Flood Potential Outlook
Issued by NWS Houston/Galveston, TX

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000
FGUS74 KHGX 191732
ESFHGX
200532-
PROBABILISTIC HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON, TX
1232 PM CDT THU MAR 19 2015

...Advanced Hydrologic Prediction Service (AHPS) long range
probabilistic outlook for Harris County watersheds in southeast Texas...

The Houston/Galveston National Weather Service Office has
implemented Advanced Hydrologic Prediction Service (AHPS) for Harris
County watersheds in southeast Texas. AHPS enables the National Weather
Service to provide long-range probabilistic outlooks. This service is
also available on the internet.

In the table below...The 90 through 10 percent columns indicate the
chance the river could rise above the listed stage levels in the
next 90 days. Example: Greens Bayou at U.S.Hwy 59 in Houston has a flood
stage of 55 feet. There is a 50 percent chance the U.S. Hwy 59 forecast
point will rise above 48.5 feet during the next 90 days.

 Chance of exceeding stages at specific locations
             Valid [3/18/2015 - 6/16/2015]

Location FS(ft) 90% 80% 70% 60% 50% 40% 30% 20% 10%
------------------------------------------------------------------
Spring Creek
 Tomball 165.2  145.8 146.5 147.0 147.3 147.9 148.6 149.8 150.9 152.7
Cypress Creek
 Katy-Hockley 157.3  150.4 151.3 152.4 152.9 153.4 154.4 157.4 158.7 160.1
 Grant Road 36.7  106.3 108.0 109.5 110.4 111.1 112.1 117.0 121.1 122.9
Greens Bayou
 Knobcrest St 84.8  72.1 72.4 72.6 73.7 74.2 75.0 75.4 77.9 79.8
 U.S. Hwy 59 55.0  45.3 46.2 47.3 47.8 48.5 49.4 50.1 52.2 54.4
 Ley Road 30.0  17.1 18.2 20.6 22.7 23.8 27.0 30.2 34.0 36.3
White Oak Bayou
 Heights Blvd 32.0   9.6 10.8 13.0 17.0 20.1 23.0 25.9 34.8 38.3
Brays Bayou
 Main Street 56.0  18.1 19.3 22.4 25.3 26.5 29.9 31.7 35.1 41.0
Buffalo Bayou
 West Belt 71.0   6.4 42.4 42.4 42.4 42.8 43.6 44.9 46.3 48.6
 Piney Point 52.0  34.1 34.1 34.2 35.0 35.8 36.8 38.4 39.8 48.8
 Shepherd Dr 28.0   6.1  6.8  9.7 11.5 12.8 15.9 19.3 23.2 32.8

This long-range probabilistic outlook contains numbers that are
calculated using multiple scenarios from 50 years of historical
climatological and stream flow data. These numbers also take
into account current conditions of the river and soil moisture.
by providing the complete range of probabilistic numbers...The
level of risk associated with long-range planning decisions can
be determined.

Additional supportive data and explanation are available on the
internet at: www.srh.weather.gov/cgi-bin/ahps.cgi!hgx
(internet address is all lower case).

long-range probabilistic outlooks are issued around the third
Thursday of every month.
$$




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