Severe Thunderstorm Warning 152, NWS Topeka, KS

Area Forecast Discussion
National Weather Service Topeka KS
1112 PM CDT Thu Jun 20 2019

...Update to aviation forecast discussion...

.SHORT TERM...(This evening through Friday)
Issued at 349 PM CDT Thu Jun 20 2019

Main focus in the short-term will be chances for thunderstorms and
the timing of convective activity across the area.

The upper level pattern is characterized by a trough of low pressure
over the northwestern CONUS and slight mid and upper level ridging
over the central Plains. A broad area of surface low pressure was
located over the Colorado Rockies/Four Corners region. Closer to
home, skies remained clear as temperatures warmed into the upper
80s and low 90s over northeastern KS this afternoon. Dewpoints as
of mid-afternoon were holding in the mid to upper 60s for much of
the area with low 70 degree dewpoints located primarily over the
southeastern quadrant of the state. Most of the evening hours are
expected to remain dry with the best chance for convective
initation occurring near the KS/NE border. If storms are able to
get going, all modes of severe weather will be possible given that
instability has reached 3000+ J/kg of CAPE and effective bulk
shear values exceed 50 kts in northeastern KS.

The better chance for thunderstorms across the CWA will occur during
the overnight hours. CAMS model guidance has come into better
agreement with a squall line of storms developing over northwestern
KS as a nocturnal low level jet increases and interacts with an
area of low pressure and associated surface boundary located near
the NE border. The primary hazards with the storms overnight will
be strong winds and hail. Storms should exit the area by mid-
morning tomorrow.

Attention then turns to very hot conditions developing tomorrow.
Temperatures will soar into the low 90s by the mid-afternoon hours.
When combined with ample low level moisture and surface dewpoints in
the low to mid 70s, the heat index will increase to near 100 degrees
for a few hours during prime heating. Current thinking is that
rain and storm chances will remain very low throughout the day and
evening hours of Friday. Additionally, the better chances for
thunderstorms overnight into Saturday look to remain north of the
area.

.LONG TERM...(Friday night through Thursday)
Issued at 349 PM CDT Thu Jun 20 2019

Active weekend in store as seasonably strong short-wave trough
expected to move from Utah Saturday morning to western Kansas by
Sunday evening.  Deepening surface low ahead of upper trough will
continue to draw very high theta-e air in the boundary layer
northward into eastern Kansas.  MLCAPE values forecast to be in
excess of 5000 J/kg by late Saturday afternoon with little (if any)
convective inhibition.  One key question is how far west storms will
initiate. In general prefer GFS positioning of surface features as
it seems NAM pushes weak surface high too far south and east given
approach of upper trough. Once storms form, some will likely become
severe, although mid-level winds and deep-layer shear are somewhat
marginal. Probably will see mostly outflow-dominated storms,
although could be a narrow window/corridor where better shear to
west becomes roughly co-located with better instability. Surface
dewpoints in the low 70s and precipitable water values nearing 2"
should set the stage for efficient rain-producing storms.  Wouldn't
be surprised if flood highlights are eventually needed for late
Saturday and possibly Sunday.

Primary question for Sunday seems to be where effective boundary
will set up.  Not surprisingly, NAM is more aggressive in pushing
(and keeping) boundary to the southeast with the rain-cooled air
from Saturday night's activity.  GFS allows airmass to recover again
with axis of mid-level trough still over eastern Colorado by midday
Sunday.  At this point will play middle-of-the-road scenario and
carry highest PoPs in the east.  If GFS scenario is correct, heavy
rain threat will be present again with very moist airmass in place.

Cooler, drier weather expected Monday as upper trough lifts to the
northeast.  Could see some warm-advection activity again by Tuesday
night as mid-level heights rise.  Summer-like ridging starting to
build in by Wednesday which should mostly shut off any organized
precip chances.

Should also mention heat potential for Saturday.  Some convective
cloudiness debris may keep temps in check a bit, but highs near 90
and dewpoints in low 70s yield heat indices around 100.  That's
below advisory criteria, but warmest of season so far, so will
continue to keep this as part of the forecast message.

&&

.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1102 PM CDT Thu Jun 20 2019

Increasing high clouds in advance of a TSRA cluster with
uncertainties lingering on how far south and east it will impact
terminals. Current radar and short term models are trending a bit
later in timing with MVFR cigs and scattered TSRA in the 11Z to
13Z time frame onset for all sites. There is a possibility for
light showers and MVFR stratus to linger during the morning period
before lifting to VFR with increasing strong, southerly winds in
the afternoon.

&&

.TOP WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

SHORT TERM...Teefey
LONG TERM...Manion
AVIATION...Prieto

Hazardous Weather Outlook
National Weather Service Topeka KS
932 PM CDT Thu Jun 20 2019

KSZ008>012-020>024-026-034>040-054>056-058-059-220245-
Republic-Washington-Marshall-Nemaha-Brown-Cloud-Clay-Riley-
Pottawatomie-Jackson-Jefferson-Ottawa-Dickinson-Geary-Morris-
Wabaunsee-Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson-
932 PM CDT Thu Jun 20 2019

This hazardous weather outlook is for east central...north
central and northeast Kansas.

.DAY ONE...Tonight.

A cluster of severe thunderstorms is expected to develop across
northwest Kansas and track eastward into the outlook area during
the overnight hours. The primary hazards with these storms will be
damaging winds and large hail.

Flooding will continue into late week on the Big Blue River and
its tributaries upstream of Tuttle Creek Lake. Flooding will also
continue along the Delaware River upstream of Perry Lake.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Additional thunderstorm activity is expected through the upcoming
weekend. Heavy rainfall and flash flooding may occur,
particularly Saturday night. Some of the storms could also be
severe with strong winds and large hail the primary threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

More detailed information can be accessed at...
http://www.weather.gov/top/sitrep

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE TOPEKA KS
947 PM CDT THU JUN 20 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0720 PM     HAIL             4 N VERMILLION          39.78N 96.27W
06/20/2019  E1.75 INCH       MARSHALL           KS   TRAINED SPOTTER

0716 PM     HAIL             4 N VERMILLION          39.78N 96.27W
06/20/2019  E1.00 INCH       MARSHALL           KS   STORM CHASER

0716 PM     HAIL             2.5 N VERMILLION        39.76N 96.27W
06/20/2019  E0.88 INCH       MARSHALL           KS   PUBLIC

&&

Special Weather Statement
National Weather Service Topeka KS
125 AM CDT Fri Jun 21 2019

KSZ008-020-210730-
Republic-Cloud-
125 AM CDT Fri Jun 21 2019

...SIGNIFICANT WEATHER ADVISORY FOR REPUBLIC AND NORTHWESTERN CLOUD
COUNTIES UNTIL 230 AM CDT...

At 124 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles south of Edgar to near Superior to 7
miles northeast of Portis. Movement was east at 50 mph.

Penny size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Belleville, Scandia, Jamestown, Courtland, Norway, Republic, Munden
and Narka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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.

&&

A Severe Thunderstorm Watch remains in effect until 400 AM CDT for
north central Kansas.

LAT...LON 4000 9737 3991 9737 3953 9793 4000 9793
TIME...MOT...LOC 0624Z 273DEG 42KT 4031 9797 3998 9807 3964 9858

Baerg

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