![]() To do this, click on the clickable forecast map, as described above. To look at it another way, you can also view precipitation probabilities on a graph. These graphics are also available on our web site. So, for example, there is a 20% chance of precipitation at Bowling Green, a 41% chance of precipitation at Louisville, and a 43% chance of precipitation at Lexington over the 12-hour period that this graphic covers. Looking at a point on this graphic will tell us the probability of precipitation at that point. It is in this way that each click on our clickable forecast map can give a unique forecast to that location. The forecaster has drawn probabilities of precipitation across the region. This map shows the area that is under the responsibility of the Louisville National Weather Service office. Let's look at a graphical example of probability of precipitation. Click on a different location on the forecast map, and you will probably get a slightly different forecast. The probability of precipitation that is given in the forecast is valid only for that spot (technically a 5 kilometer square grid around that spot). When you click on the map, a personal forecast is generated for the spot on which you clicked. On our web site's homepage, there is a clickable forecast map. "Tuesday night" would run from 7pm EST (8pm EDT) Tuesday evening to 7am EST (8am EDT) Wednesday morning. The "Tuesday" period, for instance, is from 7am EST to 7pm EST (8am to 8pm EDT) on Tuesday. The time periods given in our forecasts are typically 12-hours long. So, in the example above, there is a 30% chance that at least 0.01" of rain will fall at the point for which that forecast is valid over the period of time given ("Tuesday" in this case). TUESDAY.MOSTLY CLOUDY WITH A 30 PERCENT CHANCE OF SHOWERS AND THUNDERSTORMS. Duke Marshįorecasts issued by the National Weather Service routinely include a "probability of precipitation" statement (sometimes abbreviated as "POP" or "POPS" in our forecast discussions).
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