Extreme Temperature Diary-September 11, 2018/ Topic: Tracking Florence Day Three

Tuesday September 11th… Dear Diary. The main purpose of this ongoing post will be to track United States extreme or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials)😊.  Here is today’s main climate change related topic:

Tracking Florence Day Three

Overnight Florence went through an eyewall replacement cycle. The good news in association with this is that Florence didn’t attain category five status. The bad news is that when a hurricane undergoes one of these cycles the wind field spreads out, so their is now a potential bigger threat for a greater area of the coast to see very high winds well in excess of 74 mph winds (hurricane threshold force). It’s certain now that Florence will make a North Carolina landfall coming very close to that states coast by Thursday evening.

What we still don’t know is whether or not the strength of Florence will be anywhere from CAT 2-5 at landfall. I think the most likely strength will be in the CAT 3-4 range. Florence may attain a historic CAT 5 strength later today well out to sea. Very subtle things like light wind shear and yet another eye wall replacement cycle may keep Florence from attaining CAT 5 status despite even higher sea surface temperatures ahead of the thing today through Thursday. It is also looking very likely that unlike Hugo from 1989 Florence will stall, unfortunately producing extreme, historic rainfall across a good chunk of real estate in the Carolinas and Virginia into the Appalachians. Both the Hurricane Center and the National Hurricane Center will be refining forecasts as we move forward towards an eventual landfall.

Here are some of today’s messages, which will be kept for posterity, in association with Florence. As I have been writing, I’m not going to second guess the National Hurricane Center, the best and most trusted source, unless guidance greatly deviates from their forecast. Usually if models go in a different direction NHC will make adjustments. I will snapshot model scenarios, but all reading this post should follow NHC as presented by The Weather Channel to get the best forecast.  I will group information in this fluid post under each six hour period in which model guidance is processed. The latest guidance will be at the beginning of the article with archived prior messages kept towards the end of Tuesday’s Diary. I’ll label each group with the time models are processed. So here we go:

(As usual, this will be a fluid post in which more information gets added during the day as it crosses my radar, crediting all who have put it on-line.)

Information coming in after the 00Z Wednesday models from 9/11/2018 were processed:

Oh mercy! The operational 00Z WED EURO bounces off the NC coast on Friday with the system moving southwest to before finally moving inland Sunday. Now my home state of is in play on this very weird looking model run. There are no words…

update: “Catastrophic” damage likely in Carolinas via

The right-wing media’s batshit crazy hurricane commentary has begun.
Rush Limbaugh on Hurricane Florence: “this is made to order for the climate change/global warming crowd … all to heighten the belief in climate change”


00 WED GFS operational run is trending slightly north with initial stab at the coast at near CAT 4 strength early Friday then retrogrades system southwest along coast much like that of the 18Z TUE model….another but plausible solution.

Information coming in after the 18Z Tuesday models from 9/11/2018 were processed:

Category 4 Florence Feeding on 30 Degree C Ocean Temperatures: via

Does global warming make tropical cyclones stronger? Accessible blog article by four leading scientists.

We have some new wrinkles in the forecast due to slower, meandering solutions from the 18Z run. Florence appears to be getting stronger as of this writing, so if it going to make a run at CAT 5 it will do it tonight. From the TUE afternoon NHC discussion:

“During the next 24 hours or so, Florence is expected to remain in a
very favorable environment consisting of low shear near 5 kt, an
expanding upper-level outflow pattern, and above-average SSTs of
29.0-29.5 deg C, which should result in additional strengthening.
By 48 h, the decreasing forward speed along with the large
inner-core wind field should induce some upwelling and gradual
weakening. Although the GFS- and ECMWF-based SHIPS intensity models
are indicating an increase in the southwesterly shear to near 20 kt,
this could be due to the SHIPS model capturing Florence’s own
strong outflow from the GFS and ECMWF model fields. Despite the
weakening shown at 72 hours, Florence is still expected to remain a
dangerous hurricane through landfall. After Florence moves inland,
the slow forward speed of less than 5 kt should cause a rapid spin
down and weakening of the hurricane’s circulation.”

Did a Facebook Live stream for the first time earlier today, with discussing  

UPDATE: holding at 140 mph, Cat 4. Still 2.5 days from likely landfall in SE NC. Projections now for 15-25″ of rain and isolated 35″ totals as storm stalls/meanders. More info:

Consider what it’ll be like if meanders near coast. Many hours to maybe DAYS of winds of tropical storm force or stronger, storm surge, and flooding rains will severely test one’s endurance, with power out lasting into the aftermath. More reason for plenty of supplies!

more like It is happening! It’s real
Get involved check ➡️

Barometric pressure readings have been kept in since 1871.  The lowest pressure ever measured here occurred in Hurricane Floyd back in 1999.  Could break this record?

More on Wilmington’s low pressure records at

Where will head after reaching the Carolina coast is still up in the air—but titanic rainfall amounts are in the cards

If anyone wants to read a more technical reason as to why there are differences between the EURO model and GFS please read through this Twitter thread:

Great thread.

Latest 8 pm Advisory: The current forecast cone from the National Hurricane Center takes into the Carolina coastline as a major overnight Thursday into Friday.

For those curious how NHC’s track forecasts have evolved for since it formed on August 31, here you go. This shows every 5-day forecast that has been made. The forecast tracks are colored by time; the black line/diamonds is the observed track so far.

The 18Z operational GFS has a lot of new wrinkles forecasting an initial brush with land near Wilmington Friday afternoon then a long stall near shore, finally totally moving inland by late Sunday…a horrific solution for the Carolinas due to .

Information coming in after the 12Z Tuesday models from 9/11/2018 were processed:


Insane Atlantic outlook graphic today. I’m afraid it is only going to get worse before it gets better! 😫

“Climate Change Supercharges Hurricane Florence as 1.5 Million Evacuate in Carolinas & Virginia” | My interview this morning with Amy Goodman on !:

A number of cities in the East have had one of their wettest years-to-date through Sep. 10, including Wilmington, NC, where it’s their wettest year-to-date in records dating to the 1870s. Almost 21 inches above average-to-date. And that’s before . (Map, data: )

remains a Category 4 storm on track to deliver major storm surge, destructive winds, and multiple days of potentially catastrophic rain/flooding after landfall. The latest from Dr. Jeff Masters:

A Hurricane Watch is in effect for Edisto Beach SC to the North Carolina-Virginia border including Albemarle and Pamlico Sounds. Hurricane conditions are possible within the watch area by late Thursday or Thursday night, with tropical storm conditions possible by Thursday morning

The operational 12Z TUE GFS, not surprisingly, has come in line with the EURO model with . A landfall late Thursday/early Friday near Wilmington is looking more likely as a CAT 3/4, then the system stalls in the Carolinas producing horrendous, historic flooding.

Information coming in after the 06Z Tuesday models from 9/11/2018 were processed:

has its sights set on the Carolinas, and if it hits as hard as predicted, the storm will be the most powerful to pound the area in three decades via

At 11 am Hurricane Florence is centered about 390 mi south of Bermuda or about 905 mi ESE of Cape Fear, NC. Florence has max winds of 130 mph and is moving to the WNW at 16 mph. Florence is forecast to slow down as it approaches the coast & stall inland over southern mid Atlantic

Wow! Watch this jaw dropping hurricane hunter video:

Only four hurricanes on record have made landfalls as Cat 4s north of Florida. may become the fifth–and could be the strongest landfall on record so far north

The operational 06Z TUE GFS is slower and stronger with than the 00Z TUE run. Most of the coast of North Carolina gets raked, then the system stalls in the Carolinas producing horrendous, historic rainfall if this model run is correct.

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The Climate Guy

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