Matt Lanza

Thanksgiving week weather outlook features mostly minor headaches in spots

One-sentence summary

Thanksgiving week travel looks a little sloppy in spots at times, but we can hopefully avoid any massive travel disruptions this year, at least due to weather.

Thanksgiving week outlook

It’s never easy, right? Travel anytime of year is a crapshoot to be sure, but of course during probably the busiest travel week of the year, we punctuate our mostly benign autumn with a fairly big storm. Different days this week will have different hazards in different parts of the country. As of now, it doesn’t look like we’ll see anything severely disruptive, but there are a couple things to point out.

Today: Severe weather risk in the Deep South

The main story for the Monday phase of this storm will be severe weather risk for the Southern US. Louisiana and Mississippi seem to be the prime spots at risk today for strong winds, hail, and possible tornadoes.

As of Monday morning, an enhanced (level 3/5) risk for severe storms was in place between extreme east Texas, across northern Louisiana and into parts of southwest Mississippi (NOAA SPC)

The tornado threat is not a guarantee, but if storms can maintain themselves individually in Louisiana or extreme eastern Texas (before “lining out” into bands of t’storms), a strong tornado or two will be possible. Either way, reports of hail and strong, damaging winds are possible, if not likely with storms today that should get going through the afternoon hours. The severe risk will push into Mississippi later this afternoon and evening and into Alabama and parts of the Florida Panhandle perhaps by the overnight hours, with a continued severe risk. Some adjustment of the above risk is possible before the end of the day today. If you’re traveling in this region today or tonight, please ensure you have the ability to receive weather warnings.

Tomorrow: Rain & wind in the Northeast and Midwest

The storm itself will track from about the Red River Valley into southern Michigan or near Lake Erie between today and tomorrow. This means that on Tuesday, we’ll begin to see widespread rain, thunderstorms, and gusty winds in the Eastern U.S. Gusty winds will likely delay some flights to and from places like Chicago, Detroit, Cleveland, or Pittsburgh.

Gusty winds will be strongest in Appalachia, as well as into parts of the Midwest, where gusts of 30 to 40 mph will be possible through Tuesday. (Weather Bell)

Rain may begin as a wintry mix for parts of the interior Northeast as well. Overall, this won’t be a massive storm up that way, but it will be enough to cause disruption.

The primary severe weather risk tomorrow will be with the continuation of storms overnight into the morning hours moving across Alabama and the Florida Panhandle.

Wednesday: Improving, except in the Northeast

Boston and New York may still see some gusty winds on the backside of the storm Wednesday as it exits in the morning.

Some fairly strong wind gusts on Wednesday may impact flights into Boston, southern New England, or the NYC metro airports. (Weather Bell)

Gradually improving weather is expected during the PM hours, but some of those wind gusts in the front half of the day may cause some travel headaches.

Elsewhere, there’s at least a subtle severe risk in eastern North Carolina before the front exits, but that’s not expected to be a big deal.

Thanksgiving Day: Showery Gulf Coast, snowy Wyoming?

Travel overall looks fine on Thanksgiving Day if you’ll be hitting the road. The two exceptions to this are on the Texas Gulf Coast and in Wyoming.

For Texas, showers are possible between about Laredo and Matagorda Bay south through Corpus Christi and the Valley. This won’t disrupt travel much, but it could put a slight damper on any outdoor Thanksgiving plans.

Potential snow from the National Blend of Models, most of which falls Thursday in Wyoming. This is subject to change, but some travel disruption is possible in this region into southern Montana. (Pivotal Weather)

The situation in Wyoming and southern Montana is a little trickier, as is always the case with snow forecasting more than a day or two out. A storm seems likely to deliver some wintry weather to the region on Thanksgiving Day, but exact amounts are TBD. Whatever specifically happens, if your travels take you to Yellowstone or portions of northern Wyoming and southern Montana, you will want to be prepared for some travel difficulties.

Friday: Storms in the Southeast, snow into Colorado?

The aforementioned winter storm in Wyoming on Thursday will probably slide into Colorado on Friday bringing a chance of winter weather there that could cause some travel issues.

A moderate risk for travel issues across Colorado exists on Friday as a winter storm slides in. Details and specifics will be sorted out in a few days. (NWS Boulder)

Travel impacts are currently expected to be on the moderate side across Colorado, so if you are traveling from Denver to go skiing or visit the mountains on Black Friday, you will want to be ready to deal with some weather.

Elsewhere, the showery system in Texas on Thursday will move across the Gulf Friday, bringing a chance of showers and storms to the Southeast, particularly Florida. The rest of the country looks pretty good.

This weekend: Some uncertainty

The weekend looks ok at this point, with the Colorado system diving into the southern Plains bringing a chance of showers. Additional showers are possible on the East Coast later Saturday and Sunday, but as of now nothing looks too serious. We’ll keep tabs on things.

November 17, 2023 Outlook: Last call for the tropical Atlantic and a sneak peek at Thanksgiving travel weather

One-sentence summary

Potential Tropical Cyclone 22 has a narrow window to develop before tomorrow when it slams shut in the Atlantic, and today’s post covers Wednesday travel weather which looks good with a couple big exceptions.

Potential Tropical Cyclone 22

We were expecting that Potential Tropical Cyclone 22 would become Vince later today as it races northeast across Jamaica, Cuba, and the Bahamas.

How to describe PTC 22? Quick and lower-end on the intensity scale. The main concern will be heavy rain as it races off northeast into the open Atlantic. (NOAA NHC)

But a look at satellite this morning suggests that 22 is still far from organized. The window for organization will remain open a bit longer before it slams shut, and 22 or Vince or whatever merges in with a non-tropical system in the open Atlantic, as it passes Bermuda.

PTC 22 lacks much organization whatsoever this morning, and it seems like getting to a true tropical storm will be an uphill battle. (Weathernerds.org)

So if PTC 22 were to become a tropical storm as it passes Jamaica, Cuba, and/or the Bahamas and Turks & Caicos Islands, how strong could it get? Not very. The ceiling on 22 is limited, probably to a minimal tropical storm. That said, it is going to bring a good deal of rainfall to the islands as it passes by, and as much as 8 additional inches could fall for portions of Jamaica or a bit more in southeast Cuba. As much as 4 to 8 inches or so will be possible in southern Haiti.

Rainfall from PTC 22 will be about 8 more inches in Jamaica, up to a foot or so in SE Cuba, and perhaps 8 inches or more in southern Haiti. (NOAA WPC)

So flooding is the primary concern with 22 as it trucks through the Caribbean and into the Atlantic today and tomorrow. With that, we suspect that the 2023 Atlantic hurricane season will come to an unofficial close.

Thanksgiving Wednesday travel outlook

With a lot of people hitting the road next week for the Thanksgiving holiday here in the U.S., we thought it might be helpful to give you an initial read on what travel conditions may look like for Wednesday.

The forecast map for Wednesday shows a stormy Northeast US and southeast Canada, a quiet central and western US, and some scattered storms in Florida. (NOAA WPC)

So, right off the bat, travel in the West looks fine right now. No issues are expected Wednesday. The Central U.S. looks quiet as well. A cold front will deliver scattered thunderstorms to Florida, this after some potential severe weather on Tuesday in the South. But overall, other than some minor issues, the expectation is that any travel to or from Florida will be fine.

The trouble spot on Wednesday looks to be the Northeast, Great Lakes, and Canada, where a potent storm will bring a bunch of issues for Wednesday. Chief among those issues will be wind, which is likely to cause delays at Northeast hubs like Boston, the NYC metro airports, and perhaps Philly and DC. Conditions should gradually improve later in the day Wednesday it appears, but there may be cascading delays due to airline issues there. I would also watch Chicago for potential issues with wind, which can always impact the air travel system. Aside from wind, some heavy snow is likely in parts of Quebec and interior Ontario, and some lake effect snow is likely in the snow belts of Michigan and perhaps off Lakes Erie & Ontario as well.

So if your travel plans take you north and east of about Indiana, you’ll likely want to have a little extra patience this year.

November 14, 2023 Outlook: South Florida flooding risks increase on Wednesday, while a separate Caribbean system makes a brief attempt to develop

One-sentence summary

Two separate systems are on the board, with one (non-tropical system) bringing heavy rain to Florida tomorrow and then heading off to the north, while another disturbance in the Caribbean has a chance to form before racing past Jamaica, Cuba, and Hispaniola later this week or weekend.

Florida flooding: Metro South Florida at risk for considerable flash flooding on Wednesday

Just a quick update this evening on what’s happening in the world of weather, and we’ll start in Florida. Areas just north of Miami have seen some heavy rainfall today, with two bullseyes of 4 inches or more, the first near Davie and the other around Pompano Beach, where over 5 inches has fallen.

Click to enlarge for impressive rain totals today north of Miami and west of Fort Lauderdale. (NOAA/RadarScope)

As showers diminish tonight, a quiet period will unfold before another, more widespread round of rain and storms tomorrow. This one will be capable of significant rain totals in excess of 4 to 6 inches to as much as 8 inches or even more tomorrow for parts of coastal, urban South Florida. Because of this, the NWS Weather Prediction Center has Miami-Dade, Broward, and portions of Palm Beach County under a moderate risk (level 3 of 4) for excessive rainfall and flooding risk on Wednesday.

A moderate risk (level 3 of 4) is posted for southeast Florida on Wednesday, as repeated rounds of heavy rainfall are possible, leading to more significant urban flooding. (NOAA)

Intriguingly (and somewhat confusingly), all of this may congeal into an area of low pressure off Florida’s east coast that has a low (albeit not zero) chance of developing into a tropical system as it races north and east. This is *not* the same system we’re watching in the Caribbean, but this one may produce a nor’easter type impact in eastern New England or Atlantic Canada by the weekend, including a chance of heavy snow on the back side of the storm for portions of Quebec, New Brunswick, or northern Maine.

Heavy snow is possible in portions of northern Maine and eastern Canada on the backside of this developing storm near Florida, as it comes north this weekend. (NOAA)

Tropical Update: Caribbean development remains possible later this week

Meanwhile, we continue to see at least the chance that a late season tropical system will form later this week in the Caribbean. The good news is that both the GFS and European model have tended to reduce the odds of anything significant developing.

Disorganized thunderstorms in the southwest Caribbean may develop into an organized system before it races north and northeast out to sea by the weekend. (Weathernerds.org)

So what was already a low chance of a significant storm is now quite low. Certainly heavy rain is possible, if not likely across the Caribbean, but getting this thing to depression status or even TS Vince, will take some effort. Can it get there? Sure, but I’m not sure it’s the most likely outcome. Regardless, interests in the central and western Caribbean should continue to monitor this thing until it passes.

November 13, 2023 Outlook: Late season tropical system possible in the Caribbean, and we check in on — Alaska?

One-sentence summary

Today’s post talks about the potential for a late season tropical system in the Caribbean this week, as well as a detailed look at polar opposite weather that’s causing trouble in Alaska lately.

Tropical update: Caribbean mischief may present itself this week

We’ve got ourselves a late season system to possibly monitor in the southwest Caribbean later this week.

The Southwest Caribbean is highlighted with 60 percent odds of development this week by the National Hurricane Center. (Tomer Burg)

Model guidance is pretty persistent in developing low pressure off the coast of Nicaragua or Costa Rica around Wednesday or Thursday. It would quickly move northeast or north-northeast toward Jamaica, eastern Cuba, or Hispaniola from there, before accelerating out into the open Atlantic, perhaps impacting Bermuda on the way out this weekend. This will all occur quickly.

The GFS (left) and Euro (right) offer two differing outcomes but the same broad idea for the potential track of low pressure out of the Caribbean. (Tropical Tidbits)

As is often the case this time of year, the GFS model is much more aggressive with this system than the European model. The GFS has the equivalent of a strong tropical storm or low-end hurricane racing northeast of Jamaica on Saturday, whereas the Euro is a bit slower and notably weaker. The Euro has had a slightly better track record in the Caribbean, but it’s still a good idea for eastern Cuba, Jamaica, Haiti, and the Dominican Republic to monitor this potential system in the coming 2 to 3 days. From there, the Bahamas, Turks & Caicos, and Bermuda should also keep tabs on things. Whatever happens will happen fast, as this thing is going to be hauling north-northeast, tracking from the deep southwest Caribbean on Wednesday or Thursday to past Bermuda by Sunday or Monday.

U.S. Weather this week: Stormy Gulf, wet West Coast

A storm system on the Gulf Coast over the next couple days will bring some moderate to heavy precipitation between Texas and Florida, with anywhere from 2 to 5 inches likely. The highest totals are likely near Mobile, AL and Pensacola, FL. Flooding isn’t expected to be a huge concern, as the entire region is in pretty serious drought, and if anything, this will be a mostly beneficial rainfall.

This week’s rainfall will be mostly minor, except on the Gulf Coast and in coastal California and the Cascades. (Pivotal Weather)

The West will see a few surges of moisture this week thanks to a storm sitting offshore of California. This is expected to bring moderate to locally heavy rain to coastal California and some snow in the Sierra.

Rain totals have come off some versus a few days ago in California, but a wet period is expected this week. (NWS Monterey/SF Bay Area)

Overall, this should be more of a periodic ramp up/ramp down type precipitation event for California, but the rain (and snow) will add up over time. About 1 to 3 inches of rain is possible on the coast, including both San Francisco and LA, with locally higher amounts in the mountains and perhaps a little less in San Diego. Flooding isn’t a major concern at this point, particularly as the forecast has trended a little less excited about things.

Flaked Alaska: Heavy snow causes familiar problems in Anchorage

We don’t often talk about Alaska for weather unless it’s due to the pattern up there impacting the pattern for the weather across the U.S. But it’s worth talking about what’s happened in parts of Alaska to start November.

Precipitation to start the month in Alaska has been extremely heavy, with over 200% of normal for the period in southern Alaska, including the Anchorage area. (Brian Brettschneider)

Anchorage, the largest city in Alaska, with a population near 300,000 has received nearly 30 inches of snow this month so far, most of it courtesy of an atmospheric river event last week. This is the snowiest start to November on record in Anchorage. I reached out to the authority on all things Alaska weather, Brian Brettschneider, and I asked him to put into context how this sort of big time snow fits the typical climatology for Anchorage.

First, he tells me that the median snow depth for Anchorage around this time of year is about an inch or two. The snow depth there is around 2 feet, which only happens in maybe half of all winters at all there. “This snow will not fully melt out until April,” he says.

On top of that, this was a wet snow for Anchorage. What do we mean when we say “wet snow?” A number of factors play into what we call the “snow ratio,” or how much snow you would melt to get 1 inch of water. In general, colder and drier air masses produce higher snow ratios. It takes more snow to get that 1 inch of liquid. You see this a lot with lake effect snow. One inch of liquid may produce anywhere from 20 to 30 inches of dry, fluffy snow.

Warmer, more humid air masses tend to produce lower snow ratios, or situations where it does not take as much snow to produce an inch of liquid. A general rule of thumb, particularly on the East Coast, is that 10 inches of snow usually melts down to 1 inch of liquid. So the ratio is 10:1 (ten to one). In Anchorage, a colder and typically drier place, Brettschneider says that the average ratio is 17:1 typically. With this recent event, the snow ratio was 11:1. I wouldn’t call that “cement,” but that’s a very wet snow for Anchorage. Wet snow tends to be harder to move and clear, it can bring down trees and power lines, and it also causes significant issues on roadways as it will produce slush that can freeze into solid ice. This is one problem in Anchorage right now.

And it’s not a new problem either. Brettschneider said that it’s important to understand the current context of the situation in Anchorage. “Three rapid succession storms last December caused a month-long road-pocalypse around town. The state/city made it a priority to not let that happen again – yet here we are.”

Last December, Alaska Public Media asked “Should snow in Anchorage be this disruptive?” In a follow up article last month, APM reported that Anchorage said it was prepared should a storm like last December’s happen again. Anchorage mayor Dave Bronson said at his October news conference, “We are ready.”

The residents of Anchorage can decide if that’s the case. The second major multi-day snowstorm in Anchorage in less than a year is surely impressive. It’s also worth noting that despite the snow, it has not been cold in Anchorage, at least not compared to normal. “So far this month, the first 11 days are all warmer than normal in Anchorage – much warmer than normal,” per Brettschneider. It typically takes someone milder weather to produce this kind of snow in Alaska, as warmer air can hold more moisture.

On a serious note, the AP reports that four unhoused people died during the winter storm in Anchorage last week.

More snow is coming to Alaska today, including Anchorage.

The forecast through Tuesday afternoon in the Anchorage area calls for about another 6 inches of snow. (NWS)

As much as another half-foot or even a bit more of snow is possible in the Anchorage area today, with higher amounts in the Chugach Mountains east of the city. More snow is possible later this week.