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ACUS11 KWNS 200550
SWOMCD
SPC MCD 200550
MIZ000-200645-
Mesoscale Discussion 1536
NWS Storm Prediction Center Norman OK
1250 AM CDT Sat Jul 20 2019
Areas affected...Portions of Lower MI
Concerning...Severe Thunderstorm Watch 526...
Valid 200550Z - 200645Z
The severe weather threat for Severe Thunderstorm Watch 526
continues.
SUMMARY...Isolated damaging wind threat continues across parts of
Lower MI. Greatest threat area appears to be over parts of
southwestern Lower MI in the next hour or so, including Grand
Rapids.
DISCUSSION...The northern portion of a long-lived bow echo has
rapidly weakened across northern/central parts of Lower MI. However,
recent radar trends have shown a slight uptick in convective
intensity within the southern flank of the line across portions of
southwestern Lower MI. Even with some convective inhibition present,
strong (40-50+ kt) inbound velocities noted on the KGRR radar should
be capable of reaching the surface in the short term given the
presence of a very moist low-level airmass and related moderate to
strong instability. It remains unclear how far south this isolated
damaging wind threat will extend, but given current observational
trends this threat should continue for at least the next hour or so.
But, overall gradual weakening should occur as the line approaches
the MI/IN border.
..Gleason.. 07/20/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DTX...APX...GRR...
LAT...LON 42158506 42158587 42508650 43058700 43218613 43418550
43908508 44458491 44718468 44658435 44448407 43848405
42788443 42158506
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