Atlantic - Sally forms September 12, 2020 (tornado, city, inches, moving)

[Cambium]

https://twitter.com/WxRobBradley/sta...463949312?s=19

[Psychoma]

Sun 13Sept 5pEDT/4pCDT:
Basically storm spent the day slowly trying to organize itself fighting a little wind shear so nothing really changed. Pressure holding, winds holding. That shear should relax tonight and through Monday so should start seeing intensification starting tonight.

Reminder affects will be felt across a large region near the center and well eastward through the FL panhandle. Don't focus on just center track. Heavy rains will set up with the counter clockwise spin coming onshore east of storm center feeding off unlimited supply of Gulf moisture. Small brief tornadoes will continue to occur for the next several days, mostly to the NE of storm center. These typically travel with the band they are in. The counter clockwise spin of storm will already begin to push water levels higher starting today, this will slowly continue to build until the storm comes inland. This will put prolonged strain on the levee systems through multiple high tide cycles.

Haven't had a chance to listen to it yet but always recommend listening/watching Levi's discussion videos: https://youtu.be/cZM6U84xWOY

[Psychoma]

And there’s the new storms firing up closer to the center as the sun sets, a sign of the expected strengthening, if holds:
https://twitter.com/tropicaltidbits/...89679978332164

[Psychoma]

Sun 10pEDT/9pCDT: My last post of the evening. Storms firing up near but not fully around the center, so still a little offset structure wise, but improving. Recon in storm not seeing pressure drop or wind increase yet. Likely by morning we're closer to Hurricane strength though if those storms continue and don't fade away.

[Psychoma]

11p Sunday: the cone map was slightly bumped to the East and Warnings were therefore extended further East.

[Psychoma]

Mon 14Sept 5aEDT/4aCDT:
Winds 60mph(95km/h)
Moving WNW 9mph(15km/h)
Pressure 996mb
Center about 120miles(195km) ESE of mouth of MS River
Center about 175miles(280km) SE of Biloxi, MS
TS winds extend up to 125miles(205km) from center

Basically unchanged overnight. Hasn't taken opportunity to strengthen yet but should start steadily increasing later today at some point. NHC has lowered max wind forecast down slightly to 85mph.

[Psychoma]

First Monday morning after sunrise air recon showing us storm is still offset structure wise with calm winds near the center and to the NE some, 40-50mph winds between center and LA, but strongest winds well removed NE of center where the main storms are located.
https://twitter.com/tropicaltidbits/...86318919614464

Those are some intense thunderstorms building in that area well NE of center:
https://twitter.com/mikefischerwx/st...82814922596353

[Psychoma]

Mon 14Sept 10aEDT,9aCDT: Sally may be attempting to jump its center to the more intense storms this morning, if occurs then would allow for strengthening to resume.
https://twitter.com/tropicaltidbits/...05997285470209

[Psychoma]

Mon 14Sept 11aEDT/10aCDT:
Winds 65mph(100km/h)
Moving WNW 6mph(9km/h)
Pressure 991mb
Center about 140miles(230km) ESE of mouth of MS River
Center about 185miles(295km) SE of Biloxi, MS
TS winds extend up to 125miles(205km) from center, just offshore now.

NHC confirms center relocation to the Northeast to area of more intense storms. And storm is immediately taking advantage with pressure dropping, winds will be increasing this afternoon. The track & Warnings along the coast have also shifted slightly East.

Surge beginning to show especially at high tide:
https://twitter.com/brianemfinger/st...13967415066624

Some of the surge gauges are accessible thru this Map:
https://tidesandcurrents.noaa.gov/in...orm/Sally.html

[Psychoma]

Mon 14Sept 12pEDT/11aCDT:
Winds 85mph(140km/h)
Moving WNW 6mph(9km/h)
Pressure 985mb

Has rapidly strengthened into a Cat1 hurricane with pressure dropping quickly, eyewall feature appearing on radar.