Hazardous Weather Outlook
Issued by NWS Sioux Falls, SD

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FLUS43 KFSD 191056
HWOFSD

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
556 AM CDT Tue Sep 19 2017

IAZ001-002-MNZ071-072-080-081-089-090-097-098-SDZ038>040-052>062-
064>067-201100-
Lyon IA-Osceola-Lincoln MN-Lyon MN-Murray-Cottonwood-Nobles-
Jackson-Pipestone-Rock-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-
Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Douglas-Hutchinson-Turner-Lincoln SD-
556 AM CDT Tue Sep 19 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
southwest Minnesota, central South Dakota, east central South
Dakota, south central South Dakota, and southeast South Dakota.

.DAY ONE...Today and Tonight

Scattered thunderstorms should begin to develop by very late
afternoon or early evening west along a line from Chamberlain to
Huron, then progress along with a frontal boundary as it slides
eastward through the overnight. Initially, storms will be discrete
with the risk of hail up to golf ball size, winds to 70 mph,
and even an isolated stronger tornado.  Storms should transition
during the evening toward more linear or bowing structures, with
somewhat lesser hail size threat, but damaging wind potential to
around 80 mph along with a continued tornado threat well after
dark, even into southwest Minnesota toward midnight.

In general, the chance for storms increases heading farther north
from Interstate 90 this evening, with the greatest chances from
Huron to Marshall. This is a potential severe weather event much
more typical of July than September.

Otherwise, there could be a few spots of dense fog mainly from the
James valley eastward early this morning. Fog should dissipate by
mid morning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorm risks will return by Friday and continue into next
weekend. At this time, it is too early to determine the exact
location for a severe weather risk, but a few strong to severe
storms are likely during this period. An elevated heavy rainfall
risk will also be present from Friday night through Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely from 6 pm to 1 am for many areas north
of Interstate 90, and possible near and south of Interstate 90.

$$

IAZ003-012>014-020>022-031-032-NEZ013-014-SDZ050-063-068>071-
201100-
Dickinson-Sioux-O`Brien-Clay IA-Plymouth-Cherokee-Buena Vista-
Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Bon Homme-Yankton-
Clay SD-Union-
556 AM CDT Tue Sep 19 2017

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, northeast Nebraska, south central South
Dakota, and southeast South Dakota.

.DAY ONE...Today and Tonight

Risk for a few thunderstorms will begin toward south central
South Dakota by early evening, spreading quickly eastward into
northwest Iowa in the early overnight hours. This is a very
conditional risk for severe weather, as any storms that manage to
develop as far south as the Missouri River corridor would have
potential for large hail and damaging winds.

Otherwise, there could be a few spots of dense fog mainly from the
James valley eastward early this morning. Fog should dissipate by
mid morning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorm chances return by later Friday and continue at times
through next weekend. The risk for severe storms remains somewhat
uncertain at this time, but there is likely the threat for some
areas of heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible between 7 pm and 1 am tonight.

$$


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