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Severe WX Severe Weather Thread - 6/15/26 - 6/18/26

Looks like IWX is remaining vigilant on their messaging despite SPC dropping probs around here:

147 PM EDT Wed Jun 17 2026

.KEY MESSAGES...

- Two rounds of storms are expected today (1-5pm EDT and
5pm-12am EDT). There is a low chance of severe weather with
the first round and a much higher chance with the second
round.

- All hazards will be possible across the entire area with round
2 including strong tornadoes, large hail, damaging winds and
flooding. A flood watch is in effect for areas along and north
of US-24.

"An MCS moving in from Illinois is currently moving into the
region and acting to hold the warm front and better instability
south of the area. However, as this weakens this afternoon, a
strong surge of warm/moist air advection will push northward.
Thunderstorms over central Illinois will then stream in from the
southwest around 20Z. This will be the beginning of what we have
previously been referring to as "round 2" of storms with a
significant severe potential, especially damaging winds and
tornadoes. The greatest threat for severe weather will
generally be south of US-30 as a strong cold front comes in
22-23Z. This will be accompanied by extreme wind shear and
effective SRH on the order of 900 m2/s2. It will be important to
remain vigilant given the potential for strong tornadoes. Also,
while the highest tornado probabilities remain south of US-30
and west of I-69 where better instability resides, with the warm
front approaching the Michigan border where the better helicity
exists, the tornado threat could be just as high or higher if
any minor instability develops there. In addition to the tornado
threat, will also have to watch potential for wake low
development which could bring damaging winds behind the line of
storms into the late evening. Regardless of wake low
development, it will be breezy into the overnight and on
Thursday. Hail threat is a bit lower today given poor lapse
rates but any organized supercell will still be capable of
generating some large hail."
 
MESOSCALE DISCUSSION 1165
NWS STORM PREDICTION CENTER NORMAN OK
0103 PM CDT WED JUN 17 2026

AREAS AFFECTED...PORTIONS OF NORTHERN/CENTRAL MISSOURI...WESTERN
ILLINOIS

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 171803Z - 172000Z

PROBABILITY OF WATCH ISSUANCE...95 PERCENT

SUMMARY...THUNDERSTORM DEVELOPMENT LIKELY BY THE AFTERNOON WITH
POTENTIAL FOR ALL HAZARDS INCLUDING DAMAGING WIND, LARGE HAIL, AND
STRONG TORNADOES.

DISCUSSION...MORNING CONVECTION HAS MOVED INTO CENTRAL/EASTERN
ILLINOIS, WITH TRAILING OUTFLOW AND A ZONE OF DIFFERENTIAL HEATING
EXTENDING ACROSS NORTHERN MISSOURI INTO SOUTH-CENTRAL ILLINOIS. THIS
ZONE WILL BE THE FOCUS OF REDEVELOPMENT OF THUNDERSTORM ACTIVITY
THIS AFTERNOON. STRONG DAYTIME HEATING IS ONGOING ACROSS
CENTRAL/NORTHERN MISSOURI INTO FAR WESTERN ILLINOIS IN THE CLOUD
FREE ZONE SOUTH OF THE OUTFLOW. SPC MESOANALYSIS INDICATES THAT
MLCIN IS ERODING IN THIS REGION, WITH TEMPERATURES CLIMBING INTO THE
MID 80S F. THIS IS FURTHER CONFIRMED BY VISIBLE SATELLITE TRENDS
WITH THE CUMULUS NEAR THE VICINITY OF THE OUTFLOW ALSO BECOMING
INCREASINGLY AGITATED.

STRONG DEEP LAYER SHEAR AROUND 50-55 KTS IS ANALYZED ACROSS THIS
REGION, WITH STP AROUND 2-3 ACROSS NORTHERN MISSOURI INTO FAR
WESTERN ILLINOIS. THIS IN COMBINATION WITH STRONG TO MODERATE
INSTABILITY EDGING NORTHWARD WILL LIKELY SUPPORT INITIAL SUPERCELLS
CAPABLE OF LARGE HAIL, DAMAGING WIND, AND TORNADOES (PERHAPS
STRONG). A 40-50 KT LOW LEVEL JET AXIS EXTENDS FROM THE
SOUTHERN/CENTRAL PLAINS INTO MISSOURI/WESTERN ILLINOIS. THIS IS
PROGGED TO SHIFT NORTH AND EASTWARD THROUGH THE AFTERNOON, WHICH MAY
SHIFT THE HIGHER STP AND MORE FAVORABLE TORNADO POTENTIAL INTO
PORTIONS OF WESTERN/CENTRAL ILLINOIS.

ONE OR MORE WATCHES WILL LIKELY BE NEEDED TO COVER THIS POTENTIAL
THIS AFTERNOON.

..THORNTON/HART.. 06/17/2026

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