580
FXUS63 KOAX 190350
AFDOAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1050 PM CDT MON MAY 18 2026
KEY MESSAGES
- COOLER WEATHER MOVES IN ON TUESDAY WITH POTENTIAL FOR MORNING
FROST FOR NORTHEAST NEBRASKA ON WEDNESDAY.
- SHOWER/THUNDERSTORM CHANCES RETURN WEDNESDAY NIGHT INTO
THURSDAY CONTINUING ON/OFF THROUGH FRIDAY.
- TREND BACK TOWARD WARMER TEMPERATURES OVER THE WEEKEND.
DISCUSSION
ISSUED AT 1050 PM CDT MON MAY 18 2026
SEVERE WEATHER HAS CLEARED TO THE SOUTHEAST THIS EVENING LEAVING
COOL, CLOUDY CONDITIONS IN PLACE FOR THE OVERNIGHT HOURS. WE
HAVE A LARGE TEMPERATURE GRADIENT ACROSS THE AREA WITH
TEMPERATURES IN THE UPPER 40S ACROSS NORTHEAST NEBRASKA, TO
LOW-TO-MID 60S IN SOUTHWEST IOWA AND FAR SOUTHEAST NEBRASKA. THE
HRRR CONTINUES TO SHOW SOME POTENTIAL FOR A COUPLE ADDITIONAL
STORMS DEVELOPING OVER FAR SOUTHEAST NEBRASKA AND SOUTHWEST IOWA
AROUND MIDNIGHT TONIGHT. IF ANYTHING WERE TO DEVELOP, IT LIKELY
WOULDN'T BE SEVERE.
SKIES WILL BE CLEARING TUESDAY MORNING AS HIGH PRESSURE BUILDS
OVER THE AREA. COOLER AIR MASS REMAINS IN PLACE UNDER NORTHERLY
FLOW. OVERNIGHT TUESDAY NIGHT INTO EARLY WEDNESDAY WE LIGHT
WINDS AND CLEAR SKIES CONTRIBUTE TO TEMPERATURES DROPPING INTO
THE LOW-TO-MID 30S ACROSS NORTHEAST NEBRASKA, POSSIBLY
NECESSITATING A FROST ADVISORY FOR THIS AREA. PLACES MORE ACROSS
SOUTHEAST NEBRASKA AND SOUTHWEST IOWA WILL SEE TEMPERATURES DROP
INTO THE UPPER 30S TO LOW 40S, THOUGH A FEW OUTLYING AREAS
AROUND OMAHA AND LINCOLN COULD STILL SEE SOME PATCHY FROST.
HIGH PRESSURE REMAINS CENTERED OVER THE REGION ON WEDNESDAY
KEEPING TEMPERATURES COOLER THAN NORMAL WITH HIGHS IN THE UPPER
50S TO LOW 60S. THE TROUGH OVER THE NORTHERN ROCKIES STARTS TO
DEEPEN ON WEDNESDAY, RE-AMPLIFYING SOUTHWESTERLY FLOW ACROSS
OUR REGION. THIS WILL BRING MOISTURE BACK TO OUR AREA WITH
INCREASING CLOUDS INTO THE AFTERNOON.
RAIN CHANCES RETURN LATE WEDNESDAY INTO THURSDAY AS THE TROUGH
OVER THE NORTHERN ROCKIES STARTS TO DEEPEN, REAMPLIFYING
SOUTHWESTERLY FLOW ACROSS OUR REGION WHICH WILL LEAD BACK TO
MOISTURE ADVECTING BACK INTO OUR AREA FROM THE GULF. AS A WARM
FRONT LIFTS INTO NORTHERN KANSAS ON WEDNESDAY, WE SEE ISENTROPIC
UPGLIDE OVER OUR AREA LEAD TO SHOWER AND STORM DEVELOPMENT
STARTING WEDNESDAY NIGHT CONTINUING INTO THURSDAY. WE DON'T
ACTUALLY SEE THE WARM FRONT LIFT INTO OUR AREA UNTIL FRIDAY,
KEEPING TEMPERATURES COOL ON THURSDAY AS WELL.
FRIDAY THE WARM FRONT LIFTS NORTH, GETTING WRAPPED UP INTO A
DEVELOPING SURFACE LOW OVER THE NORTHERN PLAINS. THIS WILL
REINVIGORATING SHOWER AND STORM CHANCES THROUGH THE MORNING
HOURS. WE MAY SEE A SMALL WINDOW OF CLEARING BEFORE THE COLD
FRONT ARRIVES FRIDAY AFTERNOON/EVENING. WE SHOULD WATCH THIS
PERIOD WITH SOME POTENTIAL FOR SEVERE STORMS, BUT AT THIS TIME
THERE IS STILL A LOT OF UNCERTAINTY SURROUNDING THE DETAILS OF
THIS SYSTEM.
CONFIDENCE SIGNIFICANTLY DECREASES IN THE FORECAST GOING INTO
NEXT WEEKEND AS SIGNIFICANT DIFFERENCES IN THE FORECAST OF THE
UPPER-LEVEL PATTERN DEVELOP. ENSEMBLES SUGGEST A TREND BACK
TOWARD WARMER-THAN-NORMAL TEMPERATURES TOWARD THE LATTER-HALF OF
THE WEEKEND WITH LOW CHANCES FOR STORMS POSSIBLE SATURDAY AND
SUNDAY.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
ISSUED AT 1244 PM CDT MON MAY 18 2026
WIDESPREAD IFR/MVFR CEILINGS ARE OBSERVED ACROSS TERMINALS THIS
AFTERNOON. WILL SEE AN AREA OF SCATTERED SHOWERS AND STORMS
OVERSPREAD KLNK AND KOMA AFTER 21Z. HAVE REFINED TIMING A BIT WITH
THIS ISSUANCE, BUT EXPECT FURTHER REFINEMENTS AND ADJUSTMENTS.
STORMS THAT AFFECT TERMINALS WILL LIKELY BECOME SEVERE WITH STRONG
WINDS, VERY LARGE HAIL, AND THE POTENTIAL FOR A TORNADO. HAVE ADDED
A TRANSITION TO -SHRA AT KOMA AND KLNK AFTER 01/02Z. CEILINGS WILL
BOUNCE BETWEEN MVFR/IFR OVERNIGHT, BEFORE LARGELY BECOMING MVFR LATE
IN THE TAF PERIOD. WINDS FROM THE NORTH NORTHEAST WILL TURN TO THE
NORTH NORTHWEST THIS EVENING, WITH GUSTS GRADUALLY INCREASING TO 25
TO 30 KTS, PERSISTING FOR THE REST OF THE TAF CYCLE.
OAX WATCHES/WARNINGS/ADVISORIES
NE...NONE.
IA...NONE.
DISCUSSION...MCCOY
AVIATION...CASTILLO
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