Weather Underground midday recap for Friday, July 05, 2013.
Significantly cooler temperatures returned to the West on Friday, but heavy rainfall continued across the Southeast. A ridge of high pressure that has dominated across the West over the last week as weakened and shifted eastward, back over the Four Corners as onshore flow from the Pacific Ocean strengthened. This brought cooler air onshore, allowing for more seasonal high temperatures to return for most of California and the Pacific Northwest. However, inland areas of southern California and the Desert Southwest saw another hot day with high temperatures just above 100 degrees. These areas remained under excessive heat warnings on Friday. Monsoon moisture over the Desert Southwest and Great Basin maintained scattered showers and thunderstorms throughout the day.
In the East, a stationary front lingered over the Eastern Valleys as high pressure in the Atlantic Ocean pushed more warm and moist air northward from the Gulf of Mexico. This maintained heavy rainfall and strong thunderstorms from the Gulf coast through the Eastern Valleys on Friday. Thus, flooding remained a concern across most of the Eastern third of the nation as the region has seen heavy rainfall for most of the week. Heaviest rainfall was reported in Galliano, Louisiana with a mid-day total of 1.99 inches. Flash Flood Watches were issued for most of the region in anticipation for another 2 to 3 inches of rainfall.
Temperatures in the Lower 48 states Friday have ranged from a morning low of 41 degrees at Meacham, Ore. to a midday high of 107 degrees at Inyokern, Calif.