####018003839####
WTPZ32 KNHC 220557

TCPEP2

 

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