Dangerous Fire Conditions in the Southern High Plains; Severe Weather from the Great Lakes into Central/Southern Plains; Late-Season Mountain Snow

Dry and windy conditions will produce dangerous fire weather conditions across the southern High Plains into the Southwest. Severe storms, including very large hail, strong tornadoes, and winds, are expected from the Great Lakes into the central/southern Plains. Heavy late-season snow and cold temperatures are expected in the northern to central Rockies. Heat is spreading across the eastern U.S.. Read More >

Current conditions at

Mondell Field (KECS)

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

Overcast

41°F

5°C

Humidity 66%
Wind Speed N 15 G 20 mph
Barometer 29.90 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 18 May 3:30 am MDT
Extended Forecast for

Newcastle WY

Freeze Warning May 18, 05:00am until May 18, 10:00am
Click here for hazard details and duration
Freeze Warning
  • Overnight

    Overnight: Showers likely.  Cloudy, with a low around 35. North wind around 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 60%.

    Low: 35 °F

    Showers
    Likely

  • Monday

    Monday: Rain, possibly mixed with snow showers before 9am, then rain showers likely between 9am and 11am, then rain, possibly mixed with snow showers after 11am.  High near 41. North wind 11 to 15 mph, with gusts as high as 26 mph.  Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 41 °F

    Rain/Snow

  • Monday Night

    Monday Night: Cloudy, then gradually becoming partly cloudy, with a low around 28. North wind 5 to 15 mph, with gusts as high as 26 mph.

    Low: 28 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 57. Northwest wind 5 to 8 mph, with gusts as high as 16 mph.

    High: 57 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 33. West wind around 6 mph becoming light and variable.

    Low: 33 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 67. Southeast wind 5 to 8 mph becoming southwest in the afternoon. Winds could gust as high as 15 mph.

    High: 67 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms after noon.  Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers.  Partly cloudy, with a low around 38.

    Low: 38 °F

    Chance
    Showers

Detailed Forecast

Overnight
Showers likely. Cloudy, with a low around 35. North wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Monday
Rain, possibly mixed with snow showers before 9am, then rain showers likely between 9am and 11am, then rain, possibly mixed with snow showers after 11am. High near 41. North wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Monday Night
Cloudy, then gradually becoming partly cloudy, with a low around 28. North wind 5 to 15 mph, with gusts as high as 26 mph.
Tuesday
Sunny, with a high near 57. Northwest wind 5 to 8 mph, with gusts as high as 16 mph.
Tuesday Night
Mostly clear, with a low around 33. West wind around 6 mph becoming light and variable.
Wednesday
Sunny, with a high near 67. Southeast wind 5 to 8 mph becoming southwest in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 64.
Thursday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 38.
Friday
A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 67.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 41.
Saturday
Mostly sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 47.
Sunday
Sunny, with a high near 82.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WY
 43.86°N 104.21°W (Elev. 4380 ft)
3:27 am MDT May 18, 2026
3am MDT May 18, 2026-6pm MDT May 24, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database