MD 0171 CONCERNING SEVERE POTENTIAL…WATCH UNLIKELY FOR PARTS OF PA…MD…DE…AND NJ
Mesoscale Discussion 0171 NWS Storm Prediction Center Norman OK 0101 PM CST Tue Feb 21 2023 Areas affected...Parts of PA...MD...DE...and NJ Concerning...Severe potential...Watch unlikely Valid 211901Z - 212000Z Probability of Watch Issuance...5 percent SUMMARY...Low-topped convection across parts of Pennsylvania, Maryland, Delaware, and New Jersey this afternoon may produce a damaging gust or two and some sub-severe hail. A watch is not anticipated. DISCUSSION...Showers with embedded low-topped convection are ongoing across southeast Pennsylvania this afternoon. Some breaks in the clouds ahead of this activity are apparent on visible satellite, and surface temperatures have warmed into the 50s to near 60F. Mesoanalysis and short-term RAP forecast soundings show weak, relatively shallow buoyancy, with MLCAPE in the 100-300 J/kg range, and steep lapse rates. Hodographs in the region are generally straight, though with appreciable deep-layer shear (40-50 kts of effective bulk shear). As time progresses, expect increased convective development given the surface heating. Given the strong low-level flow (50 kts at 850 mb), cells have the potential to produce a damaging gust or two. Additionally, due to the steep lapse rates and straight hodographs, the stronger cells may produce some sub-severe hail. Expect the convection to move eastward off the Delaware and New Jersey coasts by 22-23Z. ..Supinie/Weinman/Guyer.. 02/21/2023 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...PHI...BGM...AKQ...CTP...LWX... LAT...LON 38837725 39297742 40017740 40377727 40777708 40947668 40937641 40927578 40827533 40757493 40197422 39857402 39487409 39167440 38907477 38667509 38577535 38507584 38477626 38707698 38837725