Q: Does 40 percent chance of rain mean that it will rain?

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A 40 percent chance of rain means that it is slightly more likely that there will not be rain. Sixty percent chance of rain is the opposite. It is slightly more likely that it will rain than not.

A 40 percent chance of scattered thunderstorms means that there is a moderate likelihood of thunderstorms occurring in the area, but it does not guarantee continuous rainfall all day. It suggests that there is a moderate probability of some areas receiving rain from isolated or scattered thunderstorms, and the overall coverage and duration of rainfall may vary.

To find the probability that it will rain both today and tomorrow, you multiply the individual probabilities: 0.60 (chance of rain today) * 0.40 (chance of rain tomorrow) = 0.24 or 24%. Therefore, there is a 24% chance that it will rain both today and tomorrow.

92 °F Chance of T-storms 40% chance of precipitation

The rain during the Great Flood is said to have lasted for 40 days and 40 nights according to biblical accounts.

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A 40 percent chance of rain means that it is slightly more likely that there will not be rain. Sixty percent chance of rain is the opposite. It is slightly more likely that it will rain than not.

No, 40% chance of rain is How Likely it is to rain for that day,or week. Not Area. LOL

No. A 60% chance of rain means exactly what it sounds like: there is a 60% chance that it will rain. This also means that there is a 40% chance that it will not rain.

A 40 percent chance of rain means that there is a moderate likelihood of experiencing rain, but it's not considered particularly high. It suggests that there's a chance of rain, but it's still possible that it might not rain at all.

It is 67%.

A 40 percent chance of scattered thunderstorms means that there is a moderate likelihood of thunderstorms occurring in the area, but it does not guarantee continuous rainfall all day. It suggests that there is a moderate probability of some areas receiving rain from isolated or scattered thunderstorms, and the overall coverage and duration of rainfall may vary.

There needs to be a location as well as a time interval. A statement such as "there is a 40% chance that it will rain in Yourtown over the 12 hours starting at sunrise tomorrow" means that if you consider a whole lot of days like tomorrow - with the same sort of weather as you experienced over the last few days - then in 4 days out of 10 (40%), it will rain tomorrow. Just to complicate matters, the statement does not distinguish between there being a 40% probability that it will rain non-stop or that it will rain briefly.

To find the probability that it will rain both today and tomorrow, you multiply the individual probabilities: 0.60 (chance of rain today) * 0.40 (chance of rain tomorrow) = 0.24 or 24%. Therefore, there is a 24% chance that it will rain both today and tomorrow.

20% first day, 40% second day, Total percent of rain over the two days is (20+40)/2 = 30% per day

Forecasts issued by the National Weather Service routinely include a "PoP" (probability of precipitation) statement, which is often expressed as the "chance of rain" or "chance of precipitation".EXAMPLEZONE FORECASTS FOR NORTH AND CENTRAL GEORGIANATIONAL WEATHER SERVICE PEACHTREE CITY GA119 PM EDT THU MAY 8 2008GAZ021-022-032034-044046-055-057-090815-CHEROKEE-CLAYTON-COBB-DEKALB-FORSYTH-GWINNETT-HENRY-NORTH FULTON-ROCKDALE-SOUTH FULTON-INCLUDING THE CITIES OF...ATLANTA...CONYERS...DECATUR...EAST POINT...LAWRENCEVILLE...MARIETTA119 PM EDT THU MAY x 2008.THIS AFTERNOON...MOSTLY CLOUDY WITH A 40 PERCENT CHANCE OFSHOWERS AND THUNDERSTORMS. WINDY. HIGHS IN THE LOWER 80S. NEARSTEADY TEMPERATURE IN THE LOWER 80S. SOUTH WINDS 15 TO 25 MPH..TONIGHT...MOSTLY CLOUDY WITH A CHANCE OF SHOWERS ANDTHUNDERSTORMS IN THE EVENING...THEN A SLIGHT CHANCE OF SHOWERSAND THUNDERSTORMS AFTER MIDNIGHT. LOWS IN THE MID 60S. SOUTHWESTWINDS 5 TO 15 MPH. CHANCE OF RAIN 40 PERCENT.What does this "40 percent" mean? ...will it rain 40 percent of of the time? ...will it rain over 40 percent of the area?The "Probability of Precipitation" (PoP) describes the chance of precipitation occurring at any point you select in the area.How do forecasters arrive at this value?Mathematically, PoP is defined as follows: PoP = C x A where "C" = the confidence that precipitation will occur somewhere in the forecast area, and where "A" = the percent of the area that will receive measureable precipitation, if it occurs at all.So... in the case of the forecast above, if the forecaster knows precipitation is sure to occur ( confidence is 100% ), he/she is expressing how much of the area will receive measurable rain. ( PoP = "C" x "A" or "1" times ".4" which equals .4 or 40%.)But, most of the time, the forecaster is expressing a combination of degree of confidence and areal coverage. If the forecaster is only 50% sure that precipitation will occur, and expects that, if it does occur, it will produce measurable rain over about 80 percent of the area, the PoP (chance of rain) is 40%. ( PoP = .5 x .8 which equals .4 or 40%. )In either event, there is a correct way to interpret the forecast: According to the NWS, "CHANCE OF RAIN 40 PERCENT" means there is a 40 percent chance that rain will occur at any given point in the area.NOTE! However, this is not entirely accurate language. It is better expressed as: "CHANCE OF RAIN 40 PERCENT" means the on average for all of the points in the area during the specified time period (usually 12 hour periods), chance that rain will occur (on average) is 40%.Explanation:Suppose the the forecast were for Maui, HI. One "given" point is your house near the top of Mt. Haleakala, where it rains almost constantly. 40% percent is obviously not accurate for that given point. So assume that Mt. Haleakala is 10% of the area of Maui and that the average chance of rain today there is 80%. And assume that the average chance of rain for the other 90% of the island is 35%. So for the entire island, the average chance of rain is (.9 * .35) + (.1 * .8) = .4 = 40%. Clearly, the smaller the area, the more meaningful and accurate "chance of rain" is.

Well I thinking I would say you have a..... 30-40% chance of rain on you wedding day.

If there is a 40% chance of rain on Monday, 50% on Tuesday, and 40% on Wednesday then math tells us that there is a 82% chance of rain over those 3 days. Lately I have seen percentages listed for each hour of the day. For example, a 60% chance of rain for 7, 8, 9, 10, and 11 in the morning. Does that mean there is a 99% chance of rain that morning?