Friday Night, October 9, 2026
Foothills Weather Network
Valid Saturday, October 10, through Monday, October 12

Good Friday evening, everyone.

We have spent much of the past several days tracking Isaias and evaluating how this system will affect western North Carolina. As we move into Friday night, the forecast has become considerably clearer, and there are some important changes that we need to discuss before the rain and wind arrive.

Our overall forecast continues to favor the greatest impacts along the Blue Ridge Mountains and the eastern escarpment, but the concern for excessive rainfall and localized flash flooding has increased. This is especially true from Polk and Rutherford Counties northward through McDowell, Burke, and Caldwell Counties, where the terrain will play a significant role in enhancing rainfall.

The National Weather Service has now issued a Flash Flood Watch for portions of western North Carolina from 8 AM Saturday through 2 PM Sunday. High Wind Warnings and Wind Advisories have also been issued for portions of the mountains.

These developments are consistent with what we have been seeing in the latest computer model guidance. Rainfall amounts have continued trending upward, and some of the higher-resolution guidance is now producing rather impressive totals along portions of the eastern slopes.

Before getting into those details, I want to emphasize something important. We are not forecasting another Helene across western North Carolina. The atmospheric setup, expected storm evolution, and overall scale of impacts are different. However, that does not mean we should dismiss the potential for localized significant flooding, especially in our mountain communities where streams, drainage systems, and slopes remain vulnerable following the changes caused by Helene two years ago.

Isaias became a major Category 3 hurricane earlier today, reaching maximum sustained winds of 120 mph over the Gulf of Mexico. By late Friday afternoon, maximum sustained winds were near 115 mph as increasing upper-level wind shear began affecting the hurricane’s structure.

The hurricane has made landfall the western Florida Panhandle and will now move inland tonight before accelerating northward through Alabama on Saturday. The circulation will weaken as it moves inland, eventually turning northeastward toward Tennessee and the central Appalachians Sunday.

The center of Isaias is not expected to pass directly over the western North Carolina foothills. However, as we have discussed in previous briefings, the location of the center does not necessarily determine where the heaviest rainfall occurs.

In this case, some of the most persistent rainfall may develop well east and northeast of the weakening circulation, where deep tropical moisture interacts with high pressure positioned north of the Carolinas and the eastern slopes of the Blue Ridge.

That interaction is becoming the primary focus of our forecast.

As we move through tonight, clouds will continue thickening across the region while moisture increases from the south. Rain should begin developing across northeast Georgia and the western Carolinas overnight, reaching portions of our southern foothills and mountain communities before daybreak Saturday.

By Saturday morning, widespread rainfall should be developing across much of our coverage area, with rain becoming increasingly persistent as we move through the day.

Saturday is shaping up to be a very wet day across western North Carolina, and I would not expect many meaningful breaks in the rainfall, especially near the mountains.

The heaviest and most persistent rainfall is expected Saturday afternoon through Saturday night, with additional heavy rainfall possible into Sunday morning.

What concerns us most is the potential for rainfall to repeatedly develop and move across the same locations along the eastern slopes of the mountains.

We have a rather favorable atmospheric setup for this to occur.

High pressure to our north will maintain a relatively cool and stable air mass along the eastern side of the Appalachians. Meteorologists refer to this as cold-air damming, but it is essentially a shallow layer of cooler air that becomes trapped against the mountains.

Meanwhile, strong southeasterly winds above the surface will transport very moist air from the Atlantic into western North Carolina.

As this warmer, moisture-rich air encounters the cooler air near the ground, it is forced upward. That process produces widespread precipitation, even without thunderstorms.

Now add the Blue Ridge Mountains to that equation.

The same southeasterly flow carrying moisture into our region will be forced upward again as it encounters the eastern slopes. This additional lifting enhances rainfall production and can maintain heavier precipitation over the same terrain for several hours.

There is also an additional contribution from the upper-level circulation associated with Isaias. As the system moves northward, the atmospheric pattern will support rising motion across Georgia and the Carolinas, helping sustain rainfall even as the original tropical circulation begins weakening.

It is the combination of these processes that has caused rainfall forecasts to increase.

Our latest guidance continues to suggest that widespread rainfall amounts of 2 to 4 inches are becoming increasingly likely across much of the foothills, with 3 to 6 inches possible along portions of the Blue Ridge and eastern escarpment.

Some locations may receive more.

We are particularly concerned about the higher terrain extending from Saluda and Tryon northward through Lake Lure, Chimney Rock, Old Fort, the upper Catawba River watershed, Jonas Ridge, and portions of the Wilson Creek drainage.

These locations are positioned favorably for persistent upslope rainfall, and several of our higher-resolution computer models have begun highlighting the potential for substantially greater accumulations in narrow corridors.

One of the more aggressive model solutions is producing rainfall totals approaching or exceeding 10 inches across isolated portions of the eastern Blue Ridge, with even higher localized amounts depicted.

I want to be careful with how we communicate those numbers.

We are not forecasting 10 to 15 inches of rain across the entire mountain region. Those are localized values from individual model simulations, and we should not treat them as a widespread expectation.

However, when high-resolution guidance begins repeatedly identifying narrow corridors of extreme rainfall in areas where the terrain strongly favors precipitation enhancement, we cannot simply ignore those signals.

The placement and intensity of these rainfall maxima remain uncertain. A relatively small change in the direction of the low-level winds or the placement of the heaviest precipitation band could shift the greatest rainfall totals from one drainage basin to another.

That is why our greatest concern is not necessarily the rainfall total forecast for a particular town, but what may occur in the higher terrain upstream from that community.

For example, Marion may receive considerably less rainfall than the mountains north and west of town. However, heavy rainfall in the upper Catawba River watershed and its tributaries can still influence downstream water levels.

The same principle applies to communities along the Broad River, Green River, Wilson Creek, Johns River, and other mountain waterways.

The amount of rainfall that falls upstream is often just as important as the amount that falls where you live.

This is particularly relevant for the communities of Old Fort, Lake Lure, Chimney Rock, Saluda, and portions of northern McDowell, Burke, and Caldwell Counties.

We have also been evaluating the lower foothills and northwest Piedmont, where the rainfall forecast is generally less aggressive.

Communities such as Morganton, Lenoir, Hickory, Newton, Taylorsville, Lincolnton, Shelby, and much of the lower elevations of Cleveland and Catawba Counties should experience a prolonged period of rain, but the potential for the highest rainfall totals decreases as we move farther east away from the mountains.

That does not eliminate the possibility of localized flooding. Poor-drainage areas, urban locations, and small streams can still experience problems if heavier rainfall bands persist.

The greatest concern remains closer to the mountains, where the combination of terrain and persistent moisture transport may produce considerably greater accumulations.

One encouraging factor is that much of the region has experienced relatively dry weather over the past week. That has allowed streamflows to remain lower than they otherwise might be entering an event like this.

However, lower initial streamflows do not prevent flash flooding when several inches of rain fall over a short period.

Once the ground becomes saturated and runoff increases, smaller mountain streams can respond very quickly.

Another concern involves the stability of steep slopes. Rainfall amounts approaching 5 to 6 inches or more can begin increasing the potential for isolated landslides, particularly where soils become saturated or where slopes have already been weakened.

Given the extensive landscape changes following Helene, we will be watching those areas very closely.

The wind forecast also deserves attention.

As Isaias moves northward through Alabama and high pressure remains positioned north of the Carolinas, the pressure difference between these systems will strengthen the winds across the southern Appalachians.

The strongest winds are expected across the higher elevations, particularly above 3,500 feet, where gusts of 55 to 60 mph may occur.

These winds could become strong enough to bring down trees and limbs, especially in exposed locations.

Wind Advisories have also been issued for portions of the lower mountain elevations and along the eastern escarpment, where gusts may reach 35 to 45 mph in some locations.

The combination of wet ground and gusty winds increases the potential for isolated power outages.

We do not expect every community across the foothills to experience damaging winds. In fact, the cool, stable air near the surface may limit the transfer of stronger winds aloft to ground level in many of our lower elevations.

However, exposed ridges, mountain gaps, and locations where terrain accelerates the wind could experience substantially stronger gusts than nearby sheltered valleys.

The greatest wind concern will develop overnight tonight across the higher mountains, expand Saturday, and continue into early Sunday.

We will also need to monitor the possibility of isolated severe thunderstorms and a brief tornado threat late Saturday night into Sunday.

At this time, the tornado concern remains considerably lower than the rainfall threat across most of our immediate coverage area.

The main limiting factor is the cool, stable air expected to remain in place along the eastern side of the mountains.

That stable air should make it difficult for thunderstorms to become rooted near the ground, even though the atmosphere will contain substantial wind shear.

However, if the cool air begins retreating Sunday morning and warmer, more unstable air moves into portions of the foothills or northwest Piedmont, a few thunderstorms could become capable of producing damaging winds or brief rotation.

The better opportunity for that development currently appears farther south and east of our primary mountain and foothills coverage area.

We will continue monitoring the position of the retreating wedge boundary because even a relatively small northward or westward shift could change where the isolated severe weather threat develops.

The most important timeframe for western North Carolina continues to be Saturday afternoon through Sunday morning.

During that period, rainfall will become increasingly widespread, winds will strengthen, and the potential for localized flash flooding will reach its highest level.

By Sunday afternoon, we expect the more persistent rainfall to begin moving away from the region as the remnants of Isaias accelerate northeastward.

Conditions should gradually improve across the foothills, although some lingering showers and gusty winds may continue in the mountains.

Northwest winds may remain gusty across the higher elevations Sunday night into Monday as drier air returns.

By Monday, much of the foothills should experience improving weather, with generally dry conditions returning for much of next week.

Looking at the overall situation tonight, our confidence is high that western North Carolina will experience a widespread rainfall event this weekend.

Our confidence is also increasing that the eastern Blue Ridge Escarpment will experience the greatest impacts.

What remains uncertain is exactly where the narrow corridors of heaviest rainfall will become established and how much rain those locations ultimately receive.

For most of the lower foothills and northwest Piedmont, this may still end up being a beneficial rainfall event with relatively limited impacts.

For portions of the mountains and eastern escarpment, however, we are now dealing with a more meaningful flooding threat that deserves attention.

I would strongly discourage camping near mountain streams, hiking in remote drainage areas, or traveling along roads that are particularly vulnerable to flooding Saturday night into Sunday morning.

If you live near a creek or stream that responds quickly to heavy rainfall, pay close attention to conditions upstream and make sure you have a reliable way to receive weather warnings overnight.

Please do not attempt to drive through flooded roads. Water flowing across a roadway can be much deeper and stronger than it appears, and mountain roads can experience erosion or damage that is not immediately visible.

We will be monitoring radar trends, rainfall rates, stream responses, and the latest high-resolution guidance throughout the weekend.

Our primary concern remains focused on the eastern slopes of the Blue Ridge, particularly from Polk and Rutherford Counties northward through McDowell, Burke, and Caldwell Counties.

The next 24 to 36 hours will be important as we see exactly how the moisture transport and terrain enhancement develop.

We will continue updating our forecast as conditions evolve, and if the higher-end rainfall scenarios begin looking more likely, we will communicate that clearly.

For now, prepare for a very wet Saturday, periods of strong winds in the mountains, and the possibility of localized significant flooding along the eastern Blue Ridge.

Stay weather aware this weekend, especially if you live or travel near the mountains.

Foothills Weather Network
With you before, during, and after the storm!