Forecast Discussion
NWS Omaha/Valley, NE

584
FXUS63 KOAX 190447
AFDOAX

Area Forecast Discussion
National Weather Service Omaha/Valley NE
1147 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, re-amplifying
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 /06Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 1143 PM CDT Mon May 18 2026

IFR to MVFR ceilings are in place at the terminals this
evening, with breezy northwesterly winds gusting to 20-25 kts
expected to last through the overnight hours. Radar data carried
forward by the short-term model is indicating that areas of
drizzle will continue to develop/move to the east of the area,
affecting KOMA to dip into MVFR visibilities at times through
08z. Otherwise, expect slight improvement to ceilings overnight,
with sustained winds loosening after sunrise, with winds
turning increasingly northerly while dropping gusts completely
around or shortly before 00z tomorrow.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...None.
IA...None.

&&

$$

DISCUSSION...McCoy
AVIATION...Petersen

NWS OAX Office Area Forecast Discussion

Forecast Discussion
NWS Hastings, NE

283
FXUS63 KGID 190631
AFDGID

Area Forecast Discussion
National Weather Service Hastings NE
131 AM CDT Tue May 19 2026

.KEY MESSAGES...

- The next chance of precipitation will come Wednesday (20-30%)
  and Wednesday night (40-70%). A mix of showers and non-severe
  thunderstorms may deposit up to 0.1-0.5" of precipitation.

- Periodic thunderstorm chances return each day between
  Wednesday and Sunday.

- Highs through Thursday will remain in the upper 50s to mid
  60s. A multi-day gradual warm up back to the 80s will then
  transpire over the weekend.

- A few patchy areas of front will be possible Tuesday night
  into Wednesday morning for mainly Valley, Greeley, Sherman,
  Howard and Nance counties.

&&

.UPDATE...
Issued at 129 AM CDT Tue May 19 2026


Today we will finally take a pause from the mention of severe
weather as there will be no chance for any sort of precipitation
today. A more stable and cooler airmass has now blanketed the area
and will keep conditions generally more quiet for the next few days.
Winds this morning blowing out of the north to northwest between 15-
20MPH and gusting as high as 25-30MPH, will gradually slow down
later this afternoon and evening as higher pressure filters in near
the surface.

Highs through Thursday will mainly stay in the upper 50s to mid 60s
with overnight lows returning back to the mid 30s and 40s for the
next at least three nights. The potential for frost will make its
return back to possibly a limited northern portion of the area
Tuesday night. With lows nearing the mid 30s and with calming
overnight winds, frost formation could be possible in a handful of
locations north of I-80 (mainly across Valley, Greeley, Sherman,
Howard and Nance counties). If this trend continues, a Frost
Advisory will need to be considered for these locations overnight
Tuesday.

The next chance for precipitation will not come until Wednesday as
the next low amplitude shortwave trough wobbles through the Central
Plains region. A few AM showers could pass near to just west of the
area (20-30% precipitation chance). The better precipitation
potential (40-70% chances) will come later Wednesday night as a mix
of shower and non-severe thunderstorms move into central portions of
Kansas/Nebraska. Given the cooler temperatures, a weaker CAPE
profile (

NWS GID Office Area Forecast Discussion