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Service Change Notice 12-31

National Weather Service Headquarters Washington DC

350 PM EDT Mon Sep 10 2012

 

To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS partners and NWS employees

 

From:     Mark Tew

          Chief, Marine and Coastal Weather Services Branch

 

          Eli Jacks

          Chief, Fire and Public Weather Services Branch

 

Subject:  ShapeFile Correction and Adjustment for the Upper and

          Lower Houston Ship Channel and Galveston Bay Effective

          October 11, 2012

 

Effective Thursday, October 11, 2012, at 1:00 PM Central Daylight

Time (CDT), 1800 Coordinated Universal Time (UTC), the NWS

Weather Forecast Office (WFO) in Houston/Galveston, TX (HGX) will

correct/adjust its current fire, public, county and marine zone

configurations for the Houston Metropolitan Area (Upper and Lower

Houston Ship Channel)and Galveston Bay.  This change will improve

decision support services by reincorporating the Lower Houston

Ship Channel into marine zone GMZ335, Galveston Bay, and

graphically depicting the Upper Houston Ship Channel in the

Harris County, TX, fire and public zones TXZ213 and county area

TXC201.

 

The Lower Houston Ship Channel has always been part of marine

zone GMZ335, Galveston Bay, per NWS Instruction 10-302, Marine

and Coastal Services Areas of Responsibility. It was

inadvertently omitted during the transition from low to high

resolution shapefiles. Reincorporating the Lower Houston Ship

Channel into marine zone GMZ335 will restore a portion of the

marine zone previously in the lower resolution shapefiles.

 

In addition, the Upper Houston Ship Channel has always been part

of the land zones/county area associated with Harris County.  The 

low resolution shapefiles were not able to depict it. Graphically

depicting the Upper Houston Ship Channel in fire and public zones

TXZ213 and county area TXC201 for Harris County will improve

decision support services for the Port of Houston. The Upper Ship

Channel will not be included in marine zone GMZ335 because the

upper channel is not subject to the same sea conditions that

occur over the more open waters of the lower ship channel or

Galveston Bay.

 

The following table lists the zones/county and corresponding Zone

(Z) and County (C) Universal Geographic Codes (UGC) that will be

impacted by this change.

 

ZONE/COUNTY NAME                    UGC         Type

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

 

Galveston Bay                       GMZ335      Marine

Harris County                       TXC201      County

Harris                              TXZ213      Fire & Public

 

Updated shapefiles are available online:

 

www.nws.noaa.gov/geodata/catalog/wsom/html/marinezones.htm

 

http://www.nws.noaa.gov/geodata/catalog/wsom/html/pubzone.htm

 

http://www.nws.noaa.gov/geodata/catalog/wsom/html/firezone.htm

 

http://www.nws.noaa.gov/geodata/catalog/county/html/county.htm

 

http://www.nws.noaa.gov/geodata/catalog/wsom/html/cwa.htm

 

Graphical depictions are online at:

 

http://www.nws.noaa.gov/os/notification/images/hgxA1.jpg

 

http://www.nws.noaa.gov/os/notification/images/hgxA2.jpg

 

http://www.nws.noaa.gov/os/notification/images/hgxA3.jpg

 

For more information, please contact:

 

Brian Kyle                         Melinda Bailey

Marine Focal Point                 Public/Marine Meteorologist

National Weather Service           National Weather Service

WFO Houston/Galveston              Southern Region Headquarters

Dickinson, TX  77539               Fort Worth, TX  76102

(281)337-5074 x 229                (817)978-1100 x 107

Brian.Kyle@noaa.gov                Melinda.Bailey@noaa.gov

 

 

National Service Change Notices are online at:

 

www.weather.gov/os/notif.htm

 

$$