Forecast Details for Portville, NY

Recent Locations: Greeley, CO South Yarmouth, MA Portville, NY

Current Alerts for Portville, NY: Flood Watch

Overnight: Showers likely and possibly a thunderstorm before 5am, then a chance of showers. Mostly cloudy, with a steady temperature around 57. West wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday: Showers likely, mainly between noon and 4pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 50. North wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday Night: Showers likely. Mostly cloudy, with a low around 38. Northeast wind around 6 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday: A chance of showers, mainly after 8am. Mostly cloudy, with a high near 64. South wind 5 to 8 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Night: A slight chance of showers and thunderstorms, then a chance of showers after 2am. Mostly cloudy, with a low around 52. South wind around 9 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 75. Southwest wind 9 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Light southwest wind. Chance of precipitation is 30%.

Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 77. Calm wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 60%.

Saturday Night: Showers likely and possibly a thunderstorm, then showers after 8pm. Low around 43. Chance of precipitation is 80%.

Sunday: Showers, mainly before 2pm. High near 55. Chance of precipitation is 80%.

Sunday Night: A chance of showers. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.

Monday: Mostly sunny, with a high near 47.

Monday Night: Partly cloudy, with a low around 29.

Tuesday: A chance of rain and snow showers. Partly sunny, with a high near 45. Chance of precipitation is 30%.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation