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NATIONAL STORM SUMMARY
1-9: Heavy rain and strong thunderstorms developed along and near this frontal boundary, especially across the Deep South. Flash flood warnings were issued for southern Alabama. Widespread flood warnings were also issued across the lower Mississippi Valley and the Gulf Coast. Macon, Ga., reported a midday total of 4.92 inches of rain. Macon, Ala., reported a midday total of 3.02 inches of rain. In addition, tornado watches were issued in southern South Carolina, Georgia, southern Alabama and the Florida Panhandle.
10-16: Low pressure system over the southern Rockies advanced eastward and pulled in abundant moisture from the Gulf of Mexico. This triggered scattered showers across the Four Corners with thunderstorm activity across southern New Mexico and into northern Texas. The northern side of this system allowed for scattered showers to develop across Idaho, western Montana, and Wyoming. Central and southern Texas remained under a slight and marginal chance for severe thunderstorm activity with large hail and strong winds as the main threats. Severe storms have not yet developed in this region.
17-23: A low pressure system produced a wet weather pattern across the Plains on Monday, while areas west of the Continental Divide experienced dry conditions. A slow moving low pressure system brought major impacts to the Plains and the western Gulf Coast. Multiple clusters of rain and thunderstorms trekked across the central and southern Plains. Flood warnings and flash flood warnings were issued for southeast Texas. Flood warnings were also issued for northern Texas, southeast Oklahoma and parts of Louisiana. La Grange, Texas, reported a midday total of 10.43 inches of rain. Barksdale Air Force Base, La., reported a midday total of 3.64 inches of rain. This system also ushered a mixture of rain and snow across the northern Plains, the central high Plains and the Rockies. Winter weather advisories were issued for northeast New Mexico, western Colorado, northern Wyoming and southeast Montana. Pagosa Springs, Colo., reported a midday total of 5.0 inches of snow.
24-30: Several storm systems traversed the U.S., leading to a showery, unsettled weather regime across most of the country. An atmospheric blocking pattern, featuring high pressure over Canada, kept the storms moving slowly but steadily on a west to east path. Some of the heaviest rain, 2 to 4 inches or more, fell from the eastern Plains into the mid-South and the southern and western Plains, erasing concerns about short-term dryness but causing local flooding. Locally severe storms, featuring wind, hail, and isolated tornadoes, accompanied the rain. Significant precipitation, including high-elevation snow, also fell from the Great Basin to the central Rockies.
Early in the week, record-setting rainfall spread eastward across the nation’s northern tier. Record-breaking totals for April 24 reached 2.91 inches in Miles City, MT, and 1.50 inches in
Casper, WY. For Miles City, it was also the wettest day (in any month) and April day on record—previous standards had been 2.71 inches on June 18, 1964, and 2.06 inches on April 27, 1989, respectively. For Casper, it was the fourth-wettest April day behind 2.80 inches on April 13, 1941; 1.82 inches on April 20, 1974; and 1.57 inches on April 2, 1964. Elsewhere in Wyoming, daily-record amounts for April 24 included 1.71 inches in Sheridan and 1.42 inches in Buffalo. The following day, record-setting amounts for April 25 in Michigan totaled 1.05 inches in Marquette and 0.96 inch in Gaylord. In Montana, daily-record snowfall totals for April 25 reached 2.0 inches in Havre and 1.7 inches in Glasgow. By April 26, separate areas of snow blanketed New England and the northern Intermountain West. In the former region, daily-record snowfall amounts for the 26th included 2.2 inches in Portland, ME, and 2.1 inches in Burlington, VT. On the same date, daily-record snowfall amounts in Wyoming climbed to 9.9 inches in Casper and 3.6 inches in Riverton. From April 24-30, Casper’s precipitation totaled 3.29 inches, including 11.8 inches of snow. Meanwhile, several waves of rain swept across the Plains, Midwest, and mid-South. On April 26, daily-record rainfall totals in Missouri climbed to 3.65 inches in Kansas City and 3.05 inches in St. Joseph. April 27 featured record setting rainfall amounts in South Dakota locations such as Mitchell (2.32 inches) and Huron (2.09 inches). In late April, another round of precipitation emerged from the West. In Little Rock, AR, April 29-30 rainfall reached 5.59 inches. On the same dates, precipitation in Denver, CO, totaled 0.88 inch, including 3.5 inches of snow.
North Platte, NE, collected a daily-record snowfall of 2.3 inches on April 30. Elsewhere in Nebraska, Kearney completed its wettest April on record, with 8.39 inches (previously, 7.59 inches in 1944). The last day of April featured daily-record amounts in locations such as Lake Charles, LA (3.34 inches), and Sioux City, IA (1.59 inches). Meanwhile, Las Vegas, NV (0.93 inch on April 30), reported its second-wettest April day behind 0.97 inch on April 12, 1965—capping its second-wettest April (2.26 inches) trailing only 2.44 inches in 1965. In Arizona, it became the wettest April 30 on record in locations such as Prescott (0.40 inch) and Winslow (0.34 inch). In contrast, no measurable precipitation fell in Caribou, ME, from April 13 – May 1, becoming the longest dry spell in that location since March 1-20, 2010.
Jim G. Munley, jr.
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