As of Sunday evening, it's looking more likely that the Carolinas won't have to worry about #Ian slipping back into the Atlantic for more East Coast mischief.
That doesn't mean portions of the Carolinas will escape unscathed, however. Why? Let's take a look ... 🧵1/x
This evening, the models are still uncertain about just where in Florida or just when #Ian will land. The further up the west coast it goes, the later the arrival. But once there, it looks like the storm will remain inland. 2/x
There are some outliers among the models that still steer a weakened Ian back into the Atlantic. Given the projected steering as the storm reaches Florida, I don't see it. If #Ian reaches NC, it's likely taking an inland route. 3/x
As long-time #Weatherhounds know, however, that doesn't mean we won't potentially get smacked in the Sandhills. In fact, some modeling dumps as much or more more rain in North Carolina than along #Ian's path in Georgia. 4/x
Hmmm: Let's try that again ... the CMC, GFS and NWS models for rain from Ian. 5/x
The reason isn't the storm itself but the moisture it's dragging along. As Ian slides north it's pinwheeling a river of moisture up from the tropics into the Carolinas. You can see the tail of tropical moisture streaming into the Sandhills here as PWATs top 2.2 inches. 6/x
To the north, a decent ridge is projected to move overhead. This would "cap" the moisture, super-saturating the air. When air can't hold any more water .... rain, possibly heavy. Watch the moisture "tail" draw more showers into the Carolinas on the CMC model. 7/x
We were going to see showers anyway, but this setup could produce some problematic soakers. I'll let the NWS address that when the time comes. For now, just be aware of the potential -- even with Ian down in Florida. 8/x
The timing of all this is uncertain, but the best guess is scattered showers after lunch Friday. Heavier rain in the Sandhills would likely begin Friday night into Saturday, tapering off in the late afternoon. If Ian dallies, Sunday morning rain is possible. 9/x
Winds could be surprisingly gusty as well. The Sandhills could see gusts up to 50 mph in the southern region Friday afternoon/evening. I have a feeling we're going to see some prep football reshuffling. 10/x
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A couple of notes from the NHC's 11 a.m. update: 1. The track, as expected, has shifted slightly to the east. Much of the Big Bend area, which was Ground Zero 2 days ago, are entirely out of the cone now. Relief for the folks hammered by Michael.
Also the center of the NHC cone is just south of Tampa Bay. That would be huge for the metro area. If the bay can stay to the north of Ian's center of circulation, water will be pushed out, rather than into, the bay.
3. In addition to flirting with the Atlantic the NHC is keeping Ian stronger longer. It now projects a tropical storm all the way through Statesboro, GA toward Augusta. That's a good 12 hours longer than previous expectations. More wind, possible more rain into the Carolinas.
There's a quite a bit to unpack with #Ian this morning, and a lot of solid folks are dealing with its approach to FLA. As you know, my focus is on the Carolinas, so let's start there. 1/x
If you think the official NHC map looks a little different this morning, you're correct. Overnight, the NHC tweaked it a bit to the south and east, which puts the Sandhills more squarely in the 5-day Cone of Uncertainty. 2/x
Another thing to note is that Ian continued to grow up overnight. When the sun rises, we should have some impressive photos of a Cat 3 storm leaving Cuba. As you can see, Ian is pulling moisture from deep in the Caribbean, and already hitting south Florida. 3/x
#Ian made the jump to hurricane overnight ... looks pretty healthy this morning, too. Modeling is locking in on landfall north of Tampa into the Big Bend area. There are a couple of interesting outliers, however.
The most intriguing outlier, as far as interests in the Carolinas go, is the ICON. It still develops Ian into a near Cat 4 storm just before landing south of Tampa. Rather than sliding north That's 36 hours over FLA. 1/x
From there, it pokes around the Atlantic a couple of days, holding together for a third landfall (if you include Cuba) between Beaufort and Edisto in SC as a decent Cat 1 storm.
91L is up to an 80 percent chance of developing this week, per the NHC. Once it does, it will be named Danielle -- and we'll have a better idea who the storm would eventually threaten -- if anyone. 1/x
This morning, modeling seems to indicate a slw strengthening, then a recurve somewhere north of the Bahamas. Obviously that's good news for the Carolinas -- especially after last night's GFS run. 2/x
That said, there are 3 things that need to happen before we can put confidence in not having Danielle threaten. 1. Consolidation 2. Strength 3. Synoptics
Let's take each in order: 4/x
All eyes (well, except for those following the GFS phantom doomsday storm in the Gulf) are on #91L this weekend. But down the road, that little yellow dot to its north may have a lot to say about things. Why? 1/x
The little dot (let's call it a lemon) will never be a threat, and likely won't even make tropical depression status. It's trying to develop in a region of dry air and shear -- sort of like FAMU vs. UNC or Duquesne vs. FSU last night, the odds are stacked against it. 2/x
Current moisture levels in that area are similar to what we see in October: PWATs below 1.25 inches and humidity that would feel refreshing to us -- but not to a system trying to develop. 3/x
Treyce with an interesting observation on the 12Z Euro. Timing is essential when these systems are trying to make it across the Atlantic. Often gaps between highs open, allowing the storm to sniff a path to the north. 1/x
As the Euro runs unfold, note the increased forward speed and the latitude in each run in relation to the high pressure influencing its track. As Euro shift the high from the Carolinas to New York, it allows the storm to slide north of Hispaniola. 2/x
Placement of the high is as important as strength. In the 0Z run, the high is weaker, but sitting over the southern Apps, and the storm steers to the west (left). 12Z run has a stronger high 1029 vs. 1023, but well to the north. Less resistance for the storm as it moves north.