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Tropical Storm Hanna Advisory Number 15
NWS National Hurricane Center Miami FL AL082020
1000 AM CDT Sun Jul 26 2020
...CENTER OF HANNA CONTINUES TO MOVE INLAND OVER NORTHEASTERN
...HEAVY RAIN AND DANGEROUS FLASH FLOODING CONTINUES OVER FAR
SOUTHEAST TEXAS AND NORTHEAST MEXICO...
SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION
ABOUT 75 MI...120 KM NE OF MONTERREY MEXICO
ABOUT 90 MI...150 KM W OF MCALLEN TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...WSW OR 250 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...995 MB...29.39 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warning along the coast of Texas south of Baffin
Bay has been discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Barra el Mezquital Mexico to the Mouth of the Rio Grande
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 1000 AM CDT (1500 UTC), the center of Tropical Storm Hanna was
located near latitude 26.1 North, longitude 99.7 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 45 mph (75 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 night.
Tropical-storm-force winds extend outward up to 105 miles (165 km)
from the center.
The estimated minimum central pressure is 995 mb (29.39 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 several hours, and along the coast of Mexico
within the warning area for a few more 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 intermediate advisory at 100 PM CDT.
Next complete advisory at 400 PM CDT.