Severe Thunderstorm Warning 190, NWS Kansas City, MO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
622 PM CDT WED JUN 17 2009

...UPDATED AVIATION DISCUSSION...

.DISCUSSION...

NEAR TERM FORECAST...

NEXT 24 HOURS...PRIMARY CONCERNS ARE ON THE CONVECTIVE WEATHER. WARM
FRONT LIFTING NORTH THROUGH THE FORECAST REGION TODAY MADE IT JUST
NORTH OF A LINE FROM THE KANSAS CITY INTERNATIONAL AIRPORT TO
FAYETTE BY THE EARLY AFTERNOON HOURS. MUCAPE VALUES OF 5000+ J/KG
WITH MID 70 DEGREE DEW POINTS AND 0-6KM SHEAR VALUES OF 40+ KNOTS
ALL SPEAK TO THE POTENTIAL FOR EXPLOSIVELY SEVERE WEATHER THROUGH
THE REST OF THE AFTERNOON AND EVENING HOURS ALONG THE FRONT.

CURRENTLY TWO SUPER CELLS STORMS ARE TRACKING EAST ALONG/JUST NORTH
OF THE FRONT. CURRENT EXPECTATIONS ARE THAT THESE STORMS WILL HELP
LIFT THE FRONT NORTH A LITTLE MORE. SHEAR PARAMETERS AND ABUNDANT
CAPE IN NORTHERN KANSAS AND NORTHWEST MISSOURI SPEAKS TO THE
SUPERCELLS THAT WE ARE ALREADY SEEING. HOWEVER...AS THE STORMS MOVE
FARTHER EAST THEY WILL MOVE AWAY FROM THE GOOD SHEAR INTO A REGION
OF MODERATE AND THEN WEAK SHEAR. THIS WOULD INDICATE THAT AS THE
STRONGLY ROTATING STORMS MOVE EAST THEY WILL TRANSITION TO A
SPLITTING AND BOWING STORM TYPES. THEREFORE...THE THREAT OF ISOLATED
TORNADOES LOOKS TO ONLY EXTENDED AS FAR EAST AS AN ATCHISON
KANSAS...ST JOSEPH...MARYVILLE LINE AT THIS TIME. AS STORMS MOVE
FARTHER EAST THE PRIMARY THREATS WILL BE LARGE HAIL AND DAMAGING
STRAIGHT LINE WINDS...MAINLY NORTH OF THE MISSOURI RIVER AND SOUTH
OF HIGHWAY 36.

DESECRATE THUNDERSTORM ACTIVITY WILL PERCOLATE ALONG THROUGH THE MID
TO LATE EVENING HOURS...AFTER THAT THE LOW LEVEL JET IS EXPECTED TO
KICK IN ACROSS EASTERN KANSAS...POINTING TOWARDS SOUTHEAST NEBRASKA.
WITH ABUNDANT MOISTURE RIDING UP AND OVER THE FRONT...AND THE
ORGANIZING INFLUENCE OF THE LOW LEVEL JET...EXPECT ANY PERSISTENT
ACTIVITY TO CONGEAL INTO A COMPLEX OF STORMS LATE THIS EVENING.
CORFIDI VECTORS AND 1000-500MB THICKNESS LINE INDICATE THAT ANY
COMPLEX THAT DEVELOPS WILL SLIDE EAST-SOUTHEAST ALONG THE FRONT.
THIS SHOULD BRING RAIN TO AREAS NORTH OF THE MISSOURI RIVER EARLY
THURSDAY MORNING. HEAVY RAIN WILL BE A CONCERN WITH THE ACTIVITY
TONIGHT...WHILE MARGINALLY SEVERE WEATHER MIGHT BE POSSIBLE ALONG HE
SOUTHERN EDGE WHERE MORE UNSTABLE AIR WILL BE INGESTED.

CUTTER

THURSDAY THROUGH FRIDAY...

MAIN CONCERNS FOR THURSDAY THROUGH THE EXTENDED TIME FRAME DEALS
WITH HOT AND HUMID CONDITIONS AS WELL AS A CHANCE OF THUNDERSTORMS
THURSDAY NIGHT THROUGH FRIDAY.

THURSDAY THROUGH FRIDAY:
UPPER RIDGE AXIS WILL BE POSITIONED GENERALLY ALONG THE MISSISSIPPI
RIVER VALLEY WITH VERY WARM TEMPERATURES ALOFT. DECENT MIXING IS
EXPECTED THOUGH NOT TO THE HEIGHT OF THE WARMEST TEMPERATURES ALOFT.
ALSO ANTICIPATE SOME OF THE POTENTIAL WARM UP GOING TO EVAPORATION
OF VERY MOIST SOILS. EVEN WITH THOSE LIMITING FACTORS TEMPERATURES
SHOULD STILL CLIMB INTO THE LOWER 90S. THOSE TEMPERATURES COMBINED
WITH DEWPOINTS AROUND 70 DEGREES SHOULD YIELD VERY UNCOMFORTABLE
HEAD INDEX READINGS APPROACHING 100 DEGREES ACROSS OUR SOUTHERN
ZONES AND INTO EAST CENTRAL KANSAS.

AN UPPER WAVE WILL MOVE INTO THE AREA LATE THURSDAY NIGHT/ EARLY
FRIDAY MORNING AND SLOWLY PROGRESS THROUGH THE AREA DURING THE DAY
FRIDAY. AS THE LOW LEVEL JET CRANKS UP AHEAD OF THE WAVE THURSDAY
NIGHT WE WILL SEE THUNDERSTORM CHANCES FOR MUCH THE AREA WITH THE
BEST CHANCES ALONG THE MISSOURI AND IOWA STATE LINE. AS THE WAVE
MOVES FURTHER EAST DURING THE DAY FRIDAY A GENERAL INCREASE IN
SHOWER/THUNDERSTORM ACTIVITY IS EXPECTED ACROSS THE ENTIRE REGION.
THIS ACTIVITY SHOULD EXIT MOST OF THE FORECAST AREA BY LATE FRIDAY
NIGHT WITH THE EXCEPTION OF OUR EASTERN ZONES.

SATURDAY AND SUNDAY:
UPPER RIDGE BUILDS AGAIN SATURDAY BUT WARMEST TEMPERATURES ALOFT
WILL ARRIVE SUNDAY. AS A RESULT... TEMPERATURES SHOULD BE HELD TO
THE MID/UPPER 80S SATURDAY AND CLIMB INTO THE LOWER 90S SUNDAY.
ADDED SLIGHT CHANCE POPS TO THE WESTERN THIRD OF THE FORECAST AREA
SATURDAY NIGHT AS THE LOW LEVEL JET MOVES INTO THE AREA.

MONDAY THROUGH WEDNESDAY:
HOT AND HUMID CONDITIONS ARE EXPECTED TO CONTINUE AS THE UPPER RIDGE
MAINTAINS ITSELF ACROSS THE UPPER MIDWEST THROUGH THE SOUTHERN
PLAINS. HIGHER DEWPOINTS IN THE LOWER 70S ARE EXPECTED TO REMAIN
ACROSS THE AREA AND WHEN COMBINED WITH THE HOT TEMPERATURES HEAT
INDEX VALUES IN THE UPPER 90S AND LOW 100S ARE LIKELY. THERE ARE
SOME INDICATIONS THAT A BOUNDARY WILL DRAPE ITSELF ACROSS THE AREA
ON TUESDAY AND WEDNESDAY. WITH VARYING MODEL SOLUTIONS AND BEING
VERY MUCH INTO THE EXTENDED OPTED TO NOT TRY TO PORTRAY THIS FEATURE
IN THE FORECAST. SO FOR NOW HAVE KEPT THE EXTENDED DRY BUT VERY WARM
AND HUMID. BUT SHOULD A BOUNDARY POSITION ITSELF ACROSS THE AREA
THUNDERSTORM CHANCES WOULD BE NEEDED.

CDB

&&

.AVIATION...

FOR THE 00Z TAFS...THE THREAT OF CONVECTION THIS EVENING IS RAPIDLY
DIMINISHING AS A STRONG CAP AT 700MB MOVES EAST TOWARD EXTREME WRN
MO. THE WEAK OUTFLOW BOUNDARY OVER THE TERMINALS WILL WASH OUT THIS
EVENING WITH WINDS TURNING SSE. IN ADDITION...WITH THE INCREASE IN
THE LLJ...LLVL WIND SHEAR IS POSSIBLE AROUND DAYBREAK. SFC WINDS WILL
INCREASE THURSDAY MORNING...OTHERWISE VFR CONDITIONS ARE EXPECTED
THROUGH FRIDAY.

DB

&&

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
106 PM CDT WED JUN 17 2009

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-181800-
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-
106 PM CDT WED JUN 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL
AND WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A WARM FRONT LIFTING NORTH THROUGH THE REGION TODAY WILL PROVIDE SOME
FOCUS FOR SEVERE WEATHER THIS AFTERNOON AND THIS EVENING. STORMS
WILL DEVELOP ACROSS NORTH CENTRAL KANSAS AND SOUTHERN NEBRASKA THIS
AFTERNOON...AND MOVE EAST INTO FAR NORTHWEST MISSOURI AND ADJACENT
AREAS OF KANSAS. PRIMARY AREAS OF CONCERN WILL BE ALONG AND NORTH OF
A LINE FROM ATCHISON KANSAS THROUGH CHILLICOTHE DURING THE AFTERNOON
AND EVENING HOURS...WITH LARGE HAIL...DAMAGING WINDS...AND ISOLATED
TORNADOES BEING THE PRIMARY THREATS.

LATER TONIGHT...A COMPLEX OF STORMS WILL DEVELOP FROM THE AFTERNOON
AND EVENING ACTIVITY IN NEBRASKA AND WOULD TEND TO MOVE TO THE EAST
SOUTHEAST ALONG THE WARM FRONT. THIS COULD BRING IT INTO EXTREME NORTHERN
MISSOURI LATE TONIGHT...WITH THE POTENTIAL OF STRONG STORMS WITH
DAMAGING WINDS...LARGE HAIL AND HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THURSDAY NIGHT AND INTO FRIDAY...A COLD FRONT WILL BE MOVING
SOUTHEAST ACROSS EASTERN KANSAS AND MISSOURI. THERE WILL BE A CHANCE
OF THUNDERSTORMS WITH THIS FRONT...STARTING OVERNIGHT THURSDAY
NIGHT...AND DURING THE DAY ON FRIDAY. SEVERE WEATHER MAY OCCUR WITH
THIS FRONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EARLY THIS
EVENING IN AREAS NORTH OF A LINE FROM ATCHISON KANSAS TO CHILLICOTHE
MISSOURI THIS AFTERNOON AND THIS EVENING. THEN OVERNIGHT...SPOTTER
ACTIVATION MAY BE NEEDED IN AREAS NEAR THE IOWA BORDER...AND AS FAR
SOUTH AS MOBERLY DURING EARLY MORNING HOURS OF THURSDAY.

CUTTER

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
705 PM CDT WED JUN 17 2009

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

0655 PM     TSTM WND GST     2 W GRAND PASS          39.21N 93.48W
06/17/2009  E70 MPH          SALINE             MO   TRAINED SPOTTER

            QUARTER SIZED HAIL ALSO REPORTED.

&&

MELL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
710 PM CDT WED JUN 17 2009

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

0705 PM     TSTM WND DMG     3 W NORBORNE            39.30N 93.73W
06/17/2009                   CARROLL            MO   TRAINED SPOTTER

            PIECE OF A BARN RIPPED OFF. POWER LINES DOWN.

&&

MELL