


Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
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220 ACUS11 KWNS 290947 SWOMCD SPC MCD 290947 IAZ000-291215- Mesoscale Discussion 1505 NWS Storm Prediction Center Norman OK 0447 AM CDT Sun Jun 29 2025 Areas affected...Northwest and Central Iowa Concerning...Severe potential...Watch unlikely Valid 290947Z - 291215Z Probability of Watch Issuance...20 percent SUMMARY...Isolated severe wind gusts will be possible across parts of northwest and central Iowa early this morning. Due to the marginal nature of the threat, the chance of an additional weather watch appears low. DISCUSSION...The latest radar imagery from Sioux Falls, South Dakota shows a bowing line segment across far northwest Iowa, which is located along a northwest-to-southeast gradient of moderate instability. Near this area over northwest Iowa, the RAP suggests that 700-500 mb lapse rates are 8 to 8.5 C/km. This will likely help maintain an isolated wind-damage threat over the next couple of hours over northwest and central Iowa. Also, forecast soundings have a sharp temperature inversion in the low-levels from the surface to about 900 mb. This factor, along with decreasing instability, should make any severe threat increasingly marginal with time. ..Broyles/Smith.. 06/29/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...FSD...OAX... LAT...LON 43129560 42269598 41899598 41639562 41479500 41549368 42289323 42899347 43249438 43129560 MOST PROBABLE PEAK WIND GUST...55-70 MPH