ATL: HANNA - Remnants - Discussion

[xironman]

Agreed that barring additional data the landfall intensity should be 75 kt.

I think the latest vdm was 75 kt, and they may have not sampled the strongest part of the storm:

L. Estimated (by SFMR or visually) Maximum Surface Wind Outbound: 75kts (86.3mph)

[1900hurricane]

Gonna guess recon finds an intensity of 75 kt/974 mb.

Too high by one millibar...

[chaser1]

I'd be curious to sample the N.E. eyewall in about 30/45 minutes. I'll tell you one thing, it's a good thing for S. Texas that Hannah didn't have another 6-12 hours over water.

[GCANE]

SPC just issued a new MD
Tornado Watch soon??




Mesoscale Discussion 1336
NWS Storm Prediction Center Norman OK
0118 PM CDT Sat Jul 25 2020

Areas affected...Texas coastal area

Concerning...Severe potential...Watch possible

Valid 251818Z - 252045Z

Probability of Watch Issuance...40 percent

SUMMARY...Threat for a few brief tornadoes is expected to undergo a
gradual increase this afternoon into the early evening. Convective
trends will continue to be monitored for a possible tornado watch.

DISCUSSION...As of early afternoon the center of Hurricane Hanna was
located just off the south Texas coast, moving slowly west. See the
latest discussions from the National Hurricane center for more
specifics on Hanna. North of the center, shallow convection
(including a few thunderstorms) within the outer rainbands are
moving inland from the western Gulf. Low-level hodograph size has
increased in corridor between Corpus Christi and Houston with 0-1 km
storm relative helicity from 300-500+ m2/s2, and modest updraft
rotation has been observed with a few of the discrete cells. The
warm core nature of the Hurricane and widespread clouds are
resulting in marginal instability. However, some cloud breaks are
evident between bands, especially along the central Texas coast, and
this might result in sufficient boundary layer destabilization to
support slightly more robust updrafts. As the center continues
westward and eventually moves inland, hodographs will remain
favorable for low-topped supercells capable of a few brief
tornadoes.

..Dial/Hart.. 07/25/2020

[toad strangler]

 http://twitter.com/philklotzbach/status/1287090992542371840

[Astromanía]

It's already raining strong in Monterrey due to Hanna I'm scared, it's gonna be a long days

[Highteeld]

 https://twitter.com/TheAstroNick/status/1287089915617054723

[Hybridstorm_November2001]

It's already raining strong in Monterrey due to Hanna I'm scared, it's gonna be a long days

Be careful, friend. A strengthening hurricane making landfall tends to be worse than a weakening one, in my experience.

[GCANE]

 https://twitter.com/NWSCorpus/status/1287092995167313921

[wx98]

The eye is now 5-7 miles from reaching the coast.

[South Texas Storms]

It's already raining strong in Monterrey due to Hanna I'm scared, it's gonna be a long days

Stay safe! I'm afraid its only going to get worse before it gets better.

[xironman]

Looks like one last pass through the NW quadrant, lets see if they get a 83kt wind.

[Highteeld]

Extrap pressure down to 970.5 mb now

[Highteeld]

Would like to see a pass out of the SE eyewall

[Steve]

We got a couple days of effects still, but low 970’s is kind of nuts. Everyone knows about the west gulf and crazy **** that happens with storms. Credit to Hanna for overperformance.

[Hypercane_Kyle]

...AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT AND DOPPLER RADARS FINDS HANNA HAS STRENGTHENED...
2:00 PM CDT Sat Jul 25
Location: 27.0°N 96.8°W
Moving: W at 8 mph
Min pressure: 973 mb
Max sustained: 85 mph

[tropicwatch]

Looks like the eye is possibly constricting some more.

[GCANE]

No doubt this bombed as it hit the coast.
I'll have to give GFS credit on this one even though it doesn't take a rocket scientist to know it would.

[Dave C]

No doubt this bombed as it hit the coast.
I'll have to give GFS credit on this one even though it doesn't take a rocket scientist to know it would.

It's making 1 more attempt at wrapping the eyewall around the north quadrant, Harlingen about to get hit hard!

[Hypercane_Kyle]

No doubt this bombed as it hit the coast.
I'll have to give GFS credit on this one even though it doesn't take a rocket scientist to know it would.

More credit to the HWRF on this one. Called this even when Hanna was a tropical depression while the GFS was showing a weak tropical storm.