![]() Which weather system is bigger or covers more spatial area? Despite this size difference, Ian still packed quite a "punch." a. Focus on the extent of their concentric isobaric patterns. Compare the relative size of both Hurricane Ian and the synoptic-scale Great Lakes high pressure system in both figures. Wind gusts were very likely even higher, approaching hurricane force. This value falls within the Tropical Storm category. The reported sustained wind speeds in Figure 1 at Key West (with four long feathers and one short one) was reported as kts. ![]() Despite the fact that Hurricane Ian stayed mostly to the west of Key West, the effects could still be felt in that populated area. On the western flank of the Great Lakes high pressure, where winds were generally coming from the south, temperatures along the Montana/North Dakota-Canadian border were than temperatures in Indiana and Tennessee. Even closer to the center of the Great Lakes high pressure, reported winds were very different than those in the southeast region, such that Indianapolis, IN was reporting conditions. At Nashville (in central Tennessee) in Figure 2, which was under greater influence of the high pressure, the temperature was reported to be the same as in Gainesville ( 5 9 ∘ F ), but the dew point was significantly as a. While rain was not reported, there was however, reported with the current weather symbol. At Gainesville (in northeast FL) in Figure 2, the air mass immediately behind the front cooled temperatures to the dewpoint. In Figure 2, the temperature and dewpoint were of equal value at 7 2 ∘ F. Focus attention on the current weather symbols in both figures for this station. There is evidence in Figure 1 and Figure 2 that precipitation (light and moderate intensity respectively) falling at the Tampa Bay station. Ian's extreme low pressure and tight circulation forced low-level winds to provide a lifting mechanism for the air, leading to clouds and precipitation. Given your answer to #1, there would be available low-level water vapor to rise and condense as liquid water. Dewpoints in central and southern Florida on the southern side of the front had significantly values than those in northern Florida, Georgia, and Alabama. Comparing Figure 1 and Figure 2, the air masses on either side of the Atlantic stationary front had distinct differences in temperature and moisture. Analyzed weather map with isobars, fronts, and data for 0Z. Hence, winds in the vicinity of the Oregon-Washington low pressure system are much less intense.įigure 2. You will likely note that the central lowest pressure of this decaying system is much higher than the values produced by Ian. An occluded mid-latitude cyclone in the Pacific Northwest was coming ashore in the states of Oregon and Washington. This boundary ahead of Ian likely aided uplift along and ahead of this boundary, producing clouds and precipitation. The Canadian Maritime front noted in Figure 1 had not made much progress but it was now closer to the tropical system. What is perhaps immediately evident is Hurricane Ian's movement on shore, battering southwest and central Florida. Figure 2 is a weather map from 0Z 29 September 2022, which shows the 21-hr progression of the pressure systems and changes in weather since Figure 1. The next figure will show the movement of this pressure system (and the associated fronts). ![]() This high pressure was bounded on the east and west with frontal boundaries, separating cool dry air from warmer, more moist air beyond those air mass boundaries. ![]() ![]() Northern Plains states, where temperatures were mostly in the upper 40s and 50 s ( ∘ F ). ![]()
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