Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Mondell Field (KECS)

Lat: 43.89°NLon: 104.32°WElev: 4173ft.

Partly Cloudy

55°F

13°C

Humidity 44%
Wind Speed N 9 mph
Barometer 30.00 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 18 Jun 12:15 am MDT
Extended Forecast for

Newcastle WY

  • Overnight

    Overnight: Partly cloudy, with a low around 49. Northwest wind 5 to 7 mph.

    Low: 49 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 73. Northwest wind 5 to 9 mph, with gusts as high as 20 mph.

    High: 73 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after midnight.  Partly cloudy, with a low around 50. North wind around 7 mph becoming northeast in the evening. Winds could gust as high as 17 mph.

    Low: 50 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 78. West wind 6 to 11 mph becoming light and variable  in the afternoon. Winds could gust as high as 16 mph.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers after midnight.  Partly cloudy, with a low around 56. Light south wind becoming east 9 to 14 mph in the evening. Winds could gust as high as 23 mph.

    Low: 56 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers, then showers likely and possibly a thunderstorm after noon.  Partly sunny, with a high near 80. Southeast wind 11 to 14 mph, with gusts as high as 24 mph.  Chance of precipitation is 60%.

    High: 80 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm.  Low around 54. Chance of precipitation is 90%.

    Low: 54 °F

    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a high near 72.

    High: 72 °F

    Showers
    Likely

  • Sunday Night

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

    Low: 50 °F

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 49. Northwest wind 5 to 7 mph.
Thursday
Mostly sunny, with a high near 73. Northwest wind 5 to 9 mph, with gusts as high as 20 mph.
Thursday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 50. North wind around 7 mph becoming northeast in the evening. Winds could gust as high as 17 mph.
Juneteenth
Mostly sunny, with a high near 78. West wind 6 to 11 mph becoming light and variable in the afternoon. Winds could gust as high as 16 mph.
Friday Night
A 30 percent chance of showers after midnight. Partly cloudy, with a low around 56. Light south wind becoming east 9 to 14 mph in the evening. Winds could gust as high as 23 mph.
Saturday
A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 80. Southeast wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Saturday Night
Showers and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 72.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50.
Monday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 72.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Tuesday
A chance of showers and thunderstorms. Sunny, with a high near 75.
Tuesday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 52.
Wednesday
A chance of showers and thunderstorms. Sunny, with a high near 79.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WY
 43.86°N 104.21°W (Elev. 4380 ft)
10:23 pm MDT Jun 17, 2026
12am MDT Jun 18, 2026-6pm MDT Jun 24, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database