![]() ![]() In Table 4.B., the hourly frequenciesįor Casper, Cheyenne, Lander, and Sheridan show that from 1949-2001, more than 70% of the time no precipitation fell, and of the In Wyoming, there are currently only four first class weather stations where hourly precipitation measurements are Values helps to provide flexibility for adjusting to all conditions. Because climate averages are seldom experienced, knowing the range of possible Therefore the more extreme an event is, the higher the absolute By definition, one standard deviation (sd)Īpproximates 68% of all occurrences while two sd Which represents the likelihood of an event occurring (if they are truly random). When we look at climate data statistics, a normal distribution (bell shaped curve) is assumed Annual precipitation at 2km resolution in Wyoming Retrofitted to withstand these unusual stress events at the best dollar cost-to-risk consideration.įigure 4.1. Structural engineer knows when to expect a 100-year flood, bridge supports can be built or Just a few days, the prairies would fail to effectively "greenup". However, if the normal total spring rains occurred in Grazing ratios ( i.e., cattle per acres). Week after week, they can adjust their livestock numbers accordingly to yield maximum Will be normal and distributed more or less evenly Or, if the ranching community knows that spring precipitation State, then knowing when the winter snows will dominate is important. Industry wants to advertise the best times to visit the Rainfall for a given period does not provide enough information for optimal planning of activities. In most climate atlases, the typical information showing total average amount of In this chapter the three characteristics of rainfall frequency, duration, and intensity will beĭiscussed. Precipitation occurs on average only one in five The greatest official 24-hour total recorded for any place in Wyoming is 6.06 inches atĬheyenne on Aug(39% annual total). On rare occasions, 24-hour amounts range from three There are usually several local storms each year with one to Occasionally there will be some very heavy rain associated with thunderstormsĬovering a few square miles. In Figure 4.1, the annual precipitation across Wyoming is shownĪt a 2km resolution (1 km = 0.6 mile, or 1 mile = 1.6 km).ĭuring the summer, showers are quite frequent but often amount to only a few hundredths Gridded estimates of climate parameters 31, 31a a more representative depiction of WyomingĬlimate has been achieved. Point data and a digital elevation model (DEM) to generate However by using PRISM, (Parameter-Elevation Regressions on Independent Slopes Model) an expert system that uses Certainly the spacing of these stations would notĪllow for the accurate resolution of any climate element such as precipitation. Record precipitation events in Wyoming (inches)įrom 1961-1990 (the previous Normals period), there were about 130 stations across Wyoming that had a continuousĬlimate record. The long-term (1895-2003) statewide average rainfall is 13.07 inches. Is 55.46 inches at Grassy Lake Dam (7,240 feet) in 1945 Recorded, for any place in Wyoming is 1.28 inches at Lysite (5,260 feet) in 1960 and the greatest, annual lower elevation total In the southern part of the basin, Worland at 4,172 feet has an annual mean of eight inchesĪs compared with Thermopolis at 4,313 feet with 12 inches. Showing the least amount is Lovell at 3,837 feet with an annual mean of about 6.74 inches. The basin has an annual rainfall of 5 to 8 inches, and is the driest part of the state. The flow of moisture-laden air from the east as well as from the west. The Bighorn basin provides a striking example of the effect of mountain ranges in blocking The relatively dry southwest portion is a high plateau nearly surrounded by mountain Where the elevations range mostly from 4,000 to 5,500 feet, annual averages are 12 to 16 At lower elevations over the northeast and along the eastern border, Portion of the state, the elevation ranges from 6,500 to 8,500 feet, and annual rainfall variesįrom seven to 10 inches. Rainfall is greater over the mountain ranges and usually at the higher elevations, althoughĮlevation alone is not the predominant influence. The period of maximum rainfall occurs in the spring and early summer for most of the state. Have some limitations over the intermountain west, but some data are still better than no data. With a limited number of weather stations reporting rainfall, estimates from weather radar 30 Like other states in the west, precipitation 29 varies a great ![]()
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