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Environment Canada reports a chance of precipitation (COP) that is defined as "The chance that measurable precipitation (0.2 mm of rain or 0.2 cm of snow) will fall on any random point of the forecast region during the forecast period." [7] The values are rounded to 10% increments, but are never rounded to 50%. [8]
TODAY: A few storms around in the morning (especially along and to the north of I-20). Rain will become more widespread Saturday Night. Chance of rain: 80%. High: 63. Winds: NE 10-15 MPH. SUNDAY ...
The high risk was issued at 1630Z driven by 60% significant severe wind probability as the maximum tornado probability was a hatched 15% area, just short of the high risk level. A total of 19 tornadoes were confirmed; one was rated EF3. 278 damaging wind gusts were reported, including 4 hurricane force gusts, though most occurred over Ohio and ...
The simplest method of forecasting the weather, persistence, relies upon today's conditions to forecast tomorrow's. This can be valid when the weather achieves a steady state, such as during the summer season in the tropics. This method strongly depends upon the presence of a stagnant weather pattern.
Heavy rain will spread across portions of the Southeastern states into Thursday night as Rafael churns hundreds of miles to the south over the Gulf of Mexico, AccuWeather meteorologists warn. The ...
El Niño conditions are forecast to last until next spring.
This method has been used for years within National Weather Service forecasts, as a period's chance of rain equals the chance that 0.01 inches (0.25 mm) will fall in any particular spot. [16] In this case, it is known as probability of precipitation. These probabilities can be derived from a deterministic forecast using computer post-processing.
Your probability of precipitation is simply the chance of rain on a scale of zero to 100, if it's warm enough for rain, at some point in the forecast time." And, he added, "the same applies to ...