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NATIONAL STORM SUMMARY

 

SEPTEMBER 2016

 

1-10: Post-Tropical Cyclone Hermine impacted the Mid-Atlantic on Saturday, while a cold frontal boundary shifted over the northern tier of the country. Hermine was downgraded to a post-tropical cyclone on Saturday as it pushed north northeastward over the Mid-Atlantic. This system continued to bring dangerous storm surge and heavy rain to the Eastern Seaboard. Flash flood warnings and tropical storm warnings were issued from eastern North Carolina to southern Connecticut. Elizabeth City, N.C., reported a midday total of 3.51 inches of rain. Suffolk, Va., reported a midday total of 3.48 inches of rain. A weak frontal boundary extended southwestward over the Southeast and the Gulf Coast. Scattered showers developed along and near this frontal boundary from Florida to the western Gulf Coast. Meanwhile, a cold frontal boundary stretched southwestward the northern Plains to the Great Basin. As this frontal boundary transitioned eastward, it generated multiple clusters of showers and thunderstorms across the northern Plains, the central Plains and the Intermountain West. Flood warnings were issued in central Kansas. Flash flood watches were also issued in eastern Colorado and western Kansas.

 

A frontal system shifted across the northern tier of the country on Monday, while Post-Tropical Cyclone Hermine stalled out east of the Mid-Atlantic. A slow-moving frontal boundary stretched southwestward from the upper Midwest to the central Rockies. This frontal system generated multiple clusters of thunderstorms over the upper Mississippi Valley, the northern Plains and the upper Intermountain West. Sioux Falls, S.D., reported a midday total of 1.93 inches of rain. Spencer, Iowa, reported a midday total of 1.63 inches of rain. Cool air trailed this frontal boundary over the northern high Plains, the upper Intermountain West and the Pacific Northwest. This cooler air mass supported high elevation snow showers in the northern Rockies. Pinedale, Wyo., recorded a morning low of 33 degrees. Meacham, Ore., recorded a morning low of 28 degrees. Meanwhile, monsoonal thunderstorms popped up across portions of the lower Intermountain West, the Desert Southwest and the high Plains. Most of the Great Basin and the West Coast stayed clear of precipitation. Post-Tropical Cyclone Hermine continued to impact the northern Mid-Atlantic and southeast New England in the form of gusty winds, coastal flooding and scattered showers. Tropical storm warnings remained in effect from eastern Delaware to eastern Massachusetts. Additionally, an onshore flow from the Gulf of Mexico brought rain and thunderstorms to the Gulf Coast. Stormy weather also impacted the Florida Peninsula. Flood warnings were issued for southwest Louisiana on Monday. New Orleans, La., reported a midday total of 1.31 inches of rain.

 

Tropical Storm Newton impacted the Southwest on Wednesday, while a frontal system stretched from the Great Lakes to the central Rockies.  Tropical Storm Newton drifted north northeast over southern Arizona. This system ushered a plume of moisture over the Desert Southwest, the lower Intermountain West and the high Plains. Flood warnings and flood advisories were issued in southeast Arizona on Wednesday, while flash flood watches were issued for a large part of eastern Arizona and western New Mexico. Sierra Vista, Ariz., reported a midday total of 1.61 inches of rain. Fort Huachuca, Ariz., reported a midday total of 1.48 inches of rain. Meanwhile, a stationary front stretched southwestward from the Great Lakes to the central Rockies. Multiple clusters of thunderstorms fired up along and near this frontal boundary across the northern Plains, the Midwest and the interior Mid-Atlantic. Flood warnings were issued in northeast Iowa, southeast Minnesota and southern Wisconsin. Algona, Iowa, reported a midday total of 3.06 inches of rain. Juneau, Wis., reported a midday total of 2.86 inches of rain.  

11-17:  A low pressure system moved across the Plains on Thursday, while Tropical Depression Julia affected the Southeast. An area of low pressure moved east northeastward over the northern Plains. This system and a cold frontal boundary produced multiple clusters of rain and thunderstorms across the Rockies, the Plains and the Midwest. Flash flood warnings were issued for southeast South Dakota, southwest Minnesota and northwest Iowa. Sioux Falls, S.D., reported a midday total of 2.89 inches of rain. Luverne, Minn., reported a midday total of 1.17 inches of rain. To the south, flash flood warnings were also issued in north central Texas, southeast Oklahoma and south central Missouri. Fort Leonard Wood, Mo., reported a midday total of 0.82 of an inch of rain. Additionally, severe thunderstorm warnings were issued across eastern New Mexico. Clovis, N.M., reported a midday total of 1.88 inches of rain. Meanwhile, Tropical Depression Julia kept showers and thunderstorms in the picture for the coast of the Carolinas. Scattered storms also affected the Gulf Coast as a tropical disturbance formed over the northern Gulf of Mexico.

 

A cold frontal system brought active weather to the central third of the country on Friday, while high pressure kept most states dry along the West Coast. A low pressure area moved eastward across the northern Plains and the upper Mississippi Valley. This system, combined with a cold frontal boundary, generated multiple clusters of showers and thunderstorms across the northern Plains, the central Plains and the Midwest. Flash flood warnings were issued in Missouri on Friday. Flood warnings were also scattered across eastern Nebraska, eastern Kansas, Iowa and Missouri. Atlantic, Iowa., reported a midday total of 2.09 inches of rain. Rolla, Mo., reported a midday total of 0.90 of an inch of rain. Just to the south, a tropical wave of low pressure ushered rain and thunderstorms across the Gulf Coast. Coastal flood advisories were issued in southeast Texas. Flood warnings were also issued in southwest Louisiana. Beaumont, Texas, reported a midday total of 3.17 inches of rain. Galliano, La., reported a midday total of 1.46 inches of rain. Scattered showers continued to pop up along the southern Mid-Atlantic as Tropical Storm Julia lingered over the western Atlantic. Most areas across the northern Mid-Atlantic and New England experienced dry weather on Friday.

 

18-24: Active weather impacted the Plains and the Midwest on Wednesday, while the remnants of Hurricane Paine moved across the Southwest. A cold frontal boundary shifted east southeastward over the upper Mississippi Valley, the northern Plains and the upper Intermountain West. This frontal boundary collided with warm and humid air, which lead to the development of strong to severe thunderstorms. The strongest storms focused over the northern Plains and the upper Mississippi Valley on Wednesday. Flash flood warnings and severe thunderstorm warnings were issued in western Wisconsin. Flood warnings were also issued in parts of southern Minnesota and Iowa. Trempealeau, Wis., reported 1.25 inch sized hail. Sparta, Wis., reported a midday total of 2.78 inches of rain. Meanwhile, a wave of low pressure brought showers and thunderstorms to the Mid-Atlantic. Flood warnings and flood advisories were issued in parts of eastern Virginia and eastern North Carolina. Chesapeake, Va., reported a midday total of 4.74 inches of rain. Edenton, N.C., reported a midday total of 3.49 inches of rain.  Out west, subtropical moisture associated with the remnants of Hurricane Paine surged across the Southwest. Scattered showers and thunderstorms developed in southern California, southern Nevada and the Four Corners. In addition, a trough of low pressure generated scattered showers over the Northwest and the upper Intermountain West.

 

An area of low pressure shifted northeastward across the Intermountain West and the northern high Plains. A warm frontal boundary associated with this system extended eastward. This frontal boundary generated moderate to heavy rain and embedded thunderstorms over the northern Plains and the upper Midwest. Flood warnings were issued in southwest Wisconsin, southeast Minnesota and eastern Iowa. Clarion, Iowa, reported a midday total of 2.09 inches of rain. Madison, Minn., reported a midday total of 1.41 inches of rain. A cold frontal boundary extended south southwestward. Temperatures dropped 10 to 20 degrees below normal west of the frontal boundary. This cool air supported the development of high elevation snow in the northern Sierra Nevada, the Great Basin, the Wasatch and the Rockies. Meanwhile, a wave of low pressure continued to produce scattered showers and thunderstorms along the southern Mid-Atlantic. Flash flood watches were issued in southeast North Carolina. Just to the north, a cold frontal boundary generated light to moderate rain in parts of New England.

 

25-30: A low pressure area drifted slowly across the upper Midwest on Tuesday, while scattered storms popped up over the Southwest.  A robust area of low pressure moved slowly south southeastward across the Great Lakes. This system ushered rain and embedded thunderstorms over the upper Mississippi Valley and the Midwest. Ironwood, Mich., reported a midday total of 0.83 of an inch of rain. Drummond Island, Mich., reported a midday total of 0.58 of an inch of rain. A cold frontal boundary associated with this system extended southwestward. This frontal boundary initiated showers and thunderstorms across portions of southern New England, the Mid-Atlantic, the Southeast and the Gulf Coast. Port Isabel, Texas, reported a midday total of 1.62 inches of rain. Salisbury, Md., reported a midday total of 1.18 inches of rain. Meanwhile, an area of low pressure generated scattered showers and thunderstorms across the Desert Southwest.

 

A low pressure system stalled out over the Midwest on Friday, while a cold frontal boundary shifted across the Northwest.  A slow moving low pressure system drifted over the Midwest. This system continued to usher showers and thunderstorms over states stretching from the upper Mississippi Valley to southern New England. Flood warnings were issued in parts of southeast Minnesota, eastern Iowa, northeast Missouri and southern Michigan. Allentown, Pa., reported a midday total of 3.14 inches of rain. Mount Pocono, Pa., reported a midday total of 1.81 inches of rain. A cold frontal boundary associated with this system extended south southwestward from the central Appalachians to the Florida Peninsula. Heavy rain and thunderstorms fired up along and near this frontal boundary from the northern Mid-Atlantic to the Southeast. Salisbury, Md., reported a midday total of 2.46 inches of rain. Elkins, W. Va., reported a midday total of 1.82 inches of rain. Meanwhile, monsoonal thunderstorms persisted across parts of the Desert Southwest, the southern Rockies and the southern high Plains. Just to the north, a wave of low pressure generated several clusters of thunderstorms from the upper Intermountain West to the northern Plains.

 

Jim G. Munley, jr.
http://www.jimmunleywx.com



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