1. Life-threatening storm surge is occurring along portions of the Texas coast from Port Mansfield to Sargent, where a Storm Surge Warning is in effect. Residents in these locations should follow advice given by local emergency officials.

2. Hurricane conditions are expected along the Texas coast from Port Mansfield to Mesquite Bay, where a Hurricane Warning is in effect. Tropical storm conditions are expected to first reach the coast within the warning area this morning.

3. Hanna is expected to produce heavy rains across portions of southern Texas and northeastern Mexico. These rains could result in life-threatening flash flooding and isolated minor to moderate river flooding.xx

CHANGES WITH THIS ADVISORY:

None.

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 lifethreatening 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 lifethreatening 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.

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 Port Aransas including Corpus Christi Bay...46 ft Port Mansfield to Baffin Bay...24 ft North of Port Aransas to Sargent including Copano Bay , Aransas Bay, San Antonio Bay, and Matagorda Bay...24 ft Mouth of the Rio Grande to Port Mansfield...13 ft North of Sargent to High Island including Galveston Bay...12 ft

The deepest water will occur along the immediate coast near and to the right of the landfall location. Surgerelated 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 lifethreatening 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 lifethreatening 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.

At 100 PM CDT (1800 UTC), the center of the eye of Hurricane Hanna was located by NOAA Doppler weather radars and buoy data near latitude 27.0 North, longitude 96.7 West. Hanna is moving toward the west near 8 mph (13 km/h). A gradual turn toward the westsouthwest 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 Doppler weather radars indicate that maximum sustained winds are near 80 mph (130 km/h) with higher gusts. Some slight strengthening is still possible before Hanna makes landfall later today. Rapid weakening is expected after Hanna moves inland.

Hurricaneforce winds extend outward up to 25 miles (35 km) from the center and tropicalstormforce winds extend outward up to 90 miles (150 km). A TCOON observation station at Laguna Madre, Texas, recently reported a sustained wind of 54 mph (91 km/h) and a gust to 70 mph (113 km/h).

Reports from NOAA buoy 42020 located near the center of Hanna's eye indicate that the minimum central pressure is 977 mb (28.85 inches).

NOAA Doppler radar data from Corpus Christi and Brownsville, Texas, along with reconnaissance data from the NOAA Hurricane Hunters indicate that Hanna has continued to strengthen this morning. A well-defined but fairly large 30-35-nmi-wide eye has formed and recent dropsonde data from the eye indicate that the central pressure has dropped to 978 mb. The aircraft measured a peak 700-mb flight-level wind speed of 77 kt, which equates to about 69 kt at the surface. During the past hour, Doppler velocities have sharply increased with numerous patches of 85-90 kt between 7000-8000 ft common in the northern eyewall. Although these values would typically correspond to surface winds of about 75 kt, the Doppler velocity are occurring in low reflectivity regions of 25-30 dBZ, so the full effect of those winds are likely not reaching the surface. This could be why the highest SFMR surface wind observed by the aircraft was only 63 kt. The initial intensity has been increased to 70 kt, which is a blend of the aircraft flight-level, radar, and SFMR surface wind speed estimates. The center position is a tad north of the recon fixes due to some southward tilt of the eye caused by northerly shear. This has resulted in a slower westward motion of 270/06 kt. The ridge to the north of the hurricane has been slowly building westward and southwestward based on upper-air data over the past 24 hours. This slow ridging pattern is expected to continue for the next 48 hours, resulting in Hanna gradually turning toward the west-southwest by late this afternoon or evening, with landfall occurring in about 12 h along south Texas coast. After landfall, Hanna should continue its west-southwestward motion until dissipation over the mountainous terrain of northeastern Mexico in 48-60 h. The new NHC track forecast is similar to the previous advisory track, and lies close to the tightly packed consensus model guidance.

Although the deep-layer vertical wind shear is expected to remain out of the north-northwest to north at about 20 kt, the relatively large and stable eye, along with the expected convective vigor of the hurricane, could result in a little more strengthening just before landfall occurs. After landfall, rapid weakening of the wind field is expected. However, the weakening peak winds will have no negative effect on the likelihood for heavy rainfall or the possibility of isolated tornadoes developing.