STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK
DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS.
VALID 120100Z - 121200Z
THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM
30 NNE SSI SAV FAY 15 WNW GSB 10 ENE ORF.
THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM CPR
45 NNE DGW BFF SNY GLD 30 NW HUT SZL BLV EVV BWG ARG HRO END
55 WNW CSM PVW ROW 4CR LVS TAD FCL LAR CPR.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 E CRP 10 SW LRD
...CONT... 25 S P07 55 SW SJT ACT GGG MLU CBM RMG HKY RIC
20 ENE WAL.
GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 70 SW GBN EED
65 S SGU GCN INW GNT ALS CAG RIW WRL GCC AIA LBF 55 SSW HSI CNK
FLV IRK MLI ALO FRM 25 WSW FAR 60 NNE DVL ...CONT... 25 ENE ELO
65 N EAU SBN ZZV PKB LOZ BNA JBR MKO 45 ENE OKC CSM 45 NE BGS FST
60 WNW MRF.
...CENTRAL PLAINS INTO MISSOURI OZARKS...
LOW-LEVEL BAROCLINIC ZONE EXTENDING FROM THE CENTRAL HIGH PLAINS
INTO THE LOWER OHIO VALLEY WILL BECOME FOCUS FOR PRIMARY CONVECTIVE
DEVELOPMENT TONIGHT. STRONG/SEVERE STORMS HAVE ALREADY BEEN
OCCURRING PAST COUPLE OF HOURS NEAR FRONTAL ZONE ACROSS SOUTH
CENTRAL MISSOURI...IN ZONE OF STRONGER LOW-LEVEL WARM ADVECTION.
THIS ACTIVITY HAS BEEN ENHANCED BY DIFLUENT/WEAKLY DIVERGENT UPPER
FLOW REGIME...EAST OF FOUR CORNER'S RIDGE...AND SOUTH/WEST OF GREAT
LAKES LOW. ON TAIL END OF SHORT WAVE ROTATING AROUND LOW...STORMS
WILL GRADUALLY SHIFT EAST SOUTHEASTWARD NEAR FRONTAL ZONE INTO THE
LOWER OHIO VALLEY LATER TONIGHT.
MORE INTENSE STORMS WILL CONTINUE TO DEVELOP UPSTREAM...ACROSS
SOUTHERN KANSAS...WHERE STRENGTHENING WEST SOUTHWESTERLY LOW-LEVEL
JET ALONG PRE-FRONTAL THERMAL RIDGE AXIS WILL CONTRIBUTE TO
INCREASING LARGE-SCALE ASCENT. THIS MAY BECOME ENHANCED BY UPPER
JET STREAK ROUNDING CREST OF SUBTROPICAL RIDGE AXIS INTO THE NORTH
CENTRAL HIGH PLAINS...WHICH IS SUPPORTING ONGOING STRONG/SEVERE
CONVECTIVE DEVELOPMENT IN MOIST UPSLOPE REGIME IN THE LEE OF THE
FRONT RANGE.
HIGH PLAINS ACTIVITY SHOULD DIMINISH LATER THIS EVENING AS AIR MASS
STABILIZES WITH LOSS OF DAYTIME HEATING...BUT ONE OR MORE CLUSTERS
OF STORMS WILL BE POSSIBLE IN POTENTIALLY MORE UNSTABLE ENVIRONMENT
...FROM NEAR THE KANSAS/OKLAHOMA BORDER INTO THE MISSOURI OZARKS.
MEAN MIXED LAYER CAPE OF 1000 TO 2000 J/KG WILL SUPPORT VIGOROUS
UPDRAFTS...WITH POTENTIAL FOR LARGE HAIL...PARTICULARLY NEAR
INTERSECTION OF THERMAL/MOISTURE AXES ACROSS SOUTHEAST KANSAS.
HOWEVER...PRIMARY THREAT OVERNIGHT APPEARS TO BE STRONG GUSTY WINDS
...WITH LOW RELATIVE HUMIDITY LEVELS IN LOWER/MID-LEVELS ENHANCING
EVAPORATIVE COOLING IN DOWNDRAFTS...AND DOWNWARD TRANSFER OF HIGHER
MOMENTUM AIR ASSOCIATED WITH LOW-LEVEL JET.
...LOWER OHIO VALLEY...
GRADUAL SOUTHEASTWARD ADVECTION OF COOLER MID-LEVEL AIR MASS INTO
THE LOWER OHIO VALLEY WILL CONTINUE TONIGHT...ALONG/NORTH OF STRONG
NORTHWESTERLY UPPER JET AXIS ON SOUTHWESTERN QUADRANT OF GREAT
LAKES CLOSED LOW. HOWEVER...WITH LOSS OF DAYTIME HEATING...
ENVIRONMENT IS EXPECTED TO BECOME LESS CONDUCIVE FOR LARGE HAIL...
AND STORMS SPREADING INTO SOUTHERN INDIANA/CENTRAL ILLINOIS SHOULD
SLOWLY DECREASE IN INTENSITY.
...SOUTHERN MID ATLANTIC COAST...
LINE OF STORMS HAS SLOWLY INCREASED EARLY THIS EVENING AHEAD OF
SHORT WAVE TROUGH SHIFTING EAST OF THE SOUTHERN APPALACHIANS. BELT
OF 30+ KT MEAN WEST SOUTHWESTERLY FLOW PERSISTS ACROSS THE EASTERN
CAROLINAS...AND WILL CONTINUE TO PROVIDE POTENTIAL FOR SPORADIC
WIND DAMAGE AS LINE PROGRESSES THROUGH MOIST UNSTABLE AIR
MASS...OFF COASTAL AREAS BY 12/06Z.
..KERR.. 07/11/03
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED FOR 0600Z
|