Forecast Details for Diagonal, IA

Recent Locations: Portland, ME Morgan, VT Diagonal, IA

Current Alerts for Diagonal, IA: Winter Weather Advisory

Overnight: Snow showers. The snow could be heavy at times. Steady temperature around 32. East northeast wind around 9 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 2 to 4 inches possible.

Tuesday: Snow showers and freezing rain, possibly mixed with sleet before 11am, then a chance of freezing rain between 11am and noon, then a chance of rain showers after noon. The snow could be heavy at times. High near 37. East southeast wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New ice accumulation of less than a 0.1 of an inch possible. New snow and sleet accumulation of less than one inch possible.

Tuesday Night: A slight chance of showers between 9pm and 3am. Mostly cloudy, with a temperature rising to around 41 by 3am. Breezy, with an east southeast wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

Wednesday: A chance of showers, with thunderstorms also possible after 4pm. Mostly sunny, with a high near 69. Windy, with a south wind 18 to 25 mph, with gusts as high as 34 mph. Chance of precipitation is 40%.

Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 43. Southwest wind 5 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 66. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Showers and possibly a thunderstorm. Low around 43. Chance of precipitation is 90%.

Friday: A 30 percent chance of showers. Mostly cloudy, with a high near 59.

Friday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.

Saturday: Showers likely. Cloudy, with a high near 68. Breezy. Chance of precipitation is 60%.

Saturday Night: Showers likely. Cloudy, with a low around 56. Chance of precipitation is 60%.

Sunday: Showers likely. Mostly cloudy, with a high near 73. Windy. Chance of precipitation is 70%.

Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Breezy.

Monday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78. Breezy.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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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 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

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds