BULLETIN
Tropical Storm Bertha Special Advisory Number 1
NWS National Hurricane Center Miami FL AL022020
830 AM EDT Wed May 27 2020
...TROPICAL STORM BERTHA FORMS NEAR THE COAST OF SOUTH CAROLINA...
...TROPICAL STORM WARNING ISSUED AND HEAVY RAINFALL EXPECTED...
SUMMARY OF 830 AM EDT...1230 UTC...INFORMATION
----------------------------------------------
LOCATION...32.7N 79.4W
ABOUT 30 MI...50 KM ESE OF CHARLESTON SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...1009 MB...29.80 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
A Tropical Storm Warning is in effect for the coast of South
Carolina from Edisto Beach to South Santee River.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Edisto Beach SC to South Santee River SC
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning, in this case in the next few
hours.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
----------------------
At 830 AM EDT (1230 UTC), the center of Tropical Storm Bertha was
located near latitude 32.7 North, longitude 79.4 West. Bertha is
moving toward the northwest near 9 mph (15 km/h) and this motion is
expected to continue through tonight. On the forecast track the
center of Bertha will move onshore in the warning area in the next
few hours and the move inland across eastern and northern South
Carolina later today and into west-central North Carolina by
tonight.
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Bertha is expected to weaken to a tropical depression after moving
inland and become a remnant low tonight.
Tropical-storm-force winds extend outward up to 25 miles (35 km)
from the center.
The estimated minimum central pressure is 1009 mb (29.80 inches).
HAZARDS AFFECTING LAND
----------------------
RAINFALL: Bertha is expected to produce total rain accumulation of
2 to 4 inches with isolated totals of 8 inches across eastern and
central South Carolina into west central to far southeastern
North Carolina and southwest Virginia. This rainfall may produce
life-threatening flash flooding.
WIND: Tropical storm conditions are expected to reach the coast
within the warning area in the next couple of hours.
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM EDT.
$$
Forecaster Brennan
Tropical Storm Bertha Special Discussion Number 1
NWS National Hurricane Center Miami FL AL022020
830 AM EDT Wed May 27 2020
The area of disturbed weather that NHC has been tracking over the
past day or so has quickly become better organized this morning.
The circulation has become better defined and the center has
reformed beneath the area of deep convection just offshore of the
coast of South Carolina. Recent NWS Doppler radar data from
Charleston and buoy data indicates that the system is producing
tropical-storm-force winds. Therefore, advisories are being
initiated on Tropical Storm Bertha. The system will be moving
inland very shortly and little, if any, additional strengthening is
expected. Once inland, the small tropical cyclone should weaken
rapidly and dissipated over central North Carolina on Thursday.
There is very little continuity on the initial motion since the
center has only recently formed. The best estimate of the initial
motion is 320/8 kt. The system should continue to move generally
northwestward around the western side of a mid-level ridge located
over the western Atlantic. The track guidance is in good agreement
on this scenario, and the NHC track forecast is close to a blend of
the GFS and ECMWF models.
Key Messages:
1. Bertha is expected to produce heavy rainfall across portions of
eastern and central South Carolina, west-central to far
southeastern North Carolina, and southwest Virginia. This rainfall
may produce life-threatening flash flooding.
2. Bertha is expected to bring tropical storm winds to portions of
the South Carolina coast within the warning area in the next few
hours.
FORECAST POSITIONS AND MAX WINDS
INIT 27/1230Z 32.7N 79.4W 40 KT 45 MPH
12H 27/1800Z 33.2N 80.0W 30 KT 35 MPH...INLAND
24H 28/0600Z 35.8N 81.0W 20 KT 25 MPH...INLAND
36H 28/1800Z...DISSIPATED
$$
Forecaster Brennan/Brown
Tropical Storm Bertha Special Advisory Number 1
NWS National Hurricane Center Miami FL AL022020
830 AM EDT Wed May 27 2020
...TROPICAL STORM BERTHA FORMS NEAR THE COAST OF SOUTH CAROLINA...
...TROPICAL STORM WARNING ISSUED AND HEAVY RAINFALL EXPECTED...
SUMMARY OF 830 AM EDT...1230 UTC...INFORMATION
----------------------------------------------
LOCATION...32.7N 79.4W
ABOUT 30 MI...50 KM ESE OF CHARLESTON SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...1009 MB...29.80 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
A Tropical Storm Warning is in effect for the coast of South
Carolina from Edisto Beach to South Santee River.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Edisto Beach SC to South Santee River SC
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning, in this case in the next few
hours.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
----------------------
At 830 AM EDT (1230 UTC), the center of Tropical Storm Bertha was
located near latitude 32.7 North, longitude 79.4 West. Bertha is
moving toward the northwest near 9 mph (15 km/h) and this motion is
expected to continue through tonight. On the forecast track the
center of Bertha will move onshore in the warning area in the next
few hours and the move inland across eastern and northern South
Carolina later today and into west-central North Carolina by
tonight.
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Bertha is expected to weaken to a tropical depression after moving
inland and become a remnant low tonight.
Tropical-storm-force winds extend outward up to 25 miles (35 km)
from the center.
The estimated minimum central pressure is 1009 mb (29.80 inches).
HAZARDS AFFECTING LAND
----------------------
RAINFALL: Bertha is expected to produce total rain accumulation of
2 to 4 inches with isolated totals of 8 inches across eastern and
central South Carolina into west central to far southeastern
North Carolina and southwest Virginia. This rainfall may produce
life-threatening flash flooding.
WIND: Tropical storm conditions are expected to reach the coast
within the warning area in the next couple of hours.
NEXT ADVISORY
-------------
Next complete advisory at 1100 AM EDT.
$$
Forecaster Brennan
Tropical Storm Bertha Special Discussion Number 1
NWS National Hurricane Center Miami FL AL022020
830 AM EDT Wed May 27 2020
The area of disturbed weather that NHC has been tracking over the
past day or so has quickly become better organized this morning.
The circulation has become better defined and the center has
reformed beneath the area of deep convection just offshore of the
coast of South Carolina. Recent NWS Doppler radar data from
Charleston and buoy data indicates that the system is producing
tropical-storm-force winds. Therefore, advisories are being
initiated on Tropical Storm Bertha. The system will be moving
inland very shortly and little, if any, additional strengthening is
expected. Once inland, the small tropical cyclone should weaken
rapidly and dissipated over central North Carolina on Thursday.
There is very little continuity on the initial motion since the
center has only recently formed. The best estimate of the initial
motion is 320/8 kt. The system should continue to move generally
northwestward around the western side of a mid-level ridge located
over the western Atlantic. The track guidance is in good agreement
on this scenario, and the NHC track forecast is close to a blend of
the GFS and ECMWF models.
Key Messages:
1. Bertha is expected to produce heavy rainfall across portions of
eastern and central South Carolina, west-central to far
southeastern North Carolina, and southwest Virginia. This rainfall
may produce life-threatening flash flooding.
2. Bertha is expected to bring tropical storm winds to portions of
the South Carolina coast within the warning area in the next few
hours.
FORECAST POSITIONS AND MAX WINDS
INIT 27/1230Z 32.7N 79.4W 40 KT 45 MPH
12H 27/1800Z 33.2N 80.0W 30 KT 35 MPH...INLAND
24H 28/0600Z 35.8N 81.0W 20 KT 25 MPH...INLAND
36H 28/1800Z...DISSIPATED
$$
Forecaster Brennan/Brown