Severe Storm Outlook Narrative (AC)
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000
ACUS01 KWNS 220101
SWODY1
SPC AC 220059

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Fri Jul 21 2017

Valid 220100Z - 221200Z

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM NORTHERN
ILLINOIS INTO NORTHWEST INDIANA...

...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS
SOUTHEASTERN NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA...AS WELL AS
WEST CENTRAL MINNESOTA...

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS MUCH OF THE
NORTHERN PLAINS INTO THE MIDWEST...

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM THE CENTRAL
AND NORTHERN PLAINS INTO THE MIDWEST...

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS NORTHERN
MAINE...

...SUMMARY...
Scattered severe storms capable of damaging winds and hail remain
possible from eastern Iowa and southern Wisconsin across northern
Illinois into Indiana. Hail and localized strong wind gusts are
likely across North Dakota into northeast South Dakota, and
northwestern Minnesota.

...IA/IL/WI/IN...
A large cluster of storms continues to evolve across eastern IA into
northern IL, southern WI and northern IN, near a warm front.
Moderate instability will support some organization this evening,
supported by a southwesterly low-level jet, with scattered wind
damage possible. For more information see mesoscale discussion 1385.


...Eastern ND/SD into MN...
Pockets of strong instability remain across the region ahead of the
main cold front to the west. Several strong to severe storms are
scattered about, from near the MO river to the western shores of
Lake Superior. The most concentrated severe threat will be over
southeast ND into northern/northeast SD, with hail most likely. For
more information see mesoscale discussions 1384 and 1386.

...NE into IA...
An isolated severe storm persists across central NE, with 00Z Omaha
sounding showing a very unstable air mass still in place. A
conditional risk of wind or hail thus persists across NE into IA,
where some models do indicate isolated redevelopment is possible.

..Jewell.. 07/22/2017

$$



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