Severe Thunderstorm Warning 190, NWS Hastings, NE

Area Forecast Discussion
National Weather Service Hastings NE
252 PM CDT Thu Jul 26 2018

.SHORT TERM...(This evening through Friday)
Issued at 245 PM CDT Thu Jul 26 2018

The Central Plains remains in a northwest flow pattern aloft in
between high pressure centered in the southwest CONUS and a closed
upper low in Ontario. At the surface, high pressure was building
south from the western Dakotas. As the morning convection in far
southern Nebraska and north central Kansas diminished, new
showers/storms developed across northern/central Nebraska and
western KS. Hit or miss showers/storms remain possible the
remainder of the day into tonight in weak mid level warm air
advection and the passage of a jet streak in the nw flow. The
brunt of convection will be focused to our west tonight aided by
upslope flow and these storms may try to work into our area
toward Friday morning.

The potential for showers/storms continues during the day Friday,
but confidence is not high on the coverage of activity as some
models suggest mainly dry conditions during the day while others
hold onto storm chances all day. While probably not a rain out
Friday based on CAMS, showers/storms may be around which could
affect outdoor activities, with a general model consensus with the
better chances during the day focused across our n/ne zones.
Should see a range in temps Friday with warmer air spreading into
our southern zones in return flow on the back side of the surface
ridge, with highs forecast in the mid 80s aided by a steady
southerly wind in deeper mixing, while to the north temps look to
remain below normal in the 70s in the cooler airmass with more
clouds and potential for precip.

While a strong storm cannot be ruled out at times tonight into the
day on Friday in a highly sheared environment, the main instability
axis resides to our west.

.LONG TERM...(Friday night through Thursday)
Issued at 245 PM CDT Thu Jul 26 2018

As has been mentioned for several days, thunderstorm chances ramp up
Friday evening/night. The storms are expected to initiate in the
moist, unstable axis along the high plains in eastern WY and eastern
CO, and track southeast in the northwest flow regime. The most
current SPC day 2 now outlines w/sw Neb in an enhanced risk for
severe, which extends into our far sw counties. The axis of
instability (to our west) of 2000-2500 j/kg combined with impressive
effective shear of 50-60kts will be favorable for supercell
development. As storms track to the southeast storms may organize to
a linear mode, with storms reaching our western zones primarily in
the late evening/overnight hours bringing a primary large
hail/damaging wind threat.

Storms are expected to depart overnight Friday night or Saturday
morning, with the remainder of the weekend and early next week
continuing to feature cool and intermittently wet conditions as an
upper trough deepens across the eastern plains. The trough axis
departs to the east heading into Tuesday, allowing for trend
toward drier weather and moderating temps mid week on, with a
pattern change as the western upper ridge rebuilds.

&&

.AVIATION...(For the 18Z KGRI/KEAR TAFS through 18Z Friday)
Issued at 1215 PM CDT Thu Jul 26 2018

An isolated thunderstorm has developed north of the terminals and
generally expect a hit or miss storm possible the remainder of the
day and into Friday. Could see some MVFR clouds on Friday, but
confidence is not high enough to introduce a ceiling. Otherwise,
look for wind speeds to remain fairly light/variable under the
influence of a surface ridge axis.

&&

.GID WATCHES/WARNINGS/ADVISORIES...
NE...None.
KS...None.

&&

SHORT TERM...Fay
LONG TERM...Fay
AVIATION...Fay

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Special Weather Statement
National Weather Service Hastings NE
1243 PM CDT THU JUL 26 2018

NEZ039-261815-
Valley NE-
1243 PM CDT THU JUL 26 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN VALLEY COUNTY UNTIL 115
PM CDT...

At 1242 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles east of Fort Hartsuff State Park to
near Burwell. Movement was southeast at 15 mph.

Penny size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Ord, Elyria and Fort Hartsuff State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4174 9876 4161 9876 4157 9921 4174 9921
TIME...MOT...LOC 1742Z 314DEG 15KT 4176 9886 4174 9912

Fay

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