NATIONAL WEATHER SUMMARY
SEPTEMBER 2021
Aug. 29-Sep. 4: Hurricane Ida cut a destructive swath from the central Gulf Coast region into the Northeast, spending parts of 5 days (August 29 – September 2) inland. Initially, primary hurricane impacts included high winds and a coastal storm surge,
which resulted in extensive damage and power outages across southeastern Louisiana. Once inland, the focus turned to freshwater flooding and heavy rain, which totaled 4 inches or more in eastern Louisiana and parts of Alabama, Mississippi, and western
Florida.

In contrast, mostly dry covered the remainder of the country, including the northern Rockies, Far West, upper Great Lakes region, and much of Texas. Weekly temperatures averaged at least 5°F above normal across large sections of the central and southern
Plains, promoting summer crop maturation. Elsewhere, nearnormal temperatures prevailed in the Southwest and most areas east of the Mississippi River, while cool air held temperatures as much as 5°F below normal in the Northwest. Late in the week, cooler
air spread into the South, although heat and humidity lingered along and near the Gulf Coast. Brief heat in the Far West was knocked down following a cold front’s passage. On August 30, daily-record highs in California’s San Joaquin Valley soared to
108°F in Merced and Madera. Meanwhile, strong thunderstorms sweeping across Montana resulted in a wind gust to 79 mph (on August 30) at Bozeman Airport—a record for that location. Previously, Bozeman’s highest gust (78 mph) had occurred during a
thunderstorm on July 30, 1957. Although cooler air soon overspread much of the West, heat persisted across the Deep South. In Texas, daily-record highs included 97°F (on August 30) in Galveston and 105°F (on August 31) in Del Rio. Early to mid-week
heat also extended northward across the Plains, where Burlington, CO, posted a daily-record high of 100°F on the last day of August. Meanwhile, New Orleans, LA, endured temperatures ranging from 76 to 93°F during August 30 – September 5, the 7 days
after Hurricane Ida hit, amid widespread power outages. In Florida, daily-record highs of the first day of September reached 96°F in Miami and 95°F in Vero Beach. Late in the week, cooler air settling into the Southeast and Northwest resulted in
several dailyrecord lows. In Oregon, record-setting lows for September 3 dipped to 27°F in Burns and 32°F in Klamath Falls. The following day in Georgia, lows of 54°F in Augusta and 56°F in Macon were records for September 4.

5-11: Hot, dry weather soon returned across the West, limiting the overall impact of the precipitation. In fact, weekly temperatures broadly averaged at least 5°F above normal across the western half of the country—and up to 10°F above normal in
parts of California, the Rockies, and the Great Basin. Meanwhile, temperatures averaged as much as 5°F below normal across portions of the interior Southeast, particularly in the Tennessee Valley. Late-summer heat gripped much of the central and western
U.S., boosting temperatures to 100°F or higher as far north as California’s Central Valley and the central High Plains. However, the week had begun on a cool note across parts of the Intermountain West, where Randolph, UT, posted a daily-record low of
23°F on September 5. The parade of Western high-temperature records began on September 6, with highs of 104°F in Gilroy, CA, and 96°F in Reno, NV. Reno logged another daily-record high (98°F) on September 7. Elsewhere in Nevada, Winnemucca registered
daily-record highs each day (98, 99, 99, and 101°F) from September 6-9. Death Valley, CA, collected consecutive daily-record highs (122 and 120°F, respectively) on September 7-8. In New Mexico, Farmington tallied five consecutive daily-record highs (95,
96, 94, 91, and 91°F) from September 7-11. With a high of 106°F on the 10th, Borger, TX, edged the monthly record of 105°F, originally set on September 5, 1995. A monthly record of 89°F was tied on September 10 in Alamosa, CO. Alamosa again reached
89°F on September 11, tying the record first set on September 5 and 6, 2020, while Colorado Springs, CO, achieved a new September standard (98°F; previously, 97°F on September 6, 2020). Across the High Plains, the week ended on September 10-11 with
consecutive triple-digit, daily-record highs in communities such as McCook, NE (102 and 104°F); Goodland, KS (103 and 102°F); and Burlington, CO (101 and 100°F). Dodge City, KS (105°F on the 11th), achieved a 105-degree reading in September for only
the third time on record, following 106°F on September 3, 1947, and 107°F on September 1, 2011. Heat also lingered across the Deep South, where Del Rio, TX, noted highs of 100°F or greater on each of the first 10 days in September. Del Rio also
reported several daily-record highs, including a reading of 105°F on September 8.

12-18: Scattered showers dotted the nation’s northern tier, from the upper Midwest into the Northeast. The remainder of the nation was dry.

Late in the week, precipitation began to overspread the Northwest, aiding wildfire containment efforts and providing limited drought relief. Mostly dry weather continued, however, across the nation’s southwestern quadrant, including central and
southern California. Near- or above-normal temperatures across most of the country favored summer crop maturation, while pockets of cooler-than-normal conditions were generally limited to the Southeast, Northwest, and upper Great Lakes region. Weekly
temperatures broadly averaged at least 5°F above normal from the Great Basin and the Four Corners region into the mid-Atlantic and southern New England, encompassing the central Plains and lower Midwest. Readings averaged as much as 10°F above normal
in the eastern Corn Belt and mid-Atlantic. Some of the coolest weather, relative to normal, occurred in Washington. Heat briefly retreated into the South before returning northward. Borger, TX, posted a daily-record high of 99°F on September 12, down
slightly from its monthly record high of 106°F set 2 days earlier. Meanwhile in Florida, early-week records included 95°F (on September 13) in Tampa and 94°F (on September 12) in Fort Myers. During the second half of the week, scattered daily-record
highs dotted the Plains, where September 16 readings rose to 97°F in Pueblo, CO, and Imperial, NE. The following day, record-setting highs for September 17 surged to 103°F in Del Rio, TX, and 101°F in Roswell, NM. On September 18, the week ended with
a flurry of daily-record highs, as summer-like heat developed in advance of a cold front. On that date, Glasgow, MT, reported a daily-record high of 99°F. Other record-breaking highs for the 18th included 99°F in San Antonio, TX; 98°F in Chadron, NE;
and 96°F in Dickinson, ND. In contrast, cooler air settling across the Northwest resulted in a daily-record low (37°F on September 16) in Hillsboro, OR.

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