April 11, 2011
US Had Above Normal Temps. Precipitation In March
Last month, temperatures and precipitation in the contiguous United States averaged above normal, according to scientists at NOAA's National Climatic Data Center in Asheville, N.C. The average temperature in March was 44.0 degrees F, which is 1.4 degrees F above the long-term (1901-2000) average. March precipitation, while record dry in areas like Texas, was overall 0.22 inch above the long-term average. The January "“ March temperatures were near-normal, while average precipitation was below-normal.
This monthly analysis, based on records dating back to 1895, is part of the suite of climate services NOAA provides.U.S. climate highlights "“ March
- Above-normal warmth dominated much of the southern U.S. and Rocky Mountains. The largest temperature departures were in Western Texas and New Mexico, which had its fifth-warmest March on record. Midland, Texas had four consecutive days"”March 16 "“ 19"”of temperatures that tied existing records.
- Cooler-than-normal temperatures were present in the northern and western areas of the country. Conditions were especially cool from southwestern Minnesota across the Dakotas into eastern Montana. Within this belt, March temperatures were as much as 6 degrees below the 20th Century average.
- Precipitation varied across the country, as the west and east coasts received above normal amounts, while the central and southern United States was largely dry. Texas had its driest March on record, with a statewide average of 0.27 inch. This was 1.47 inch below its 20th Century average, and broke the previous record of 0.28 inch set in 1971. It was the third driest March in New Mexico and 10th driest in Oklahoma.
- Record warm maximum temperatures exceeded record cold minimum temperatures by a 5-to-1 ratio.
- Washington, Oregon and California had their second, fifth, and ninth wettest March on record, respectively. Regionally, it was the second wettest March on record for the Northwest. In the Northeast, Pennsylvania had its third wettest such period.
- Drought conditions continued to intensify across much of the nation in March. According to the U.S. Drought Monitor, the overall footprint of drought did not increase, holding fairly steady at about 24 percent of the country. However, the area covered by the "Severe" and "Intense" drought categories almost doubled, from about 12 percent early in the month, to more than 20 percent at month's end.
- Dry conditions across the Southern Plains contributed to above average wildfire activity during March. Across the U.S., approximately 385,000 acres burned, marking the second most active March in terms of wildfires on record, behind March 2006.
- Tornado activity was above average, with 115 preliminary tornado reports. Most of the tornado activity was confined to the Southeast and Gulf Coast, which is typical of early spring.
U.S. climate highlights "“ first quarter of 2011, rolling six- and 12-month periods
- It was the tenth driest first quarter for both the South and Southwest climate regions. New Mexico, Oklahoma, and Texas experienced their second, fifth and ninth driest January-March period, respectively.
- Both the rolling six-month and 12-month periods generally show that the northern United States has been generally wet, while the South has been dry.
- On the six-month timescale, October 2010 through March 2011, above-average precipitation occurred across much of the West, the Northern Plains and the Northeast. Nevada and Vermont each had its third-wettest such period, followed by Pennsylvania (fifth wettest), New York (eighth), and Utah (ninth). The southern plains, Midwest and Southeast were generally dry during the period, with more unusual dryness focused in the South Central United States. It was the fourth driest October 2010 "“ March 2011 for Texas, sixth driest for Oklahoma, seventh for Arkansas and Louisiana, and the eighth driest for New Mexico.
- Over the past 12 months, April 2010 "“ March 2011, a belt of abnormal wetness stretched from the western Great Lakes to the Pacific Northwest. Wisconsin had its wettest such period. Its precipitation average of 41.52 inches was more than 10 inches above its 20th century average. Additionally, Iowa, Minnesota, and North Dakota experienced their second wettest such period. Precipitation was below normal in the South during this period. It was the fourth driest in Louisiana, fifth driest in Arkansas, ninth driest in Florida, and 10th driest in Mississippi.
NCDC's State of the Climate reports, which assess the current state of the climate, are released soon after the end of each month. These analyses are based on preliminary data, which are subject to revision. Additional quality control is applied to the data when late reports are received several weeks after the end of the month and as increased scientific methods improve NCDC's processing algorithms.
On the Net: