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Last Updated: 12:51 PM GMT on May 13, 2013
— Last Comment: 12:51 PM GMT on May 13, 2013
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TGIF!
Weather Synopsis After the last few days of mostly dry weather, today we're going to be in for something different. A mostly cloudy sky this morning will turn darker as a line of showers and thunderstorms, currently just west of the Mississippi River, moves eastward into Wisconsin. Heavy rainfall is a good possibility, and the Storm Prediction Center in Norman, Oklahoma has placed us under the slight risk for severe weather today, mostly for the threat of large hail and damaging winds. Temperatures will stay mild today as a warm front moves though, but a trailing cold front will bring another chance of showers and thunderstorms to Wisconsin tomorrow, then wraparound moisture behind the low pressure system could make for a cloudy, cooler and drizzly day on Sunday. http://www.hpc.ncep.noaa.gov/sfc/ussatsfc.gif Today’s Forecast Grade: B- Wisconsin Forecast: Today: Mostly cloudy this morning. Showers and thunderstorms developing this afternoon and this evening. Heavy rainfall is possible along with the slight risk of the storms becoming severe. High of 82. Chance of rain 70%. Tonight: Cloudy and breezy with scattered showers and thunderstorms a good bet. Lows lower 60s. Chance of rain 80%. Saturday: Mostly cloudy, breezy and a little cooler with more scattered showers and thunderstorms expected, although they probably will not reach severe levels. Highs mid- 70s. Chance of rain 60%. Sunday: Mostly cloudy, still a little breezy and cooler with light rain showers or drizzle passing through from time to time. Highs near 70. Chance of rain 40%. Next Week: Monday: Partly sunny, highs 71-76. Tuesday: Partly sunny, maybe an evening thundershower north, highs 73-78. Wednesday: Partly sunny, highs 76-81. Other City Forecasts: This Weekend in Minneapolis/St. Paul, Minnesota: Scattered storms today and tomorrow, isolated showers on Sunday. Highs near 80 today, lower 70s tomorrow, then mid- 70s on Sunday. http://www.wunderground.com/US/MN/Minneapolis.html http://www.weather.com/outlook/travel/businesstraveler/local/USMN0503 This Weekend in Evansville, Indiana: Scattered showers and thunderstorms through Sunday afternoon, highs upper 80s to near 90 today and tomorrow and lower 80s on Sunday. http://www.wunderground.com/US/IN/Evansville.html http://www.weather.com/outlook/travel/businesstraveler/local/USIN0190 This Weekend in League City and Pearland, Texas: Scattered showers and thunderstorms, highs upper 80s to lower 90s. http://www.wunderground.com/US/TX/League_City.html http://www.weather.com/outlook/travel/businesstraveler/local/USTX0745 http://www.wunderground.com/US/TX/Pearland.html http://www.weather.com/outlook/travel/businesstraveler/local/USTX1029 This Weekend in Hilton Head Island, South Carolina: Scattered showers and thunderstorms, highs mid- to upper 80s. http://www.wunderground.com/US/SC/Hilton_Head_Island.html http://www.weather.com/outlook/travel/businesstraveler/local/USSC0155 This Weekend in Las Vegas, Nevada: Sunshine, hot, highs around 105. http://www.wunderground.com/US/NV/Henderson.html http://www.weather.com/outlook/travel/businesstraveler/local/USNV0040 This Weekend in Davenport, Florida: Numerous afternoon and evening showers and thunderstorms each day. Go figure. Highs lower 90s. http://www.wunderground.com/US/FL/Davenport.html http://www.weather.com/outlook/travel/businesstraveler/local/USFL0104 Weather in the News: Typhoon toll in Philippines could pass 1,000 * NEW: Death toll has risen to more than 500 people killed and could go much higher * NEW: Over 900 people still listed as missing, including 669 passengers from a ferry * NEW: Of ferry's 849 passengers, 124 are confirmed dead, 56 have been found alive * U.S. military has sent naval craft to assist in relief and search-and-rescue efforts http://www.cnn.com/2008/WORLD/asiapcf/06/26/philippines.ferry/index.html#cnnSTCText North Pole could be ice-free this summer, scientists say * Ice retreated to a record level last fall when the Northwest Passage opened briefly * Weather patterns will determine whether the ice cover melts completely this summer * Scientists say the Arctic meltdown is not part of a historic cycle http://www.cnn.com/2008/WORLD/weather/06/27/north.pole.melting/index.html?iref=mpstoryview ...National lightning safety awareness week is June 22-28... ...Today's topic...the science of lightning... ---at any given moment...there are 1,800 thunderstorms in progress somewhere on the Earth. This amounts to 16 million storms each year! No wonder lightning has fascinated and frightened people. ---The formation of ice in a cloud appears to be a very important element in the development of lightning...and those storms that fail to produce quantities of ice may also fail to produce lightning. In a storm...the ice particles vary in size from small ice crystals to larger hail-stones...but in the rising and sinking motions within the storm there are a lot of collisions between the particles. This causes a separation of electrical charges. Positively charged ice crystals rise to the top of the thunderstorm...and negatively charged ice particles and hail-stones drop to the middle and lower parts of the storm. Enormous charge differences...or electrical differentials...develop. ---A moving thunderstorm gathers another pool of positively charged particles along the ground that travel with the storm. As the differences in charges continue to increase...positively charged particles rise up taller objects such as trees...houses...and telephone poles. Have you ever been under a storm and had your hair stand up? Yes...the particles also can move up your body! This is one of nature/S warning signs that says you are in the wrong place... and you may be a lightning target! ---The negatively charged area in the storm will send out a charge toward the ground called a stepped Leader. It is invisible to the human eye...and moves in steps in less than a second toward the ground. When it gets close to the ground...it is attracted by all these positively charged objects...and a channel develops. You see the electrical Transfer in this channel as lightning. There may be several return strokes of electricity within the established channel that you will see as flickering lightning. ---The lightning channel heats rapidly to 30,000 degrees. The rapid expansion of heated air causes the thunder. Since light travels faster than sound in the atmosphere...the sound will be heard after the lightning. If you are ever in a storm when you see the lightning and hear the thunder at the same time...that lightning is in your neighborhood! ---Not all lightning forms in the negatively charged area low in the thunderstorm cloud. Some lightning originates in the cirrus anvil at the top of the thunderstorm. This area carries a large positive charge, and lightning from this area is called positive lightning. This type is particularly dangerous for several reasons. It frequently strikes away from the rain core...either ahead or behind the thunderstorm. It can strike as far as 5 or 10 miles from the storm...in areas that most people do not consider to be a lightning risk area. The other problem with positive lightning is it typically has a longer duration...so fires are more easily ignited. Positive lightning usually carries a High Peak electrical current...which increases the lightning risk to an individual. For additional information about lightning or lightning safety... visit noaa's lightning safety awareness web site at: Http://www.Lightningsafety.NOAA.Gov /lower case letters/
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