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Tropical Storm Hanna Intermediate Advisory Number 15A
NWS National Hurricane Center Miami FL AL082020
100 PM CDT Sun Jul 26 2020
...HANNA MOVING WEST-SOUTHWESTWARD OVER NORTHEASTERN MEXICO...
...HEAVY RAIN AND DANGEROUS FLASH FLOODING CONTINUES OVER FAR
SOUTHEAST TEXAS AND NORTHEAST MEXICO...
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 10 MI...15 KM N OF MONTERREY MEXICO
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...WSW OR 250 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The government of Mexico has discontinued the Tropical Storm Watch
along the coast of northeastern Mexico.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
There are no coastal watches or warnings in effect.
Interests in northeastern Mexico should monitor the progress of
For storm information specific to your area, please monitor
products issued by your national meteorological service.
DISCUSSION AND OUTLOOK
At 100 PM CDT (1800 UTC), the center of Tropical Storm Hanna was
located near latitude 25.9 North, longitude 100.1 West. Hanna is
moving toward the west-southwest near 9 mph (15 km/h) and this
motion is expected to continue through Monday. On the forecast
track, the center of Hanna should continue to move farther inland
over northeastern Mexico through tonight.
Maximum sustained winds have decreased to near 40 mph (65 km/h)
with higher gusts. Additional weakening is expected as the center
of Hanna moves farther inland, and the cyclone is expected to weaken
to a tropical depression later today and dissipate Monday or Monday
Tropical-storm-force winds extend outward up to 105 miles (165 km)
from the center. A wind gust to 39 mph (63 km/h) was recently
reported at Monterrey, Mexico.
The estimated minimum central pressure is 1000 mb (29.53 inches).
HAZARDS AFFECTING LAND
Key messages for Hanna can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3, WMO header WTNT43 KNHC and
on the web at www.hurricanes.gov/text/MIATCDAT3.shtml.
STORM SURGE: Water levels along the Texas coast will gradually
subside through this afternoon. Consult products issued by your
local National Weather Service forecast office for additional
WIND: Tropical storm conditions will continue near the center of
Hanna for the next few hours.
RAINFALL: Hanna is expected to produce the following rain
accumulations and flood threats through Monday:
South Texas...Additional 2 to 5 inches. Storm total amounts 6 to 12
inches, isolated 16 inches.
Northern Mexican states of Coahuila, Nuevo Leon, Tamaulipas...6 to
12 inches, isolated 16 inches.
Northern Mexican states of northern Zacatecas and eastern
Durango...1 to 4 inches.
This rain will produce life-threatening flash flooding, rapid rises
on small streams, and isolated minor to moderate river flooding in
South Texas. Flash flooding and mudslides are likely across Northern
SURF: Swells generated by Hanna will continue to affect much
of the Texas and Louisiana coasts for another day or so. These
swells are likely to cause life-threatening surf and rip current
conditions. Please consult products from your local weather
TORNADOES: A few tornadoes are possible today into this evening
across parts of south Texas.
Next complete advisory at 400 PM CDT.