HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1030 UTC THU SEP 20 2018
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS
SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE
HEIGHT OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE
MORE THAN TWICE THE SIGNIFICANT WAVE HEIGHT.
SECURITE
E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE
EQUATOR E OF 120W
SYNOPSIS VALID 0600 UTC THU SEP 20.
24 HOUR FORECAST VALID 0600 UTC FRI SEP 21.
48 HOUR FORECAST VALID 0600 UTC SAT SEP 22.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.REMNANTS OF NINETEEN-E OVER LAND NEAR 28.1N 110.0W 1003 MB AT
0900 UTC SEP 20 MOVING NNE OR 020 DEG AT 8 KT. MAXIMUM SUSTAINED
WINDS 20 KT GUSTS 30 KT. GULF OF CALIFORNIA BETWEEN 24N AND 26N
SW WINDS 20 TO 25 KT. SEAS TO 8 FT.
.12 HOUR FORECAST TROPICAL DEPRESSION NINETEEN-E OVER LAND NEAR
28.5N 109.8W. MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT. OVER
FORECAST WATERS WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST...DISSIPATED.
.N OF 28N BETWEEN 120W AND 128W WINDS 20 KT OR LESS. SEAS 8 TO 9
FT IN NW TO N SWELL.
.24 HOUR FORECAST N OF 28N BETWEEN 124W AND 128W WINDS 20 KT OR
LESS. SEAS 8 FT IN N SWELL.
.48 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.FROM 14N TO 19N W OF 130W WINDS 20 KT OR LESS. SEAS TO 8 FT IN
NE SWELL.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.
CONVECTION VALID AT 0830 UTC THU SEP 20...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N79W TO 12N110W...RESUMES FROM LOW PRES
NEAR 17N119W TO 13N125W TO 12N140W. SCATTERED MODERATE FROM 07N
TO 10N BETWEEN 108W AND 117W...AND WITHIN 30 NM OF AXIS BETWEEN
122W AND 130W.
$$
.FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.
Tropical Depression Nineteen-E Discussion Number 1
NWS National Hurricane Center Miami FL EP192018
Issued by the NWS Weather Prediction Center College Park MD
900 AM MDT Wed Sep 19 2018
Satellite images show that an area of low pressure has developed
over the Gulf of California overnight within an inverted trough.
This is also supported by 24-hour pressure falls of 3.7 mb at Loreto
just west of its center at 1300 UTC. Microwave imagery shows
curved convective banding features to the east and north of the
center, suggesting organized convection. Therefore the system
is being declared a tropical depression with 25-kt maximum sustained
winds. Infrared imagery shows minimal vertical wind shear over the
system, with a slight restriction to the outflow on its western
side, which is confirmed by recent SHIPS output. However, the
system has only 12 hours or less over water, and it is expected to
move inland without significant strengthening.
An upper-level trough moving into the western United States is
expected to steer the depression north or north-northeast across the
Gulf of California into northwest Mexico tonight, which is well
advertised by the track guidance. The depression is expected to
dissipate in the 24-36 hour time frame due to steep terrain.
The main impact with the system is expected to be heavy rainfall,
with 5-10 inch areal average amounts and local amounts to 15 inches
leading to life-threatening flash flooding and landslides near the
track of the depression.
1. A large area of disorganized showers and thunderstorms extending
from the southern Baja California peninsula northeastward over the
southern and central portions of the Gulf of California are
associated with a broad area of low pressure. Although the
thunderstorm activity has increased and become more concentrated
this morning, the system is forecast to move northward into
northwestern mainland Mexico tonight limiting its development
potential. Regardless of development, this disturbance is
expected to produce total rain accumulations of 5 to 10 inches,
with isolated maximum amounts of 15 inches across portions of Baja
California Sur, Sinaloa, and Sonora through Thursday. This rainfall
may cause life-threatening flash floods and mudslides. Moisture
from this disturbance will also lead to areas of heavy rainfall and
a risk of flash flooding in the southwestern United States
beginning today.
* Formation chance through 48 hours...low...30 percent.
* Formation chance through 5 days...low...30 percent.
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