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BULLETIN
Tropical Storm Norma Intermediate Advisory Number 17A
NWS National Hurricane Center Miami FL       EP172023
600 PM MDT Sat Oct 21 2023
 
...NORMA NOW A TROPICAL STORM OVER BAJA CALIFORNIA SUR...
...HEAVY RAINS AND FLASH FLOODING TO CONTINUE THROUGH THE WEEKEND...
 
 
SUMMARY OF 600 PM MDT...0000 UTC...INFORMATION
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LOCATION...23.3N 109.8W
ABOUT 30 MI...45 KM NNE OF CABO SAN LUCAS MEXICO
ABOUT 215 MI...350 KM W OF MAZATLAN MEXICO
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NNE OR 30 DEGREES AT 6 MPH...9 KM/H
MINIMUM CENTRAL PRESSURE...986 MB...29.12 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
The government of Mexico has changed the Hurricane Warning from 
Todos Santos to Los Barriles to a Tropical Storm Warning.
 
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 within 36 hours.
 
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 600 PM MDT (0000 UTC), the center of Tropical Storm Norma was 
located near latitude 23.3 North, longitude 109.8 West. Norma is 
moving toward the north-northeast near 6 mph (9 km/h). This general 
motion should continue through tonight, followed by a turn toward 
the northeast and east-northeast on Sunday and Sunday night. On the 
forecast track, the center of Norma is expected to continue moving 
across the southern portion of Baja California Sur tonight. Norma is 
forecast to move toward the west coast of mainland Mexico on Sunday 
and move inland within the tropical storm warning area on Sunday 
night or early Monday.
 
Maximum sustained winds have decreased to near 70 mph (110 km/h)
with higher gusts. Continued weakening is expected during the next
couple of days, and 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).
 
The estimated minimum central pressure is 986 mb (29.12 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 occurring within the tropical 
storm warning areas in Baja California Sur. Tropical storm 
conditions are expected in the warning area along the west coast of 
Mexico by early Sunday.
 
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 Sunday and across much of Sinaloa through 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. Near the coast, the surge will be 
accompanied by large and destructive 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
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Next complete advisory at 900 PM MDT.
 
$$
Forecaster Kelly
 
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