Mesoscale Discussion 0776
NWS Storm Prediction Center Norman OK
0630 AM CDT Fri May 19 2017
Areas affected...Southern Illinois
Concerning...Severe Thunderstorm Watch 245...
Valid 191130Z - 191300Z
The severe weather threat for Severe Thunderstorm Watch 245
SUMMARY...A few strong wind gusts remain possible, but a weakening
trend is expected this morning.
DISCUSSION...A line of severe storms with damaging winds passed
through the St. Louis area with measured severe gusts which persist
across the river. The main threat for severe wind gusts should be
along and south of the main e-w oriented synoptic front, which has
also been reinforced by outflow. North of this boundary,
temperatures are only in the 50s, with northeast winds. To the
south, a much warmer air mass remains at the surface, supportive of
stronger winds reaching the surface.
Recent radar trends suggest weakening is beginning to take place,
and, the possible threat area is dwindling in size. Therefore, a new
watch may not be required in the short term.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 39338974 39408799 39168770 38868759 38508777 38278878
38178957 38338968 38578955 39198963 39338974