Severe Thunderstorm Warning 9, NWS Kansas City, MO

AREA FORECAST DISCUSSION
National Weather Service Kansas City/Pleasant Hill MO
646 PM CDT Wed Apr 17 2019

.Discussion...
Issued at 322 PM CDT WED APR 17 2019

First severe weather threat of the season expected to get underway
late this afternoon and and evening as well-advertised cold front
moves south over the region. Afternoon 1-min visible satellite
imagery finally starting to show some breaks in the overlying
status deck, which should help the atmosphere become weak to
moderately unstable as MLCAPE values exceed 1500-2000 J/kg later
today. Biggest uncertainty with this evening's event continues to
be the strength of the capping inversion, and whether enough
frontal convergence and column lifting associated with large-scale
ascent from an approaching shortwave to our northwest will be
able to provide enough forcing to initiate surface based
convection. In fact, latest ACARS soundings from MCI still show a
fairly strong cap in place over our region, which may be showing
some signs of weakening as latest 7.34 um water vapor imagery is
showing the warmest brightness temperatures associated with the
cap beginning to move east into eastern Missouri and western
Illinois. Given this scenario, along with the fact that various
high-res model solution's suggest the cold front will eventually
light up early this evening, we expect expect activity to get
underway around the 00z time frame.

An additional area of uncertainty continues to be just how much of
this activity impacts the greater Kansas City Metro. Latest high-
res model runs seem to want to develop convection a little further
north than previously expected, which means a sizable portion of
the KC metro may be under the gun for developing storms later this
evening. That said, best chances still look to occur along and
south of the I-35 corridor, with activity decreasing in areal
extent the further north one goes. In any event, given sufficient
buoyancy for ascent, along with unidirectional shear profiles
through the atmospheric column, it currently appears the main
threats will be large hail and strong winds owing to steep low
and mid-level lapse rates along with decent downdraft CAPE values
(500-1000 J/kg) which should allow adequate mixing of
thunderstorm generated downdrafts to the surface. Storm mode will
likely be messy as deep-layered shear vectors will become
increasingly parallel to the incoming boundary as the evening
hours progress. While enough shear may exist for a few isolated
storms initially, the prevailing idea is that activity will
congeal into a MCS fairly quickly this evening. While an isolated
tornado or two cannot be ruled out with initial discrete activity,
the main threats will undoubtedly be large hail and strong winds,
especially as activity becomes more and more linear in nature.

In addition to the severe wx threat, the other concern will be the
potential for heavy rainfall as models continue to paint 1+"
amounts across southern portions of the fcst area, especially
south of Route 50. Fortunately, 1- and 3-hr flash flood guidance
values largely remain over 2" for a good portion of the area,
which combined with the expectation that the heaviest rains will
occur over a non-urban landscape, should promote a limited flash
flood threat despite PWAT values exceeding the 90th percentile
for this time of year.

Rain/storms should gradually start working to the south and east
during the predawn hours which should be followed by a drying
trend on Thursday. Temperatures will be noticeably cooler both
Thursday and Friday as cold air advection remains in place both
days. From this point forward, the fcst largely looks dry through
the first half of the weekend before a southward sagging cold
front brings the next chance for organized rainfall to the area on
Easter Sunday. And looking even further out, unsettled weather
looks to remain across the region through midweek as longwave
troughing takes hold over the southern Rockies and Plains, which
should allow several migrating disturbances to pass overhead in
persistent southwesterly flow aloft.

&&

.Aviation...(For the 00Z TAFS through 00Z Thursday Evening)
Issued at 646 PM CDT WED APR 17 2019

Cold front moving slowly southeastward across all TAF sites will
arrive between 00z-02z, bringing through a broken line of storms
and a sharp wind shift to the northwest. Ceilings should be mostly
VFR but may drop briefly below 3 kft in individual storms.
Otherwise, no significant aviation hazards are expected.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
MO...NONE.
&&

Discussion...32
Aviation...Laflin

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
449 AM CDT Wed Apr 17 2019

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-181000-
Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte-Johnson KS-
Atchison MO-Nodaway-Worth-Gentry-Harrison-Mercer-Putnam-Schuyler-
Holt-Andrew-De Kalb-Daviess-Grundy-Sullivan-Adair-Buchanan-Clinton-
Caldwell-Livingston-Linn MO-Macon-Platte-Clay-Ray-Carroll-Chariton-
Randolph-Jackson-Lafayette-Saline-Howard-Cass-Johnson MO-Pettis-
Cooper-Bates-Henry-
449 AM CDT Wed Apr 17 2019

This hazardous weather outlook is for northwest...north central and
west central Missouri...as well as extreme eastern Kansas.

.DAY ONE...Today and Tonight

Storm chances return this evening. Some storms could be strong to
severe between 6 PM and 10 PM, with large hail and damaging winds
the primary threats.

 More detailed information can be accessed at...
 https://www.weather.gov/eax/hwo

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

No hazardous weather is expected at this time.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
721 PM CDT WED APR 17 2019

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

0656 PM     HAIL             4 NNW FAUCETT           39.65N 94.83W
04/17/2019  E1.25 INCH       BUCHANAN           MO   PUBLIC

&&

JP

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
733 PM CDT WED APR 17 2019

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

0705 PM     HAIL             3 NNW AGENCY            39.68N 94.76W
04/17/2019  E1.25 INCH       BUCHANAN           MO   PUBLIC

&&

EH

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
811 PM CDT Wed Apr 17 2019

MOZ022-029>031-037-180200-
Ray MO-Carroll MO-Jackson MO-Caldwell MO-Clay MO-
811 PM CDT Wed Apr 17 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CLAY...RAY...
NORTHWESTERN CARROLL...SOUTHEASTERN CALDWELL AND NORTHEASTERN JACKSON
COUNTIES UNTIL 900 PM CDT...

At 811 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Lawson to Woods Heights to near Missouri
City to near Liberty. Movement was east at 30 mph.

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

Locations impacted include...
Liberty, Excelsior Springs, Richmond, Pleasant Valley, Orrick,
Glenaire, Crystal Lakes, Sibley, Missouri City, Excelsior Estates,
River Bend, Woods Heights, Rayville, Mosby, Homestead, Prathersville
and Knoxville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
north central and west central Missouri.

LAT...LON 3961 9369 3950 9371 3934 9389 3915 9421
      3921 9448 3928 9438 3937 9424 3949 9411
TIME...MOT...LOC 0111Z 250DEG 25KT 3942 9411 3935 9416 3928 9427 3924
9435

Kurtz

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
848 PM CDT Wed Apr 17 2019

KSZ057-105-180230-
Johnson KS-Miami KS-
848 PM CDT Wed Apr 17 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MIAMI AND CENTRAL
JOHNSON COUNTIES UNTIL 930 PM CDT...

At 848 PM CDT, Doppler radar was tracking a strong thunderstorm over
Edgerton, moving northeast at 20 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Overland Park, Olathe, Shawnee, Lenexa, Gardner, De Soto, Edgerton,
Clare and Lackmans.

This includes the following highways...
 Interstate 35 in Kansas between mile markers 200 and 205, and
between mile markers 207 and 224.
 Interstate 435 between mile markers 0 and 7, and between mile
markers 81 and 83.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
east central Kansas.

LAT...LON 3886 9505 3904 9483 3901 9473 3892 9470
      3870 9506
TIME...MOT...LOC 0148Z 232DEG 19KT 3879 9503

Kurtz

Special Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
852 PM CDT Wed Apr 17 2019

MOZ016-017-022>025-030>032-037>039-180245-
Ray MO-Carroll MO-Macon MO-Adair MO-Saline MO-Chariton MO-
Lafayette MO-Livingston MO-Jackson MO-Linn MO-Caldwell MO-
Sullivan MO-
852 PM CDT Wed Apr 17 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHARITON...
SOUTHWESTERN ADAIR...LINN...SOUTHEASTERN SULLIVAN...CENTRAL RAY...
CARROLL...SOUTHEASTERN CALDWELL...NORTHWESTERN SALINE...NORTHWESTERN
MACON...NORTHEASTERN LAFAYETTE...NORTHEASTERN JACKSON AND
SOUTHEASTERN LIVINGSTON COUNTIES UNTIL 945 PM CDT...

At 852 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Richmond to 10 miles northwest of Hardin
to 7 miles southeast of Cowgill to 6 miles east of Braymer to 8 miles
northwest of Hale to near Wheeling. Movement was northeast at 55 mph.

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

Locations impacted include...
Richmond, Brookfield, Carrollton, Marceline, Braymer, Brunswick,
Orrick, Norborne, Hardin, Bucklin, Meadville, Hale, Henrietta,
Laclede, Bosworth, Linneus, Wheeling, Wakenda, Rayville and New
Cambria.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
central, north central, northeastern and west central Missouri.

LAT...LON 3927 9333 3961 9286 3978 9271 3993 9262
      4004 9259 4018 9271 3992 9337 3980 9347
      3968 9367 3958 9386 3947 9399 3921 9420
TIME...MOT...LOC 0152Z 241DEG 46KT 3930 9404 3940 9393 3948 9384 3958
9367 3967 9347 3973 9337

Kurtz

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
856 PM CDT WED APR 17 2019

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

0835 PM     HAIL             1 SW RAYVILLE           39.37N 94.06W
04/17/2019  E1.00 INCH       RAY                MO   TRAINED SPOTTER

&&