000
FXUS63 KLSX 170757
AFDLSX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
257 AM CDT TUE MAY 17 2011
.DISCUSSION...
/255 AM CDT TUE MAY 17 2011/
OMEGA BLOCK IN THE PROCESS OF SETTING UP SHOP OVER THE CONUS FOR A
GOOD PORTION OF THE UPCOMING WORK WEEK. DOUBLE BARREL UPPER LEVEL
LOW RESPONSIBLE FOR THE WET WEEKEND IS STILL SPINNING ALONG THE EAST
COAST. THESE TWO WILL CONSOLIDATE AND REMAIN ANCHORED OVER THE
CENTRAL APPALACHIANS THRU THURSDAY NIGHT. ANOTHER LOW WILL SLOWLY
SLIDE SOUTH ALONG THE WEST COAST AND DIG THRU THE DESERT SW THIS
WEEK. THIS PATTERN WILL KEEP THINGS FROM CHANGING VERY FAST ACROSS
THE CWA THRU FRIDAY. THE EAST COAST UPPER LOW FINALLY BEGINS TO MOVE
OFFSHORE LATE IN THE WEEK WHICH ALLOWS THE UPPER FLOW TO BEGIN
MOVING. THE NEXT UPPER LOW APPROACHES THE AREA AND BRINGS THE NEXT
ROUND OF PRECIP JUST IN TIME FOR THE WEEKEND.
TEMPS WILL SLOWLY MODERATE THRU THE WEEK THOUGH REMAIN BELOW NORMAL
UNTIL FRIDAY. TEMPS WILL REMAIN COOLER ACROSS ILLINOIS FOR THE NEXT
COUPLE DAYS BECAUSE OF ENHANCED CLOUD COVER...LOWER HEIGHTS AND 850
TEMPS DUE TO CLOSER PROXIMITY TO THE EAST COAST UPPER LOW. WARMING
TREND MAY BE TEMPERED A BIT LATE IN THE WEEK DUE TO INCREASING
CLOUD COVER IN ADVANCE OF THE NEXT UPPER LOW.
NO CHANGES WERE MADE BEYOND FRIDAY.
MILLER
&&
.AVIATION...
/1123 PM CDT MON MAY 16 2011/
VFR CONDITIONS EXPECTED THIS FORECAST PERIOD WITH A PERSISTENT
SFC RIDGE EXTENDING FROM MN WI S THROUGH MO. LGT N-NELY SFC WINDS
CAN BE EXPECTED LATE TGT. SCATTERED DIURNAL CUMULUS CLOUDS WILL
LIKELY DEVELOP IN UIN...STL AND SUS LATE TUE MRNG AND AFTN AS THE
MODELS SHOW MOISTURE AROUND 850 MB...ABOUT 5000 FT ADVECTING WWD
TO THE MISSISSIPPI RIVER BY TUE AFTN. N-NELY SFC WINDS WILL
INCREASE TO 8-10 KTS BY TUE AFTN AS WELL...THEN DIMINISH TUE EVNG.
SPECIFICS FOR KSTL...LGT NLY SFC WINDS FOR LATE TGT. SCT CUMULUS
CLOUDS ARE EXPECTED FOR TUE AFTN INTO TUE EVNG AROUND 5000 FT IN
HEIGHT...POSSIBLY GOING BKN DURING THE LATE AFTN. NLY SFC WINDS WILL
INCREASE TO AROUND 10 KTS BY TUE AFTN THEN DIMINISH TUE EVNG.
GKS
&&
.CLIMATE...
RECORD LOW TEMPERATURES THROUGH WEDNESDAY...
TUE 5/17 WED 5/18
SAINT LOUIS (KSTL) 40/1973 39/2002
COLUMBIA (KCOU) 35/1895 35/2002
QUINCY (KUIN) 38/1973 35/2002
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
IL...NONE.
&&
$$
WFO LSX
