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MESONET TICKER ... MESONET TICKER ... MESONET TICKER ... MESONET TICKER ... March 1, 2021 March 1, 2021 March 1, 2021 March 1, 2021 A February to not remember http://ticker.mesonet.org/archive/20210301/feb2021.graph.png Hey now, I had to relive February to write that summary below, so why shouldn't you have to as well? Okay, if you don't want to, forget the graphic above, and don't skip to below the break. However, if you do skip, you'll miss out on all sorts of fantastical and wonderful tidbits, like it was cold, and it was really cold, and cold stinks, and so does snow, and I wish it was summer, etc. etc. As for this week, expect mild (i.e., blessedly boring) conditions with a chance of rain today in southern OK and another chance Thursday into Friday. The forecast rain totals are reversed from what we've seen recently, with the highest amounts in the far northwest. http://ticker.mesonet.org/archive/20210301/nws-norman-7day-temps.png http://ticker.mesonet.org/archive/20210301/7day-precip-outlook.gif And now, back to February for a recap of all its nastiness. We could concentrate on the positives in February? Okay, I'll list them off here: It was 81 degrees on Feb. 23. What, you're still here? ---------------------------------------------------------------------------------- Historically Frigid February Punctuates Winter March 1, 2021 Oklahoma experienced a historic cold air event during February, boosting the month into the company of other legendary frozen periods from calendar pages long torn away and discarded. February 1895, February 1899, and January 1930 all suffered through exceedingly long cold spells. More recently, December 1983 still lives in the minds of many Oklahomans as the bellwether of cold months, which followed those winters of the late 1970s when bone-chilling cold was simply a way of life; but those cold times were more than 37 years ago. Even February 2011 and its all-time state record low temperature of minus 31 degrees at Nowata, and all-time low wind chill of minus 47 degrees at Medford, still managed to finish only 2 degrees below normal. All the more shocking then to see the return of a generational winter blast, complete with ice, snow, and plenty of misery. A seasonable first few days of February soon gave way to a preliminary blast of Arctic air on Feb. 7, dropping temperatures across the state into the 20s and 30s. Several rounds of freezing drizzle provided treacherous travel conditions across the state. Temperatures continued to plummet over the next 7-10 days, culminating with historically cold air Feb. 14-16. The statewide average temperature on Feb. 15 was minus 0.7 degrees, more than 40 degrees below normal and the single coldest day statewide since at least 1915. Sparse station coverage prior to 1915 prevented accurate statewide estimates for comparison. The previous record coldest day was Dec. 22, 1989, with an average of 1.9 degrees. Feb. 15-16 and Feb. 14-16 also set records as the coldest 2-day and 3-day periods at -0.1 degrees and 2.1 degrees, respectively. Lowest minimum and maximum temperature records fell throughout the state over those days. The records for 4-day through 7-day periods were all set in Dec. 1983. http://ticker.mesonet.org/archive/20210301/feb14.lows.png http://ticker.mesonet.org/archive/20210301/feb14.highs.png http://ticker.mesonet.org/archive/20210301/feb15-lows.png http://ticker.mesonet.org/archive/20210301/feb15-highs.png http://ticker.mesonet.org/archive/20210301/feb16-lows.png http://ticker.mesonet.org/archive/20210301/feb16-highs.png Unlike many of the state’s garden variety cold spells, this event extended to Oklahoma’s southern border and beyond. Ninety-six of the Mesonet’s 120 sites recorded their all-time record low temperature on either Feb. 15 or Feb. 16. Mesonet temperature data go back to 1997. http://ticker.mesonet.org/archive/20210301/2021_cold_outbreak_records.png Overnight on Feb. 16, all 120 Mesonet sites were below zero for the first time in its history. http://ticker.mesonet.org/archive/20210301/all-below-zero.jpg The Mesonet site at Broken Bow reached a low of minus 9 degrees on Feb. 16, topping the town’s previous all-time record low of minus 5 degrees set at the National Weather Service’s (NWS) cooperative observer site on both Jan. 12 and Jan. 22, 1918. The cooperative site at Idabel reached a low of minus 12 degrees the morning of the 16th, breaking the previous all-time record low of minus 11 degrees from Feb. 2, 1951. Healdton’s minus 17 degrees from the 16th now tops all its record lows dating back to 1894. Oklahoma City’s minus 14 degrees on Feb. 16 was its second lowest temperature on record behind minus 17 degrees from Feb. 12, 1899. Tulsa’s minus 14 degrees, also on the 16th, is its fourth lowest temperature dating back to 1905, with a top mark of minus 16 degrees from Jan. 22, 1930. At least eight long-term NWS sites with periods of record of more than 70 years broke their all-time record lows during the event. Even the high temperatures were extraordinarily cold, at times below the record daily low temperatures. Billings and Medford both recorded high temperatures of 1 degree—Billings on the 16th and Medford on the 15th—which would have broken the previous record *low* temperatures for the day at those locations. That feat was repeated across the state numerous times between Feb. 14 and Feb. 16. The Oklahoma Mesonet’s 120 stations recorded wind chill values of minus 10 degrees or lower 439 times between Feb. 12 and Feb. 19, bottoming out at minus 36 degrees at Boise City on the 15th. The state’s all-time record lowest wind chill is minus 47 degrees on Feb. 10, 2011, at Medford. There were 38 wind chills of less than minus 30 degrees, and 251 less than minus 20 degrees. Temperatures slowly climbed back to something akin to seasonable by Feb. 20 when every site in the state broke the freezing barrier, many for the first time since Feb. 7. That 13-day span matches what many locations experienced in the deep freeze of December 1983. The Mesonet site at Lahoma spent the most time under the freezing mark at 334 hours from the afternoon of Feb. 6 through the afternoon of Feb. 20. Even locations in far southeastern Oklahoma spent over 200 hours below freezing during that time. http://ticker.mesonet.org/archive/20210301/feb14-low-wind.chills.png http://ticker.mesonet.org/archive/20210301/feb15-low-wind.chills.png http://ticker.mesonet.org/archive/20210222/total-freeze-hours.png Another key similarity to past extreme cold events was an abundance of frozen precipitation. Snow shovels were still busy clearing sidewalks and driveways after the first storm over Feb. 14-15 when the second storm hit on Feb. 16-17. Between the two snowfalls, totals of 5-15 inches were common across the main body of the state, with a bit less in the far northwest and the Panhandle. The NWS cooperative observer at Roosevelt in southwestern Oklahoma led the state with an official report 17 inches of snow, although unofficial reports of higher totals were scattered around. Strong winds gusting to over 40 mph pushed the dry snow into piles several feet high, drifting roads shut and creating hazardous driving conditions. http://ticker.mesonet.org/archive/20210301/nws-norman-feb14-17-snow-totals.png http://ticker.mesonet.org/archive/20210301/nws-shreve-14-17-snow-totals.jpg http://ticker.mesonet.org/archive/20210301/tulsa-feb16.17-snow.jpg The frosty 2-week span took a tremendous toll on Oklahoma. A state of emergency was declared by Gov. Kevin Stitt on Feb. 12 for all 77 Oklahoma counties, and President Joe Biden declared all 77 counties as federal disaster areas on Feb. 18 at the request of Gov. Stitt. The Oklahoma Department of Emergency Management and Homeland Security (ODEMHS) reported a total of 750 weather-related injures, with 538 of those being due to slips or falls. The cold placed immense strain on the region’s power suppliers and infrastructure, forcing rolling blackouts of electricity and cutbacks in gas service. The extended freezing weather damaged more than 120 public water systems according to ODEMHS, and many residences and business across the state faced frozen and burst pipes. The damage to agriculture was still being assessed, including harm to winter crops and livestock. The statewide average temperature for the month was 31 degrees according to preliminary data from the Oklahoma Mesonet, the sixth coldest February on record and an astounding 11.1 degrees below normal. The record belongs to February 1905 at 27.6 degrees. February was also the 20th coldest of any calendar month out of a possible 1513 months dating back to 1895, well short of January 1940’s record lowest of 23.7 degrees. The lowest temperature of the month was minus 22 degrees, recorded at Kenton on Feb. 15 and Nowata on Feb. 16. Those are the lowest reported temperatures in Oklahoma since Nowata set the all-time record low of minus 31 degrees on Feb. 10, 2011. The state’s highest temperature of 81 degrees came at Waurika on Feb. 23. Despite warmer than normal weather for December and January, the climatological winter (December-February) finished 2 degrees below normal at 37.4 degrees statewide, the 29th coolest winter on record. http://ticker.mesonet.org/archive/20210301/feb-avg-temps.png http://ticker.mesonet.org/archive/20210301/feb-temps-departure.png http://ticker.mesonet.org/archive/20210301/winter-avg-temps.png http://ticker.mesonet.org/archive/20210301/winter-temps-departure.png The heavy snows were unfortunately light on moisture. Rains on February’s final two days helped to lessen deficits that had built during the month, but every section of the state finished below normal. The statewide average for the month finished at 0.78 inches, 1.05 inches below normal and ranked as the 27th driest February on record. Broken Bow led the state with 4.22 inches of rain. Totals dropped quickly to the northwest, however, with much of northern and western Oklahoma seeing less than a third of an inch of liquid moisture. Buffalo had a paltry 0.04 inches for the month. Eighty-six of the Mesonet’s 120 sites recorded less than an inch of rain for the month, and 54 recorded less than a half-inch. Deficits ranged from less than a half-inch in the Panhandle to 1-2 inches over the main body of the state. The winter in its entirety fared a bit better with a statewide average of 5.23 inches, 0.22 inches below normal, to rank as the 51st wettest on record. http://ticker.mesonet.org/archive/20210301/feb-rain-totals.png http://ticker.mesonet.org/archive/20210301/feb-rain-departure.png http://ticker.mesonet.org/archive/20210301/feb-rain-pct.png http://ticker.mesonet.org/archive/20210301/season-rain-totals.png http://ticker.mesonet.org/archive/20210301/winter-rain-departure.png http://ticker.mesonet.org/archive/20210301/season-rain-pct.png Drought was mostly unchanged during February, given the frigid conditions. Continued dry weather forced intensification across south central and southeastern Oklahoma, however, with a new area of moderate drought indicated in those areas on the month’s final U.S. Drought Monitor map. Only 15% of the state remained in drought at the end of February. The March outlooks from the Climate Prediction Center (CPC) show increased odds of above normal temperatures across the entire state—but especially southwestern Oklahoma—and below normal precipitation over the western two-thirds of the state. Those odds for drier weather are greater across the western one-third, but especially the western Panhandle. CPC’s drought outlook showed no changes to the drought depiction are expected through March. http://ticker.mesonet.org/archive/20210301/jan26-drought.monitor.png http://ticker.mesonet.org/archive/20210301/feb23-drought.monitor.png http://ticker.mesonet.org/archive/20210301/march-temp-outlook.gif http://ticker.mesonet.org/archive/20210301/march-precip-outlook.gif http://ticker.mesonet.org/archive/20210301/march-drought-outlook.png Gary McManus State Climatologist Oklahoma Mesonet Oklahoma Climatological Survey (405) 325-2253 gmcmanus@mesonet.org
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