868
FXUS63 KOAX 220404
AFDOAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1104 PM CDT FRI AUG 21 2026
KEY MESSAGES
- MORE STORMS MAY DEVELOP WEST OF A NELIGH TO WAHOO TO NEMAHA
LINE (20-40% CHANCE) AFTER MIDNIGHT.
- STORMS CLEAR LATE SATURDAY MORNING LEAVING A PLEASANT DAY.
- PERIODIC STORM CHANCES CONTINUE INTO NEXT WEEK.
DISCUSSION
ISSUED AT 1105 PM CDT FRI AUG 21 2026
HEY, I DID SFC ANALYSIS BY HAND TONIGHT! IT REVEALS A STALLED
FRONT DRAPED FROM NEAR CLARINDA, THROUGH THE OMAHA METRO, TO
ALBION AND CONTINUING WEST.
WIDELY ISOLATED SHOWERS CONTINUE ACROSS THE AREA THIS EVENING,
BUT SEVERE WEATHER NEVER DID MATERIALIZE HERE DESPITE THE
CONDITIONAL THREAT EARLIER TODAY. THE ATMOSPHERE HAD THE
BUOYANCY AND SHEAR AVAILABLE, BUT DUE TO CLOUD COVER,
INITIATION DIDN'T HAPPEN IN NEBRASKA. A FEW LIGHT SHOWERS
LINGERED PAST SUNSET IN FAR SOUTHWEST IOWA ALONG AN ELEVATED
FRONT.
EXPECT THE MOSTLY DRY CONDITIONS MAY BE INTERRUPTED BY
REDEVELOPMENT AROUND 2:00 AM AS A H5 SHORTWAVE PUSHES SOUTHEAST
THROUGH CENTRAL NEBRASKA. ELEVATED CAPE PEAKS ONLY AT ABOUT
1,000 J/KG AND EFFECTIVE SHEAR VALUES WILL BE NERFED AFTER THE
SUBTRACTION OF THE BOUNDARY LAYER (50 KTS END UP CLOSER TO 25
KNOTS). THE LLJ IS WEAK AND POINTED FARTHER WEST THAN USUAL.
THE 22Z SSCRAM SUGGESTS LESS THAN A 5% CHANCE OF SEVERE HAIL OR
WIND OVERNIGHT. THAT MIGHT BE A LITTLE LOW, BUT IT'S GOT THE
RIGHT IDEA. HAVE POPS PEAKING NEAR 30% AT 6AM IN THE SW 1/4TH OF
THE CWA BEFORE WRAPPING UP BY 9AM. OMAHA, NORFOLK, AND POINTS
NORTH AND EAST SHOULD REMAIN DRY.
SATURDAY
THE REMAINDER OF SATURDAY WILL BE DRY WITH SUNNY SKIES BY NOON.
AS THE SFC PRESSURE AXIS PUSHES THROUGH, LIGHT NORTHERLY WINDS
WILL SLOWLY BECOME EASTERLY BY MIDNIGHT. IT'LL BE A GREAT DAY
TO GET SOME YARD WORK DONE. DARN IT.
SUNDAY
POPS 45% (WEST) RETURN ON SUNDAY WITH A SHORTWAVE ROUNDING THE
H5 RIDGE. MOST WILL REMAIN DRY, BUT WITH THE ASSOCIATED CLOUD
COVER, TEMPS WILL SLIP BY ABOUT 5 DEGREES. POPS 40% (SOUTH) TO
70% (NORTH) CLIMB HIGHER AFTER MIDNIGHT, WHEN 00Z GUIDANCE
SUGGESTS A CONVECTIVE COMPLEX PUSHES THROUGH SD IN THE EVENING
AND INTO EASTERN NEBRASKA / WESTERN IOWA BEFORE SUNRISE MONDAY
MORNING.
NEXT WEEK
THE BUSY PATTERN CONTINUES. TO DATE, OAX HAS ISSUED ITS FOURTH
MOST T-STORM WARNINGS THIS YEAR (POR 1986).
TRANSIENT RIDGING AHEAD OF A CUTOFF LOW TRAVERSING THE PRAIRIE
PROVINCES ALLOWS TEMPS TO CLIMB A BIT FOR MONDAY AND TUESDAY.
THAT LOW'S ATTENDANT COLD FRONT PUSHES THROUGH ON TUESDAY
AFTERNOON. THIS WILL BRING ANOTHER 40% CHANCE OF OVERNIGHT
THUNDERSTORMS THANKS TO THE STALLED FRONT AND ISENTROPIC UPGLIDE
PROVIDED BY THE LLJ.
12Z GLOBAL MODELS SUGGEST REGULAR CHANCE OF PRECIP AND THUNDER
THROUGH THE WORK WEEK AS THE AREA REMAINS ON THE PERIPHERY OF
THE SOUTHERN HIGH PRESSURE DOME. LOOKING FOR SOME CHANGE TO HANG
YOUR HOPES ON? ALL THREE DETERMINISTIC GLOBAL MODELS DEVELOP
ZONAL FLOW BY NEXT WEEKEND.
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/
ISSUED AT 552 PM CDT FRI AUG 21 2026
VFR CONDITIONS ARE EXPECTED THROUGH THE REMAINDER OF THE PERIOD
AS DRIER WEATHER BUILDS INTO THE AREA. EXPECT A 20-40% CHANCE
OF THUNDERSTORMS IN THE VICINITY OF KLNK OVERNIGHT TONIGHT. HAVE
ADDED VCTS FROM 5AM TO 8AM THERE. HOPE TO HAVE A BETTER IDEA OF
TIMING AND LIKELIHOOD WITH 06Z ISSUANCE.
OAX WATCHES/WARNINGS/ADVISORIES
NE...NONE.
IA...NONE.
DISCUSSION...NICOLAISEN
AVIATION...NICOLAISEN
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