas to Missouri, gradually shifting eastward with time.
Eyewitness video of one of the Texas tornadoes on Wednesday.
The hardest-hit community on Wednesday evening was Granbury, about 40 miles southwest of Fort Worth. Hood County Sheriff Roger Deeds told the media that an entire neighborhood, consisting of 100-plus homes, was “heavily damaged to destroyed.”
There were reports that the Granbury tornado was as large as 1-mile wide, and aerial footage on Thursday morning revealed a broad swath of destruction. The town received a tornado warning 20 minutes in advance, according to Reuters. Preliminary reports from the National Weather Service show the tornado was at least an EF-4 on the Enhanced Fujita Scale, with winds of between 166 to 200 mph. Damage surveys have found homes that were completely swiped aside, and reduced to mere concrete slabs.
The Texas tornado fatalities were the second in the Lone Star State since 2007 — an unusually long stretch for a state that typically sees 8 deaths per year, based on statistics from 1961-1990.
For the U.S., the deadly outbreak shatters the relative calm of t...
A late spring snowstorm in the Midwest has shattered longstanding state snowfall records, with all-time state records for the month of May falling in Iowa, Minnesota, and Wisconsin. The snowstorm, which walloped the region with snowfall rates of more than an inch per hour at times on May 1-2, delivered 18 inches of snow in Blooming Prairie, Minn., 17.5 inches in Goodhue, and 15.5 inches in Owatonna.
Snowfall measurement in Eau Claire, Wis.
According to the Minnesota Climate Working Group, the state daily May snowfall record had stood at 12 inches, which was most recently set on May 3, 1954. The Working Group said that the snowstorm was extremely rare for southern parts of the state.
“While May snowfalls are not uncommon in northern Minnesota, heavy May snowfall in southern Minnesota is rare. A quick scan of all historical Minnesota May daily snowfall totals greater than or equal to 3 inches indicates that May 1938 may have been the last time any southern Minnesota observer reported snowfall totals of similar magnitude,” the Working Group said on its website.
In Iowa, the 11 inches recorded at the town of Britt, which is in the north central part of the state, is also likely a state record. The 6.7 inches that fell in Des Moines was the city's biggest May snowstorm on record. In Wisconsin, 16.2 inches fell at Ashland, which also set a state record for the heaviest May snowstorm on record.
Also, up to 3 inches of snow fell in Arkansas, where measurable snow had never before been recorded...
Minneapolis-St. Paul narrowly missed a crushing, record-smashing snowstorm on Wednesday night into Thursday, as a band of extremely heavy snow stalled over the eastern suburbs of the Twin Cities. As of Thursday morning, some locations in southeast Minnesota had received more than 15 inches of snow, which is unprecedented this late in the year. Western Wisconsin was also seeing heavy snow, with more than a foot already on the ground and more to come throughout the day.
Records have likely been broken for single-day May snowfall in Iowa, Minnesota, and Wisconsin, and state snowfall records for the month of May have also been threatened in these states. The snow has been causing power outages by weighing down tree branches and power lines.
The snowy scene in Owatonna, Minn., on Thursday.
Credit: Twitter/Christian McKenzie
Had the storm hit only 50 miles or so further northwest, the Twin Cities would have been in the bullseye for at least a foot of snow, which would have shattered the all-time May snowfall record there, which stands at just 3 inches. That record, which was expected to be broken, may not be exceeded after all, since most of the snow has remained to the east of the Minneapolis-St. Paul International Airport, where official weather records are taken.
The freakishly heavy May snow totals in Minnesota, along with a barrage of similar storms during April, have helped to erase the long-term drought in the area, and in fact, have raised flooding concerns. As WeatherNation TV meteorologist Paul Douglas described the situation o...