198 FXUS64 KMAF 212318 AFDMAF AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX 618 PM CDT TUE MAY 21 2013 .DISCUSSION... SEE AVIATION DISCUSSION BELOW. && .AVIATION... COLD FRONT VERY NEAR FST BUT THE PUSH IS WEAKENING. AS SUCH WINDS WILL SLOWLY TURN E-SE OVERNIGHT AND MOSTLY REMAIN 10KTS OR LESS. NAM12 DOES SUGGEST SOME BRIEF MVFR CIGS WED AM FST/MAF BUT FOR NOW WILL NOT INCLUDE OUTLIER SOLUTIONS. S WINDS WED AT 10-15 KTS. && .PREV DISCUSSION... /ISSUED 400 PM CDT TUE MAY 21 2013/ DISCUSSION... COOLER TEMPERATURES THIS AFTERNOON WILL GIVE WAY TO WARMER CONDITIONS WEDNESDAY AS UPPER HEIGHTS BUILD OVERHEAD. RETURN FLOW ON THE BACKSIDE OF THE SURFACE HIGH WILL BRING LOW LEVEL MOISTURE BACK ACROSS THE AREA WEDNESDAY NIGHT...WITH SUBSTANTIAL MOISTURE RETURN ALL THE WAY BACK TO THE MOUNTAINS POSSIBLE. THIS MOISTURE WILL MIX OUT WITH STRONG HEATING THURSDAY...BUT THERE SHOULD BE ENOUGH INSTABILITY AND LIFT WITH INCREASING FLOW ALOFT TO SUPPORT ISOLATED DIURNAL THUNDERSTORMS. A BETTER CHANCE WILL BE ON FRIDAY AS A WEAK UPPER SHORTWAVE TROUGH INTERACTS WITH A MOIST AND UNSTABLE AIRMASS. THE DRYLINE WILL BE A PLAYER...BUT TO WHAT EXTENT IS UNCERTAIN AT THIS TIME. ENSEMBLE MODEL DATA SUGGESTS THAT THE STORM MODE WILL BE MULTICELLULAR GIVEN RELATIVELY WEAK EFFECTIVE BULK SHEAR AND EXPECTED MODEST MID-TROPOSPHERIC FLOW. PRECIP CHANCES TAPER OFF A BIT SATURDAY AND SUNDAY...BUT COULD INCREASE DEPENDING ON SUBTLE UPPER FEATURES ROTATING AROUND THE BASE OF THE NORTHWEST PACIFIC UPPER LOW. STILL LOOKS LIKE WE COULD SEE AN UPTICK IN RAIN CHANCES THE MIDDLE OF NEXT WEEK. HIGH TEMPERATURES FRIDAY WILL BE CLOSE TO NORMAL GIVEN CLOUDS...MOISTURE... AND EXPECTED OUTFLOW FROM THURSDAY`S STORMS...OTHERWISE LOOK FOR TEMPS TO BE A BIT ABOVE LATE MAY NORMS. && .MAF WATCHES/WARNINGS/ADVISORIES... NM...NONE. TX...NONE. && $$