Hazardous Weather Outlook
Issued by NWS Sioux Falls, SD

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FLUS43 KFSD 181004
HWOFSD

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
504 AM CDT Tue Jul 18 2017

IAZ012-020>022-031-032-NEZ013-014-SDZ050-063>071-191015-
Sioux-Plymouth-Cherokee-Buena Vista-Woodbury-Ida-Dixon-Dakota-
Gregory-Charles Mix-Douglas-Hutchinson-Turner-Lincoln SD-
Bon Homme-Yankton-Clay SD-Union-
504 AM CDT Tue Jul 18 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

Heat index values will once again approach 100 degrees in the
Missouri River Valley today.

Thunderstorms will be possible late this afternoon into this
evening. Best chances for storms will be east of the James River.
Hail to the size of half dollars, wind gusts to 65 mph, and an
isolated tornado will be possible with stronger storms. Heavy rain
will also be possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The combination of heat and humidity will persist through mid-week,
with heat index values in the 90s to near 105 across the area
through Wednesday.

Thunderstorms chances will arrive almost daily this week, bringing
a potential for isolated strong to severe storms, as well as
locally heavy rainfall, to parts of the region through Friday. The
primary risks in thunderstorms will be damaging winds, along with
a large hail threat.


.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely after 5 pm.

$$

SDZ038>040-052>054-057>060-191015-
Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner-Brule-Aurora-
Davison-Hanson-
504 AM CDT Tue Jul 18 2017

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

.DAY ONE...Today and Tonight

Thunderstorms will be possible this morning. An isolated storm may
produce hail to the size of quarters or wind gust to 60 mph.


.DAYS TWO THROUGH SEVEN...Wednesday through Monday

The chance for mainly nighttime thunderstorms will bring a
potential for isolated strong to severe storms, as well as locally
heavy rainfall, to parts of the region through Friday. Although
areas near and to the north of Interstate 90 are currently more
favored to see storms, timing and location are uncertain. At this
time, the greatest risks for strong thunderstorms are focused on
Wednesday afternoon and evening, and again by Friday.

While afternoon temperatures will ultimately depend on the extent
of overnight thunderstorm activity, heat index values in the 90s
to lower 100s will be possible at times through the upcoming
week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible through noon today.

$$

IAZ001>003-013-014-MNZ071-072-080-081-089-090-097-098-SDZ055-056-
061-062-191015-
Lyon IA-Osceola-Dickinson-O`Brien-Clay IA-Lincoln MN-Lyon MN-
Murray-Cottonwood-Nobles-Jackson-Pipestone-Rock-Lake-Moody-McCook-
Minnehaha-
504 AM CDT Tue Jul 18 2017

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

.DAY ONE...Today and Tonight

A complex of storms across northeast south Dakota may try to build
south through late morning into the early afternoon. Wind gusts
up to 60 mph and hail to the size of ping pong balls are possible
with the strongest storms. Heavy rainfall will also be possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Nearly daily thunderstorm chances through Friday may bring the
risk of locally heavy rainfall and pockets of severe weather.
 At this time, the greatest risks for strong thunderstorms are
focused on Tuesday afternoon, Wednesday afternoon and evening,
and again by Friday. Damaging winds and large hail will be the
primary risks.

While afternoon temperatures will ultimately depend on the extent
of overnight thunderstorm activity, heat index values in the 90s
to lower 100s will be possible across mainly northwest Iowa.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is likely after 10 am this morning.

$$



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