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ACUS11 KWNS 290322
SWOMCD
SPC MCD 290321
MNZ000-NDZ000-SDZ000-290445-
Mesoscale Discussion 0934
NWS Storm Prediction Center Norman OK
1021 PM CDT Thu Jun 28 2018
Areas affected...Much of ND...Extreme Northern SD...Northwest MN
Concerning...Severe potential...Severe Thunderstorm Watch likely
Valid 290321Z - 290445Z
Probability of Watch Issuance...95 percent
SUMMARY...Strong wind gusts, and perhaps a few tornadoes, will
remain possible across much of ND and into northwest MN over the
next several hours. A new watch will be needed to cover these
potential hazards.
DISCUSSION...Well-organized convective line currently moving through
northwest ND is expected to continue progressing quickly eastward
across northern/central ND and eventually into far northwest MN
later tonight. Current motion estimates have the line moving east at
about 45 kt. Severe gusts have been measured at several sites as
this line has moved through, including 55 kt at SDY and 59 kt at
ISN. There is also some potential for the discrete storms across
southeast MT to grow upscale into another organized MCS that moves
generally eastward.
Continued low-level moisture advection supported by the
strengthening low-level jet and the presence of moderate to strong
instability will help maintain storm intensity as it progresses
eastward. Primary severe hazard will be severe wind gusts, with
isolated instances of winds greater than 64 kt possible. Given the
strong low-level flow and potential for outflow surges within the
convective line, a few QLCS tornadoes are also possible,
particularly near the warm front. Given this anticipated threat, a replacement/new watch will be needed across much of ND and into
northwest MN before 04Z.
..Mosier/Edwards.. 06/29/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...FGF...ABR...BIS...UNR...
LAT...LON 48650385 49000224 48959964 48619647 48019495 46259590
45720240 46320394 48650385
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