Cloud Stalker: Tropical Storm Bertha

Wednesday, May 27, 2020

Tropical Storm Bertha

...SPECIAL FEATURES

Tropical Storm Bertha is located near 33.3N 79.5W at 27/1530 UTC 
or 35 nm NE of Charleston, South Carolina and is moving N at 
15 kt. The estimated minimum central pressure is 1005 mb. 
Maximum sustained wind speed is 35 kt with gusts to 45 kt. 
Scattered moderate convection surrounds the center of the storm 
with rainbands moving well inland across South Carolina and the 
northern SC coast in addition to southern North Carolina. 
Scattered moderate convection is also to the east of the low 
center from 32N-34N between 77W-80W. Bertha will continue to 
generally move northward through tonight with a gradual increase 
in forward speed. Bertha will move inland across eastern and 
northern South Carolina later today and into central North 
Carolina by tonight.  See the latest NHC forecast/advisory at 
https://www.nhc.noaa.gov/text/MIATCMAT2.shtml for more detail
 forecaster AReinhart
https://www.facebook.com/cloudstalker/videos/10158469389923330/ 
Bertha at landfall from my Radar app.
 
  
    
  

Bertha has been downgraded to a tropical depression as of the two pm advisory.

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HAIL (3/4 inch or greater)

Hail can cause significant damage to your vehicle, break windows and damage roofs of homes and businesses.
Hail can cause significant bodily injuries such as broken bones and even blindness if wind blown.
Softball (4.5 inches) sized hail was reported in Lake Wales, Florida on March 30, 1996.
Haildrifts, up to four feet deep of dime to nickel sized hail, occurred in low-lying areas near Zephyrhills, Florida on January 29, 1997.
Hailstones the size of softballs can fall at speeds faster than 100 mph

supercell

Supercells derive their rotation through tilting of horizontal vorticity (an invisible horizontal vortex) caused by wind shear. Strong updrafts lift the air turning about a horizontal axis and cause this air to turn about a vertical axis. This forms the deep rotating updraft, the mesocyclone.
A cap or capping inversion is usually required to form a downdraft of sufficient strength. The cap puts an inverted (warm-above-cold) layer above a normal (cold-above-warm) boundary layer, and by preventing warm surface air from sinking too far, allows one or both of the following:
Air below the cap warms and/or becomes more moist
Air above the cap cools
This creates a warmer, moister layer below a cooler layer, which is increasingly unstable (because warm air is less dense and tends to rise). When the cap weakens or moves, explosive development follows.
In North America, supercells usually show up on Doppler radar as starting at a point or hook shape on the southwestern side, fanning out to the northeast. The heaviest precipitation is usually on the southwest side, ending abruptly short of the rain-free updraft base or main updraft (not visible to radar). The rear flank downdraft, or RFD, carries precipitation counterclockwise around the north and northwest side of the updraft base, producing a "hook echo" that indicates the presence of a mesocyclone.