442 FXUS64 KLUB 060541 AFDLUBArea Forecast Discussion National Weather Service Lubbock TX 1241 AM CDT Sat Sep 6 2025
...New SHORT TERM, LONG TERM, AVIATION...
.KEY MESSAGES... Updated at 1229 AM CDT Sat Sep 6 2025
- Isolated thunderstorms will be possible near the New Mexico state line this afternoon and evening.
- Chances for showers and thunderstorms will continue Sunday into early Monday morning.
- A drying and warming trend is forecast next week.
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.SHORT TERM... (Today and tonight) Issued at 1229 AM CDT Sat Sep 6 2025
02Z upper air analysis depicts a slow-moving, longwave trough over the Upper Midwest and into the northeastern U.S., with a subtropical ridge centered over central Mexico. The CWA was beneath a belt of zonal flow, where a broad field of moist, isentropic ascent associated with the monsoon continues to advect eastward over the region. The confluence region of the jet streak(s) was advecting over the southern Rocky Mountains, with moist ascent becoming increasingly scant in the low-levels. Isolated-to-widely-scattered rain showers will continue through early Saturday morning, as the theta surfaces over the CWA will take some time to dry out following the eastward translation of the longwave troughing. Hourly WTM observations have measured, on average, a few hundredths of an inch of rain, but there have been a few instances of thunderstorms which have produced a few tenths of an inch. The potential for lightning will continue to wane into the nighttime hours as the columns gradually dry out and updrafts fail to reach heights high enough to generate lightning.
At the surface, the synoptic cold front was located across the southern South and Rolling Plains. Brisk, northeasterly winds are ongoing; and winds were raised a few kt to account for the breeze, which will continue through Saturday morning. Surface winds will diminish after sunrise, as a weak anticyclone rotates into central N TX, with winds becoming east-southeast by Saturday afternoon. Thick overcast will persist throughout the day Saturday, restricting the effects of diabatic heating, with highs struggling to rise out of the middle 70s area-wide. High temperatures were lowered slightly, especially as light rain showers and/or sprinkles will result in enough evaporative/wet-bulb cooling of the columns to keep highs on the cooler side.
Otherwise, storm chances of any kind are expected to be near or west of the NM state line through the evening hours Saturday. After sunset, a few diurnally-driven storms may propagate into the western South Plains during the overnight hours into Sunday morning. Should this come to fruition, a similar convective mode will occur, i.e., mainly rain showers, as the cells gradually weaken. Low PoPs have been maintained with this assessment, as some moist ascent in the low-levels will remain intact, albeit weak.
Sincavage
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.LONG TERM... (Sunday through Friday) Issued at 1229 AM CDT Sat Sep 6 2025
In the mid/upper-levels, the subtropical ridge will steadily amplify over the southern Rocky Mountains, orienting the flow throughout the steering layer towards the northwest. As the concavity of the apex of the subtropical jet streak increases, a few vorticity lobes are forecast to propagate southeastward along the downstream tranche of the jet streak and eject into the southern Great Plains. These vorticity lobes will generate diurnally-driven storms over the higher terrain to the northwest of the CWA, with the potential for storms to propagate into portions of the Caprock during the afternoon and evening hours. Changes in geopotential height tendencies will remain nearly steady, but the net increase in northwesterly flow aloft will allow some degree of mid-level cooling to maintain low storm chances through the evening hours Sunday. The coverage of storms will be offset by increasing subsidence over W TX, with low chances confined across the northern zones throughout the overnight hours into Monday morning. High temperatures for Sunday will certainly rebound by a couple of degrees, as the overcast is forecast to thin out, although a surface-based cu field will bubble where breaks in the deck occur. The low PoPs generated by the NBM for Monday afternoon were removed, with a dry forecast maintained through the middle of next week due to the eastward shift in the subtropical ridge. The subsidence associated with the ridge will nix storm chances and result in a gradual warm-up, with highs returning to the middle 90s area-wide by the middle of next week.
Sincavage
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.AVIATION... (06Z TAFS) Issued at 1229 AM CDT Sat Sep 6 2025
Low CIGs and east winds are likely to persist through the rest of the overnight period, but confidence in which flight category will prevail is low. Periods of IFR CIGs appear most likely at LBB and PVW through at least mid-morning, but occasional rises to MVFR or even VFR are also possible overnight at both sites. For now will carry a pessimistic TAF and will amend as necessary. CDS currently is expected to bounce between MVFR and VFR overnight. By mid- morning, conditions are expected to begin improving with VFR likely to return to all terminals this afternoon as surface winds turn more southerly. Isolated SHRA will also persist over the next several hours, but terminal impacts from precipitation appear unlikely at this time.
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.LUB WATCHES/WARNINGS/ADVISORIES... None. &&
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SHORT TERM...09 LONG TERM....09 AVIATION...30
NWS LUB Office Area Forecast Discussion