Area Forecast Discussion
Issued by NWS Omaha/Valley, NE

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000 FXUS63 KOAX 200800 AFDOAX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 300 AM CDT SUN JUL 20 2014 .SHORT TERM...(TODAY THROUGH TUESDAY) ISSUED AT 300 AM CDT SUN JUL 20 2014 ...HEAT INDEX VALUES SHOULD REACH ADVISORY CRITERIA BY MONDAY AND TUESDAY... OVERALL...ONGOING FORECAST REMAINS IN GOOD SHAPE WITH MINOR CHANGES EXPECTED THIS PACKAGE. MAIN CONCERNS WILL BE THE BUILDING HEAT OVER THE NEXT THREE DAYS...WITH OPPRESSIVE SURFACE DEWPOINTS EVENTUALLY RESULTING IN HEAT INDEX VALUES REACHING ADVISORY CRITERIA BOTH MONDAY AND TUESDAY. HIGHS TODAY SHOULD BE WARMER THAN YESTERDAY...REACHING THE MID 80S ACROSS WESTERN IOWA...TO THE LOWER 90S ACROSS EASTERN NEBRASKA. WHILE SURFACE DEWPOINTS DO REACH THE LOWER 70S TODAY MOST AREAS...HEAT INDEX VALUES WILL REMAIN GENERALLY BELOW 100. TEMPS MONDAY SHOULD CLIMB INTO THE MID TO UPPER 90S MONDAY WHEN DEWPOINTS SURGE INTO THE MID 70S AS CORN EVAPOTRANSPIRATION REALLY KICKS IN. THIS WILL RESULT IN HEAT INDEX VALUES FROM 105 TO 109 IN MOST AREAS ON MONDAY. VERY MUGGY AND HUMID CONDITIONS PERSIST INTO MONDAY NIGHT WITH TEMPS ONLY DROPPING INTO THE MID TO UPPER 70S. A WEAK FRONT MOVES INTO THE AREA ON TUESDAY. ALONG AND AHEAD OF THE FRONT...HIGHS WILL AGAIN BE IN THE 95 TO 100 DEGREE RANGE...AGAIN WITH ANOTHER DAY OF OPPRESSIVE HUMIDITY AND HEAT INDEX VALUES FROM 105 TO 109 IN THE AFTERNOON. WE HAVE HIGHLIGHTED THE BUILDING HEAT THE LAST COUPLE OF DAYS...AND WILL LIKELY BE ISSUING HEAT ADVISORIES LATER IN THE DAY ON SUNDAY OR SUNDAY NIGHT FOR MONDAY/TUESDAY. REGARDING PRECIPITATION...OPTED TO PULL THE SLIGHT CHANCE OF THUNDERSTORMS EARLY THIS MORNING SINCE THEY ARE NOT MATERIALIZING...IN THE ABSENCE OF ANY SIGNIFICANT FORCING. STILL HAVE SOME CONCERN THAT ISOLATED SHOWERS/STORMS COULD DEVELOP TONIGHT IN THE MID MISSOURI RIVER VALLEY AS THE AREA WILL BE WITHIN THE NOSE OF A WEST/SOUTHWEST LOW LEVEL JET...WITH AN INCREASE IN LOW/MID LEVEL MOISTURE NOTED. THE ECMWF IS THE ONLY MODEL THAT REMAINS DRY TONIGHT. A HEALTHY CAP WILL ALSO EXIST OVERNIGHT...THUS UNSURE IF THERE`S ENOUGH FORCING FROM THE LLJ ALONE TO TRIGGER ANYTHING...AND WILL DEFER TO THE LATER COMPUTER MODELS TO SEE IF THEY MAINTAIN THEIR WET TRENDS. BEST CHANCE FOR CONVECTION STILL APPEARS TO BE MONDAY NIGHT AHEAD OF THE COLD FRONT...WITH THE CONVERGENCE ALONG THE NOSE OF THE LOW LEVEL JET...COMBINED WITH A VERY SUBTLE WAVE ALOFT COULD TRIGGER ISOLATED STORMS...THAT COULD ALSO LINGER THROUGH THE DAY TUESDAY AS THE COLD FRONT MOVES INTO THE REGION. .LONG TERM...(TUESDAY NIGHT THROUGH SATURDAY) ISSUED AT 300 AM CDT SUN JUL 20 2014 COLD FRONT ALONG OR JUST SOUTH OF I80 TUESDAY EVENING COULD CONTINUE TO TRIGGER ISOLATED STORMS MAINLY TUESDAY EVENING IN SOUTHEAST NE/SOUTHWEST IOWA. SOMEWHAT LESS HUMID AIR AND COOLER TEMPS THEN SETTLE OVER THE REGION ON THURSDAY BEHIND THE FRONT WITH DRY WEATHER EXPECTED. THE UPPER RIDGE REMAINS FIRMLY IN PLACE ACROSS THE SOUTHWEST US THROUGH THE REMAINDER OF THE FORECAST PERIOD. A COUPLE OF RIDGE RIDER SYSTEMS COULD AFFECT THE AREA THURSDAY THROUGH FRIDAY WITH SMALL THUNDERSTORM CHANCES. SATURDAY APPEARS DRY AT THIS TIME. && .AVIATION...(06Z TAFS FOR KOFK...KLNK AND KOMA.) ISSUED AT 1108 PM CDT SAT JUL 19 2014 LATE NIGHT THUNDERSTORM CHANCES CONTINUE TO BE TOO LOW TO INCLUDE IN TAF FORECASTS AND IN FACT POPS WERE REDUCED FURTHER IN GRIDS AS WELL. LATE NIGHT/EARLY MORNING STRATUS AND PATCHY FOG REMAINS POSSIBLE...ESPECIALLY NEAR KOFK...BUT CONDITIONS APPEARED A LITTLE LESS FAVORABLE THAN YDA AT THIS TIME. SO JUST CONTINUED WITH A TEMPO 6SM BR SCT010 GROUP AT KOFK FOR NOW. OTHERWISE WOULD EXPECT LESS IN THE WAY IN VFR OR HIGH MVFR CIGS AT TAF SITES SUNDAY AS SOUTH WINDS INCREASE AGAIN. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...NONE. IA...NONE. && $$ SHORT TERM...DEWALD LONG TERM...DEWALD AVIATION...CHERMOK

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