Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

71°F

22°C

Humidity	87%
Wind Speed	E 5 mph
Barometer	29.97 in (1013.9 mb)
Dewpoint	67°F (19°C)
Visibility	10.00 mi
Last update	15 Aug 6:53 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles NW Grafton IA

Tonight
Low: 70 °F
Chance
T-storms
Saturday
High: 88 °F
Chance
T-storms then
Mostly Sunny
Saturday Night
Low: 70 °F
Slight Chance
T-storms then
Chance
Showers
Sunday
High: 88 °F
Chance
T-storms
Sunday Night
Low: 70 °F
Chance
T-storms
Monday
High: 86 °F
Chance
T-storms
Monday Night
Low: 66 °F
Chance
T-storms
Tuesday
High: 80 °F
Slight Chance
Showers
Tuesday Night
Low: 63 °F
Partly Cloudy

Detailed Forecast

Tonight

A 40 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 70. South southwest wind 7 to 9 mph becoming southeast in the evening. New rainfall amounts between a half and three quarters of an inch possible.

Saturday

A 30 percent chance of showers and thunderstorms, mainly before 7am. Partly sunny, with a high near 88. Heat index values as high as 100. South southeast wind 8 to 10 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night

A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70. South southeast wind around 6 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday

A slight chance of showers and thunderstorms before 1pm, then a chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 88. South southeast wind 6 to 10 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southeast wind 7 to 9 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday

A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Monday Night

A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.

Tuesday

A 20 percent chance of showers before 1pm. Partly sunny, with a high near 80.

Tuesday Night

Partly cloudy, with a low around 63.

Wednesday

Mostly sunny, with a high near 79.

Wednesday Night

Mostly clear, with a low around 60.

Thursday

Mostly sunny, with a high near 80.