443 FXUS63 KLBF 230544 AFDLBFArea Forecast Discussion National Weather Service North Platte NE 1244 AM CDT Tue Sep 23 2025
.KEY MESSAGES...
- Chance of showers and thunderstorms increasing by late afternoon and evening
- There is a potential for moderate to heavy rainfall overnight into Tuesday
- Cooler temperatures Tuesday with highs in the 60s to low 70s
- Drier conditions Wednesday through Monday
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.SHORT TERM /THROUGH WEDNESDAY/... Issued at 401 PM CDT Mon Sep 22 2025
The main concern in the short term will be the chance for showers and thunderstorms late this afternoon and evening with the potential for an isolated strong to severe thunderstorm. The 18z sounding from LBF did show a strong cap in place, which is leading to lower confidence in seeing convection this afternoon into the early evening. There are several boundaries in place to become the focus for convective development with a sfc trof across the Sandhills, a stationary front draped across the central Sandhills and a cold front moving in from the north into the northwest Sandhills and a deepening sfc low that is expected to move near the KS/NE border. Think the greatest potential for convection will be after the low level jet kicks in mid-evening as this will create enough lift across the boundaries. The severe potential remains low with marginal deep layer shear only around 20 to 25 kts, generally east of HWY 83 with lapse rates around 7 to 7.5 and CAPE values around 1000 J/kg, if a strong to severe thunderstorm were to develop it would be in this area, but given how strong the cap is, the threat is marginal. The main hazards would be strong winds, hail and moderate to heavy rainfall.
As the LLJ moves in this evening and interacts with the deepening low across the southwest and the cold front to the northwest, there could be two areas of potentially moderate to heavy rainfall. Should storms develop along the cold front across the northern/northwest Sandhills they will be slower moving and may produce moderate rainfall with rainfall amounts greater than a quarter inch up to half an inch. Southwest Nebraska will be the greatest focus for heavy rainfall, depending on where the deepening low sets up along with the frontal boundary moving southward stalls, there is the potential for training of thunderstorms and could see moderate to heavy rainfall of a quarter to half inch rainfall, with locally higher amounts. Rainfall is expected to linger into Tuesday afternoon.
Cooler temperatures are expected Tuesday with the cold front passage Monday/Tuesday along with rainy conditions across southwest Nebraska highs will generally be in the low to mid 60s across southwest Nebraska and into the low 70s across north central Nebraska.
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.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... Issued at 401 PM CDT Mon Sep 22 2025
An upper level ridge develops across the western CONUS and slowly moves eastward through the week. This will bring drier conditions, with no precipitation expected at this time, after Tuesday through the remainder of the long term forecast. Temperatures will also begin to moderate with highs reaching back to the 80s by late week.
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.AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1237 AM CDT Tue Sep 23 2025
Areas of showers and thunderstorms will trend to be more widespread across the area through the early morning hours and then tend to focus across southwest Nebraska after sunrise. Showers will likely linger south of I-80 into the afternoon hours. Winds will be variable near any storms, but a gradual north-northeast wind of 10-20 kts should prevail by sunrise and last through the daylight hours. Winds tonight will be light north to northwest.
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.LBF WATCHES/WARNINGS/ADVISORIES... None.
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SHORT TERM...Gomez LONG TERM...Gomez AVIATION...Taylor
NWS LBF Office Area Forecast Discussion