|Mesoscale Discussion 754|
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Mesoscale Discussion 0754
NWS Storm Prediction Center Norman OK
0945 PM CDT Wed May 17 2017
Areas affected...northeast IL
Concerning...Severe potential...Watch possible
Valid 180245Z - 180345Z
Probability of Watch Issuance...40 percent
SUMMARY...The squall line over northwest IL will move into northeast
IL later this evening. Isolated severe gusts are possible.
DISCUSSION...Radar mosaic shows a broken line of cells to the east
of the Quad Cities with a continuous squall line over parts of
northern IL into south-central WI. The boundary layer has been slow
to cool this evening in part to considerable mixing with
temperatures slowly falling from the upper 70s into the middle 70s
degrees F and dewpoints are around 60 F. The KLOT VAD has shown an
increase in 0.5-2.0 km flow and hodographs have become quite large.
Although the tornado risk is thought to be low, a nonzero risk for a
brief/weak tornado may accompany any updraft with persistent
rotation. Isolated gusts 50-65 mph are possible with the stronger
downdrafts which would result in wind damage.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 42448863 42458778 41788770 41348795 41148859 42448863
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