Special Weather Statement, NWS Topeka, KS

AREA FORECAST DISCUSSION
National Weather Service Topeka KS
1137 PM CDT MON JUL 11 2016

...Update to aviation forecast discussion...

.SHORT TERM...(This Evening through Tuesday)
Issued at 219 PM CDT MON JUL 11 2016

Upper trough axis this afternoon was centered over Wyoming into
eastern Montana, while a weaker vorticity lobe was lifting northeast
over western Nebraska. The cold front at 3 PM is centered from
southwest KS through central NE with a warm and moist airmass in
place over northeast KS. Dewpoints are generally in the lower 70s
and temps in the lower 90s. Heat indicies as a result are in the 101
to 105 range...although the heat is alleviated somewhat by the
strong southerly winds at 15 to 25 mph sustained through early
evening.

Strong instability in the 2500 to 3500 J/KG range is expected after
4 PM over north central Kansas. The warm elevated mixed layer will
gradually weaken but remain present after 5 PM per forecast
soundings near CNK. In addition, all high resolution guidance is not
particularly strong with the convergence along the front until 00Z
and thereafter when the boundary approaches. Have adjusted pops
accordingly to focus north of Interstate 70 through midnight where
the better forcing from the passing upper trough resides. Any
isolated cell through early evening will be able to rotate given the
environment with high and damaging winds as the main hazards. As
convection transitions into a broken line overnight, damaging wind
gusts would be the main concern as a decent southwesterly LLJ
supports activity through 12Z Tuesday.

The front becomes stationary from west to east across northeast KS
providing a focus for additional development Tuesday afternoon.
Temporary subsidence behind the overnight convection should provide
a dry period in the early afternoon, allowing the atmosphere to
recover. MUCAPE values increase to near 3000 J/KG by late afternoon
while 0-6 KM Bulk shear is marginal around 30 kts. There could be a
few strong to severe storms over east central KS by late afternoon,
while better chances carry into Tuesday evening. With the weaker
warm advection north of the front in north central KS, have lowered
highs a few degrees into the upper 80s with lower 90s seen
elsewhere.

.LONG TERM...(Tuesday Night through Monday)
Issued at 219 PM CDT MON JUL 11 2016

Trailing frontal boundary into NE Kansas in concert with the LLJ
Tuesday night is forecast to produce precip across NE KS. Have
focused PoPs in the eastern counties as jet turns through the
night. Enough CAPE and somewhat disorganized wind shear for SPC
to keep area in a slight risk. Frontal boundary could be shifted
by more mesoscale processes under an otherwise zonal flow pattern
aloft, while stronger front moves into far northern Kansas by
late day Wednesday and provides a focus for storms. With a more
discernible feature to focus activity on, will carry slightly
higher chance PoPs for the Wednesday night forecast. Boundary
stalls in our area by Thursday morning, with additional
redevelopment of increasing chances into southern Kansas, and
will carry lower chances Thursday with a slight increase
southward.

Forecast uncertainty increases the farther out in the forecast,
although has been somewhat consistent signal to redevelop
convection Thursday night over the boundary, with question as to
how far south the heavier rain will fall. Friday into Saturday are
transitional days as the front slowly makes its way back
northward, with the 12z GFS not lifting ridging aloft back over
the area until after sunrise on Monday while the EC is faster with
its return. As a result have some kind of rain chances across most
of the area until 0z Monday where chances start to clear west to
east. High temperatures on Wednesday may still reach middle 90s
before the front comes through, while area then cools down a bit
back into the 80s for Thursday into the weekend. Lows also take a
short term drop back into the 60s on night with convection before
starting to rise again late in the forecast.

&&

.AVIATION...(For the 06Z TAFS through 06Z Tuesday Night)
Issued at 1136 PM CDT MON JUL 11 2016

TSRA expected to increase in coverage through 11Z and have
inserted tsra in tempo groups from 07Z through 11Z. Models suggest
convection will decrease through 15Z with a lull until around 21Z
with redevelopment across the area. Have added vcts after 22Z.
Winds south around 10 kts through the period.

&&

.TOP Watches/Warnings/Advisories...
NONE.
&&

SHORT TERM...Prieto
LONG TERM...67
AVIATION...53

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TOPEKA KS
957 PM CDT MON JUL 11 2016

KSZ008>012-020>024-026-034>040-054>056-058-059-130300-
REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY-
POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS-
WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON-
957 PM CDT MON JUL 11 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH
CENTRAL AND NORTHEAST KANSAS.

.DAY ONE...TONIGHT.

THERE IS A CHANCE FOR SCATTERED STORMS ACROSS THE OUTLOOK AREA OVERNIGHT.
A FEW STRONG STORMS WILL BE POSSIBLE...PRIMARILY ALONG AND NORTH
OF INTERSTATE 70...WITH THE MAIN HAZARDS BEING STRONG WIND GUSTS
AND HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

THUNDERSTORM CHANCES CONTINUE INTO THE DAY ON TUESDAY...WITH
REDEVELOPMENT OF STRONG TO SEVERE STORMS POSSIBLE BY TUESDAY
AFTERNOON AND INTO THE OVERNIGHT HOURS. THUNDERSTORMS CONTINUE
WEDNESDAY INTO WEDNESDAY NIGHT AND AS A FRONT MOVES ACROSS THE
AREA. LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE WITH THESE STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

&&

MORE DETAILED INFORMATION CAN BE ACCESSED AT...
HTTP://WWW.WEATHER.GOV/TOP/SITREP

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
1122 PM CDT MON JUL 11 2016

KSZ008-020-120445-
CLOUD-REPUBLIC-
1122 PM CDT MON JUL 11 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL REPUBLIC AND
NORTHWESTERN CLOUD COUNTIES UNTIL 1145 PM CDT...

AT 1121 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR JAMESTOWN...MOVING EAST AT 20 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CONCORDIA...JAMESTOWN AND AURORA.

LAT...LON 3964 9793 3970 9755 3944 9753 3942 9793
TIME...MOT...LOC 0421Z 263DEG 19KT 3955 9782

HENNECKE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
1157 PM CDT MON JUL 11 2016

KSZ020-120530-
CLOUD-
1157 PM CDT MON JUL 11 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CLOUD COUNTY UNTIL
1230 AM CDT...

AT 1156 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR CONCORDIA...MOVING EAST AT 25 MPH.

NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
CONCORDIA...CLYDE AND AURORA.

LAT...LON 3960 9769 3966 9739 3965 9737 3941 9737
      3940 9765
TIME...MOT...LOC 0456Z 264DEG 20KT 3951 9762

HENNECKE

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
132 AM CDT TUE JUL 12 2016

KSZ020-120700-
CLOUD-
132 AM CDT TUE JUL 12 2016

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CLOUD COUNTY UNTIL 200 AM
CDT...

AT 130 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR JAMESTOWN...MOVING EAST AT 20 MPH. A SECOND STRONG THUNDERSTORM
WAS LOCATED 4 MILES WEST OF SIMPSON...MOVING EAST AT 20 MPH.

DIME TO PENNY SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
CONCORDIA...GLASCO...JAMESTOWN AND AURORA.

LAT...LON 3963 9793 3963 9752 3935 9751 3935 9793
TIME...MOT...LOC 0630Z 266DEG 19KT 3953 9785

GARGAN