![]() ![]() ![]() When you are planning your trip into The Narrows, you should also be aware of the flash flood potential. Although weather might be over 100 degrees the day of your hike, this narrow section of the canyon can stay considerably cooler, making non-cotton clothing, like polypropylene or wool, more ideal for its insulating benefits even while wet. Every hiker in The Narrows should have closed toed shoes, even just your regular hiking boots, and a walking stick. Due to the risks of a hike like this, proper preparation is imperative, both for your safety and your enjoyment. However, unlike most hikes, taking on the Narrows means actually traveling upstream through the Virgin River on uneven, slippery, and rocky river boulders. One of our more popular hikes visitors come to enjoy is the unique Narrows, a hike in a canyon that in places is only 20-30 feet wide, and 2000 feet deep. Zion is a popular National Park where visitors come to immerse themselves within the grandeur of the canyon’s cliffs, and to challenge themselves with one of our many scenic and adventurous hikes. A thorough knowledge and use of a modified hodograph would greatly enhance a forecaster's anticipation this type of storm behavior.Welcome to Zion National Park, my name is Jonathan. Also, strong values of instability, storm-relative inflow, and wind shear can occasionally all be found north of a surface boundary. Since the WSR-88D mesocyclone algorithm does not search for meso-anticyclones, it is incumbent upon the forecaster to be alert to the possibility for these types of circulations. There were significant challenges to forecasters in real-time anticipation (or even appreciation) of the storm behavior in the Big Spring area. Also, a significant overhang was present in the updraft region on the northern flank of the storm. Also, the north wind supplied good inflow to this northeastward moving storm and induced strong vertical shear through the lowest 6 km.Īn analysis of WSR-88D VR/Shear on the Big Spring storm showed that a deep, persistent anticyclonic rotation was detected for at least two hours. Stable conditions are often found north of a surface boundary, however, high time resolution weather data from the USDA Agricultural Research Station in Big Spring suggested that surface conditions were quite unstable. North winds north of the boundary and southeast winds south of the boundary enhanced storm-relative inflow in both areas. Supercell thunderstorms developed in both areas with strong mesocyclones in the San Angelo area and strong meso-anticyclones in the Big Spring area. ![]() Alternatively, a hodograph depicting conditions in the San Angelo area showed positive helicity and favored persistent mesocyclones. The hodograph, adjusted for conditions near Big Spring, showed negative storm-relative helicity and a sufficient vertical wind profile to maintain storms with a persistent meso-anticyclone. Low-level winds in the Big Spring area were northerly prior to the storm. The pairs to these splitting storms in each area quickly dissipated. Indeed, storms did split across the region with left-split storms surviving north of the boundary, while right-split storms survived south of the boundary. The evening sounding taken at Midland revealed a straight-line hodograph with sufficient shear, indicating splitting storms could be expected. Storms initiated both north and south of the surface trough. This case study discusses the synoptic setting as well as characteristics of the storm as depicted on the Midland, Texas WSR-88D radar.Īn upper level shortwave trough was approaching the area, while at the surface a pre-frontal trough extended northeast to southwest between Big Spring and San Angelo, Texas. On the city of Big Spring, Texas was pummeled by a left-split supercell thunderstorm that produced tennis ball or greater size hail over half of this city of 25,000 people. Left-split supercell thunderstorms have been the subject of only a limited amount of research over the years. P10.1 An example of a left-split supercell producing 5-inch hail: The Big Spring, Texas Storm of (2000 - Sept2000_20sls) 20th Conference on Severe Local StormsĪn example of a left-split supercell producing 5-inch hail: The Big Spring, Texas Storm of
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