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1st-6thLow pressure system spinning on the coast of the Carolinas, pushed ample moisture onshore triggering heavy showers and thunderstorms across the Mid-Atlantic States. Rainfall totals associated with this system have been between half an inch to almost 5 inches, with the highest mid-day rainfall totals reported in Charlotte, North Carolina at 2.49 inches. In the central U.S., a low pressure system moved off the central Plains into the Mid-Mississippi Valley bringing heavy rain and strong winds to the region and parts of the Ohio, Tennessee, and Upper Mississippi Valleys. Heavy downpours and strong winds were associated with these storms, with a strong wind reports Tennessee and Illinois. To the west, a low pressure system over Montana pushed a cold front through the Northern Rockies and Northern Plains producing moderate to heavy showers. Wind gusts were reported between 30 to 70 mph. In addition, monsoon moisture in the Southwest triggered scattered showers over the Four Corners region and Central Rockies.


14th-20thThe heaviest precipitation fell in New England as a storm moved up the eastern seaboard and rotated into the Northeast. This storm carried a significant amount of moisture that once again dumped rain on New England as some cities received several additional inches of rain to go along with the drenching precipitation from the weekend. The cold front associated with this storm pushed through the Southeast and off the coast of the Carolinas, greeting the area with very welcomed cooler air.

Parts of the Midwest experienced active weather Wednesday as a weak cold front dropped southeastward through Iowa and Wisconsin toward northwestern Illinois. Showers and a few thunderstorms accompanied the front in parts of Minnesota, Wisconsin, and Iowa during the morning and afternoon hours. While some storms associated with this system had the potential to produce damaging wind and hail, no events were reported as of this afternoon. To the south, daytime heating kicked up more showers and thunderstorms in central Florida as a frontal boundary remained stationary across the Florida Panhandle, Mississippi, and southern Arkansas. Stronger storms in this region had the potential to produce damaging wind gusts.


21st-27thLow pressure over Ontario pushed a frontal boundary through the Great Lakes to the Central Plains. Showers and thunderstorms developed along and ahead of this front over the Northern Appalachians to the Central Plains. The highest mid-day rainfall totals were reported in Toledo, Ohio at 1.43 inches. However, high pressure brought mostly sunny and dry conditions for the Northern Plains and Northern Rockies. In the South, ample moisture pulled onshore, which triggering heavy showers and thunderstorms across the Lower Mississippi Valley and parts of the Tennessee Valley. Rainfall totals associated with these storms have ranged from 0.35 inches to almost 1.5 inches. In addition, strong winds were reported in several areas in Arkansas and Louisiana, with wind gusts recorded at 58 mph in Monroe, Louisiana.


28th-31stThe northern states saw plenty of active weather on Wednesday. A strong frontal system moved through the Northwest, which contributed to widespread moderate showers and thunderstorms over the Intermountain West and Northern Rockies. Wind gusts associated with this system ranged from 30 to 50 mph. At the same time, a large low pressure system positioned over Canada pushed moderate to light rain showers to the Upper Midwest, Great Lakes, and Northeast. Wind gust reached 51 mph in Mt. Washington, New Hampshire. To the south, ample available moisture pushed onshore, which triggered heavy showers and thunderstorms over most of Florida and along the coast of the Gulf States. Rainfall totals reached between 0.40 inches and 0.85 inches in Florida, with the highest mid-day rainfall totals recorded in Boothville, Louisiana at 1.11 inches. Meanwhile, an upper level ridge of high pressure over the Southeast produced mostly dry conditions for the South-Central US, and eastward to the Mid-Atlantic.

Most of the precipitation were tropical in nature, as Tropical Storm Irene’s departure from the Northeast was soon followed by Tropical Storm Lee’s arrival along the central Gulf Coast. In Irene’s wake, extensive flooding struck the interior Northeast. Later, more than 10 inches of rain drenched parts of the central Gulf Coast region, triggering local flooding. Lee made landfall in southern Louisiana on the morning of September 4. Farther north and west, a strong cold front sparked some heavy showers and thunderstorms from the northern and central Plains into the western Corn Belt. Early in the week, Irene continued to batter the Northeast. Despite being downgraded from a hurricane to a tropical storm before reaching New York City on the morning of August 28, wind gusts on that day were clocked to 81 mph at the Blue Hill Observatory in Milton, MA; 67 mph at New York’s LaGuardia Airport; 64 mph in Providence, RI; and 63 mph in Bridgeport, CT. Meanwhile, record setting rainfall amounts for August 28 reached 5.22 inches in Newark, NJ; 4.83 inches in St. Johnsbury, VT; 4.69 inches in Albany, NY; and 4.13 inches in Mt. Pocono, PA. Wilmington, DE (6.94 inches on August 27-28), experienced its fifth-highest 2-day rainfall on record. Record flooding affected numerous river basins from New Jersey northward. On August 28 in New Jersey, high-water marks from Hurricane Floyd in September 1999 were broken along the Millstone River at Griggstown (14.21 feet above flood stage) and Blackwells Mills (12.24 feet). Along the Passaic River at Pine Brook, NJ (5.12 feet above flood stage on August 30), the river level exceeded the high water mark established on October 10, 1903. In Vermont, Otter Creek at Rutland climbed 9.21 feet above flood stage on August 29, easily surpassing the record of 5.45 feet set in the aftermath of a hurricane on

September 22, 1938. In North Walpole, NH, the Connecticut River (3.36 feet above flood stage on August 29) climbed to its highest level since September 22, 1938.

Tropical Storm Lee made landfall on Sunday morning, September 4, near

Intracoastal City, LA. At landfall, Lee’s maximum sustained winds were near 45 mph, mostly in squalls over the northern Gulf of Mexico. On September 3, prior to Lee’s arrival, a few wind gusts to near 60 mph were reported in southern Louisiana as far inland as New Orleans. A gust to 51 mph was clocked on September 3 in Gulfport, MS. In addition, a 4-foot storm surge was noted in southern Louisiana locations such as Shell Beach and Lake Pontchartrain. However, Lee’s most significant impact was heavy rain. Official September 1-5 totals reached 11.64 inches in Mobile, AL; 11.15 inches in both Gulfport and Jackson, MS; 11.05 inches in New Orleans, LA; 9.80 inches in Chattanooga, TN; and 7.97 inches in Birmingham, AL. However, much of Lee’s heavy rain fell in drought-affected areas, helping to limit flood severity.


Jim G. Munley, jr.

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