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Old December 26th 17, 04:23 PM posted to sci.geo.meteorology
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Default November 2017 National Weather Summary



1-4: Snow blanketed the far upper Midwest, while periods of rain occurred from the Ohio Valley into the lower Great Lakes region. In contrast, dry weather dominated the central and southern Plains and the lower Southeast. Dry weather also prevailed in the Southwest, accompanied by temperatures that averaged as much as 5 to 10°F above normal. Similar readings, 5 to 10°F above normal, were noted in New England. Across the South, a warming trend followed early-week freezes that ended the growing season in many areas north of a line from central Texas to the southern Appalachians. Elsewhere, cold, increasingly stormy weather engulfed the northern Plains and the Northwest. In fact, weekly temperatures averaged 5 to 15F below normal across the northern and central Plains and the upper Midwest. In early November, however, warmth returned to the south-central U.S. In fact, the warmest November day on record occurred on the 2nd in Texas locations such as Dallas-Fort Worth (94F) and Wichita Falls (90F). Neither location had ever attained a 90-degree reading in November; monthly record highs had been 89F in Dallas-Fort Worth, achieved most recently on November 5, 2005, and 89°F in Wichita Falls, set on November 9, 1988. With a high of 92F on November 2, Waco, TX, tied a monthly record previously set on November 4, 1948, and November 7, 1988. On November 3, daily-record highs soared to 88F in Shreveport, LA, and 87°F in Augusta, GA. Wichita Falls again reached 90F on November 4, while San Angelo, TX, closed the week with a trio of daily-record highs (92, 88, and 91F) from November 2-4. In stark contrast, Great Falls, MT, notched a daily-record low of -9F on November 4.

5-11: Cold but mostly dry weather across the Plains and upper Midwest. Cold but mostly dry weather across the Plains and upper Midwest, although generally dry weather prevailed along and near the Gulf Coast. Some of the precipitation fell as snow, especially from the Great Lakes region into the Northeast. Meanwhile, warm, dry weather in the Southwest contrasted with cool, stormy conditions in the Northwest. . In addition, beneficial precipitation spread southward across roughly the northern half of California. As a cold weather pattern became entrenched across the Northwest, Plains, Midwest, and Northeast, weekly temperatures averaged as much as 10 to 20°F below normal from Montana to Lake Superior. The extended early season cold wave across the northern U.S. resulted in sub-zero temperatures on multiple days from Montana into the upper Great Lakes region. Farther south, however, temperatures averaged 5 to 10F above normal in parts of Arizona and New Mexico and up to 5F above normal across the lower Southeast. High temperatures topped 90F in parts of northern Texas on November 5 and in Deep South Texas through November 7. In advance of a cold front, record-setting warmth continued across the South. Flippin, AR, posted a high of 85°F on November 5, tying a monthly record most recently attained on November 20, 1989.. Meanwhile in Texas, record-setting highs for November 5 included 95°F in McAllen; 94°F in Corpus Christi and Dallas Fort Worth; 92F in Brownsville; and 91F in San Antonio. Dallas-Fort Worth, which before 2017 had never reached the 90degree mark in November, posted monthly record highs of 94F on November 2 and 5. McAllen topped the 90-degree mark on each of the first 7 days of November, with the temperature peaking on the 5th. Corpus Christi experienced its hottest November day since November 4, 1988, when the high reached 98F. In stark contrast, Livingston, MT, collected consecutive daily-record lows (-6 and -3F, respectively) on November 6-7. Other record-setting lows in Montana for November 7 included -12F in Bozeman and -10F in Townsend. Stockton, CA, also noted a record-breaking low for November 7, dipping to 35F. By November 8, Cedar City, UT, reported a daily-record low of 13°F. The next surge of cold air took aim on the Midwest and Northeast. November 9-10 featured consecutive daily record lows (-13 and -14F, respectively) in International Falls, MN. In Michigan, a trio of daily-record lows were set from November 9-11 in Pellston (16, -5, and 5°F) and Gaylord (14, 1, and 11F). Similarly, three consecutive daily-record lows were established from November 10-12 at New York’s JFK Airport (25, 24, and 29F) and Trenton, NJ (23, 21, and 240F). Daily records were tied or broken on November 10 in cities such as Madison, WI (9F); Chicago, IL (18F); and Detroit, MI (19F). Subsequently, on November 11, daily records were tied or broken in Cleveland, OH (20F); Baltimore, MD (21F); and Washington, DC (26°F). Records were established on both November 10 and 11 in locations such as Pittsburgh, PA (20 and 17F); Boston, MA (24 and 23F); and New York’s Central Park (25 and 240F).

12-18: Mild, dry weather dominated the remainder of the country, including the Plains, Deep South, Desert Southwest, and southern California. In particular, late-season warmth on the central and southern Plains further reduced topsoil moisture, but promoted winter wheat development in less-dry areas. Weekly temperatures averaged at least 10F above normal in numerous locations from Arizona to Texas. Readings averaged more than 5F above normal in a much larger area stretching as far north as Wyoming and southwestern South Dakota. In contrast, chilly conditions dominated the eastern U.S., as well as the Great Lakes region. Temperatures averaged as much as 5F below normal in the Atlantic Coast States from South Carolina to Maine. Additionally, cold weather lingered near the Canadian border in Montana and North Dakota. The week began on November 12 with a third consecutive daily record low in Northeastern locations such as Trenton, NJ (24F), and New York’s JFK Airport (29F). Meanwhile, record-setting warmth continued or developed across the southwestern and south-central U.S. In Arizona, Tucson reported highs of 85F or greater on 9 consecutive days from November 9-17. Tucson also achieved daily-record highs of 88 and 89F, respectively, on November 13 and 16. Warmth briefly surged northward across the High Plains on November 16, when daily-record highs were set in Nebraska locations such as Chadron (78F) and Scottsbluff (77F). In Texas, record-setting highs for November 17 included 92F in Childress; 89F in Midland; and 88F in San Angelo. Hobart, OK (92F), and Roswell, NM (89°F), also registered daily-record highs for November 17. Houston, TX, closed the week with consecutive daily-record highs (86 and 84F, respectively) on November 17-18. Elsewhere in Texas, record breaking highs for the 18th soared to 90°F in Corpus Christi and 88F in Victoria and San Antonio.

19-15: Dry weather dominated the country, except along the Atlantic Seaboard, downwind of the Great Lakes, and in the Northwest. Across vast sections of the nation, stretching from the Southwest to the Plains, Midwest, mid-South, and much of the Southeast. Southern California and the Southwest continued to await seasonal rainfall, which has not yet materialized in part due to the influence of the developing La Nina on North American weather patterns. Significant precipitation was confined to the Northwest. Weekly totals of 4 to 12 inches, with locally higher amounts, were reported from the Cascades westward, with unusual warmth restricting Northwestern snow accumulations to the highest elevations. Late-season warmth across much of the western and central U.S. contrasted with chilly conditions from the Ohio Valley southward to the Gulf Coast. Weekly temperatures generally ranged from 5 to 15F above normal from the Pacific Coast to the Plains and westernmost Midwest, but averaged at least 5F below normal in the central Gulf Coast States, the Tennessee Valley, and portions of the southern Mid-Atlantic region. From November 22-24, record-setting warmth broadly covered the western and central U.S. Temperatures soared to 80F or higher as far north as the central Plains and topped 70F in eastern Montana. Readings above 90F were noted in parts of southern California and southwestern Arizona. Cool air settled across the South and East in the wake of a cold front’s passage. By November 22, daily-record lows were noted in locations such as Joplin, MO (19°F), and Ponca City, OK (20F). The following day, lows of 27F in Alexandria, LA, and Stuttgart, AR, set records for November 23. In contrast, record-setting warmth appeared across the West on November 21, later spreading to the nation’s mid-section. The warm spell began on November 21-22 with consecutive daily-record highs in locations such as Medford, OR (70 and 72°F), and Bellingham, WA (60 and 68F). At mid-week, heat arrived in southern California. With a high of 99°F on November 22, Camarillo achieved a monthly record high (previously, 98°F on November 5, 2012). Elsewhere in California on the 22nd, daily-record highs topped the 90-degree mark in locations such as Palm Springs (96F), Santa Ana (96F), Riverside (95F), and San Diego (92F). Thanksgiving Day, November 23, featured daily-record highs in dozens of locations, including Yuma, AZ (91F); Las Vegas, NV (80F); Pueblo, CO (76F); Valentine, NE (76F); Rapid City, SD (75F); Sheridan, WY (74F); and Glasgow, MT (73F). In North Dakota locations such as Bismarck (74F), Dickinson (70F), and Williston (67F), it was the warmest Thanksgiving Day on record. Previous records had been 62F (on November 28, 2002) in Bismarck; 65F (on November 26, 1998) in Dickinson; and 56F (on November 28, 2002) in Williston. With a high of 67F on November 23, Albuquerque, NM, tied a Thanksgiving Day record originally set on November 24, 1949. The parade of daily-record highs continued through November 24, when temperatures soared to 87F in Salina, KS; 85F in Childress, TX; 84F in Roswell, NM; and 82F in Ponca City, OK, and Pueblo, CO. Sioux City, IA, registered consecutive daily-record highs (63 and 68F, respectively) on November 23-24. Elsewhere on the 24th, Yuma, AZ, notched a second consecutive daily-record high, reaching 90F. By November 25, record setting warmth temporarily retreated into the West, where daily-record highs included 91°F in Campo, CA; 88F in Tucson, AZ; and 70F in Cedar City, UT. In fact, both Tucson (89, 88, 88, 92, and 92F from November 23-27) and Cedar City (69, 71, 73, 70, and 73F from November 22-26) tallied five consecutive daily-record highs.

26-30: Nearly all other areas, including the Plains, Midwest, Southwest, and East, received little or no precipitation. Across a vast area stretching from the Southwest into the middle and lower Mississippi Valley, as well as portions of the Atlantic Coast States remained dry. In addition, warmth covered much of the country, with near-normal temperatures limited to the Northeastern and Mid-Atlantic States and areas along the Pacific Coast. Weekly temperatures averaged at least 10F above normal across large sections of the Plains, Southwest, and upper Midwest. In the South and East, mild weather replaced previously cool conditions. The driest autumn on record came to a close on November 30 across portions of the southern U.S. September-November precipitation totaled just 0.43 inch (7 percent of normal) in Flagstaff, AZ, and 2.01 inches (16 percent) in Pine Bluff, AR—setting autumn records in both locations. In addition, records for November dryness were set in Southern locations such as New Orleans, LA (0.06 inch; previously, 0.21 inch in 1949), and Vichy-Rolla, MO (0.27 inch; previously, 0.28 inch in 1949). Meanwhile, late-November precipitation was mostly confined to the Northwest, where daily-record totals in Idaho on the 27th reached 0.32 inches in Jerome and 0.24 inch in Burley. In the Sierra Nevada, where early-week precipitation included high-elevation snow, winds on November 26 were clocked to 126 mph on Peavine Peak in Washoe County, NV, and 116 mph at Alpine Meadows (summit) in Placer County, CA. In Montana, Great Falls, reported wind gusts to 40 mph or greater on 14 November days, twice the monthly normal and the most in November at that location since 1990. Great Falls’ highest gust during the month was 59 mph on November 26.

Late-November warmth continued to set temperature records early in the week.. With a high of 90F on November 26, Yuma, AZ, experienced its latest-ever reading of 90F or greater. Previously, Yuma had never reached 90°F after November 25—a record that had been set in 1950. Similarly, Valentine, NE, posted a high of 84F on November 27. Previously, Valentine’s latest 80-degree reading had occurred on November 16, 1941, with a high of 82F. On November 26-27, consecutive daily-record highs were set in locations such as Tucson, AZ (92F both days); Goodland, KS (77 and 82°F); Pueblo, CO (77 and 82F); Salt Lake City, UT (69 and 67F); and Helena, MT (66 and 61F). Salt Lake City also completed its warmest November on record, with the average temperature of 47.8F (7.8F above normal), eclipsing the 2016 standard of 47.0F. Record setting warmth spread into the western Midwest on November 27, when daily-record highs climbed to 74F in Kennebec, SD, and 72F in Lincoln, NE. On November 28, Midwestern daily-record highs included 68F in Lincoln, IL, and 66F in Flint, MI. By week’s end, however, slightly cooler air arrived in the central and eastern U.S., while record-setting warmth returned to parts of the West. On December 2, daily-record highs were set in Western locations such as St. George, UT (70F), and Grand Junction, CO (60F).

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