


Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
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365 ACUS11 KWNS 120133 SWOMCD SPC MCD 120132 NEZ000-KSZ000-COZ000-WYZ000-120300- Mesoscale Discussion 1650 NWS Storm Prediction Center Norman OK 0832 PM CDT Fri Jul 11 2025 Areas affected...southeastern Wyoming...northeastern Colorado...western Nebraska Concerning...Severe Thunderstorm Watch 509... Valid 120132Z - 120300Z The severe weather threat for Severe Thunderstorm Watch 509 continues. SUMMARY...Threat for large hail and damaging wind continues in WW509. DISCUSSION...Outflow interactions from storms moving off of the high terrain has led to a steady increase in thunderstorm activity across northeastern Colorado into western Nebraska. Initial supercells have been efficient at producing 1-1.5 (occasionally 2") hail. As storms further congeal along outflow, the damaging wind risk may increase through the evening across eastern Colorado into northwest Kansas. Mode remains somewhat disorganized for now, with much of the activity north of the front. For now, more discrete convection will continue to pose a risk for large hail. ..Thornton.. 07/12/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...GLD...BOU...CYS... LAT...LON 40850527 41460502 41570467 41680346 41690255 41620210 41430170 41350154 41130127 40210135 39730186 39670304 40090483 40100496 40850527 MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN