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Severe POSS SEVERE WEATHER STARTING 05-17-2019 and BEYOND

FIRE DEPT CONFIRMS TORNADO NORTH OF LEBANON NEAR THE OK/MO BORDER MOVING TOWARD TIFF CITY AMD HART
 
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The size of the tornado that went through Jefferson City was amazing. Crazy how yesterday was worse than Monday when Monday's threat received all the hype beforehand. Yesterday went from a 0 to a 10 in just a couple of hours.
 
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Mesoscale Discussion 0753
NWS Storm Prediction Center Norman OK
0147 PM CDT Thu May 23 2019

Areas affected...TX Panhandle...Far Western OK

Concerning...Severe potential...Watch likely

Valid 231847Z - 232045Z

Probability of Watch Issuance...95 percent

SUMMARY...Supercell thunderstorms capable of all severe hazards,
including very large hail and tornadoes, are expected to develop
across the TX Panhandle this afternoon.

DISCUSSION...Based on the wind fields in the 18Z observations a
triple point/surface low exists just west of AMA with the thermal
fields indicating a dryline extends southwestward to HOB. Another
low appears to exist northeast of AMA (near BGD), with a warm front
extending northeastward to the central KS/OK border. Strong moisture
convergence continues in the vicinity of AMA as the composite
outflow/cold front continues to sag slowly southeastward while
strong southeasterly surface winds and moisture advection continues
south of it.

The air mass along and south/east of these boundaries continues to
destabilize. Cumulus field across east-central NM/western TX
Panhandle continues to deepen and the 18Z AMA sounding shows very
little convective inhibition remaining. Overall expectation is for
convective initiation to occur around 20Z. An initially discrete
mode is anticipated, with supercells capable of all severe hazards
likely. Tornadoes and very large hail (i.e. greater than 2" in
diameter) may occur, particularly as storms move east/northeastward
into the central and eastern TX Panhandle where surface winds are
more southeasterly. Given the strength of the low-level shear, a
strong, long-track tornado may occur if storms are able to remain
discrete enough and do not grow upscale.
 
Another one for northern OK and southern KS.

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Mesoscale Discussion 0752
NWS Storm Prediction Center Norman OK
0142 PM CDT Thu May 23 2019

Areas affected...Southern Kansas and Northern Oklahoma

Concerning...Severe potential...Watch likely

Valid 231842Z - 231945Z

Probability of Watch Issuance...80 percent

SUMMARY...Convective initiation occurring along/south of a warm
front. Large hail is the primary threat, and a few tornadoes are
possible south/near the front. Watch likely, though timing
uncertain.

DISCUSSION...Regional surface observations and objective
mesoanalysis shows an east/west oriented warm front over the
northern tier of counties in Oklahoma, moving quickly northward, on
the precipice of entering southern Kansas. Regional satellite shows
boundary-layer cumulus developing along the front and steadily
obtaining greater vertical depth. Regional radar shows weak echoes
with this activity. It appears this will be a mechanism for
convective development over the next few hours. Storms that develop
along the front should become quickly elevated, although any storms
that linger or are able to ride along the boundary could pose a
tornado threat. However, the thermodynamic/kinematic environment
north of the boundary is quite support of large hail (MUCAPE
2000-2500 J/kg and effective shear 50-55 kt).

South of the warm front, additional convective development is
possible in the warm sector. Here, temperatures are in the low 80s F
with dew points in the low 70s F. Any storms that develop here will
also pose a large hail threat. A tornado threat will also exist with
this activity that resides in the warm sector or as it crosses the
warm front.

A watch is being considered for this region, however the timing of
watch issuance remains uncertain.
 
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