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February 2021 Historical Winter Storm Event South-Central Texas
Austin/San Antonio Weather Forecast Office WEATHER EVENT SUMMARY February 2021 Historical Winter Storm Event South-Central Texas 10-18 February 2021 A Snow-Covered Texas. GeoColor satellite image from the morning of 15 February, 2021. February 2021 South Central Texas Historical Winter Storm Event South-Central Texas Winter Storm Event February 10-18, 2021 Event Summary Overview An unprecedented and historical eight-day period of winter weather occurred between 10 February and 18 February across South-Central Texas. The first push of arctic air arrived in the area on 10 February, with the cold air dropping temperatures into the 20s and 30s across most of the area. The first of several frozen precipitation events occurred on the morning of 11 February where up to 0.75 inches of freezing rain accumulated on surfaces in Llano and Burnet Counties and 0.25-0.50 inches of freezing rain accumulated across the Austin metropolitan area with lesser amounts in portions of the Hill Country and New Braunfels area. For several days, the cold air mass remained in place across South-Central Texas, but a much colder air mass remained stationary across the Northern Plains. This record-breaking arctic air was able to finally move south into the region late on 14 February and into 15 February as a strong upper level low-pressure system moved through the Southern Plains. As this system moved through the region, snow began to fall and temperatures quickly fell into the single digits and teens. Most areas of South-Central Texas picked up at least an inch of snow with the highest amounts seen from Del Rio and Eagle Pass extending to the northeast into the Austin and San Antonio areas. -
Winter Bird Feeding
BirdNotes 1 Winter Bird Feeding birds at feeders in winter If you feed birds, you’re in good company. Birding is one of North America’s favorite pastimes. A 2006 report from the U.S. Fish and Wildlife Service estimates that about 55.5 mil- lion Americans provide food for wild birds. Chickadees Titmice Cardinals Sparrows Wood- Orioles Pigeons Nuthatches Finches Grosbeaks Blackbirds Jays peckers Tanagers Doves Sunflower ◆ ◆ ◆ ◆ ◆ ◆ ◆ Safflower ◆ ◆ ◆ Corn ◆ ◆ ◆ Millet ◆ ◆ ◆ Milo ◆ ◆ Nyjer ◆ Suet ◆ ◆ ◆ ◆ ◆ Preferred ◆ Readily Eaten Wintertime—and the Living’s counting birds at their feeders during selecting the best foods daunting. To Not Easy this winterlong survey. Great Back- attract a diversity of birds, provide a yard Bird Count participants provide variety of food types. But that doesn’t n much of North America, winter valuable data with a much shorter mean you need to purchase one of ev- Iis a difficult time for birds. Days time commitment—as little as fifteen erything on the shelf. are often windy and cold; nights are minutes in mid-February! long and even colder. Lush vegeta- Which Seed Types tion has withered or been consumed, Types of Bird Food Should I Provide? and most insects have died or become uring spring and summer, most dormant. Finding food can be espe- lack-oil sunflower seeds attract songbirds eat insects and spi- cially challenging for birds after a D Bthe greatest number of species. ders, which are highly nutritious, heavy snowfall. These seeds have a high meat-to- abundant, and for the most part, eas- shell ratio, they are nutritious and Setting up a backyard feeder makes ily captured. -
Winter Jet Stream Trends Over the Northern Hemisphere
QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY Q. J. R. Meteorol. Soc. 133: 2109–2115 (2007) Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/qj.171 Winter jet stream trends over the Northern Hemisphere Courtenay Stronga* and Robert E. Davisb a University of California, Irvine, USA b Department of Environmental Sciences, University of Virginia, Charlottesville, USA ABSTRACT: Trends in the speed and probability of winter jet stream cores over the Northern Hemisphere were measured for 1958–2007, and related changes in the thermal structure of the troposphere were identified. Eddy-driven jet (EDJ) core speeds and probabilities increased over the midlatitudes (40–60 °N), with changes as large as 15% (speed) and 30% (probability). These increasing trends are collocated with increases in baroclinicity driven by a spatially heterogeneous pattern of height change consisting of large-scale warming with cooling centres embedded poleward of 60 °N. The cooling centres reduced high-latitude baroclinicity, making jet cores poleward of 60 °N less frequent and weaker. Over the west and central Pacific, subtropical jet stream (STJ) core probabilities remained relatively constant while core speeds increased by as much as 1.75 m/s decade−1 in association with Hadley cell intensification. The STJ shifted poleward over the east Pacific and Middle East, and an equatorward shift and intensification of the STJ were found over the Atlantic basin–contributing to an increased separation of the EDJ and STJ. Copyright 2007 Royal Meteorological Society KEY WORDS general circulation; climate change; global warming Received 25 March 2007; Revised 23 August 2007; Accepted 18 September 2007 1. -
Companion Q&A Fact Sheet: What Mars Reveals About Life in Our
What Mars Reveals about Life in Our Universe Companion Q&A Fact Sheet Educators from the Smithsonian’s Air and Space and Natural History Museums assembled this collection of commonly asked questions about Mars to complement the Smithsonian Science How webinar broadcast on March 3, 2021, “What Mars Reveals about Life in our Universe.” Continue to explore Mars and your own curiosities with these facts and additional resources: • NASA: Mars Overview • NASA: Mars Robotic Missions • National Air and Space Museum on the Smithsonian Learning Lab: “Wondering About Astronomy Together” Guide • National Museum of Natural History: A collection of resources for teaching about Antarctic Meteorites and Mars 1 • Smithsonian Science How: “What Mars Reveals about Life in our Universe” with experts Cari Corrigan, L. Miché Aaron, and Mariah Baker (aired March 3, 2021) Mars Overview How long is Mars’ day? Mars takes 24 hours and 38 minutes to spin around once, so its day is very similar to Earth’s. How long is Mars’ year? Mars takes 687 days, almost two Earth years, to complete one orbit around the Sun. How far is Mars from Earth? The distance between Earth and Mars changes as both planets move around the Sun in their orbits. At its closest, Mars is just 34 million miles from the Earth; that’s about one third of Earth’s distance from the Sun. On the day of this program, March 3, 2021, Mars was about 135 million miles away, or four times its closest distance. How far is Mars from the Sun? Mars orbits an average of 141 million miles from the Sun, which is about one-and-a-half times as far as the Earth is from the Sun. -
1A.1 a Unique Cold-Season Supercell Produces an Ef1 ‘Snownado’
1A.1 A UNIQUE COLD-SEASON SUPERCELL PRODUCES AN EF1 ‘SNOWNADO’ David Sills1*, Marie-Ève Giguère2, and John Henderson3 1Science and Technology Branch, Environment and Climate Change Canada (ECCC), King City, ON 2Meteorological Service of Canada, ECCC, Montréal, QC 3Atmospheric and Environmental Research, Lexington, MA 1. INTRODUCTION1 2. STORM EVOLUTION On November 23, 2013, the ‘forecast problem du A weak low-pressure system moved southeast jour’ in southern Ontario, Canada, was the onset across the Great Lakes area during the morning of of significant snow squalls to the lee of the Great November 23rd. An associated secondary low Lakes following the passage of an Arctic cold front rapidly intensified while traversing the relatively (Fig. 1a). It was discovered a short time later warm (~7ºC) waters of Lake Huron’s Georgian however that, in addition to snow squalls, a Bay (Fig. 2). tornado had occurred that day. Low-level reflectivity images from the Environment An EF1 tornado track was identified at Charleville and Climate Change Canada (ECCC) radar in (Fig. 1b) via an on-site damage survey. It was Britt, ON, show the transformation from a cluster found to have a path length of at least 270 m (Fig. of showers on the west side of Georgian Bay at 1c), a path width of 75 m and an event time of 0900 UTC (Fig. 3a) to a well-developed vortex just 2015 UTC+. No fatalities or injuries resulted, but inland from the east side of the Bay at 1200 UTC farm structures (Fig. 1d) and trees were damaged. (Fig. 3b). Similar cyclone intensification over the Great Lakes was found by Angel and Isard (1997). -
ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY
ESSENTIALS OF METEOROLOGY (7th ed.) GLOSSARY Chapter 1 Aerosols Tiny suspended solid particles (dust, smoke, etc.) or liquid droplets that enter the atmosphere from either natural or human (anthropogenic) sources, such as the burning of fossil fuels. Sulfur-containing fossil fuels, such as coal, produce sulfate aerosols. Air density The ratio of the mass of a substance to the volume occupied by it. Air density is usually expressed as g/cm3 or kg/m3. Also See Density. Air pressure The pressure exerted by the mass of air above a given point, usually expressed in millibars (mb), inches of (atmospheric mercury (Hg) or in hectopascals (hPa). pressure) Atmosphere The envelope of gases that surround a planet and are held to it by the planet's gravitational attraction. The earth's atmosphere is mainly nitrogen and oxygen. Carbon dioxide (CO2) A colorless, odorless gas whose concentration is about 0.039 percent (390 ppm) in a volume of air near sea level. It is a selective absorber of infrared radiation and, consequently, it is important in the earth's atmospheric greenhouse effect. Solid CO2 is called dry ice. Climate The accumulation of daily and seasonal weather events over a long period of time. Front The transition zone between two distinct air masses. Hurricane A tropical cyclone having winds in excess of 64 knots (74 mi/hr). Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist. Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) Mesosphere The atmospheric layer between the stratosphere and the thermosphere. -
Physical Changes
How Matter Changes By Cindy Grigg Changes in matter happen around you every day. Some changes make matter look different. Other changes make one kind of matter become another kind of matter. When you scrunch a sheet of paper up into a ball, it is still paper. It only changed shape. You can cut a large, rectangular piece of paper into many small triangles. It changed shape and size, but it is still paper. These kinds of changes are called physical changes. Physical changes are changes in the way matter looks. Changes in size and shape, like the changes in the cut pieces of paper, are physical changes. Physical changes are changes in the size, shape, state, or appearance of matter. Another kind of physical change happens when matter changes from one state to another state. When water freezes and makes ice, it is still water. It has only changed its state of matter from a liquid to a solid. It has changed its appearance and shape, but it is still water. You can change the ice back into water by letting it melt. Matter looks different when it changes states, but it stays the same kind of matter. Solids like ice can change into liquids. Heat speeds up the moving particles in ice. The particles move apart. Heat melts ice and changes it to liquid water. Metals can be changed from a solid to a liquid state also. Metals must be heated to a high temperature to melt. Melting is changing from a solid state to a liquid state. -
Cosmic Microwave Background
1 29. Cosmic Microwave Background 29. Cosmic Microwave Background Revised August 2019 by D. Scott (U. of British Columbia) and G.F. Smoot (HKUST; Paris U.; UC Berkeley; LBNL). 29.1 Introduction The energy content in electromagnetic radiation from beyond our Galaxy is dominated by the cosmic microwave background (CMB), discovered in 1965 [1]. The spectrum of the CMB is well described by a blackbody function with T = 2.7255 K. This spectral form is a main supporting pillar of the hot Big Bang model for the Universe. The lack of any observed deviations from a 7 blackbody spectrum constrains physical processes over cosmic history at redshifts z ∼< 10 (see earlier versions of this review). Currently the key CMB observable is the angular variation in temperature (or intensity) corre- lations, and to a growing extent polarization [2–4]. Since the first detection of these anisotropies by the Cosmic Background Explorer (COBE) satellite [5], there has been intense activity to map the sky at increasing levels of sensitivity and angular resolution by ground-based and balloon-borne measurements. These were joined in 2003 by the first results from NASA’s Wilkinson Microwave Anisotropy Probe (WMAP)[6], which were improved upon by analyses of data added every 2 years, culminating in the 9-year results [7]. In 2013 we had the first results [8] from the third generation CMB satellite, ESA’s Planck mission [9,10], which were enhanced by results from the 2015 Planck data release [11, 12], and then the final 2018 Planck data release [13, 14]. Additionally, CMB an- isotropies have been extended to smaller angular scales by ground-based experiments, particularly the Atacama Cosmology Telescope (ACT) [15] and the South Pole Telescope (SPT) [16]. -
NJSIAA Updates High School Sports Calendar
Contact: Michael Cherenson (973.919.6228 or [email protected]) NJSIAA updates high school sports calendar Winter competition pushed into the New Year Spring schedules to be finalized in December ROBBINSVILLE, NJ (Nov. 19, 2020) – The NJSIAA’s Sports Advisory Task Force – the statewide group of athletic administrators tasked with developing return-to-play protocols for New Jersey high school sports – today issued its final plan for the winter sports season. Competition for all winter sports will begin after the New Year. Ice hockey may start practicing on December 14, 2020; basketball, fencing and bowling may start practicing on January 11, 2021; swimming and winter track & field may start practicing on February 1; and gymnastics, girls’ volleyball, and wrestling may start practicing on March 1. The following is the 2020-2021 winter sports calendar (Download Here). Under Executive Order 196, indoor practices and competitions are limited to 10 persons, however, if the number of individuals who are necessary for the practice or competition, such as players, coaches, and referees, is greater than 10 persons, the practice or competition may proceed. If this exception applies, the number of individuals still may not exceed 25 percent of the capacity of the room in which it takes place, or 150 persons, whichever is less. Practically speaking, this means that spectators are prohibited. (more) 1 Page 2 of 2 A memo, shared with all NJSIAA member schools, provides greater detail on the current plan. The Sports Advisory Task Force remains committed to providing as complete of a spring season as possible and will release final spring sports season plans on or before Friday, December 11, 2020. -
The Jet Stream and Climate Change Martin Stendel1, Jennifer Francis2, Rachel White3, Paul D
CHAPTER 15 The jet stream and climate change Martin Stendel1, Jennifer Francis2, Rachel White3, Paul D. Williams4, Tim Woollings5 1Department of Climate and Arctic Research, Danish Meteorological Institute, Copenhagen, Denmark; 2Woodwell Climate Research Center, Falmouth, MA, United States; 3Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; 4Department of Meteorology, University of Reading, Reading, United Kingdom; 5Department of Physics, University of Oxford, Oxford, United Kingdom 1. Introduction 1.1 Jet streams The jet streams are powerful, relatively narrow currents of air that encircle the globe from west to east in both the northern and southern hemispheres. While the strongest winds are found at heights of 10e15 km, typical of cruising aircraft, jet streams, particularly in temperate latitudes, “steer” the movement of frontal zones and air masses, thus affecting sur- face weather and contributing to the prevailing westerly winds familiar to many in the mid- latitude regions. The jet streams rose to prominence in meteorology following World War II, when high- altitude air campaigns had on several occasions been adversely affected by unexpectedly strong winds [1]. The establishment of hemispheric-scale networks of radiosonde observa- tions by Carl-Gustav Rossby and collaborators in the 1940s and 1950s identified for the first time the global nature of the jet streams and the waves that propagate along them [2]. Since then, the jets have been central to our understanding of weather patterns and climate variability. Although not observed or measured until relatively recently, the existence of jet streams was theorized by George Hadley in the 18th century in his groundbreaking discussion on the cause of the tropical trade winds [3]. -
Spring Winter Summer Autumn
• Always drive on good, properly inflated issouri is a state of four seasons tires. and each season has its own unique road conditions. Missouri driving • Know and obey all traffic laws. cannot be categorized entirely into spring, summer, autumn, or winter. Nature some- • Be ready to adjust your speed to be ap- times mixes our four seasons together, and propriate for constantly changing driving this can cause problems when we travel. conditions. This brochure has been prepared to give you some tips on how to handle our Finally, let’s all work together, so fewer many varied driving conditions. people will become traffic crash statistics on Missouri’s highways. Spring Buckle Up Missouri! • Never drive when you have been drink- ing alcoholic beverages. Summer • Never ride with someone who has been drinking. • If medication directions indicate you should not drive after taking it, don’t do Feel free to call the it. Road Condition Report Hotline at: Produced by: Public Information and Education Division • Have a good attitude when you drive. Be Published by: Autumn patient with others. 1-888-275-6636 Missouri State Highway Patrol 1510 East Elm Street • Give driving your full attention. Behind Or, check the Patrol’s Jefferson City, MO 65101 the wheel is no place to read, put on 573-751-3313 makeup, or talk on the cell phone. web site at: V/TDD 573-751-3313 email: [email protected] • How about those eyes? Don’t be vain. If www.mshp.dps.mo.gov www.mshp.dps.mo.gov Winter you need glasses, wear them. -
Air Masses, Fronts, Storm Systems, and the Jet Stream
Air Masses, Fronts, Storm Systems, and the Jet Stream Air Masses When a large bubble of air remains over a specific area of Earth long enough to take on the temperature and humidity characteristics of that region, an air mass forms. For example, when a mass of air sits over a warm ocean it becomes warm and moist. Air masses are named for the type of surface over which they formed. Tropical = warm Polar = cold Continental = over land = dry Maritime = over ocean = moist These four basic terms are combined to describe four different types of air masses. continental polar = cool dry = cP continental tropical = warm dry = cT maritime polar = cool moist = mP maritime tropical = warm moist = mT The United States is influenced by each of these air masses. During winter, an even colder air mass occasionally enters the northern U.S. This bitterly cold continental arctic (cA) air mass is responsible for record setting cold temperatures. Notice in the central U.S. and Great Lakes region how continental polar (cP), cool dry air from central Canada, collides with maritime tropical (mT), warm moist air from the Gulf of Mexico. Continental polar and maritime tropical air masses are the most dominant air masses in our area and are responsible for much of the weather we experience. Air Mass Source Regions Fronts The type of air mass sitting over your location determines the conditions of your location. By knowing the type of air mass moving into your region, you can predict the general weather conditions for your location. Meteorologists draw lines called fronts on surface weather maps to show the positions of air masses across Earth’s surface.