USA Weather Alert Today October 29 2026: WPC Short Range Forecast Discussion - Heavy Rainfall and Flash Flooding Threats Expand Across Southern High Plains and Southwest Through Friday, Mountain Snow Cascades & Northern Rockies, Cold Front Mississippi Valley to Northeast - Full National Report

Breaking USA weather alert today - If you are searching for usa weather alert today, usa weather update today, this week weather usa, WPC short range forecast discussion, WPC public discussion, heavy rainfall flash flooding threat, excessive rainfall outlook, winter weather forecast discussion, mountain snow Cascades, Sierra Nevada snow forecast, this article gives you 100% real, fresh, unique content for today Oct 29 2026. This post is different from previous posts about 19 states severe thunderstorm warning, California coastal flood king tides record 8 ft and Florida coastal flood, Washington Cascades 12 inch snow alert, Halloween weekend forecast trick or treat rain, excessive rainfall risk Texas Southwest atmospheric river 5 day forecast, freeze warning early winter snow 15 inches Alaska, travel alert road closures flight delays 1685 delays Chicago O'Hare LA Phoenix, high wind warning and marine alert 9.7M under wind advisory gale warning small craft advisory, El Nino king tides science explained why 8.5 ft tide, and tropical storm Vance remnants and Typhoon Champi In-Fa impact. This time focus is on WPC Short Range Public Discussion and Winter Weather Forecast Discussion issued Oct 28-29 2026 which is most searched official forecast discussion topic in USA today.

WPC's Short Range Public Discussion Valid Oct 29-31 2026 - Official

Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 203 PM EDT Wed Oct 28 2026 Valid 00Z Thu Oct 29 2026 - 00Z Sat Oct 31 2026 Heavy rainfall and flash flooding threats to expand across Southern High Plains and Southwest through Friday A progressive cold front will bring showers and thunderstorms from Mississippi Valley to parts of Northeast Accumulating mountain snow in Cascades and Northern Rockies while unseasonable warmth dominates East.

Multi-day heavy rainfall and flash flooding threat will unfold across portions Southern High Plains and Southwest through end week.

Convective rain rates reaching 1.5 to 2.5 inches per hour will be capable producing localized to scattered flash flooding particularly across urban drainages low-lying areas sensitive terrain As such there is high-end Slight Risk level 2 of 4 excessive rainfall across portions West and Central Texas on Thursday with Marginal Risk level 1 of 4 extending into southern New Mexico.

Across Northwest persistent onshore flow associated slow-moving surface frontal system will bring widespread precipitation into Pacific Northwest Northern Great Basin Northern Rockies through Friday Accumulating snow expected across higher elevations Washington and Oregon Cascades where several inches wet snow will create slick travel over mountain passes High-elevation snow and wintry mix will also extend into portions Northern Rockies.

Latest Update: Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Thu Oct 29 2026 Valid 00Z Fri Oct 30 2026 - 00Z Sun Nov 01 2026 Heavy rainfall likely across parts Southern Plains into Friday and Southwest on Friday and Saturday Moisture flowing into Southern Plains from Tropical Storm Vance will continue bring heavy rainfall threat to parts west and central Texas and Southeastern New Mexico Several inches rainfall possible through Friday for west-central Texas with lesser amounts extending northward into western Oklahoma as well WPC highlights large area from southeast New Mexico into west-central Texas within Slight Risk.

WPC Excessive Rainfall Outlook shows Slight Risk across parts south-central Arizona for Friday and Saturday with broader Marginal Risk from parts southern California to western Texas A deep upper low off Pacific Northwest coast will linger through period providing some moisture into this region Snow likely in mountains with over a foot snow in highest elevations mostly above 9000 feet Rain and Mountain snow will expand across West on Saturday as well.

Last Updated 357 PM EDT Thu Oct 29 2026.

Nation's Weather - Paul Poteet Summary

Snow will develop over parts higher elevations Cascades Northern Intermountain Region Northern Rockies on Thursday tapering off Friday There is Slight Risk excessive rainfall over parts Southern High Plains on Thursday and over parts Southwest on Friday and Saturday Quasi-stationary area low pressure just off Pacific Northwest Coast will stream moisture into Northwest Coast producing rain and highest elevation snow over Cascades Northern Intermountain Region Thursday into Friday evening.

System will produce rain with embedded thunderstorms over Upper Great Lakes rain over Lower Great Lakes through late Thursday night scattered light rain showers will develop over parts Northeast through Friday evening In addition upper-level energy will move over Southern High Plains creating heavy rain region Thursday into Friday Therefore WPC has issued Slight Risk level 2 of 4 excessive rainfall over Southern High Plains with these thunderstorms Thursday through Friday morning associated heavy rain will create mainly localized areas flash flooding with urban areas roads small streams narrow canyons gullies burn scars most vulnerable.

Moreover flow off Gulf California upper-level energy will aid producing showers thunderstorms heavy rain over Southwest on Friday WPC has issued Slight Risk level 2 of 4 excessive rainfall over Southwest with these thunderstorms Friday through Saturday morning Flow off Gulf California will continue Saturday creating heavy rain over parts Southwest far southeastern California Therefore WPC has issued Slight Risk level 2 of 4 excessive rainfall over parts Southwest far southeastern California Saturday into Sunday morning In addition as moisture moves northward over Great Basin rain with high-elevation snow will develop over parts Great Basin Northern Intermountain Region Central Rockies Friday into Saturday morning.

WPC's Winter Weather Forecast Discussion - Sierra Nevada into Intermountain West & Four Corners

Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 210 PM EDT Thu Oct 29 2026 Valid 00Z Fri Oct 30 2026 - 00Z Mon Nov 02 2026 Sierra Nevada into Intermountain West Four Corners Day 2-3

Impressive full-latitude upper trough represented by NAEFS height anomalies falling below 10th percentile along most Pacific Coast will gradually pivot eastward into early next week.

Moisture embedded within pronounced IVT plume peak IVT above 500 kg/m/s from West-WRF centered over Southwest will lift into increasing ascent resulting widespread precipitation D2 and D3 from southern CA through Northern Rockies WAA accompanying IVT will push snow levels to 9000-10000 ft across Intermountain West slightly lower 8000 ft in ID MT keeping most precipitation rain However accumulating snow likely higher elevations with periodic lowering snow levels to 7000-9000 ft near NBM 10th percentile varying with location thanks steep lapse rates aloft and some enhanced ascent through 700-600mb fgen and upslope forcing.

Some light snow possible D1 but general accumulating snow will occur primarily on D2 and D3 During this time higher elevations Sierra will be favored heaviest accumulation with 60% chance at least 12 inches with local maxima approaching 2 feet Additional heavy snow exceeding 6 inches likely greater than 60% across higher elevations Sawtooth of ID Uintas of UT San Juans of CO where locally 12+ possible All snow will likely be comprised less-than-climatological SLR leading substantial snow load impacts 20-50% chance at least moderate impacts due snow load from WSSI-P.

Probability significant ice across CONUS less than 10 percent.

Previous Discussion: WPC Winter Weather Forecast Discussion 150 PM EDT Wed Oct 28 2026 Valid 00Z Thu Oct 29 2026 - 00Z Sun Nov 01 2026 Northern Cascades and Northern Rockies Days 1-2 Closed mid-level low will spin just offshore WA coast into Friday with modest downstream divergence and shedding spokes vorticity driving ascent into Pacific and Interior Northwest from Olympics through Northern Rockies Although moisture will spread eastward within pinched flow SE mid-level feature PWs generally near normal and most intense ascent through synoptic forcing and upslope enhancement will be waning early D1 so total additional snowfall likely modest Waves precipitation falling as snow above generally 4000 ft will continue into at least Friday but intensity waning outside pockets convectively-enhanced precipitation driven mid-level instability steepening lapse rates beneath upper low Still additional snowfall likely modest as reflected just small pockets 50%+ probabilities 4 inches or more highest Olympics northern Cascades Northern Rockies vicinity Glacier NP.

Sierra into Four Corners Day 3 Although most winter precipitation associated next system will occur beyond current forecast period mostly D4+ some high-elevation snow will spread across Sierra into San Juans above 9000 ft before 00Z Sunday While snowfall D3 likely minimal extremely moist column will support anomalously low SLR with 10-30% chance at least minor impacts due snow load developing before expanding into D4 Probability significant ice less than 10 percent.

Day 1 WPC snow probs for greater than 6 inches are 30-80% above pass level with 20-40% probs greater than 4 inches The heaviest snow rates occur far northern Rockies generally north from Bitterroots today from around 16Z to 22Z per both recent HREF and REFS mean snowfall rate products with rates generally 0.5 to 1.5 inch per hour Day 1 WPC snow probs greater than 6 inches As noted above shortwave activity should produce additional snows over these areas into Saturday Day 2.5 snow probs greater than 4 inches.

US Hazards Outlook - Climate Prediction Center

Synopsis An area mid-level low pressure approaching West Coast predicted bring periods heavy precipitation high elevation snow high winds across parts Northern California through Pacific Northwest Another area low pressure forecast move across Atlantic coast states early week-2 bringing increased chances heavy precipitation high winds much region.

Hazards Slight risk heavy precipitation for portions Pacific Northwest northwestern California Sat-Wed Nov 7-11 Slight risk heavy snow for Cascades and Klamath Ranges Sat-Wed Nov 7-11 Slight risk high winds for coastal portions Pacific Northwest northwestern California coast Sat-Wed Nov 7-11 Slight risk heavy precipitation for most East Coast states Thu Nov 5 Slight risk high winds for Lower Great Lakes region Ohio Valley central and northern Appalachians Northeast Upper Mid-Atlantic Thu Nov 5.

Detailed Summary For Saturday October 31 - Wednesday November 04 For Thursday November 05 - Wednesday November 11 Mid-level trough forecast progress from southeastern Bering Sea into Gulf Alaska during first few days week-2 South of 50N considerably less precipitation forecast across Pacific Northwest northern portions California which is why regional moderate risks depicted past several days heavy precipitation heavy snow discontinued today Nevertheless slight risk heavy precipitation still indicated for those areas valid Nov 7-11 as onshore flow becomes established Liquid equivalent 3-day precipitation amounts indicated PETs to be 1.0-1.5 inches and greater than 85th historical percentile Farther inland slight risk heavy snow highest elevations Cascades Klamath Ranges valid same period An occluded low pressure system forecast move across Atlantic coast day 8 then offshore day 9 Slight chance heavy precipitation posted in advance associated cold front which includes most East Coast states on Nov 5.

WPC Extended Forecast Discussion Valid 12Z Sat Oct 31 2026 - 12Z Wed Nov 04 2026 Storm system will bring precipitation across West this weekend and into central US Monday-Tuesday Over weekend shortwave or two will push through warm mean upper ridge eastern half US combining with Pacific and Gulf moisture This will spread rain and thunderstorms across Mississippi Valley and East with moderate to heavy rain totals possible southern tier Meanwhile large upper trough forecast move through West and bring widespread precipitation there over weekend Forecast models indicate upper trough should make its way east and likely become closed Valley to Southeast over weekend and locally heavy rainfall possible as ample moisture combines with shortwave aloft Rain could also spread across Midwest to Ohio Valley eventually into East with generally modest amounts Ample moisture will spread into California Intermountain West ahead upper trough over weekend Heavy rain possible especially across Southwest while heavy snow possible higher elevations particularly San Juans central Rockies Colorado However details precipitation timing placement type including snow levels amounts all somewhat uncertain dependent upper-level and surface flow model differences so continue monitor future forecasts details could change Some rain should overspread much central US later Sunday and especially Monday as low strengthens including possibly heavy amounts Some northern central High Plains snow or rain snow mix cannot be ruled out on backside low.

Valid 12Z Fri Oct 30 2026 - 12Z Tue Nov 03 2026 Broadening precipitation coverage forecast across much lower 48 Late this week upper low near Pacific Northwest will anchor trough across West while shortwave moves through central US north west warm mean ridging Southeast central US shortwave combined Pacific and Gulf moisture will spread rain and thunderstorms across Plains Friday shifting across Mississippi Valley East over weekend with moderate to heavy rain totals possible southern tier Forecast models indicate upper trough should make its way across Intermountain West likely become closed low when reaches central US by next Tuesday This is forecast carry surface low frontal system bring widespread rain central US again early next week Rain and thunderstorms forecast continue across southern Plains into Friday with shortwave aloft lingering tropical moisture This rainy stormy pattern will move east across southeastern US into weekend and locally heavy rain possible One round precipitation forecast across Intermountain West Southwest Friday ahead upper trough axis Heavy rain possible Southwest plenty moisture instability Then over weekend Pacific moisture will increase across Precipitation placement type including snow levels amounts all somewhat uncertain given upper-level and surface flow model differences so continue monitor future forecasts details could change Some rain should overspread much central US Sunday could increase Monday as low strengthens Some northern central High Plains snow or rain snow mix cannot be ruled out backside low.

Temperature Outlook - Unseasonable Warmth East vs Cold West

Nation's Weather: ...Accumulating mountain snow in Cascades and Northern Rockies while unseasonable warmth dominates East... Highs in 70s forecast as far north as Mid-Mississippi and Ohio Valleys.

So pattern: West cool wet snowy East warm dry until cold front moves.

Safety and Travel Impact

Heavy rainfall and flash flooding threat expand Southern High Plains Southwest through Friday urban areas roads small streams narrow canyons gullies burn scars most vulnerable Avoid low-lying roads don't drive through flooded roads Turn around don't drown Road visibility can drop zero instantly during intense cells Be especially cautious night harder recognize flood dangers.

Mountain snow Cascades Northern Rockies Sierra Nevada: Slow down allow extra time prepare rapidly changing conditions including slippery roads bridges overpasses Ensure rental cars equipped all-weather tires or carry chains if crossing Cascades Check WSDOT real-time pass conditions traction chain requirements wsdot.wa.gov Check Caltrans Sierra Nevada snow levels 9000-10000 ft but periodic lowering 7000-9000 ft.

Heavy snow Sierra 60% chance at least 12 inches local maxima approaching 2 feet Additional heavy snow exceeding 6 inches likely greater than 60% higher elevations Sawtooth ID Uintas UT San Juans CO where locally 12+ possible All snow will likely be comprised less-than-climatological SLR leading substantial snow load impacts 20-50% chance at least moderate impacts due snow load WSSI-P means wet heavy snow can bring down tree limbs power outages.

Conclusion WPC Short Range Forecast

Valid Oct 29-31 2026 heavy rainfall flash flooding threat expand Southern High Plains Southwest through Friday Slight Risk Level 2 of 4 West Central Texas Thursday rain rates 1.5-2.5 inch per hour Marginal Risk southern New Mexico Slight Risk south-central Arizona Friday Saturday 2.5 inches Mogollon Rim 1 inch Southern California. Sierra Nevada heavy snow D2 D3 60% 12 inches local 2 ft Sawtooth Uintas San Juans 6+ inches local 12+. Cascades Northern Rockies snow 4-8 inches slick travel passes. Progressive cold front showers thunderstorms Mississippi Valley to Northeast through Friday. Extended Nov 1-4 trough brings widespread precipitation West Southwest heavy rain Colorado San Juans central Rockies possible East rain thunderstorms moderate heavy southern tier. Nov 5 East Coast slight risk heavy precipitation high winds Lower Great Lakes Ohio Valley Appalachians Northeast Mid-Atlantic. Nov 7-11 Pacific Northwest slight risk heavy precipitation heavy snow Cascades Klamath high winds coastal.

This article is 2500 words unique content for all over USA and some national reports too English text based on real WPC Short Range Public Discussion 203 PM EDT Oct 28 and 357 PM EDT Oct 29 2026, WPC Winter Weather Forecast Discussion 210 PM EDT Oct 29 and 150 PM EDT Oct 28, US Hazards Outlook CPC Oct 28 2026, WPC Extended Forecast Discussion 335 AM EDT Oct 28, Nation's Weather Paul Poteet. Different from previous thunderstorm coastal flood Halloween excessive rainfall freeze travel high wind El Nino tropical posts, this focuses on WPC short range forecast discussion and winter weather discussion which is most searched official forecast topic today.

FAQs

Q1. What is WPC Slight Risk?
Ans: WPC Excessive Rainfall Outlook Level 2 of 4 Slight Risk means scattered flash floods possible Level 1 Marginal isolated Level 3 Moderate numerous Level 4 High widespread Today Slight Risk West Central Texas Thursday south-central Arizona Friday-Saturday.

Q2. How much rain in Texas?
Ans: Several inches possible west-central Texas through Friday lesser amounts western Oklahoma Several inches possible 2-4 inches rain rates 1.5-2.5 inch per hour urban drainages low-lying areas sensitive terrain vulnerable.

Q3. How much snow in Sierra Nevada?
Ans: Higher elevations Sierra favored heaviest accumulation 60% chance at least 12 inches local maxima approaching 2 feet Additional heavy snow exceeding 6 inches likely greater than 60% higher elevations Sawtooth ID Uintas UT San Juans CO local 12+ possible Snow levels 9000-10000 ft periodic lowering 7000-9000 ft.

Q4. Will there be snow in Cascades?
Ans: Yes accumulating snow expected higher elevations Washington Oregon Cascades several inches wet snow slick travel mountain passes Snow levels around 3500 ft Washington Cascades 4500 ft central Oregon Cascades Additional snowfall modest pockets 50%+ probabilities 4 inches or more highest Olympics northern Cascades Northern Rockies vicinity Glacier NP.

Q5. What about East Coast?
Ans: Progressive cold front will bring showers thunderstorms Mississippi Valley to parts Northeast unseasonable warmth dominates East Highs 70s as far north Mid-Mississippi Ohio Valleys Rain with embedded thunderstorms Upper Great Lakes Lower Great Lakes through late Thursday night scattered light rain showers Northeast through Friday evening.

Q6. When does pattern change?
Ans: Upper trough pivot eastward into early next week become closed low central US by Tuesday carry surface low frontal system bring widespread rain central US again early next week Some northern central High Plains snow or rain snow mix cannot be ruled out backside low.

Stay safe check wpc.ncep.noaa.gov short range public discussion winter weather discussion excessive rainfall outlook.

Sources: wpc.ncep.noaa.gov Short Range Public Discussion, Winter Weather Forecast Discussion, Extended Forecast Discussion, US Hazards Outlook CPC, Paul Poteet Nation's Weather.

Valid: October 29, 2026 Short Range Forecast Discussion.