ACUS11 KWNS 312323
SWOMCD
SPC MCD 312322=20
ILZ000-IAZ000-MOZ000-010045-

Mesoscale Discussion 0993
NWS Storm Prediction Center Norman OK
0622 PM CDT Tue May 31 2022

Areas affected...portions of northeastern MO...southeastern IA and
northwestern IL

Concerning...Severe potential...Watch possible=20

Valid 312322Z - 010045Z

Probability of Watch Issuance...40 percent

SUMMARY...A few clusters of strong to severe storms will be possible
along and east of a slow moving cold front later this evening.
Damaging wind gusts and isolated hail appear to be the primary
threats. It remains unclear if a watch will be needed.

DISCUSSION...As of 2320Z, late afternoon visible imagery showed some enchantment to cumulus towers/weak thunderstorms along a slow moving
cold front from far northeastern MO into portions of southeastern
IA. Regional surface observations ahead of the developing convection
show a warm and moist airmass with surface TDs in the upper 60s to
low 70s F. Overlying the surface moisture, moderately steep
mid-level lapse rates near 7.5 C/km were supporting around 2000 J/kg
of MLCAPE. Lingering mid-level flow is also aiding in 30-40 kt of
effective shear suggesting some storm organization is possible.
Within the favorable parameter space, if convection is able to be
maintained, more organized multi-cell clusters and perhaps some
transient supercell structures capable of damaging wind gusts and
isolated hail will be possible. It remains unclear if and how many
organized severe storms may develop owing to weak forcing for ascent
and lingering cloud cover. Conditions will be monitored for the
possibility of a weather watch should storms continue to develop and
organize.

..Lyons/Hart.. 05/31/2022

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!8aMr9NIwRJ3ZKXCti1vePKxKr6MzV8XHriCFAu_KKl2a4sP_yKKaMwWNE5XO1jhANGjrY-rAn= 805nKbtzqXDU-h6a_g$ for graphic product...

ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...

LAT...LON 40019283 40669256 40929243 41519161 41579147 41829094
42248992 42258973 42168939 41998892 41598902 40908952
40049020 39489089 39379146 39319212 39489250 40019283=20


=3D =3D =3D
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ACUS11 KWNS 121631
SWOMCD
SPC MCD 121630=20
CTZ000-NYZ000-NJZ000-PAZ000-MDZ000-DEZ000-VAZ000-121730-

Mesoscale Discussion 0993
NWS Storm Prediction Center Norman OK
1130 AM CDT Mon Jun 12 2023

Areas affected...Portions of far southeast New York...eastern Pennsylvania...New Jersey...Delaware...eastern Maryland...far
eastern Virginia

Concerning...Severe potential...Watch possible=20

Valid 121630Z - 121730Z

Probability of Watch Issuance...40 percent

SUMMARY...The severe threat will gradually increase across portions
of the Mid Atlantic this afternoon. Damaging gusts are the main
concern, though an instance or two of large hail and perhaps a brief
tornado cannot be ruled out. A Severe Thunderstorm Watch issuance is
possible.

DISCUSSION...A corridor of insolation ahead of a broad stratiform
rain band (associated with an upper trough) has supported surface
temperatures rising into the upper 70s/lower 80s F, with upper 60s F
dewpoints contributing to 1000-2000 J/kg of thin MLCAPE (given poor
mid-level lapse rates). While increasing deep-layer ascent atop the
mixing boundary layer will support an increase in convective
coverage, deep-layer shear is expected to remain modest, with
slightly curved/elongated hodographs supporting multicellular
development amid 30 kts of effective bulk shear. With low-level
lapse rates steepening to over 7 C/km, damaging gusts appear to be
the main threat with the stronger storms. Given the modest hodograph
curvature, an instance or two of marginally severe hail is possible
and a tornado cannot be completely ruled out. Conditions will
continue to be monitored for corridors of locally stronger surface
heating, which may support enough coverage of damaging-gust
producing storms to warrant a Severe Thunderstorm Watch issuance.

..Squitieri/Thompson.. 06/12/2023

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!8kdzCVc0m2U0bAVsu4U5V8t18Im5Kcf4cHtJ8vm1B-1uYMKPWdFNOrbf-cu2BAMuUh3aA97ca= c7rDGIlWbq6Xn-YB5s$ for graphic product...

ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...LWX...

LAT...LON 36627772 38357657 40057573 41627472 41747413 41677385
41457366 40847375 40127406 39387455 38327515 37477568
36937599 36717619 36607679 36627772=20


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