Hazardous Weather Outlook
Issued by NWS Sioux Falls, SD

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FLUS43 KFSD 190438
HWOFSD

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
1138 PM CDT Mon Sep 18 2017

IAZ002-003-012>014-020>022-031-032-MNZ081-089-090-NEZ013-014-
SDZ071-200445-
Osceola-Dickinson-Sioux-O`Brien-Clay IA-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Cottonwood-Nobles-Jackson-Dixon-Dakota-
Union-
1138 PM CDT Mon Sep 18 2017

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

.DAY ONE...Tonight

Fog will gradually become more widespread tonight. Patchy dense
fog will be possible.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms are expected to form across central South Dakota
late Tuesday afternoon and race eastward towards Minnesota and
Iowa overnight. There is potential for scattered strong to severe
thunderstorms, with the highest potential for severe storms along
and west of Interstate 29. Uncertainty remains as to the track of
thunderstorm activity, so continue to monitor your local forecast.

Thunderstorm chances return by Friday and continue into next
weekend. The risk for severe storms is uncertain at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed tonight.

$$

IAZ001-MNZ071-072-080-097-098-SDZ038>040-050-052>070-200445-
Lyon IA-Lincoln MN-Lyon MN-Murray-Pipestone-Rock-Beadle-Kingsbury-
Brookings-Gregory-Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-
Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-
Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-
1138 PM CDT Mon Sep 18 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...Tonight

Areas of fog will gradually develop later tonight through early
Tuesday morning. A few spots east of the James River could find
some dense fog later tonight and early Tuesday morning.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered thunderstorms are expected to form along a fast moving
cold front over central South Dakota Tuesday afternoon. These
thunderstorms may quickly form into a line and race eastward
towards Minnesota and Iowa by early Wednesday.

At this time, the greatest severe weather risk may be found along
and west of a line from Marshall to Worthington and Sioux City.
Damaging winds as high as 70 mph and hail up to golf ball size
will be the primary risks, however, conditions may also be
favorable for a tornado risk through the evening hours. Continue
to monitor your local forecast as uncertainty in the forecast
remains.

Thunderstorm risks will return by Friday and continue into next
weekend. At this time, it is too early to determine a severe
weather risk. However, there may be an elevated heavy rainfall
risk.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Tuesday evening.

$$


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