Tropical Storm Edouard

[vortex95]

7 minutes ago, WxWatcher007 said:

2026 in a nutshell? Yeah. I'm not flying down.  

As hurting as the convection is, at least it is nicely circularly-banded and looks more like a classic TC.  Did not have that at all w/ Arthur, Bertha, Cristobal, or Dolly.  Shear was the big issue for those.  Edouard's issue is dry air, but you can do a bit better overall for max TC intensity when only dry air is an issue I have noticed empirically.

[WxWatcher007]

Tropical Storm Edouard Discussion Number   3
NWS National Hurricane Center Miami FL       AL052026
1000 PM CDT Mon Aug 31 2026
 
Satellite and radar data showed an increase in banding near the 
center of the small tropical cyclone during the late afternoon and 
early evening hours.  Subjective and objective satellite intensity 
estimates increased to around 35-40 kt, and the initial wind speed 
was therefore increased to 35 kt on the 0000 UTC intermediate 
advisory.  Since that time, there has been a pause in the 
organization of the system, but curved bands are noted over the 
northern and western portions of the circulation. An Air Force 
Reserve reconnaissance aircraft that has been sampling the system 
this evening reported earlier that the pressure has fallen to 
around 1004 mb, which is quite a bit lower than from this 
afternoon's mission, though the last fix was up a millibar or two.  
The flight-level winds do not appear to have responded to the 
pressure drop yet, so the initial intensity remains 35 kt for this 
advisory.
 
Edouard will be moving over very warm waters of the northwestern
Gulf within a low shear and a sufficiently moist environment
tonight and Tuesday morning.  As a result, nearly all of the
dynamical models indicate that the system will strengthen on its
approach to the coast, with most showing much of the strengthening
occuring in the final hours before landfall.  Given that the system
is small, a period of quick organization and strengthening seems
likely Tuesday morning.  The NHC forecast calls for intensification
during the next 12 hours and additional strengthening could result
in Edouard nearing hurricane strength when it approaches the
coast on Tuesday. Therefore, a Hurricane Watch and Storm Surge
Warning has been issued for a portion of the northwest Gulf coast
with this advisory. The NHC intensity forecast is near the upper-end
of the guidance envelope. Note that since the peak intensity is
expected to occur at landfall (between the 12 and 24 hour forecast
points), it is not possible to explicitly reflect Edouard's peak
intensity in the forecast points below.
 
Edouard is moving west-northwestward or 300/6 kt.  A low- to
mid-level ridge over the southeastern United States is expected to
steer the cyclone toward the west-northwest to northwest during the
next couple of days. This motion should bring the center onshore
along the northwestern Gulf Coast on Tuesday and inland over eastern
Texas Tuesday night.  The track guidance is in good agreement on
this scenario and the new NHC track forecast is essentially an
update of the previous track.
 
 
Key Messages:
 
1. Edouard is expected to strengthen and it could approach
hurricane strength before it reaches the northwest Gulf Coast on
Tuesday. Tropical Storm conditions are expected along the northwest
Gulf Coast with hurricane conditions possible from High Island to
Cameron.
 
2. A Storm Surge Warning has been issued from High Island, Texas to
the Vermilion/Cameron Parish Line, Louisiana where peak values of
3 to 5 feet above ground level are possible along the immediate
coast within the warning area.
 
3. Heavy rain will impact parts of the Upper Texas coast through 
east-central Texas into far Southwest Louisiana Tuesday and 
Wednesday as Tropical Storm Edouard tracks inland. Flash flooding is 
likely across this region, especially in urban areas. River flooding 
may also be possible.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  01/0300Z 28.6N  91.8W   35 KT  40 MPH
 12H  01/1200Z 29.2N  93.0W   50 KT  60 MPH
 24H  02/0000Z 30.1N  94.3W   40 KT  45 MPH...INLAND
 36H  02/1200Z 31.1N  95.4W   30 KT  35 MPH...INLAND
 48H  03/0000Z...DISSIPATED
 
$$
Forecaster Brown

[vortex95]

42 minutes ago, WxWatcher007 said:

Dry air definitely still looks to be an issue, and that was a clear limiting factor even when this was a lemon. I agree that there's no one size fits all for TCs, which is why the Twitter conversation sometimes gets frustrating because cold top convection does not automatically equal RI. You can see the dry air on the northern flank clearly, and it seems clear that it's having an impact, though I think the expanding outflow on the northern side of Edouard does limit it some. 

 

I've always been of the opinion that you need organization before substantial intensification so that's what I look for. Today we've seen substantial progress in that department. We went from a weak and elongated low this morning

To a much tighter wind field, with a meaningful pressure drop this evening on the first recon pass of the evening. 

I still think an overnight/morning convective burst aided by diurnal maximum given the developing inner core should allow for modest intensification, with an added boost from frictional convergence. Like someone else said earlier, I think this is one of those short fuse homebrew cases where we do say if this had more time it could have intensified more substantially. Regardless, it will be interesting to watch given the radar coverage we will have from now through landfall. Tonight I'll be watching to see 1) if the reduction in central convection leads to a collapse in the nascent inner core and if not 2) how soon we see the overnight convective burst I'm expecting. 18z HAFS has that happening around 5am. 

Some get *far* to impressed w/ large MCS areas w/ very cold cold tops for nascent TCs.  Yes it is intense convection, but that does not correlate well when it blows up very fast b/c that often mean it will dissipate just as fast.  And the collapsing convection hinders organization at low-levels, .It can also happen when a system of mdt TS status.  You get this immense area of very cold cloud tops, sometimes below -100 C, in a rather symmetric blob, calked a CCC, but there is no banding.  When this happens, the TC often is stunted in intensification until the CCC feature goes away.

If Edouard has a blow up of convection overnight, watch closely,  Does it form in a coherent band as we are seeing on the N side now, or is is just random blobs (zits!) expanding radially?  Also, you can have a combo of this.

Banding now on the N side is good, but nothing on the S side,  This implies dry air wrapping in.  Also, the banding on the N side may be due to frictional convergence from the LA coast.  Still, that can increase max winds b/c the stronger convection mixed down higher winds aloft better and the band is pushing against weak high pressure to the NE