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Severe Weather Threat May 17-19, 2025

Mesoscale Discussion 0872
NWS Storm Prediction Center Norman OK
1141 PM CDT Sun May 18 2025

Areas affected...South-central Kansas

Concerning...Tornado Watch 291...

Valid 190441Z - 190645Z

The severe weather threat for Tornado Watch 291 continues.

SUMMARY...A tornado threat will continue across parts of
south-central Kansas over the next couple of hours. A strong tornado
will be likely, and an EF3+ tornado could occur.

DISCUSSION...An intense tornadic supercell is ongoing about 50
statute miles to the west-northwest of Wichita, KS. This storm is
located just to the east of an axis of moderate instability, where
the RAP is analyzing MLCAPE in the 3000 to 4000 J/kg range. This
supercell is also located just to the southwest of the center of a
50 to 60 knot low-level jet. The low-level jet is creating very
strong low-level shear, which is being sampled by the WSR-88D VWP at
Wichita. This is creating a long looped hodograph and 0-3 km
storm-relative helicity of near 650 m2/s2. This environment will be
favorable for tornadoes, and a EF3+ tornado will be possible. In
addition to the tornado threat, forecast soundings have 700-500 mb
lapse rates near 8 C/km, which will be favorable for large hail.
Hailstones of greater than 2 inches in diameter may also accompany
the more intense cores.
 
It's toward the edge of the instability axis; strong nocturnal capping won't kill it since it has an established self sustaining low level inflow, but running beyond the instability axis eventually will, though perhaps not soon. Also note the insane effective helicity with the strong backing we have after dark

Screenshot 2025-05-18 234842.pngScreenshot 2025-05-18 234904.png
 
View attachment 42455
155-190mph makes a return, Christ almighty.
Not to be this person, and it probably doesn’t matter much, but I find the language in this discussion to be too conservative given we’ve seen them use violent tornado language before in similar situations.

The environment this cell is in is as high-end as April 27, 2011, and the signature on radar suggests a possible EF-5.

They would be well within their right to say that violent tornadoes are possible or even likely over the next hour or two.
 
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