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June 21, 2010 / Dave Gorham

First Day of Summer and July Outlook

As Fred mentioned earlier…today is the first day of summer which officially began at approximately 7:28 am EDT this morning. This is also the longest day of the year as the days have been getting longer and the nights shorter. During the summer months we get more daylight because the sun is higher in the sky and it takes a longer path across our sky. We also get more of the sun’s direct rays and, when you combine these factors, this is what gives us the warm summer season.


Temperature outlook for July 2010. Image: ImpactWeather

If you live in the south it’s probably felt like summer started a few weeks ago with the above average temperatures we’ve seen and the high humidity with heat index values topping out at or above 100 degrees across portions of Texas, Oklahoma and into the Southeastern U.S. July tends to be one of the hottest, if not the hottest, month in the U.S. and it looks like above normal temperatures are expected across the Deep South extending west towards Texas and Oklahoma. The best chance of above normal temperatures will be across Texas. Farther to the north, above normal temperatures are also expected across the Pacific Northwest extending eastward to the central and northern Rockies, and from the Great lakes region to New England. Elsewhere, near normal temperatures are expected from the southern Rockies to the Central and Northern Plains, and from the Mid Mississippi Valley to the Mid Atlantic Coast from New Jersey to South Carolina.


Precipitation Outlook for July 2010. Image: ImpactWeather

Not only are above average temperatures expected across portions of the Plains and Southeast but also above normal precipitation. Long range rainfall data indicates that a widespread area of above normal rainfall will be possible from the Northern and Central Plains, south and east across the mid Mississippi Valley to the eastern Gulf Coast from Mississippi to the Florida Panhandle. The best chance for above normal rainfall will extend across the Mid Mississippi Valley. Farther north over the Great Lakes region, we expect below normal rainfall to occur as soil moisture is currently quite dry and we expect the dry pattern to persist into July. Near normal precipitation is expected across the West Coast, Rockies, Texas, and from New England southward through the Mid-Atlantic States down to Florida.

In other words, for most of us a long, hot and dry summer. Bring on the ice cream man!

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