I think the largest concern with Cristobal examining the information currently available, will be from coastal flooding. All the forecasters are talking about flooding not an issue. IMHO, they are focused on non-coastal lands.
St. Mary, Terrebonne, Lafourche and Plaquemines parishes should watch for the storm surge. I don’t believe it should be a major concern. However, in Terrebonne, our levy system has not been tested with a storm approaching us from the west.
If wise, the parish authorities will be monitoring and seeing what improvements could be made to the parish levy and drainage systems.
Tropical Storm Cristobal Discussion Number 11
NWS National Hurricane Center Miami FL AL032020
400 AM CDT Thu Jun 04 2020Satellite imagery and radar data from Sabancuy, Mexico indicate
that Cristobal has resumed a southeastward drift and moved farther
inland. There is no data from near the core of the storm, so the
maximum intensity is set to a possibly generous 35 kt based on
continuity from the previous advisory and earlier scatterometer
data that showed 35 kt winds over water to the northwest of the
center.The initial motion is a drifting 125/2 kt. A slow eastward motion
is expected today. After that, southerly flow associated with a
strengthening ridge over the western Atlantic and a developing
mid-/upper-level trough over northern Gulf of Mexico should turn
Cristobal northward with some increase in forward speed. Later in
the forecast period, a north-northwestward or northward motion is
expected as Cristobal interacts with the trough, with most of the
track forecast guidance bringing the system to the northern Gulf
coast between 96-120 h. The new forecast track has no significant
changes from the previous track, and it lies near the various
consensus models.Cristobal should weaken to a depression in the next few hours as
the center drifts farther inland. Little subsequent change in
strength is likely through 24 h due to much of the circulation
remaining over water. By 36 h, the global model guidance suggest
that winds will increase over the Gulf of Mexico well northeast of
the center, so the new intensity forecast calls for Cristobal to
regain tropical storm status at that time. From 48-120 h, Cristobal
is forecast to interact with the trough over the Gulf of Mexico,
which is likely to cause dry air entrainment and some shear. The
intensity guidance suggests these conditions will allow only
gradual intensification, so the new forecast follows the trend of
the previous forecast in showing a peak intensity of 50 kt before
landfall on the northern Gulf coast.The global models indicate that Cristobal’s wind field will expand
as the cyclone deepens over the south-central Gulf of Mexico.
Therefore, the size of the NHC wind radii have again been increased
primarily over the eastern semicircle at 36-72 hours. Indeed,
the models suggest that when the storm reaches the northern Gulf
coast the worst conditions may occur at a large distance from the
center.
Key Messages:
1. Damaging and deadly flooding was already occurring in portions
of Mexico and Central America. Cristobal is expected to produce
additional extreme rainfall amounts through the end of the week. The
heaviest additional rainfall is expected over far southern Mexico
and portions of the Yucatan Peninsula, while also extending along
the Pacific coast from Chiapas to Guatemala and El Salvador. This
rainfall could cause widespread life-threatening flash floods and
mudslides. Refer to products from your local weather office for
more information.
2. Even though Cristobal is inland, tropical storm conditions will
continue along and near the coast of Mexico for a few more hours,
especially over western Campeche, eastern Tabasco, and northern
Chiapas states.
3. Cristobal is forecast to re-emerge over the southern Gulf of
Mexico on Friday and move northward over the central and northern
Gulf of Mexico over the weekend. There is a risk of storm surge,
heavy rainfall, and wind impacts beginning over the weekend along
portions of the U.S. Gulf Coast from Texas to the Florida Panhandle.
While it is too soon to determine the exact location, timing, and
magnitude of these impacts, interests in these areas should monitor
the progress of Cristobal and ensure they have their hurricane plan
in place.
FORECAST POSITIONS AND MAX WINDS
INIT 04/0900Z 17.9N 91.3W 35 KT 40 MPH…INLAND
12H 04/1800Z 18.0N 91.0W 30 KT 35 MPH…INLAND
24H 05/0600Z 18.7N 90.5W 30 KT 35 MPH…INLAND
36H 05/1800Z 20.2N 90.4W 35 KT 40 MPH…INLAND
48H 06/0600Z 22.1N 90.5W 40 KT 45 MPH…OVER WATER
60H 06/1800Z 23.9N 90.7W 45 KT 50 MPH
72H 07/0600Z 25.8N 90.8W 50 KT 60 MPH
96H 08/0600Z 29.5N 91.5W 50 KT 60 MPH
120H 09/0600Z 34.0N 92.5W 30 KT 35 MPH…INLAND
$$
Forecaster Beven
