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NATIONAL STORM SUMMARY
1-6: Monsoonal thunderstorms continued to impact the Southwest on Wednesday, while a cold front brought stormy weather to the Southeast. A plume of monsoonal moisture lingered over the lower Intermountain West and the Desert Southwest. Daytime heating triggered widespread showers and thunderstorms across the region on Wednesday. Flash flood warnings were issued for parts of Arizona and New Mexico. Flash flood watches were also issued in southeast California, southern Nevada, southern Utah, southwest Colorado, New Mexico and Arizona. Sedona, Ariz., reported a midday total of 0.99 of an inch of rain. Las Vegas, N.M., reported a midday total of 0.50 of an inch of rain. Just to the north, a low pressure area triggered isolated thunderstorms across the northern high Plains. High wind warnings were issued in Wyoming. Buffalo, Wyo., recorded wind gusts of 58 mph. Back east, a cold frontal boundary stretched from the southern Mid-Atlantic to the middle Mississippi Valley. Moisture-rich air interacted with this frontal boundary, which lead to the development of showers and thunderstorms in the Midwest, the Tennessee Valley, the southern Appalachians and the Deep South. A flash flood warning was issued in western North Carolina. Severe thunderstorm warnings were also issued in southwest Kentucky. Georgetown, S.C., reported a midday total of 2.42 inches of rain. Galax, Va., reported a midday total of 2.19 inches of rain. Stormy weather also battered a large part of the Florida Peninsula. Fort Myers, Fla., reported a midday total of 2.07 inches of rain on Wednesday.
Heavy rain affected portions of the Southeast on Friday, while monsoonal thunderstorms developed across the Four Corners. A slug of moisture moved onshore over the Gulf Coast. Heavy rain and embedded thunderstorms battered parts of southern Louisiana and western Florida. Boothville, La., reported a midday total of 1.46 inches of rain. Scattered showers and thunderstorms also impacted portions of the Deep South, the southern Mid-Atlantic and the Appalachians. Flash flood watches were issued for West Virginia and eastern Kentucky. Rome, Ga., reported a midday total of 1.54 inches of rain. Beaufort, S.C., reported a midday total of 1.05 inches of rain. Meanwhile, a cold frontal boundary stretched southwestward from southeast Canada to the southern Plains. Showers and isolated thunderstorms formed along and ahead of this frontal boundary over parts of the Midwest and the Plains. Keokuk, Iowa, reported a midday total of 2.14 inches of rain. Chillicothe, Mo., reported a midday total of 1.91 inches of rain. Out west, monsoonal thunderstorms persisted across the Four Corners and the Great Basin. Flash flood watches were issued in northeast Arizona, Utah, Colorado and New Mexico. Scottsdale, Ariz., reported a midday total of 1.32 inches of rain. Phoenix, Ariz., reported a midday total of 0.52 of an inch of rain.
7-13: Heavy rainfall and flooding persisted over the Southeast on Monday as abundant tropical moisture lingered over the region. Low pressure over the Southeast continued pulling ample moisture onshore, producing moderate to heavy rainfall across Florida and the Gulf states, stretching northward across the Carolina and into the Virginias. This region has seen heavy rainfall for multiple days in a row and thus the ground is very saturated. Flood warnings and advisories have been issued across the region with heaviest rainfall reported in northern Florida and central North Carolina. Saint Petersburg Airport, Florida reported a midday total of 2.19 inches of rain, while Morganton, North Carolina reported 2.97 inches of rain. West of this activity, monsoonal moisture over the Four Corners in combination with a trough of low pressure allowed for showers and thunderstorms to develop over Colorado, New Mexico, and eastern Arizona. Moisture from this system advanced eastward into the central Plains and produced heavy rainfall for parts of Kansas and Oklahoma. Wichita, Kansas reported a midday total of 3.21 inches of rain early on Wednesday. North of this system, a trough of low pressure advanced into central Canada and allowed for rain over the northern Rockies and northern Plains to move northward and out of the region.
Meanwhile in the Northwest, another low pressure system moved onshore and triggered rain showers across Washington and northern Oregon. Periods of heavy rainfall and areas of flash flooding are anticipated with this system.
A wet low pressure system in the Gulf of Mexico continued to pour deep moisture into the Southeast, producing widespread showers and thunderstorms. The heaviest of the rain fell along the coast from Louisiana through the Florida Panhandle, adding to the several inches of rain that has already fallen on the area. Meanwhile, monsoon moisture streamed into the Southwest from Mexico, which is fairly normal for this time of year. This moisture produce mostly scattered showers and thunderstorms in the Four Corners area, with some of these thunderstorms producing heavy rain.
Weather Underground midday recap for Friday, August 12, 2016
The Southeast saw more heavy rainfall on Friday, while a frontal boundary created some showers and thunderstorms for the Northeast and Midwest. A low pressure system and tropical moisture lingered over the northern Gulf of Mexico and continued pushing abundant moisture into the Gulf States. Dangerous flooding occurred in southern Louisiana as the region has seen heavy rainfall for most of the week since Sunday. By midday on Friday, many areas of southern Louisiana reported over 3 inches of rainfall with the heaviest rainfall reported in New Iberia, Louisiana with a midday total of 10.48 inches of rain. This created an severe flooding event with flood warnings issued for most of the region as rainfall rates reached 3 to 3.5 inches per hour. Please take caution and do not drive in these extremely dangerous conditions. Meanwhile to the North, a trough of low pressure and associated cold front triggered scattered showers from the Northeastern states through the Great Lakes and Midwest. Rainfall totals ranged from 1 to 2 inches for many areas. This system had a slight chance of severe thunderstorm development, but severe storms have not yet developed with this system. Main threats were strong winds and large hail. Out West, monsoonal moisture lingered over the Four Corners and allowed for a few more afternoon showers and thunderstorms to develop across eastern Arizona and New Mexico.
14-20: A low pressure area brought heavy rain to the Mississippi Valley on Monday. An area of low pressure transitioned northeastward across the middle Mississippi Valley. This system brought moderate to heavy rain and embedded thunderstorms to the interior Mid-Atlantic, the Midwest and the middle Mississippi Valley. Flood warnings and flash flood watches were issued from northeast Arkansas to southern Michigan. Cahokia, Ill., reported a midday total of 3.44 inches of rain. St. Louis, Mo., reported a midday total of 2.42 inches of rain. A weak frontal boundary associated with this system extended south southwestward. Rain and thunderstorms fired up along and near this frontal boundary over the southern Plains and the lower Mississippi Valley. Flash flood watches and flood warnings were issued in southeast Texas and southern Louisiana. Cotulla, Texas, reported a midday total of 2.22 inches of rain. Meanwhile, scattered monsoonal thunderstorms popped up across the central and southern Rockies, as well as the eastern edge of the Great Basin. Most areas west of the Continental Divide experienced warm and dry weather on Monday. Heat advisories remained in place for parts of southern California. Palm Springs, Calif., recorded a midday high of 105 degrees. Bullhead City, Ariz., recorded a midday high of 107 degrees.
Active weather persisted from the southern Plains to the Mid-Atlantic on Wednesday, while monsoonal thunderstorms developed across the Intermountain West. A low pressure area drifted over New England. A cold frontal boundary associated with this system stretched southwestward across the coast of New England, the Mid-Atlantic and the central Appalachians. This frontal boundary generated rain and embedded thunderstorms over parts of the Northeast, the Mid-Atlantic and the Midwest. Food warnings and flash flood warnings were scattered across the Mississippi Valley, the Midwest and the interior Mid-Atlantic. Owensboro, Ky., reported a midday total of 2.80 inches of rain. Cincinnati, Ohio, reported a midday total of 1.54 inches of rain. Moisture-rich air also kept rain and thunderstorms in the picture for portions of the southern Plains, the lower Mississippi Valley and the Southeast. Flood warnings and flash flood warnings were issued for parts of Texas, Arkansas and Louisiana. New Iberia, La., reported a midday total of 2.15 inches of rain. McGregor, Texas, reported a midday total of 2.03 inches of rain.
Out west, monsoonal thunderstorms continued to pop up across the central and southern Rockies, as well as the Desert Southwest. Flood advisories were issued in parts of Arizona and New Mexico. Most of the West Coast experienced warm and dry weather on Wednesday.
Many areas of wet weather developed across the US on Friday as multiple weather systems moved through the nation. A cold front triggered scattered showers and thunderstorms from the southern Plains through the upper Midwest on Friday. Moderate to heavy showers and thunderstorms developed from the Great Lakes through Texas. This system had a slight chance of severe thunderstorm development across the central Plains with the main threats of strong winds and large hail possible from northern Oklahoma through Iowa. Severe storms have not yet developed and heaviest rainfall was reported at Volk, Wisconsin with a midday total of 2.22 inches of rain. The back side of this system also allowed for heavy rainfall to develop across the northern Plains and northern Rockies, with the heaviest rainfall reported at Spearfish, South Dakota with a midday total of 1.20 inches of rain.
Active weather affected the Plains and the Mississippi Valley on Friday, while a ridge of high pressure kept conditions dry across the West Coast. A weak disturbance brought showers and thunderstorms to the northern and central Plains. Custer, S.D., reported a midday total of 0.72 of an inch of rain. Rapid City, S.D., reported a midday total of 0.63 of an inch of rain. Meanwhile, a frontal system extended southwestward from the Northeast to the southern Plains. Rain and thunderstorms developed along and near this frontal boundary over the Mississippi Valley, the central Plains and the southern Plains. Flash flood warnings were issued in western Tennessee. Flood warnings and flood advisories were issued in parts of southern Illinois, southeast Missouri, Arkansas, southeast Oklahoma and Texas. Sallisaw, Okla., reported a midday total of 2.11 inches of rain. Siloam Springs, Ark., reported a midday total of 1.79 inches of rain. Most areas west of the Continental Divide experienced warm and dry weather on Friday. Heat advisories were issued for portions of western Oregon and western Washington. Portland, Ore., recorded a midday high of 81 degrees. Los Angeles, Calif., recorded a midday high of 76 degrees.<
Jim G. Munley, jr.
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