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Severe Weather Watches Overview

Watch data currently updates every 15 minutes.

Severe Thunderstorm Watch #0279 for Northeast Colorado, Western Nebraska, Southwest South Dakota, Eastern Wyoming
  • Scattered large hail and isolated very large hail events to 2 inches in diameter possible
  • Scattered damaging wind gusts to 70 mph possible
  • A tornado or two possible

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Severe Thunderstorm Watch #0279

Locations Affected

  • Northeast Colorado
  • Western Nebraska
  • Southwest South Dakota
  • Eastern Wyoming
  • Severe Thunderstorm Watch Summary

    Relatively isolated strong to severe thunderstorms at mid-afternoon should gradually increase in coverage and intensity through late afternoon and early evening within an increasingly unstable air mass across the High Plains. A relatively moist air mass and strengthening winds aloft will support some supercells capable of large hail. Storms may eventually cluster into a semi-organized system capable of localized wind damage later this evening.

    Severe Weather Threats

  • Scattered large hail and isolated very large hail events to 2 inches in diameter possible
  • Scattered damaging wind gusts to 70 mph possible
  • A tornado or two possible
  • Severe Thunderstorm Watch Details

    SEL9
    
    URGENT - IMMEDIATE BROADCAST REQUESTED
    Severe Thunderstorm Watch Number 279
    NWS Storm Prediction Center Norman OK
    310 PM MDT Tue Jul 17 2018
    
    The NWS Storm Prediction Center has issued a
    
    * Severe Thunderstorm Watch for portions of 
      Northeast Colorado
      Western Nebraska
      Southwest South Dakota
      Eastern Wyoming
    
    * Effective this Tuesday afternoon and evening from 310 PM until
      1100 PM MDT.
    
    * Primary threats include...
      Scattered large hail and isolated very large hail events to 2
        inches in diameter possible
      Scattered damaging wind gusts to 70 mph possible
      A tornado or two possible
    
    SUMMARY...Relatively isolated strong to severe thunderstorms at
    mid-afternoon should gradually increase in coverage and intensity
    through late afternoon and early evening within an increasingly
    unstable air mass across the High Plains. A relatively moist air
    mass and strengthening winds aloft will support some supercells
    capable of large hail. Storms may eventually cluster into a
    semi-organized system capable of localized wind damage later this
    evening.
    
    The severe thunderstorm watch area is approximately along and 80
    statute miles east and west of a line from 40 miles northeast of
    Gillette WY to 25 miles south of Akron CO. For a complete depiction
    of the watch see the associated watch outline update (WOUS64 KWNS
    WOU9).
    
    PRECAUTIONARY/PREPAREDNESS ACTIONS...
    
    REMEMBER...A Severe Thunderstorm Watch means conditions are
    favorable for severe thunderstorms in and close to the watch area.
    Persons in these areas should be on the lookout for threatening
    weather conditions and listen for later statements and possible
    warnings. Severe thunderstorms can and occasionally do produce
    tornadoes.
    
    &&
    
    OTHER WATCH INFORMATION...CONTINUE...WW 278...
    
    AVIATION...A few severe thunderstorms with hail surface and aloft to
    2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
    few cumulonimbi with maximum tops to 500. Mean storm motion vector
    28025.
    
    ...Guyer

    National Risk Overview

    Tuesday, July 17
    TORNADO: low
    HAIL: 15%
    WIND: 15%
    Wednesday, July 18
    ANY SEVERE: 15%
    Thursday, July 19
    ANY SEVERE: 5%
    Friday, July 20
    ANY SEVERE: low / uncertain
    Saturday, July 21
    ANY SEVERE: low / uncertain
    Sunday, July 22
    ANY SEVERE: low / uncertain
    Monday, July 23
    ANY SEVERE: low / uncertain
    Tuesday, July 24
    ANY SEVERE: low / uncertain

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