Lamar, MO Weather

This Hazardous Weather Outlook is for portions of the Missouri Ozarks and extreme southeast Kansas.

Day one

Tonight.

No hazardous weather is expected at this time.

Days two through seven

Tuesday through Sunday.

No hazardous weather is expected at this time.

Spotter information statement

Spotter activation will not be needed through tonight.

More detailed information can be accessed at: http://www.weather.gov/sgf/dsspacket

This product in graphical format: along with other weather: hydrological and climate information: at http://www.weather.gov/sgf

Key messages

- Warm and mostly dry through the week. Temperatures will be around 10 to 15 degrees above average.

- Halloween weekend may be a wet one, with rain chances increasing to 35-50% Friday night and remaining elevated through Saturday.

Short term

Issued at 114 PM CDT Mon Oct 26 2026

Synoptic and Mesoscale Overview:

Upper-air analysis reveals (at least) three shortwaves embedded within the larger longwave trough over the western CONUS as the ridge axis that has kept our weather dry lately shifts east this afternoon. A surface low was situated over northwest Kansas with a warm front extending east into northern Missouri and a diffuse cold front to the south into the Texas panhandle. Scattered mid and high clouds across eastern Missouri are shifting to the east with the ridge, resulting in clearing skies today.

Warm and Mostly Dry through the Week:

A lack of deep synoptic-scale ascent and modest moisture return will limit rain chances in the Missouri Ozarks through Thursday. Global models exhibit consensus in lifting a pair of shortwaves through the Plains Tuesday through Thursday, which will act to force a few showers and perhaps a thunderstorm ahead of a surface cold front across eastern Kansas and northern Missouri. It's possible a few light showers or sprinkles could spread into our far northwestern CWA Tuesday night and again Thursday morning, but chances remain low (10-20%), and most areas will remain completely dry.

Southerly winds and warm air advection will keep temperatures above the climatological average through the short term. Wednesday and Thursday will likely be the warmest days of the forecast period as weak ridging takes hold behind the aforementioned shortwaves. Forecast highs in the upper 70s to low 80s are around 15 degrees above average for this time of year.

Long term

Issued at 114 PM CDT Mon Oct 26 2026

Guidance continues to suggest that the train of shortwaves undercutting the ridging across the eastern CONUS will see its next push on Thursday night, with rain chances progressively invading further south by Friday evening. Daytime rain chances on Friday remain fairly low at this point due to the ensemble predictability limit, with 15-20% PoPs staying west of I-49 during the day, but as higher-resolution regional guidance begins to get into range through the week, these PoPs will likely become more refined spatially and temporally as mesoscale influences and the location of the shortwaves become better resolved.

Global ensembles and deterministic models remain well in agreement that the eventual breakdown of the ridge and widespread precip chances will be here by Friday night and Saturday, with an upper- level low lifting into the Southern Plains overnight Friday into Saturday. As a result, broad-brushed 35-50% rain chances on Saturday (Halloween)currently spread across the entire forecast area. It is possible at this point that Saturday does not remain a complete washout depending on the finer-scale details that are not yet resolved by longer range models, but because of the lack of certainty in placement, timing, and intensity of the wave due to how far out in the forecast period Saturday still is, we don't have many other details to report for the trick-or-treat forecast at this time, so stay tuned through the week as details become more clear.

As far as temperatures go, cloud cover associated with the shortwaves/rainfall will have the potential to limit temperatures some over the weekend. Signals don't currently suggest there will be significant air mass modification (aka, a cold frontal passage) as the shortwave moves through Friday night/Saturday, so cloud cover and rainfall will be the primary factor to monitor as far as temperatures go this weekend, otherwise remaining relatively steady. However, this also means there won't be a major drop in temperatures, so current guidance suggesting highs between 65-75 degrees seems like a fairly safe bet, even at such an extended time range.

Aviation

Issued at 505 PM CDT Mon Oct 26 2026

VFR conditions through the TAF period.

Scattered to broken high clouds will move into western Missouri this evening and persist into Tuesday. Winds will generally prevail out of the south but may take on more of a southeasterly component on occasion, likely remaining less than 15 kt.

Watches, warnings and advisories

KS: None. MO: None.