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000
FXUS63 KTOP 212053
AFDTOP

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TOPEKA KS
353 PM CDT TUE MAY 21 2013

.SHORT TERM...(THIS EVENING THROUGH WEDNESDAY)
ISSUED AT 339 PM CDT TUE MAY 21 2013

UPPER LOW REMAINS ACROSS THE NORTHERN PLAINS WITH ENERGY ROTATING
AROUND THE BASE MOVING INTO NORTH CENTRAL NEBRASKA. A STRONG
SHORTWAVE WAS MOVING INTO WESTERN OKLAHOMA AT LATE AFTERNOON. MODELS
STILL SHOWING BEST FORCING (Q-VECTOR CONVERGENCE AND VORTICITY
ADVECTION) REMAINING TO THE SOUTH OF THE FORECAST AREA THIS EVENING.
SHORT RANGE HIGH RESOLUTION MODELS BREAK OUT SOME CONVECTION IN FAR
EAST CENTRAL KANSAS EARLY THIS EVENING AND WILL MAINTAIN SMALL
PRECIPITATION CHANCES FOR PARTS OF ANDERSON COUNTY THIS EVENING.
COLD ADVECTION ACROSS NORTHERN KANSAS WILL CONTINUE THROUGH THE
NIGHT WITH TEMPERATURES FALLING INTO THE UPPER 40S IN NORTH CENTRAL
KANSAS TO THE MID 50S IN EAST CENTRAL KANSAS.

CLOUDS WILL BE ON THE DECREASE WEDNESDAY MORNING AND EXPECT SOME
SCATTERED CUMULUS CLOUDS FOR MUCH OF THE AFTERNOON. COOL HIGH
PRESSURE WILL BUILD INTO NORTHEAST KANSAS WEDNESDAY AS THE UPPER
TROUGH MOVES INTO THE GREAT LAKES DURING THE DAY. TEMPERATURES WILL
BE COOLEST ACROSS THE FAR NORTH WITH HIGHS IN THE 60S WITH LOWER 70S
ACROSS THE SOUTH.


.LONG TERM...(WEDNESDAY NIGHT THROUGH TUESDAY)
ISSUED AT 339 PM CDT TUE MAY 21 2013

WED NIGHT THROUGH THU NIGHT...THE UPPER TROUGH IN THE UPPER MS VALLEY
WILL SWING EASTWARD INTO THE GREAT LAKES AS THE HIGH PLAINS UPPER
RIDGE SHIFTS EASTWARD INTO THE EASTERN PLAINS. THIS WILL ALLOW FOR
THE DRY NORTH TO NORTHEASTERLY FLOW THROUGH 850MB TO PERSIST AND
KEEP ANY SIGNIFICANT MOISTURE AND/OR INSTABILITY TO THE SOUTH OF THE
COUNTY WARNING AREA UNTIL LATER THURSDAY NIGHT. THIS WHEN WEAK
THETA E/MOISTURE ADVECTION BEGINS ACROSS THE FAR WEST AND
SOUTHWESTERN PORTIONS OF THE CWA...SO WILL INTRODUCE A SLIGHT CHANCE
FOR THUNDERSTORMS AT THAT TIME. SEASONABLY COOL LOW TEMPERATURES IN
THE UPPER 40S AND LOWER 50S WEDNESDAY NIGHT WILL EDGE UP INTO THE LOW
TO MIDDLE 50S THURSDAY NIGHT WHILE HIGHS ON THURSDAY TOP OUT IN THE
LOW TO MIDDLE 70S.

FRI THROUGH TUESDAY...THE RIDGING ALOFT WILL SLOWLY TRANSLATE
EASTWARD INTO THE MO AND MS VALLEY AREAS OVER THE WEEKEND INTO EARLY
NEXT WEEK. THIS WILL TRANSITION THE FLOW ALOFT TO A MORE WEST AND
SOUTHWESTERLY DIRECTION. THIS WILL ALLOW FOR A LEESIDE SFC
TROUGH/LOW IN THE CENTRAL HIGH PLAINS TO REMAIN ANCHORED THROUGH THE
PERIOD. AT THE SAME TIME...THE UPPER FLOW WILL LIKELY DIRECT A
SERIES OF WEAK SHORTWAVE TROUGHS OUT OF THE MAIN UPPER TROUGH IN THE
WESTERN CONUS OUT INTO THE CENTRAL PLAINS. MOISTURE RETURN WILL
CONTINUE/REMAIN IN PLACE THROUGH THE PERIOD...SO THE PASSAGE ANY OF
THE SHORTWAVE WILL HAVE THE POTENTIAL TO TRIGGER CONVECTION ACROSS
THE AREA THROUGH THE PERIOD. THIS FAR OUT IT REMAINS VERY DIFFICULT
TO PIN DOWN THE TIMING AND/OR AREAL EXTENT OF ANY CONVECTION AND
MESOSCALE FEATURES SUCH AS OUTFLOW BOUNDARIES FROM POSSIBLE MCS`S
EACH DAY WOULD ONLY COMPLICATE THE FCST. HAVE THEREFORE CONTINUED A
BROAD AND GENERAL FCST ON THE PRECIP POTENTIAL WITH HIGHS GENERALLY
IN THE 80S.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON)
ISSUED AT 1259 PM CDT TUE MAY 21 2013

VFR STRATUS WILL MOVE ACROSS THE TERMINALS THROUGH 10Z WITH A
DECREASE IN CLOUDS AFTER 12Z WEDNESDAY. WINDS WILL REMAIN NEAR 10
KTS WITH SOME HIGHER GUSTS THROUGH 00Z THEN DECREASE TO LESS THAN
10 KTS. WINDS BECOME WEST NORTHWEST AROUND 10 KTS BY 15Z WEDNESDAY.

&&

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

$$

SHORT TERM...53
LONG TERM...63
AVIATION...53