Red Box nearby.
Mesoscale Discussion 0852
NWS Storm Prediction Center Norman OK
1202 PM CDT Tue May 28 2019
Areas affected...portions of the Mid-Atlantic into the Northeast
Concerning...Severe potential...Tornado Watch likely
Valid 281702Z - 281900Z
Probability of Watch Issuance...95 percent
SUMMARY...Storms are expected to develop this afternoon and will
likely become severe. Large hail, damaging wind gusts, and a few
tornadoes are possible. A tornado watch will likely be issued in the
next couple of hours.
DISCUSSION...A belt of enhanced mid-level westerly flow of 50-70
knots is stretching across the Great Lakes into the
Mid-Atlantic/Northeast. A shortwave trough embedded within this
zonal flow currently entering the Great Lakes region will move
eastward throughout the day helping to provide forcing for ascent
and strengthen deep layer shear. A surface low is located just
east-southeast of Buffalo, NY with a warm front stretching to the
southeast through northeast PA and central NJ. This warm front
should lift east-northeast with the surface low forecast to track
generally eastward. The Cu field is becoming increasingly agitated
within the warm sector and storms are likely to develop in the next
couple of hours.
Storms are likely to develop across west/central PA and move
east-southeast during the afternoon and evening into portions of
NJ/MD/DE/southern NY. Supercell development is likely and few storms
may remain discrete. Low-level veering is better to south/east
across the region, but flow/shear is stronger farther to the north.
Large hail is possible given forecast MLCAPE of 1500-3000 J/kg and
effective bulk shear of 35-50 knots. Additionally, strong synoptic
winds and steepening low-level lapse rates, especially where strong
insolation occurs, will increase the severe wind threat. Tornadoes
are possible as well, especially for storms that exhibit more
southeast movement, which will maximize SRH per observed/forecast
soundings.
..Nauslar/Thompson.. 05/28/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OKX...PHI...BGM...AKQ...BUF...CTP...LWX...PBZ...
CLE...
LAT...LON 39767949 39848040 40378054 40878056 41458043 41818024
42007982 42057791 41957629 41447465 41257439 40837422
40457419 39887453 38977511 38587554 39077680 39307738
39767949