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Big Story Weather – September 20, 2012

September 20, 2012

redOrbit Meteorologist Joshua Kelly

Big Story Weather from September 19: A weak frontal boundary moved through the Great Lakes and brought some precipitation to places like Chicago and around Lake Michigan. The big story was the cold air that took hold over the Plains and also parts of the Northeast. The warm air continued over the western part of the United States. Severe weather was limited to WI with hail and wind reports the main threat.

Weather Outlook for September 20: A cold front is moving through the Great Lakes region bringing with it a chance of showers into WI and portions of Michigan. High pressure controls the weather form the Mid-Atlantic to the Southeast and then back into the Central Plains. A very nice, and warm day out in the western part of the United States. A look across the United States at a few forecasts…

New York  P/C  72F   Miami thunderstorms 88F   Dallas P/C  89F   Omaha P/C  70F   San Diego P/C  79F

Big Story International Weather: High pressure between Japan and the Korea´s will bring nice weather conditions to the area for today. The monsoonal rains will be lighter around Southeast Asia including India. High pressure over Europe will bring partly to mostly cloudy skies. Interaction between the low pressure which is east of the Southern tip of South America and high pressure which is slowly moving into the area will bring stronger winds and also an increase in cloud cover. High pressure over Australia will make for another dry, cool day.

Tropical Update:

Atlantic Basin: Tropical Storm Nadine continues to turn out towards the Azores islands with estimated winds near 45kts and a pressure of 990mb. Another area 94L is beginning to get better organized this morning as it slowly turns towards the West. Estimated winds are around 30kts with a pressure of 1010mb.

Eastern Pacific: One area of interest is 93E that is currently sitting off the coast of Mexico with winds around 20kts and a pressure of 1009mb.

Western Pacific: 92W this morning continues moving slowly to the west as it’s just east of the Philippines with winds of 20kts and a pressure of 1007mb.

ENSO Watch: This shift is beginning to happen as we are now beginning to see in the United States moisture starting to flow in from the Southern branch of the jet-stream.

Ocean Systems: A strong frontal system is moving into the Gulf of Alaska bringing with it very strong winds and rains to the Southern Coast of Alaska today.

Five Day Storm Outlook for Sep 20-24:

New York NY: A quite period until the 22nd when the cold front moves through bringing a chance for some thunderstorms, then on the 23rd the chance drops to slight impacts.

Miami FL: Thunderstorms are likely each day with the stronger potential of impacts occurring on the 21st and also the 24th.

Dallas TX: High pressure will keep the region impact free.

Omaha NE: The colder drier air will keep the region impact free.

San Diego CA: The very warm and dry air that is over place will keep this region impact free.

Climate Watch for the period of September 15-19:

New York NY: A fairly tranquil week with temps ranging from 1-3 above average all the way to 1-3 degrees below average.

Miami FL: A cool start to the period with temps at or just below average followed by a 3 degree above average rise.

Dallas TX: Temps have been below average from 4-17 degrees, while the 19th temps went about 2 degrees back above average.

Omaha NE: Temps trended towards the cooler side ranging from 3-10 degrees below average, while the 19th temps went to 8 degrees above average.

San Diego CA: Temps have been above average this entire week.

Major Weather Impacts Discussion for September 20, 2012:

Day 1-3: A clipper system is moving through the Great Lakes, while the majority of the country is dealing with high pressure and nice weather. It is warm on the West Coast and the stationary boundary is bringing rain to South Florida.

Day 4-7: High pressure will keep a good portion of the country dry, while a weak low will begin to develop out in the Rockies and also the potential for another Hurricane in the Eastern Pacific.

Day 8-12: A frontal system will extend through the Midwest and also portions of the Northeast, along with that high pressure will be in control of a good portion of the US again. Also the Eastern Pacific Hurricane could make landfall in the Baja bringing its moisture into Southern CA and Arizona.

Day 13-15: Another frontal boundary will be moving through the Plains and also impacting the Great Lakes region. Behind that will be very cold air with temps dropping into the 20´s for some places. Also a surge of moisture will be picked up along the Northern Gulf Coast during this time period.

Today’s Spotlight City Forecast is for Sioux Falls South Dakota

Today: Partly Cloudy and cool with high temps in the upper 60´s with a light Northwest wind around 8mph. Overnight lows will drop into the mid 40´s.

Friday: Partly Cloudy and a tad warmer with high temps in the lower 70´s, along with light northwest winds around 7mph. The overnight lows will be around 30F, which will create some areas of frost.

Saturday: Another partly cloudy day with very cool temps as they will only get to around 60F. Look for low temps to reach the lower 30´s with another chance of frost.

Sunday: Partly cloudy and mild with high temps near 71F. Winds will be from the Southwest around 5mph. Overnight lows will be around 46F.

Monday: Sunny and warmer with high temps near 77F. Winds will be from the South around 7mph along with overnight lows near 46F.

Ask The Weatherman for September 20:

Question: What height do Cumulus-nimbus clouds get to?

Answer: Today´s question is a good one. The thing to understand with Cumulus-nimbus clouds is that they can extend to great heights. The base of, or bottom, of these clouds is usually around 3,000ft while the tops can extend to normally around 20,000ft. However it is very possible to see some get to near 45,000ft or higher in the summer months.

* To have your question of the day answered make sure to visit redOrbit on Facebook.

Green Energy Weather Report for September 20:

*NEW* Our Green Weather Report will help you monitor the conditions of your new Green Energy sources and how their production will handle today´s weather conditions.

Wave Energy: The Pacific Northwest will be another wave-generating area today as that low continues to move into Southern Alaska. The Northeast will have a moderate northerly flow which will be good for wave action.

Solar Energy: The Gulf Coast will have excellent solar energy conditions today as the high pressure is still bringing very clear, crisp air to the region. Another region of great solar impacts will be the Southwest today as a large amount of sunshine will be available for the area.

Wind Energy: The Great Lakes and Northern Plains will have a fair amount of winds today that will support a good wind energy day. Both of these places will see winds from around 7-12mph which is favorable for wind energy.


Source: redOrbit Meteorologist Joshua Kelly

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