Big Story Weather – September 20, 2013
redOrbit Meteorologist Joshua Kelly
Big Story Weather from September 19:
Yesterday was a very cold day for many places throughout the Northern Rockies with some snow falling in the higher elevations. Severe weather occurred along the frontal boundary with one tornado in Texas. The largest hail was recorded in Minnesota at 2 inches. The strongest winds occurred in Minnesota and Iowa with gusts in between 70-80mph. The cold air was also responsible for the first frost of the season in the Northern Rockies and also the Plains.
Big Story Weather Discussion for September 20:
Surface Map: A strong cold front is advancing through the Midwest and will be the focus for strong to severe storms today. High pressure over the Northern Plains will bring some of the season’s first frost conditions across the region. Low pressure over the Southwest will bring another round of showers and thunderstorms to the region. The West Coast will enjoy a warm and dry day.
Severe Weather: The focus for severe weather today will be along the frontal boundary which includes the potential for isolated tornadoes, large hail, damaging winds, and heavy rainfall especially over the southern boundary of the front. A second area of severe weather will be possible along the Gulf Coast. This region will see mostly heavy rainfall. The third is over the Southwest US. This region will see strong winds and heavy rainfall.
Winter Weather: High pressure moving in over the Plains will bring a chance for frost over the Dakotas this evening.
Flooding: Large portions of Texas will be dealing with heavy rainfall which could lead to some flooding.
Tropical Weather: We are watching low pressure area over the Southwest Gulf. There is the possibility for potential development this weekend as it continues to show signs of some strengthening.
Select City Forecast:
Pittsburg PA: Partly cloudy with a few evening thunderstorms. High temps around 78F and overnight lows near 63F. Total rainfall around 0.25 inches.
Gulfport MS: Partly cloudy with a few afternoon thunderstorms. High temps around 89F and overnight lows near 77F. Total rainfall around 0.25 inches.
Kansas City MO: Partly cloudy with scattered thunderstorms. High temps around 79F and overnight lows near 68F. Total rainfall near 0.35 inches.
Billings MT: Partly cloudy with a high near 82F and overnight lows near 65F.
Portland OR: Partly cloudy with a high near 85F and overnight lows near 56F.
September 20, 2013 Storm Tracker Update:
Eastern Pacific Ocean: Low pressure moving into the West Coast will bring showers to the region. Another area of low pressure will bring showers and thunderstorms to the Plains and the Mid-Mississippi River Valley.
Atlantic Ocean: A tropical wave over the Southwest Gulf is being watched for potential tropical development. A second area of low pressure along the southeast coast of the US will develop and rapidly push out to sea. Low pressure to the south of Greenland will bring high seas to the region. Another wave has emerged off the coast of Africa and will be watched for possible tropical development.
Western Pacific: Super-Typhoon Usagi continues to turn through the Western Pacific. Right now the storm is in between Taiwan and Manila PI. The storm currently has winds around 130kts and pressure near 926mb and will continue to move towards Eastern China bringing very dangerous conditions to the region. Two other areas over the Pacific are being watched for possible tropical development. Low pressure moving out of Russia will bring showers to Northeast Russia.
Indian Ocean: The southwest monsoon will be active again today with heavy rainfall over the region, especially into India and Sri Lanka.
Southern Hemisphere: Multiple areas of low pressure moving through the basin. Impacts are being felt over Southern Argentina with rain showers and snow showers. A second area of low pressure is impacting South Africa with rain showers and some higher elevation snow showers. A third wave is impacting southwest Australia with showers.
Five-Day Storm Index Outlook for September 20-24:
Pittsburg PA: Showers and thunderstorms will be possible each day over the region bringing a slight to moderate impact to the area.
Gulfport MS: The region will have slight to moderate impacts each day associated with showers and thunderstorms.
Kansas City MO: The region will have moderate impacts over the next couple of days. Then again at the end of the period more impacts are expected as another frontal boundary moves through the region.
Billings MT: The period will start out impact free. An area of thunderstorms will move during the middle of the period bringing slight to moderate impacts to the region.
Portland OR: The next five days will be impact free.
Climate Watch for September 15-19:
Pittsburg PA: Over the past few days temps have been around 1-6 degrees below normal. The period finished around 3 degrees above normal.
Gulfport MS: The past five days temps have been around 1-5 degrees above normal.
Kansas City MO: The period has had mixed temps with days around 3-17 degrees below normal and also temps around 3-17 degrees above normal.
Billings MT: The period started with temps around 2-10 degrees above normal and then finished the period around 2-6 degrees below normal.
Portland OR: The period started with temps around 3-8 degrees below normal. The period finished with temps around 4-6 degrees above normal.
Major Weather Impacts Discussion for September 20, 2013:
Day 1-3: Low pressure moving through the Great Lakes will bring a strong cold front through the Mid-Mississippi River Valley back into Texas. Expect to see severe weather and very heavy rainfall over the region. High pressure over the Northern Plains will bring cold air in overnight with many places falling to the lower 30’s with frost possible. A cold front will be approaching the West Coast and will bring showers to Seattle. Day two the cold front will push into the Northeast and extend all the way back to the Gulf Coast and into Texas. Expect heavy rainfall along with strong storms. We will also be watching a new low pressure area developing along the Northern Gulf Coast which will enhance the rainfall over the region. High pressure will bring another cold night to a good portion of the Plains and the Great Lakes. The showers will continue over the Pacific Northwest. The period will finish with a cold front over the Northeast bringing showers to the region. A low pressure area will move along the Northern Gulf which will bring moderate rainfall to the region. High pressure will continue to dominate the middle of the US, while showers push into the Northern Rockies. Some higher level snows will also be possible over the Rockies and the Cascades.
Day 4-7: The period will start with high pressure moving into the Northeast and the Eastern Lakes. Another storm system will move into the Northern Plains with showers and thunderstorms. The low pressure will also still be moving along the Gulf Coast bringing heavy rainfall to the region. Another cold front will push into the Pacific Northwest. Day six high pressure will be over the Great lakes, while another storm system moves into the Northern Plains.
Day 8-12: The period will start with low pressure and a cold front moving across the Great Lakes. High pressure will be along both coasts. Day ten a strong cold front will extend from the Northeast to the Gulf Coast bringing more rainfall and thunderstorms to the region. High pressure over the Plains will dominate a good portion of the weather from the Plains to the West. The period will finish with a massive area of high pressure dominating a good portion of the country and a tropical feature will start to take shape near Puerto Rico.
Long Range Outlook: The period will start with high pressure over most of the US. The middle of the period a strong storm system will be moving up the East Coast. Strong gradient over the Northern Plains will lead to strong winds and cold weather. The period will finish with another strong high pressure moving over the Plains bringing another round of cold air. We will also be watching the potential for the first snowfall over Northern Minnesota and the Northern Great Lakes.
Today’s Spotlight Forecast is for Sioux Falls SD:
Friday: Partly cloudy with a high near 67F. Winds will be from the northwest 9-14mph. Overnight lows near 36F. Patchy frost may be possible in some areas.
Saturday: Partly cloudy and warmer with a high near 72F. Winds from the southeast 5-10mph. Overnight lows near 49F.
Sunday: Partly cloudy with a high near 80F. Winds from the southeast 12-17mph. Overnight lows near 50F.
Monday: Partly cloudy with a high near 74F. Winds from the southeast 15-20mph. Overnight lows near 48F.
Tuesday: Partly cloudy with a high near 81F. Winds from the southwest 9-14mph. Overnight lows near 56F.
Ask The Weatherman for September 20, 2013:
Question: What is an outflow boundary?
Answer: Outflow boundaries develop along thunderstorms. When you see a large thunderstorm develop and all the cirrus clouds blow away and spread out over the top of the thunderstorm, this is called the outflow boundary and can be responsible for another thunderstorm to develop.
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Green Energy Weather Report for September 20, 2013:
Wave Energy: There will be slight to moderate amounts of energy along the Northeast and Mid-Atlantic region. Moderate to high amounts of energy will be over the Southeast US. The Gulf Coast will see slight to moderate amounts of energy. The Southwest will have high amounts of energy, while the Pacific Northwest will have moderate amounts of energy.
Solar Energy: There will be ample amounts of solar energy available over the Northeast. There will be moderate amounts of energy along the Gulf Coast and Southeast before the thunderstorms build in. There will be ample amounts of solar energy over the West Coast.
Wind Energy: The strongest amounts of wind energy will be over the Northern Plains behind the cold front and also over the Rockies behind the cold front.
Hydro-Energy: There will be ample amounts of energy over the Great Lakes through the Mid-Mississippi River Valley and back into Texas.
September 20 Weather and Your Wallet (Chicago IL):
A strong cold front moving over the region will bring some rainfall and strong winds.
Dining: There will be some impacts this afternoon from both the thunderstorms and the stronger winds off the lake.
Transportation: There will be some delays this afternoon between the rainfall and the stronger winds which will impact both the roadways and the airport.
Shopping: It will be a rainy afternoon so make sure to take your umbrella if you plan on doing some shopping.
Electricity: Today the colder air will begin to move in allowing for some heating that will be needed during the overnight hours. The forecast is for 4HDD’s.
Yard Work: This morning will be the best time for any last minute yard work. Or you could wait until this evening and enjoy the cooler weather.
Construction: There will be some impacts this afternoon due to thunderstorms and stronger winds.
Outdoor Venues: This afternoon there will be impacts along the lake front. This morning would be the best time for any outdoor activities.