ATL: BONNIE - Post-Tropical - Discussion

[TheStormExpert]

Bonnie looks to have missed its chance to be upgraded to TS status again(though I personally think it peaked at 45-50kts sometime in the past 12hrs. or so).

[cycloneye]

Bonnie looks to have missed its chance to be upgraded to TS status again(though I personally think it peaked at 45-50kts sometime in the past 12hrs. or so).

They for sure will go back after season is over to do the analysis.

[tolakram]

Another blowup of convection firing.

http://weather.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=36&lon=-73&info=vis&zoom=1&width=1000&height=800&quality=90&type=Animation&palette=ir1.pal&numframes=15&mapcolor=black

[wxman57]

Some 35kt winds on the latest ASCAT pass. Looks like a small tropical storm.

[RL3AO]

Some 35kt winds on the latest ASCAT pass. Looks like a small tropical storm.

Yeah. It'll be adjusted in the TCR.

[RL3AO]

Looking at the ASCAT pass from earlier and the new blow up of convection, I'd lean towards it being a TS again at 21z. We will see what happens.

[cycloneye]

Yes! Tropical Storm at 5 PM.

AL, 02, 2016060318, , BEST, 0, 359N, 712W, 35, 1006, TS

[NDG]

Bonnie is about the size of Connecticut.

[cycloneye]

BULLETIN
TROPICAL STORM BONNIE ADVISORY NUMBER 29
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
500 PM EDT FRI JUN 03 2016

...BONNIE AGAIN BECOMES A TROPICAL STORM...


SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...35.9N 70.5W
ABOUT 285 MI...460 KM E OF CAPE HATTERAS NORTH CAROLINA
ABOUT 410 MI...660 KM NW OF BERMUDA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...E OR 90 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 500 PM EDT (2100 UTC), the center of Tropical Storm Bonnie was
located near latitude 35.9 North, longitude 70.5 West. Bonnie is
moving toward the east near 13 mph (20 km/h), and this general
motion is expected to continue for the next couple of days.

Satellite wind data indicate that the maximum sustained winds have
increased to near 40 mph (65 km/h) with higher gusts. Some
weakening is forecast during the next 48 hours, and Bonnie is
forecast to degenerate to a post-tropical low by Saturday.

Tropical-storm-force winds extend outward up to 35 miles (55 km)
mainly to the southeast of the center.

The estimated minimum central pressure is 1006 mb (29.71 inches).


HAZARDS AFFECTING LAND
----------------------
None.


NEXT ADVISORY
-------------
Next complete advisory at 1100 PM EDT.

$$
Forecaster Beven

NNNN


TROPICAL STORM BONNIE DISCUSSION NUMBER 29
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
500 PM EDT FRI JUN 03 2016

Somewhat unexpectedly, the convection associated with Bonnie has
increased this afternoon to the point where the satellite intensity
estimate from TAFB is now 35 kt. In addition, an ASCAT-B overpass
near 1400 UTC showed several 35-kt vectors about 30 n mi southeast
of the center. Based on these data, Bonnie is again designated as
a tropical storm with an initial intensity of 35 kt.

The initial motion is now 090/11. Bonnie should move generally
eastward to east-southeastward between the subtropical ridge to the
south and a developing baroclinic low to the northeast. The model
guidance has shifted a little southward since the last advisory,
and the new forecast track is nudged southward as well.

The current intensification is likely to be short lived, as Bonnie
will be moving over sea surface temperatures colder than 24C in
about 12 hours. Thus, the intensity forecast calls for weakening
through the forecast period, with Bonnie degenerating to a
post-tropical low between 12 and 24 hours. The low should
subsequently weaken to a trough between 48 and 72 hours.

FORECAST POSITIONS AND MAX WINDS

INIT 03/2100Z 35.9N 70.5W 35 KT 40 MPH
12H 04/0600Z 35.9N 68.3W 35 KT 40 MPH
24H 04/1800Z 35.6N 65.1W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 05/0600Z 35.1N 61.4W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 05/1800Z 34.6N 57.6W 25 KT 30 MPH...POST-TROP/REMNT LOW
72H 06/1800Z...DISSIPATED

$$
Forecaster Beven

[cycloneye]

...BONNIE AGAIN BECOMES A TROPICAL STORM...


SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...35.9N 70.5W
ABOUT 285 MI...460 KM E OF CAPE HATTERAS NORTH CAROLINA
ABOUT 410 MI...660 KM NW OF BERMUDA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...E OR 90 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES

[galaxy401]

This storm looks a lot like TD1 in 2009. Looks similar and in the same location, almost the same time of the year too.

[cycloneye]

BULLETIN
TROPICAL STORM BONNIE ADVISORY NUMBER 30
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
1100 PM AST FRI JUN 03 2016

...BONNIE EXPECTED TO BECOME A REMNANT LOW TOMORROW...


SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...35.9N 69.6W
ABOUT 335 MI...540 KM E OF CAPE HATTERAS NORTH CAROLINA
ABOUT 370 MI...595 KM NW OF BERMUDA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...E OR 90 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 1100 PM AST (0300 UTC), the center of Tropical Storm Bonnie was
located near latitude 35.9 North, longitude 69.6 West. Bonnie is
moving toward the east near 12 mph (19 km/h) and a generally
eastward motion with a gradual increase in forward speed is
expected over the next 48 hours.

Maximum sustained winds are near 40 mph (65 km/h) with higher gusts.
Some weakening is forecast during the next 48 hours, and Bonnie is
forecast to degenerate to a remnant low by Saturday.

Tropical-storm-force winds extend outward up to 35 miles (55 km)
from the center.

The estimated minimum central pressure is 1006 mb (29.71 inches).


HAZARDS AFFECTING LAND
----------------------
None.


NEXT ADVISORY
-------------
Next complete advisory at 500 AM AST.

$$
Forecaster Pasch

TROPICAL STORM BONNIE DISCUSSION NUMBER 30
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
1100 PM AST FRI JUN 03 2016

After the burst of deep convection noted earlier today,
thunderstorm activity associated with Bonnie has diminished
considerably with the only remaining convection occurring over a
small area in the southeast quadrant of the circulation. The
maximum wind speed is kept at 35 kt in agreement with a Dvorak
Current Intensity number from TAFB. Given the current lack of deep
convection, this intensity estimate may be generous. Since the
system will be traversing cool waters of near 22 deg C and vertical
shear is forecast to increase to near 30 kt over the next 24-48
hours, Bonnie is predicted to gradually weaken and soon become a
remnant low. Global models show the cyclone becoming absorbed by
another low over the north Atlantic in 48 to 72 hours.

The initial motion estimate is 090/10. Bonnie is moving along the
northern side of a subtropical ridge and the southern edge of the
mid-latitude westerlies, and this steering regime should continue
for the next couple of days. The track model guidance is in
general agreement on a continued eastward motion with some
acceleration over the next 48 hours. The official track forecast
is a blend of the latest GFS and ECMWF output and similar to the
previous NHC track.

FORECAST POSITIONS AND MAX WINDS

INIT 04/0300Z 35.9N 69.6W 35 KT 40 MPH
12H 04/1200Z 35.7N 67.1W 30 KT 35 MPH
24H 05/0000Z 35.4N 64.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 05/1200Z 34.8N 60.1W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 06/0000Z 34.3N 56.0W 25 KT 30 MPH...POST-TROP/REMNT LOW
72H 07/0000Z...DISSIPATED

$$
Forecaster Pasch

[cycloneye]

TROPICAL STORM BONNIE DISCUSSION NUMBER 31
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
500 AM AST SAT JUN 04 2016

Deep convection had essentially vanished, but a new puff of
thunderstorms redeveloped east of the center during the last few
hours. The low-level circulation remains exposed west of the
convective mass due to strong northwesterly vertical wind shear. An
earlier ASCAT pass showed reliable 33-kt winds when the cyclone was
devoid of convection. It is assumed that, with the new convective
burst, tropical-storm-force winds still likely exist. Thus, the
initial wind speed estimate is held at 35 kt. A further increase in
shear and Bonnie's movement over 22 deg C water should cause the
cyclone to degenerate into a remnant low by 24 hours. Global models
show Bonnie opening up into a trough by 48 hours, with its remnants
absorbed by a frontal zone over the central North Atlantic soon
after that. The new NHC intensity forecast is in good agreement
with the previous one and the latest statistical-dynamical guidance.

The initial motion estimate is 090/10. Bonnie continues to be
carried eastward along the southern edge of a nearly zonal flow
over the western Atlantic. The track model guidance shows Bonnie
moving just south of due east with additional acceleration prior to
dissipation. The NHC track forecast is adjusted a bit southward and
is slightly slower than the previous forecast, following the
multi-model consensus.


FORECAST POSITIONS AND MAX WINDS

INIT 04/0900Z 35.9N 68.2W 35 KT 40 MPH
12H 04/1800Z 35.5N 65.8W 35 KT 40 MPH
24H 05/0600Z 34.9N 62.5W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 05/1800Z 34.4N 58.8W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 06/0600Z...DISSIPATED

$$
Forecaster Kimberlain

[tolakram]

Sunrise, live loop

http://weather.msfc.nasa.gov/cgi-bin/get-goes?satellite=GOES-E%20CONUS&lat=36&lon=-65&info=vis&zoom=1&width=1000&height=800&quality=90&type=Animation&palette=ir1.pal&numframes=15&mapcolor=yellow

[cycloneye]

BULLETIN
TROPICAL DEPRESSION BONNIE ADVISORY NUMBER 32
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
1100 AM AST SAT JUN 04 2016

...BONNIE WEAKENS TO A TROPICAL DEPRESSION...


SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...35.6N 66.4W
ABOUT 245 MI...395 KM NNW OF BERMUDA
MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H
PRESENT MOVEMENT...E OR 95 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 1100 AM AST (1500 UTC), the center of Tropical Depression Bonnie
was located near latitude 35.6 North, longitude 66.4 West. The
depression is moving toward the east near 15 mph (24 km/h). An
eastward to east-southeastward motion with a slight increase in
forward speed is expected over the next day or two.

Maximum sustained winds have decreased to near 35 mph (55 km/h) with
higher gusts. Bonnie is forecast to degenerate into a remnant low
by tonight.

The estimated minimum central pressure is 1007 mb (29.74 inches).


HAZARDS AFFECTING LAND
----------------------
None.


NEXT ADVISORY
-------------
Next complete advisory at 500 PM AST.

$$
Forecaster Cangialosi



TROPICAL DEPRESSION BONNIE DISCUSSION NUMBER 32
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
1100 AM AST SAT JUN 04 2016

Bonnie appears to be weakening. The small burst of deep convection
that occurred overnight has been shrinking, and the system is
now devoid of significant thunderstorm activity. Based on the
degraded structure of the system, the initial wind speed has been
lowered to 30 kt, making Bonnie a tropical depression once again.
The depression is over cold water and in a high wind shear
environment. Since these environmental conditions are not expected
to change, Bonnie is forecast to degenerate into a remnant low
by tonight. The remnant low will likely open into a trough within
the next couple of days.

The small cyclone is moving eastward at about 12 kt in the
mid-latitude westerlies. An eastward to east-southeastward motion
at a slightly faster forward speed is expected until Bonnie
dissipates. Little change was made to the previous track prediction,
and the official forecast lies close to a consensus of the GFS and
ECMWF models.

FORECAST POSITIONS AND MAX WINDS

INIT 04/1500Z 35.6N 66.4W 30 KT 35 MPH
12H 05/0000Z 35.1N 64.1W 30 KT 35 MPH
24H 05/1200Z 34.6N 60.7W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 06/0000Z 34.1N 57.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 06/1200Z...DISSIPATED

$$
Forecaster Cangialosi

[cycloneye]

Downgraded to TD.

...BONNIE WEAKENS TO A TROPICAL DEPRESSION...


SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...35.6N 66.4W
ABOUT 245 MI...395 KM NNW OF BERMUDA
MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H
PRESENT MOVEMENT...E OR 95 DEGREES AT 15 MPH...24 KM/H
MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES

[cycloneye]

TROPICAL DEPRESSION BONNIE DISCUSSION NUMBER 33
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
500 PM AST SAT JUN 04 2016

Bonnie has lacked significant deep convection for several hours, and
the compact cyclone mainly consists of a swirl of low-level clouds.
An ASCAT pass from earlier today showed winds near 30 kt in the
southeast quadrant of the circulation, and the initial intensity
is held at that value. Strong wind shear, dry air, and cold waters
should prevent the return of significant thunderstorm activity, and
Bonnie will likely degenerate into a remnant low tonight. Most of
the models show the remnant low dissipating late Sunday or Monday.

The depression has been moving east-southeastward, 110 degrees, at
about 12 kt within the mid-latitude westerlies. A general eastward
to east-southeastward motion with a slight increase in forward
speed is expected until Bonnie dissipates. The official track
forecast is nudged a little to the south of the previous one, to
account for the more southerly initial position and motion, and
lies close to the middle of the guidance envelope.

FORECAST POSITIONS AND MAX WINDS

INIT 04/2100Z 35.0N 65.1W 30 KT 35 MPH
12H 05/0600Z 34.5N 62.7W 30 KT 35 MPH...POST-TROP/REMNT LOW
24H 05/1800Z 34.0N 59.1W 30 KT 35 MPH...POST-TROP/REMNT LOW
36H 06/0600Z 33.3N 55.0W 30 KT 35 MPH...POST-TROP/REMNT LOW
48H 06/1800Z...DISSIPATED

$$
Forecaster Cangialosi

[cycloneye]

POST-TROPICAL CYCLONE BONNIE DISCUSSION NUMBER 34
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022016
1100 PM AST SAT JUN 04 2016

Bonnie has lacked organized deep convection since early this
morning and is basically only a swirl of low clouds. Thus, the
cyclone no longer meets the definition of a tropical cyclone and
has become a post-tropical remnant low. Maximum winds are set to
30 kt. These winds should gradually weaken while the circulation
opens up into a trough over the next day or so. Model guidance is
in good agreement on this system moving east-southeastward until
the low decays into a trough late Sunday or early Monday.

This is the last advisory on Bonnie. Additional information on this
system can be found in High Seas Forecasts issued by the National
Weather Service...under AWIPS header NFDHSFAT1 and WMO header
FZNT01 KWBC.

FORECAST POSITIONS AND MAX WINDS

INIT 05/0300Z 34.7N 63.6W 30 KT 35 MPH...POST-TROP/REMNT LOW
12H 05/1200Z 34.3N 61.1W 25 KT 30 MPH...POST-TROP/REMNT LOW
24H 06/0000Z 33.6N 57.1W 25 KT 30 MPH...POST-TROP/REMNT LOW
36H 06/1200Z...DISSIPATED

$$
Forecaster Blake

[cycloneye]

Bye Bonnie!

1100 PM AST SAT JUN 04 2016

...BONNIE BECOMES A REMNANT LOW...

[galaxy401]

Well I suppose there was a reason why Wxman didn't do Bones the first time around.