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BULLETIN

Hurricane Hanna Advisory Number 11

NWS National Hurricane Center Miami FL AL082020

1000 AM CDT Sat Jul 25 2020

...HANNA CONTINUING TO STRENGTHEN AS IT CRAWLS CLOSER TO THE SOUTH

TEXAS COAST...

...GUSTY SQUALLS OCCURRING ALONG THE CENTRAL TEXAS COAST...

SUMMARY OF 1000 AM CDT...1500 UTC...INFORMATION

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LOCATION...27.1N 96.3W

ABOUT 75 MI...120 KM ENE OF PORT MANSFIELD TEXAS

ABOUT 85 MI...135 KM SE OF CORPUS CHRISTI TEXAS

MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H

PRESENT MOVEMENT...W OR 270 DEGREES AT 7 MPH...11 KM/H

MINIMUM CENTRAL PRESSURE...978 MB...28.88 INCHES

WATCHES AND WARNINGS

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CHANGES WITH THIS ADVISORY:

The Tropical Storm Warning has been discontinued north of Sargent,

Texas.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...

* Port Mansfield to Sargent Texas

A Hurricane Warning is in effect for...

* Port Mansfield to Mesquite Bay Texas

A Tropical Storm Warning is in effect for...

* Barra el Mezquital Mexico to Port Mansfield Texas

* Mesquite Bay to Sargent Texas

A Storm Surge Warning means there is a danger of life-threatening

inundation, from rising water moving inland from the coastline,

during the next 24 hours in the indicated locations. For a depiction

of areas at risk, please see the National Weather Service Storm

Surge Watch/Warning Graphic, available at hurricanes.gov. This is a

life-threatening situation. Persons located within these areas

should take all necessary actions to protect life and property from

rising water and the potential for other dangerous conditions.

Promptly follow evacuation and other instructions from local

officials.

A Hurricane Warning means that hurricane conditions are expected

somewhere within the warning area, in this case within the next 12

hours. Preparations to protect life and property should be rushed

to completion.

A Tropical Storm Warning means that tropical storm conditions are

expected somewhere within the warning area, in this case within

the next 12 hours.

Interests elsewhere along the Texas and Louisiana coasts should

monitor the progress of Hanna. Interests in northeastern Mexico

should also monitor the progress of this hurricane.

For storm information specific to your area, including possible

inland watches and warnings, please monitor products issued by your

local National Weather Service forecast office.

DISCUSSION AND OUTLOOK

----------------------

At 1000 AM CDT (1500 UTC), the center of the eye of Hurricane Hanna

was located by reconnaissance aircraft and NOAA Doppler weather

radars near latitude 27.1 North, longitude 96.3 West. Hanna is

moving toward the west near 7 mph (11 km/h), and this motion should

continue through this morning. A gradual turn toward the

west-southwest is expected by late afternoon and tonight, and that

motion should continue through Sunday. On the forecast track, the

center of Hanna should make landfall along the Texas coast within

the hurricane warning area by late afternoon or early this evening.

Data from the NOAA Hurricane Hunter aircraft and Doppler weather

radars indicate that maximum sustained winds have increased to near

80 mph (130 km/h) with higher gusts. Some further strengthening is

possible before Hanna makes landfall later today. Rapid weakening is

expected after Hanna moves inland.

Hurricane-force winds extend outward up to 25 miles (35 km) from the

center and tropical-storm-force winds extend outward up to 90 miles

(150 km).

Reports from the NOAA Hurricane Hunter aircraft indicate that the

minimum central pressure is 978 mb (28.88 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: The combination of a dangerous storm surge and the

tide will cause normally dry areas near the coast to be flooded by

rising waters moving inland from the shoreline. The water could

reach the following heights above ground somewhere in the indicated

areas if the peak surge occurs at the time of high tide...

Baffin Bay to Mesquite Bay including Corpus Christi Bay, Copano Bay,

and Aransas Bay...3-5 ft

Port Mansfield to Baffin Bay...2-4 ft

Mesquite Bay to Sargent including San Antonio Bay and Matagorda

Bay...2-4 ft

Mouth of the Rio Grande to Port Mansfield...1-3 ft

North of Sargent to High Island including Galveston Bay...1-2 ft

The deepest water will occur along the immediate coast near and to

the right of the landfall location. Surge-related flooding depends

on the relative timing of the surge and the tidal cycle, and can

vary greatly over short distances. For information specific to your

area, please see products issued by your local National Weather

Service forecast office.

WIND: Hurricane conditions are expected in the warning area

this afternoon. Tropical storm conditions are occuring in

portions of the warning area and will spread inland through the

afternoon and evening.

RAINFALL: Hanna is expected to produce 6 to 12 inches of rain with

isolated maximum totals of 18 inches through Sunday night in south

Texas and into the Mexican states of Coahuila, Nuevo Leon, and

northern Tamaulipas. This rain may result in life-threatening flash

flooding, rapid rises on small streams, and isolated minor to

moderate river flooding in south Texas.

3 to 5 inches of rain is expected along the upper Texas and

Louisiana coasts.

SURF: Swells generated by Hanna are expected to increase and affect

much of the Texas and Louisiana coasts during 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.

TORNADOES: A few tornadoes are possible today and overnight over

parts of the lower to middle Texas coastal plain.

NEXT ADVISORY

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Next intermediate advisory at 100 PM CDT.

Next complete advisory at 400 PM CDT.

$$

Forecaster Stewart