Severe Storm Outlook Narrative (AC)
Issued by NWS
Issued by NWS
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800 ACUS01 KWNS 220043 SWODY1 SPC AC 220042 Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0742 PM CDT Sat Sep 21 2024 Valid 220100Z - 221200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE SOUTHERN HIGH PLAINS... ...SUMMARY... Scattered severe storms capable of all hazards remain possible this evening across portions of the southern High Plains. ...01z Update... Strong upper low has progressed into the Four Corners region early this evening as the primary mid-level speed max translates across southern NM. Large-scale ascent is now spreading across the southern High Plains, and scattered-numerous thunderstorms have evolved across eastern NM into the TX Panhandle. In response to the trough, LLJ should increase a bit over the next few hours, and continued clustering is expected, especially across the TX South Plains into the TX Panhandle. Additionally, several supercells persist within southeast upslope flow regime across eastern NM, south of the synoptic front. 00z sounding from MAF exhibits steep lapse rates with ample shear for supercells, though weak inhibition is noted around 2km. Large hail and damaging wind threat continues with this activity, along with some risk for tornadoes with more discrete supercells. ...Elsewhere... Southern influence of northern-stream short-wave trough is aiding multiple thunderstorm clusters across the upper Midwest. Low-level warm advection is also contributing to this activity, but thermodynamic profiles are not particularly impressive with mostly modest instability noted. Some risk for wind/hail will continue, especially for the next few hours. Boundary-layer cooling should contribute to weakening buoyancy across the Middle Atlantic region. Some risk for locally strong winds persist for the next 1-2hr but overall the severe risk is gradually waning. ..Darrow.. 09/22/2024 $$