Special Weather Statement, NWS Goodland, KS

Area Forecast Discussion
National Weather Service Goodland KS
609 PM MDT Fri Aug 2 2019

.SHORT TERM...(This evening through Saturday Night)
Issued at 205 PM MDT Fri Aug 2 2019

An upper ridge continued to be the dominant feature today, spanning
across the western half of the CONUS and placing the High Plains
under northwest flow aloft. Its anticyclone remained centered over
eastern Arizona and western New Mexico. Moisture filtered into the
region around a surface low located just southeast of the area, with
light and variable winds observed. Fog and low clouds stuck around
across much of the region through mid morning before slowly breaking
up and decreasing from west to east. At 1 PM MDT (2 PM CDT)
temperatures ranged in the upper 70s to low 80s. A few thunderstorms
developed in southwest Nebraska near Interstate 80.

A few thunderstorms are possible through the evening hours as weak
waves rotate around the surface low near the region. Best chances
remain east of the Colorado border. Shear of 20 to 30 knots and
sufficient CAPE suggest that a strong to severe thunderstorm cannot
be ruled out. However, marginal lapse rates and weak forcing are
limiting factors and widespread severe weather is not expected.

Beyond thunderstorm chances, the concern for tonight is a return of
low clouds and fog. Guidance suggests similar conditions to those
observed this morning. Am anticipating cloud cover to spread back
across the region from east to west late this evening through the
overnight hours. Fog will redevelop as well, with the potential for
visibilities of a half mile or less. Conditions should improve mid
morning Saturday onward. Meanwhile, temperatures fall into the 60s
tonight.

The upper ridge over the Rockies builds east somewhat on Saturday as
the aforementioned surface low travels away from the area. Dry
conditions are forecast with high temperatures in the 80s.
Confidence in the temperature forecast is low at this time due to
uncertainty in how quickly fog/stratus will dissipate. Temperatures
fall into the low 60s Saturday night.

.LONG TERM...(Sunday through Friday)
Issued at 205 PM MDT Fri Aug 2 2019

For this long-term forecast period, the main story will be an
increase in thunderstorm activity as a result of an active upper
level pattern. In fact, basically every day during the period comes
with a chance for thunderstorms. In addition, there are some
forecast guidance differences in temperatures but overall anticipate
temps to be near to slightly above normal. However, this depends on
any potential fronts that may slide through the area so we could
easily observe below normal temperatures. This would align with the
Climate Prediction Center's forecast of below normal temperatures
from the intersection of Colorado, Nebraska, and Kansas southeast
toward Hays, KS.

There are a few time periods that need to be monitored closely,
particularly for severe weather potential. The first is Monday
afternoon and evening. Instability shall be on the rise with SBCape
of 1500-2000 j/kg and lapse rates of 7-8 C/km. In addition, 0-6 km
bulk shear increases to 30-40 kts. Most global guidance indicates a
relatively strong shortwave trough passing through which should
cause storms to ignite in the northwest flow pattern. CIPS analog
guidance shows that severe weather events have been noted across the
High Plains within this setup (from the Black Hills south through
western Kansas).

The second day to watch would be Tuesday afternoon and evening. The
overall atmospheric pattern is the same with northwest flow
prevailing over the High Plains. One interesting note is that
stronger instability is projected for Tuesday (potentially upwards
of 2500 J/kg of SBCape). In addition, shear is even stronger with 0-
6 km bulk shear approaching 45 kts. With these parameters in mind,
would not be surprised to see yet another round of severe
thunderstorms moving across the High Plains. Where remains the
biggest question along with how will the environment recover after
Monday's storms. These questions will be resolved as we get closer
to the forecast period and confidence grows in the mesoscale
features.

As mentioned above, active weather looks to continue next week
although forecast guidance starts to diverge from a more consistent
signal by Wednesday. For now, will not dive into the details on
severe potential as there is much to be resolved.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 442 PM MDT Fri Aug 2 2019

GLD will see VFR conditions through the 00Z TAF period with
scattered to broken low to mid level clouds and light winds.

MCK will start out VFR and transition to MVFR between 09-11Z as
low clouds become more widespread and form low ceilings. A drop to
IFR and LIFR is possible as ceilings continue to drop along with
visibilities that could be less than one mile at times between
12-15Z. Conditions will return to VFR after 15Z as low clouds
break up and visibilities improve rapidly.

&&

.GLD WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
CO...NONE.
NE...NONE.
&&

SHORT TERM...JBH
LONG TERM...RRH
AVIATION...LOCKHART

Hazardous Weather Outlook
National Weather Service Goodland KS
237 PM MDT Fri Aug 2 2019

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-032045-
Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins-
Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-
Greeley-Wichita-Dundy-Hitchcock-Red Willow-
237 PM MDT Fri Aug 2 2019 /337 PM CDT Fri Aug 2 2019/

This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

A few thunderstorms will be possible this afternoon and evening,
mainly in southwest Nebraska and northwest Kansas. A strong to
severe storm cannot be ruled out.

Fog will redevelop across much of the region after midnight.
Visibilities of a half mile or less will be possible.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH FRIDAY...

Fog is anticipated to reduce visibilities into Saturday before
dissipating mid to late morning.

A few strong to severe thunderstorms will be possible on Monday and
Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and early evening.

Special Weather Statement
National Weather Service Goodland KS
828 PM CDT Fri Aug 2 2019

NEZ081-030145-
Red Willow NE-
828 PM CDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN RED WILLOW COUNTY UNTIL
845 PM CDT...

At 828 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles southwest of Stockville to 4 miles
east of Medicine Creek Reservoir State Recreation Area. Movement was
south at 35 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
these storms.

These storms will remain over mainly rural areas of northern Red
Willow County.

LAT...LON 4029 10020 4030 10072 4035 10072 4035 10020
TIME...MOT...LOC 0128Z 001DEG 29KT 4043 10056 4042 10017

Lundquist

Special Weather Statement
National Weather Service Goodland KS
836 PM CDT Fri Aug 2 2019

NEZ081-030200-
Red Willow NE-
836 PM CDT Fri Aug 2 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN RED WILLOW COUNTY UNTIL
900 PM CDT...

At 836 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles southwest of Stockville to 7 miles
north of Holbrook. Movement was south at 30 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
McCook, Indianola and Bartley.

LAT...LON 4016 10019 4015 10064 4035 10066 4035 10020
TIME...MOT...LOC 0136Z 342DEG 26KT 4040 10057 4040 10006

Lundquist

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