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BULLETIN
Tropical Storm Norma Intermediate Advisory Number 18A
NWS National Hurricane Center Miami FL       EP172023
1200 AM MDT Sun Oct 22 2023
 
...HEAVY RAINFALL FROM NORMA SPREADING INTO WESTERN MAINLAND 
MEXICO...
 
 
SUMMARY OF 1200 AM MDT...0600 UTC...INFORMATION
-----------------------------------------------
LOCATION...24.0N 109.6W
ABOUT 150 MI...240 KM WSW OF CULIACAN MEXICO
ABOUT 205 MI...335 KM WNW OF MAZATLAN MEXICO
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NE OR 35 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...989 MB...29.21 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Tropical Storm Warning is in effect for...
* Santa Fe to San Evaristo
* Topolobampo to Mazatlan
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
 
Interests elsewhere in Baja California Sur and along the west coast
of mainland Mexico should monitor the progress of Norma.
 
For storm information specific to your area, please monitor
products issued by your national meteorological service.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 1200 AM MDT (0600 UTC), the center of Tropical Storm Norma was
located near latitude 24.0 North, longitude 109.6 West. Norma is
moving toward the northeast near 7 mph (11 km/h). This general
motion should continue through tonight, followed by a turn toward
the east-northeast on later today and tonight. On the forecast 
track, the center is forecast to approach the west coast of 
mainland Mexico today and move inland within the tropical storm 
warning area on tonight or early Monday.
 
Maximum sustained winds are near 65 mph (100 km/h) with higher 
gusts. Weakening is expected during the next day or two, but Norma 
is expected to approach the west coast of mainland Mexico as a 
tropical storm.
 
Tropical-storm-force winds extend outward up to 140 miles (220 km)
from the center.
 
The estimated minimum central pressure is 989 mb (29.21 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Norma can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDEP2 and WMO header WTPZ42 KNHC
and on the web at hurricanes.gov/text/MIATCDEP2.shtml
 
WIND:  Tropical storm conditions are ongoing within the tropical
storm warning areas in Baja California Sur. Tropical storm
conditions are expected in the warning area along the west coast of
mainland Mexico later this morning.
 
RAINFALL:  Norma will produce rainfall totals of 6 to 12 inches with
maxima of 18 inches across the southern portion of Baja California
Sur through today and through Sinaloa into Monday.  These rains
will produce flash and urban flooding, along with mudslides in areas
of higher terrain.
 
STORM SURGE:  A dangerous storm surge is likely to produce coastal
flooding in areas of onshore winds within the tropical storm warning
area in Baja California Sur through the overnight hours. Near the 
coast, the surge will be accompanied by large and dangerous waves. 
Coastal flooding is possible along the west coast of mainland 
Mexico within the tropical storm warning area.
 
SURF:  Swells generated by Norma will continue to affect the coast
of southwestern and west-central Mexico and Baja California Sur for
the next couple of days. These swells are likely to cause
life-threatening surf and rip current conditions. Please consult
products from your local weather office.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 300 AM MDT.
 
$$
Forecaster Brown
 
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