Wikipedia

March 2021 North American blizzard

The March 2021 North American blizzard was a record-breaking blizzard in the Rocky Mountains and a significant snowstorm in the Upper Midwest that occurred in mid-March 2021. It brought Cheyenne, Wyoming their largest two-day snowfall on record, and Denver, Colorado their second-largest March snowfall on record. The storm originated from an extratropical cyclone in the northern Pacific Ocean in early March, arriving on the west coast of the United States by March 10. The storm moved into the Rocky Mountains on Saturday, March 13, dumping up to 2–3 feet (61–91 cm) of snow in some areas. It was unofficially given the name Winter Storm Xylia.[4][5]

March 2021 North American blizzard
NASA satellite imagery of the winter storm over the Central United States on March 1
Meteorological history
FormedMarch 4, 2021
DissipatedMarch 17, 2021
Category 3 "Major" winter storm
Regional Snowfall Index: 7.84 (NOAA)
Highest winds71 mph (114 km/h) in Douglas Pass, Colorado on March 15
Lowest pressure980 mbar (hPa); 28.94 inHg
Maximum snowfall or ice accretion52.5 in (133 cm) at Windy Peak, Laramie Range, Wyoming[1]
Tornado outbreak
Tornadoes21
Maximum ratingEF2 tornado
Duration6 hours, 43 minutes
Overall effects
FatalitiesNone reported
Damage>$75 million (2021 USD)[2]
Areas affectedPacific Northwest, Western United States, Rocky Mountains, Southern United States, Midwestern United States, New England
Power outages> 54,000[3]
Part of the 2020–21 North American winter and tornado outbreaks of 2021

Thousands lost power and several areas received some of their heaviest late-season snowfall on record. The system caused at least $75 million in damage, although no fatalities were reported.[2] The system was also responsible for a tornado outbreak in the Texas Panhandle on March 13, spawning 21 confirmed tornadoes. These tornadoes caused $1.285 million in damage.

Meteorological history

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On March 4, a new extratropical low formed over the north central Pacific, within a larger extratropical storm. The system quickly split off from the parent low, and over the next couple of days, the storm moved southeastward while gradually intensifying, before reaching a peak intensity of 980 millibars (29 inHg) on March 6.[6] Afterward, the storm stalled off the coast of the Pacific Northwest for the next couple of days, while weakening, with the storm shedding its frontal system and weakening to 1,000 millibars (30 inHg) by 09:00 UTC on March 8.[7][8] On the next day, the storm slowly began to approach the West Coast, while developing multiple central lows in the process.[9] On March 10, the storm began moving ashore in California, while developing a new low-pressure center to the east, which became the dominant low by the next day, after the storm had moved inland.[10][11][12] The storm remained nearly stationary over the Western United States for another day, before resuming its eastward motion on March 12, as a disorganized storm system.[13] On the next day, the storm began approaching another system over the Central Plains while gradually strengthening, before merging with it early on March 14, with the winter storm organizing significantly and growing more powerful in the process.[14][15] On the night of March 13–14, a powerful low-level jet stream channeled large amounts of moisture from the Gulf of Mexico across the Southern Plains and into the storm, which enhanced precipitation from the storm and also contributed to the strengthening of the system.[1] On March 14, the winter storm developed a secondary low at the triple point of its occluded front, as the storm expanded in size. Later that day, the storm's central pressure reached a secondary peak of 998 millibars (29.5 inHg), while the storm was situated over the Central United States, with the center of low pressure being situated over southeastern Colorado.[16][17] For much of that day, the storm's central low remained nearly stationary, even as it was intensifying. The storm's cyclogenesis resulted in a tightening of the pressure gradient, which gave the storm a large and expansive wind field.[1]

Afterward, the storm gradually began to weaken as it slowly moved eastward, even as it continued expanding in size. The storm's eastern flank continued moving farther apart from the parent low during this time.[18] From March 14 to 15, another extratropical cyclone moving in from the Pacific Northwest helped speed up the storm's eastward motion.[1] Throughout March 15, the winter storm weakened significantly, with the storm's western flank breaking off into a new storm over Northern United States, while the storm's secondary low to the east dissipated. The storm reached the Southeastern United States and the Mid-Atlantic region on March 16, even as the storm grew increasingly disorganized, with the storm's central pressure rising to 1,012 millibars (29.9 inHg) by 18:00 UTC that day.[19][20] On March 17, the majority of the moisture from the winter storm was absorbed into a new storm developing off the coast of the Carolinas, as the former storm's low-pressure center stalled over West Virginia. Later that day, the winter storm dissipated over West Virginia.[21][22]

Preparations

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Winter Storm Warnings and Blizzard Warnings were issued from March 12–13 in much of the Rocky Mountains, where the heaviest of the snowfall was expected to occur.

Rocky Mountains

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In Colorado, where the winter storm had the potential to be the biggest March snowstorm since 2003, officials urged residents to prepare ahead of the storm. On March 10, as the system was moving ashore in the West Coast, the Colorado Department of Transportation (CDOT) advised motorists to stay off the roads during the peak of the storm, due to potential whiteout and blizzard conditions being possible.[23] The city of Denver prepared to deploy snowplows ahead and during the storm to clear residential streets as needed. In addition, United Airlines offered waivers to flights expected to be impacted by the winter storm.[23]

Governor Mark Gordon of the state of Wyoming posted a warning on Twitter on March 13, advising residents to stay off the roads at all costs during the storm.[24] The Wyoming Department of Transportation (WYDOT) urged motorists to stay off the roads during the snow on March 12, and stated they were ready to deploy snow plows and materials to treat roadways.[25] Blizzard warnings were issued for parts of the state, including the city of Cheyenne, due to expected high wind gusts up to 50 mph (80 km/h) and heavy snowfall of up to 2 feet (24 in) expected. Blizzard warnings were later expanded southward along the Front Range to include Denver. In Sioux Falls, South Dakota, snow blew into traffic lights at intersections, making it impossible for drivers to tell if the lights were red, yellow or green.[26]

Southern Plains

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On the morning of March 13, the Storm Prediction Center issued a moderate risk severe weather outlook for the Texas Panhandle, noting the potential for strong tornadoes.[27]

Impact

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Rocky Mountains

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The storm brought Cheyenne their largest two-day snowfall on record, with 30.8 inches (78 cm) falling from March 13–14. The storm closed schools and colleges, as well as city and state government buildings.[26] Schools and government offices also shut down in Casper.[26] Denver received their second-largest March snowfall on record, with 27.1 inches (69 cm) falling at the airport.[28][26] The storm was also Denver's fourth-largest snowstorm on record.[28][5] The storm shut down major highways, caused blizzard conditions across the region, forced more than 2,000 flights to be canceled and forced all runways to be closed at Denver International Airport,[29] and left tens of thousands of people without power.[4][5] The Colorado Avalanche Information Center issued an avalanche warning for the Front Range area due to the heavy snow.[4] The Aurora Police Department in Colorado reported 25 to 30 vehicles were stranded on the E-470 toll road east of Denver.[26] Several interstate highways including Interstate 25, Interstate 70, Interstate 76 and Interstate 80 shut down.[3] Nearly 24,000 homes and businesses in Colorado remained without electricity on March 15.[26] The snowstorm also prevented the Los Angeles Kings to fly out of Denver, postponing a game against the St. Louis Blues.[30] Several school districts in South Dakota canceled classes due to the storm.[26] In Wyoming, schools in Laramie and Natrona counties announced they would be closed through the middle of the week as travel was nearly impossible.[31] The United States Postal Service also announced it is having difficulty delivering mail in some parts of Wyoming.[31] Outside of those two states, wind gusts reaching 69 mph (111 km/h) in Maeser, Utah.[3]

Midwest

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Wind gusts reached 63 mph (101 km/h) in Ord, Nebraska and 59 mph (95 km/h) in Grand Island, Nebraska.[3]

In Minnesota, the State Patrol said 264 crashes were reported, and 22 of those involved injuries.[31] At least 13 tractor-trailers jackknifed and 251 vehicles spun out on the slick roadways.[31]

Southern Plains

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Multiple tornadoes touched down across the Panhandle, mainly areas between Lubbock and Amarillo and points eastward. A large tornado prompted PDS tornado warnings for portions of Randall, Armstrong, and Carson counties.[32][33][34][35] After surveys, it was determined an EF2 tornado moved from southwest of Happy in Swisher County to east of Canyon in Randall County. As the tornado dissipated, a new tornado, rated EF1, formed and moved into Armstrong County, passing over Palo Duro Canyon. A third tornado was spawned just northeast of the second one, also crossing from Randall to Armstrong and lifting near Washburn, just before crossing into Carson County. Another EF2 tornado caused minor damage in Clarendon before strengthening and causing major damage near the Greenbelt Lake Reservoir.[36] The final tornado of the day was a EF2 tornado that touched down southwest of Ensign and caused minor damage including several sturdy wood electrical poles that were snapped.[37] Damage totaled $1.285 million.[38]

Confirmed tornadoes by Enhanced Fujita rating
EFU EF0 EF1 EF2 EF3 EF4 EF5 Total
10 4 4 3 0 0 0 21

Confirmed tornadoes

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List of confirmed tornadoes – Saturday, March 13, 2021[note 1]
EF# Location County / Parish State Start Coord. Time (UTC) Path length Max width Summary
EFU WSW of Nazareth Castro TX 34°31′36″N 102°09′02″W / 34.5267°N 102.1505°W / 34.5267; -102.1505 (Nazareth (March 13, EFU)) 20:55–20:57 0.92 mi (1.48 km) 20 yd (18 m) A brief tornado was observed by a trained spotter. No damage occurred.[39]
EF2 SW of Happy to ESE of Canyon Swisher, Randall TX 34°42′19″N 101°59′13″W / 34.7054°N 101.9869°W / 34.7054; -101.9869 (Happy (March 13, EF2)) 21:15–22:00 21.25 mi (34.20 km) 1,000 yd (910 m) Many electrical transmission lines were damaged, a cell phone tower was blown over, and power poles were snapped along the path of this large wedge tornado. Homes sustained significant roof damage, including one that lost a large section of its roof and had considerable damage to its exterior. Damage also occurred to outbuildings, trees, and fencing. The tornado spent much of its life cycle over mostly open land.[40][41][36][42][43]
EF1 NW of Happy Randall TX 34°48′04″N 101°54′41″W / 34.8012°N 101.9115°W / 34.8012; -101.9115 (Happy #1 (March 13, EF1)) 21:31–21:36 2.5 mi (4.0 km) 500 yd (460 m) This brief tornado was caught video by storm chasers and residents in the area. It was on the ground simultaneously with the EF2 tornado just to its south. A barn and power lines were damaged before the tornado was absorbed into the larger EF2 tornado.[44]
EF1 N of Happy Randall TX 34°48′59″N 101°51′27″W / 34.8163°N 101.8576°W / 34.8163; -101.8576 (Happy #2 (March 13, EF1)) 21:37–21:42 3.54 mi (5.70 km) 100 yd (91 m) This was a satellite tornado on the southern side of the main EF2 tornado. Radar and reports and video from storm chasers suggest this was also an anticyclonic tornado. A brief tornado debris signature was visible on doppler radar in association with this tornado as it snapped power poles along Interstate 27. No other damage occurred as this tornado tracked northeast and dissipated.[45]
EF1 E of Canyon Randall, Armstrong TX 34°58′35″N 101°43′39″W / 34.9765°N 101.7275°W / 34.9765; -101.7275 (Palo Duro Canyon (March 13, EF1)) 21:48–22:14 8.16 mi (13.13 km) 800 yd (730 m) This tornado was on the ground simultaneously with the Happy/Canyon EF2 tornado for several minutes as that tornado dissipated. Campgrounds were damaged at Palo Duro Canyon State Park. One cabin at the park lost its entire roof and travel trailers were flipped, including one which was destroyed. None of these trailers were anchored. Other damage at the state park including minor damage to weaker structures, and trees were damaged as well. The tornado became wider as it crossed Palo Duro Canyon. After crossing the canyon, the tornado traveled through a very rural area and lifted as another tornado formed in the vicinity.[40][36][46][47]
EF0 N of Hart Castro TX 34°25′25″N 102°06′48″W / 34.4236°N 102.1134°W / 34.4236; -102.1134 (Hart (March 13, EF0)) 21:54–21:56 1.42 mi (2.29 km) 30 yd (27 m) A brief tornado flipped an irrigation pivot and caused minor roof damage to a metal building. A Texas Tech West Texas mesonet station located north of Hart measured an 87 mph (140 km/h) wind gust as the tornado passed nearby.[48]
EFU SE of Nazareth Castro TX 34°31′29″N 102°04′11″W / 34.5248°N 102.0696°W / 34.5248; -102.0696 (Nazareth (March 13, EFU)) 21:55–21:57 0.3 mi (0.48 km) 30 yd (27 m) A brief tornado over open land was recorded on video and caused no damage.[49]
EF0 E of Happy Swisher, Randall TX 34°44′01″N 101°43′56″W / 34.7335°N 101.7323°W / 34.7335; -101.7323 (Happy (March 13, EF0)) 22:05–22:11 3.23 mi (5.20 km) 50 yd (46 m) This tornado was caught on camera by storm chasers. Two power poles were broken in Swisher County.[50][51]
EF0 NNE of Palo Duro Canyon to ESE of Washburn Randall, Armstrong TX 35°00′41″N 101°38′42″W / 35.0114°N 101.6449°W / 35.0114; -101.6449 (Washburn (March 13, EF0)) 22:06–22:34 12.96 mi (20.86 km) 1,000 yd (910 m) This tornado was on the ground simultaneously with the Palo Duro Canyon EF1 tornado for several minutes as that tornado dissipated. Power poles and several outbuildings were damaged. A semi-truck was pushed over before the tornado lifted after crossing U.S. Highway 287. The tornado occurred over mostly open land and was likely stronger than its rating indicates, but it impacted few structures.[52][53]
EFU ESE of Hale Center Hale TX 34°04′57″N 101°41′48″W / 34.0825°N 101.6966°W / 34.0825; -101.6966 (Hale Center (March 13, EFU)) 22:21 0.04 mi (0.064 km) 20 yd (18 m) A brief tornado was observed by storm spotters and caused no damage.[41][54]
EFU NNE of Aiken Floyd TX 34°14′00″N 101°29′16″W / 34.2333°N 101.4877°W / 34.2333; -101.4877 (Aiken (March 13, EFU)) 22:46 0.05 mi (0.080 km) 20 yd (18 m) A very brief tornado was photographed by a trained spotter. No damage occurred.[55]
EFU SW of Groom Armstrong TX 35°07′30″N 101°14′10″W / 35.1251°N 101.2360°W / 35.1251; -101.2360 (Groom (March 13, EFU)) 23:02–23:11 3.11 mi (5.01 km) 800 yd (730 m) The damage path of this tornado was inaccessible by road, and it was confirmed by radar and storm chasers.[56]
EFU SW of Silverton Briscoe TX 34°27′01″N 101°19′12″W / 34.4504°N 101.32°W / 34.4504; -101.32 (Silverton (March 13, EFU)) 23:08 0.06 mi (0.097 km) 20 yd (18 m) A brief tornado in an open field was observed and photographed by storm spotters and caused no damage.[57]
EF2 SSW of Clarendon to NE of Howardwick Donley TX 34°53′10″N 100°55′45″W / 34.8861°N 100.9292°W / 34.8861; -100.9292 (Howardwick (March 13, EF2)) 23:48–00:12 13.22 mi (21.28 km) 1,200 yd (1,100 m) A tornado moved into the southwest edge of Clarendon, causing minor damage to homes and to Clarendon College, with sheet metal torn off the building. The tornado widened as it moved towards and then across Greenbelt Reservoir and into Howardwick. Mobile homes, recreational vehicles, and boating facilities were heavily damaged. One mobile home was completely destroyed, with debris from the structure scattered. Power poles were snapped, and many trees were snapped along the path.[40][36][58]
EF0 Clarendon Donley TX 34°56′05″N 100°54′11″W / 34.9348°N 100.9031°W / 34.9348; -100.9031 (Clarendon (March 13, EF0)) 23:51–23:52 0.95 mi (1.53 km) 40 yd (37 m) Brief, rain-wrapped tornado damaged several homes and sheds in town. Around ten homes sustained shingle damage to roofs, and several trees were downed. This tornado occurred simultaneously with and just east of the Clarendon–Howardwick EF2 tornado.[40][36][59]
EFU E of Lazare Hardeman TX 34°16′48″N 99°57′54″W / 34.28°N 99.965°W / 34.28; -99.965 (Lazare (March 13, EFU)) 01:41 0.2 mi (0.32 km) 50 yd (46 m) A brief tornado was observed by trained spotters. No damage occurred.[60]
EFU N of Goodlett Hardeman TX 34°23′00″N 99°52′48″W / 34.3834°N 99.88°W / 34.3834; -99.88 (Goodlett (March 13, EFU)) 02:00 0.2 mi (0.32 km) 30 yd (27 m) A brief tornado was reported by a trained spotter. No damage occurred.[61]
EF0 WNW of Eldorado Jackson OK 34°29′24″N 99°46′13″W / 34.49°N 99.7704°W / 34.49; -99.7704 (Eldorado (March 13, EFU)) 02:15 0.2 mi (0.32 km) 30 yd (27 m) A brief tornado was reported by two trained spotters. No damage occurred.[62]
EFU S of McQueen Harmon OK 34°34′59″N 99°42′00″W / 34.583°N 99.70°W / 34.583; -99.70 (McQueen (March 13, EFU)) 02:29 0.2 mi (0.32 km) 20 yd (18 m) A brief tornado was observed by a trained spotter. No damage was reported, however, power flashes were observed with this tornado.[63]
EF1 S of Reed Greer OK 34°46′01″N 99°40′05″W / 34.767°N 99.668°W / 34.767; -99.668 (Reed (March 13, EF1)) 02:49–02:50 0.7 mi (1.1 km) 50 yd (46 m) A tornado developed near the community of Russell and moved to the north-northeast. One shed, two tractors, and the porch of a home were damaged at a farm. Two sheds were destroyed at another farm. Some debris was scattered for 1.5 mi (2.4 km).[64]
EF2 NNW of Fowler to WNW of Ensign Gray KS 37°29′55″N 100°16′31″W / 37.4986°N 100.2752°W / 37.4986; -100.2752 (Fowler (March 13, EF2)) 03:22–03:38 12.15 mi (19.55 km) 100 yd (91 m) Near the start of the path, the tornado overturned a pivot irrigation sprinkler. As the tornado moved north-northeast, it snapped eight sturdy power poles, and destroyed a small grain bin. Another pivot irrigation sprinkler was overturned before the tornado lifted. Some ground scouring was observed in farm fields along the path.[40][65]

See also

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Notes

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  1. ^ All dates are based on the local time zone where the tornado touched down; however, all times are in Coordinated Universal Time for consistency.

References

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