194
FXUS63 KOAX 190412
AFDOAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1112 PM CDT FRI SEP 18 2026
KEY MESSAGES
- SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVERNIGHT.
SEVERE WEATHER IS NOT EXPECTED.
- COOLER AND CLOUDY CONDITIONS EXPECTED ON SATURDAY WITH
ADDITIONAL SHOWERS AND STORMS POSSIBLE (30% CHANCE) ACROSS
EXTREME SOUTHEAST NE AND SOUTHWEST IA SATURDAY EVENING.
- COOLER CONDITIONS EXPECTED INTO THE WORK WEEK, WITH HIGHS
GENERALLY IN THE 60S AND PERIODIC PRECIPITATION CHANCES.
DISCUSSION
ISSUED AT 1112 PM CDT FRI SEP 18 2026
TONIGHT AND SATURDAY...
WATER VAPOR IMAGERY AND OBJECTIVE ANALYSIS THIS EVENING DISPLAYS A
MID-LEVEL RIDGE CENTERED OVER THE LOWER MISSISSIPPI VALLEY WITH
TROUGHING MOVING INTO THE INTERMOUNTAIN WEST. A SHORTWAVE
DISTURBANCE PUSHING THE CENTRAL/NORTHERN PLAINS HAS SPUN UP A
SURFACE LOW OVER WESTERN NEBRASKA EARLIER TODAY. THROUGH THE DAY,
THE LOW TRAVERSED EASTWARD ACROSS THE NE/SD BORDER BEFORE PROGRESSING
INTO CENTRAL IOWA BY MID-DAY SATURDAY. THE FEATURE HELPED TO PULL A
WARM FRONT NORTH INTO THE AREA AND ALLOW HIGH TEMPERATURES TO CLIMB
INTO THE LOW TO MID 90S TODAY WITH DEWPOINTS PULLING INTO THE LOW
70S.
STORM DEVELOPMENT OCCURRED THIS EVENING ALONG A SURFACE TROUGH
PUSHING INTO EASTERN NEBRASKA. WHILE LOW-LEVEL HODOGRAPHS REMAINED
RATHER IMPRESSIVE THANKS TO THE LLJ, WEAK DEEP LAYER SHEAR (20-25
KTS) LIMITED STORM ORGANIZATION. WHILE MODEL SOUNDINGS EXHIBITED
3000-3500 J/KG OF MUCAPE, DRY LOW-LEVELS AND CAPPING LIMITED THE
AMOUNT OF INSTABILITY AND LOW-LEVEL SHEAR AVAILABLE TO STORM. WITH
THIS IN MIND, STORMS REMAINED GENERALLY SHORT-LIVED AND PRONE TO
ISOLATED POCKETS OF STRONG WIND GUSTS (40-45 MPH) AS STORMS QUICKLY
COLLAPSED AND ALLOWED FOR SOME GUSTY WINDS.
A REINFORCING COLD FRONT WILL SAG SOUTHWARD BEHIND THE SURFACE
TROUGH TONIGHT, HELPING TO SPARK ADDITIONAL SCATTERED THUNDERSTORMS
ALONG AND BEHIND THE FRONT. INSTABILITY WILL TAPER OFF THROUGH THE
OVERNIGHT PERIOD, LIMITING ADDITIONAL POTENTIAL FOR STRONG TO SEVERE
STORMS. STORM COVERAGE WILL GRADUALLY DECREASE AFTER DAYBREAK, WITH
SPOTTY RAINFALL TOTALS APPROACHING 0.50-1.00" UNDER ANY HEAVIER
OVERNIGHT SHOWERS.
A MUCH COOLER POST-FRONTAL AIRMASS WILL SINK INTO THE AREA ON
SATURDAY BEHIND THE COLD FRONT, WITH HIGH TEMPERATURES ONLY EXPECTED
TO PEAK IN THE LOW 70S ACROSS NORTHEAST NEBRASKA WHERE THICK CLOUD
COVER REMAINS IN PLACE. HIGHS ARE EXPECTED TO INCREASE INTO THE MID
80S ACROSS SOUTHEAST NEBRASKA AND FAR SOUTHWEST IOWA, WHERE MORE
SUNSHINE WILL BE IN PLACE. ADDITIONAL STORM DEVELOPMENT IS POSSIBLE
SATURDAY EVENING ALONG THE FRONT IN EXTREME SOUTHEAST NE AND
SOUTHWEST IA. HOWEVER, MODEL GUIDANCE CONTINUES TO TREND TOWARDS THE
FRONT BEING SOUTH OF THE NE/KS LINE BEFORE STORMS INITIATE, KEEPING
ANY ADDITIONAL STORM CHANCES CAPPED AROUND 30%.
SUNDAY AND BEYOND...
A CHILLY AND DAMP START TO THE WEEK IS EXPECTED AS ANOTHER SHORTWAVE
DISTURBANCE PUSHES INTO THE NORTHERN PLAINS AND BRINGS ANOTHER SHOT
OF COOLER AIR AND ADDITIONAL PRECIPITATION CHANCES TO THE REGION.
HIGH TEMPERATURES ARE EXPECTED TO PEAK GENERALLY IN THE LOW 60S
SUNDAY THROUGH TUESDAY, WITH PERIODIC POPS OF 40-60%, PARTICULARLY
SUNDAY INTO MONDAY. A BREAK IN PRECIPITATION CHANCES IS EXPECTED
TUESDAY AND WEDNESDAY AS TRANSIENT, WEAK MID-LEVEL RIDGING SLIDES
ACROSS THE AREA BETWEEN DISTURBANCES. YET ANOTHER SHORTWAVE
DISTURBANCES IS EXPECTED TO TRACK INTO THE AREA BY THURSDAY,
BRINGING POPS OF 15-30%. HIGHS WILL REMAIN IN THE 60S THROUGH MUCH
OF THE WORK WEEK, WITH A FEW SPOTS REACHING 70 BY NEXT WEEKEND.
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
ISSUED AT 512 PM CDT FRI SEP 18 2026
VFR CONDITIONS PREVAIL THIS EVENING BEFORE A LINE OF
THUNDERSTORMS DEVELOPS ACROSS EAST-CENTRAL NEBRASKA AND SLOWLY
PUSHES SOUTH. INITIAL THUNDERSTORMS SHOULD REMAIN SOUTH OF KOFK,
WITH A 60% CHANCE OF IMPACTS AT KOMA AND KLNK. BRIEF GUSTY
WINDS (UP TO 40 KTS) AND PATCHY MVFR CONDITIONS ARE POSSIBLE
UNDER AND STRONGER STORMS. A BRIEF PERIOD OF LLWS WILL ALSO WORK
INTO KOMA AND KLNK THIS EVENING AS A 40-45 KT LLJ MOVES IN AT
FL017.
INTO THE OVERNIGHT PERIOD, A FRONT PUSHING SOUTH ACROSS THE AREA WILL
SHIFT WINDS FROM SOUTHERLY TO NORTHERLY. ADDITIONAL SCATTERED
SHOWERS, AND PERHAPS A THUNDERSTORM OR TWO, ARE POSSIBLE INTO
THE OVERNIGHT PERIOD. THE HIGHEST CHANCES OF IMPACTS ARE AT KOMA
AND KLNK (50% CHANCE), THOUGH EXACT TIME FRAME MAY NEED
REFINING. ADDITIONALLY, A DECK OF MVFR TO IFR CEILINGS, ALONG
WITH PATCHY VISIBILITY RESTRICTIONS, WILL SINK SOUTH INTO THE
AREA OVERNIGHT. CONFIDENCE IS HIGH THAT KOFK WILL SEE A
PROLONGED STRETCH OF MVFR TO IFR CONDITIONS, WITH LOWER CHANCES
(30-40%) FURTHER SOUTH TOWARDS KOMA AND KLNK.
OAX WATCHES/WARNINGS/ADVISORIES
NE...NONE.
IA...NONE.
DISCUSSION...WOOD
AVIATION...WOOD
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