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HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
842 AM CDT FRI AUG 27 2004
...WEST CENTRAL TEXAS IS EXPERIENCING NORMAL AGRICULTURAL AND
HYDROLOGICAL CONDITIONS...
SYNOPSIS...
WEST CENTRAL TEXAS CONTINUES TO EXPERIENCE A WEST TO NORTHWEST FLOW
PATTERN WITH PERIODIC CHANCES FOR RAIN. OVER THE LAST SEVERAL
WEEKS...MUCH OF THE AREA RECEIVED BENEFICIAL RAINS WITH ISOLATED
FLASH FLOODING OCCURRING OVER THE HEARTLAND...BIG COUNTRY AND CONCHO
VALLEY. OVER A FOUR DAY PERIOD...AUGUST 19 THROUGH 22...AREAS IN
CALLAHAN...BROWN...SAN SABA...COLEMAN AND MCCULLOCH COUNTIES RECEIVED
OVER 5 INCHES OF RAIN. AS MUCH AS 7 INCHES WAS REPORTED IN SOUTHERN
CALLAHAN COUNTY...WHILE CENTRAL SAN SABA COUNTY REPORTED OVER 6
INCHES OF RAIN.
THE U.S. DROUGHT MONITOR...ISSUED THROUGH THE NATIONAL DROUGHT
MITIGATION CENTER ON AUGUST 24...INDICATES THAT WEST CENTRAL TEXAS IS
EXPERIENCING NORMAL HYDROLOGICAL AND AGRICULTURAL CONDITIONS.
FROM AUGUST 1 THROUGH 26...THE SAN ANGELO REGIONAL AIRPORT RECEIVED
1.47 INCHES OF RAIN. THE NORMAL RAINFALL FOR SAN ANGELO IN AUGUST IS
2.05 INCHES. FOR THE PERIOD JANUARY THROUGH JULY...SAN ANGELO
RECEIVED 13.39 INCHES OF RAIN. THE AVERAGE RAINFALL FOR SAN ANGELO
FOR THE PERIOD JANUARY THROUGH JULY IS 11.30 INCHES.
FROM AUGUST 1 THROUGH 26...THE ABILENE REGIONAL AIRPORT RECEIVED 4.66
INCHES OF RAIN. THE NORMAL RAINFALL FOR ABILENE IN AUGUST IS 2.63
INCHES. FOR THE PERIOD JANUARY THROUGH JULY...ABILENE RECEIVED 18.19
INCHES OF RAIN. THE AVERAGE RAINFALL FOR ABILENE FOR THE PERIOD
JANUARY THROUGH JULY IS 12.77 INCHES.
HYDROLOGIC IMPACTS...
THE AUGUST 19 THROUGH 22 STORMS PRODUCED HEAVY RAINFALL IN THE
HEARTLAND THAT GENERATED CONSIDERABLE RUNOFF IN THE COLORADO
RIVER...SAN SABA RIVER AND PECAN BAYOU WATERSHEDS. MINOR RUNOFF WAS
NOTED ACROSS THE REMAINDER OF WEST CENTRAL TEXAS. THE USGS
WATERWATCH INDICATES THAT PORTIONS OF THE CLEAR FORK OF THE BRAZOS
RIVER AND SOUTH CONCHO RIVER ARE REPORTING BELOW NORMAL STREAMFLOW
COMPARED TO HISTORICAL CONDITIONS. WITH THE EXCEPTION OF LAKE
BROWNWOOD...MOST OF THE RESERVOIRS LOCATED ACROSS WEST CENTRAL TEXAS
ARE WELL BELOW THEIR CONSERVATION CAPACITY. DURING THE LAST STORM
EVENT...LAKE BROWNWOOD FILLED AND WATER CLIMBED AS HIGH AS 1.3 FEET
ABOVE THE EMERGENCY SPILLWAY. OTHER NOTABLE RESERVOIR INCREASES OVER
THE LAST STORM EVENT INCLUDE FORT PHANTOM HILL WHICH ROSE ALMOST 3
FEET AND HORDS CREEK LAKE INCREASED BY 3 FEET. IVIE RESERVOIR
INCREASED BY ONLY 0.2 OF A FOOT AND SPENCE RESERVOIR INCREASED BY 0.3
OF A FOOT. FISHER AND TWIN BUTTES RESERVOIRS RECEIVED LITTLE RUNOFF.
THESE SUMMER MONTHS CONTINUE TO TAKE A TOLL ON THE WEST TEXAS
RESERVOIRS AS THEY DRY OUT DUE TO EVAPORATION AND MUNICIPAL WATER
USE. THE WATER LEVEL IN TWIN BUTTES RESERVOIR REMAINS BELOW THE USGS
DATA COLLECTION EQUIPMENT THAT PROVIDES READINGS OF THE POOL
ELEVATION.
RESERVOIR CONDITIONS AS OF AUGUST 25...
/ CURRENT CONSERVATION CURRENT %
/ ELEVATION CAPACITY CAPACITY CONSERVATION
RESERVOIR (FT) (AC-FT) (AC-FT) CAPACITY
FORT PHANTOM HILL 1625.81 70036 37590 54
LAKE STAMFORD 1412.20 51570 31700 61
HUBBARD CREEK 1165.70 318070 125750 40
HORDS CREEK LAKE 1887.52 8800 3470 39
LAKE BROWNWOOD 1425.00 131428 131428 100
E.V. SPENCE 1838.33 517272 36980 7
TWIN BUTTES BELOW EQUIPMENT
O.C. FISHER 1855.60 119200 1760 1
O.H. IVIE 1523.06 554340 173190 31
FIRE DANGER IMPACTS...
CURRENTLY ACROSS WEST CENTRAL TEXAS...CONCHO...COKE...MENARD AND
TAYLOR COUNTIES HAVE AN ESTABLISHED COUNTY WIDE BURN BAN. TO ASSESS
FIRE POTENTIAL...THE TEXAS FOREST SERVICE USES THE KEETCH-BYRAM
DROUGHT INDEX...WHICH IS A NUMERICAL INDEX CALCULATED DAILY FOR EACH
COUNTY. EACH NUMBER IS AN ESTIMATE OF THE AMOUNT OF
PRECIPITATION...IN HUNDREDTHS OF AN INCH...NEEDED TO BRING THE SOIL
BACK TO SATURATION. THE INDEX RANGES FROM 0 TO 800...WITH 0
REPRESENTING A SATURATED SOIL AND 800 A COMPLETELY DRY SOIL. AS OF
AUGUST 26...THE KEETCH-BYRAM DROUGHT INDEX SHOWS THAT THE FIRE
POTENTIAL ACROSS MUCH OF WEST CENTRAL TEXAS IS LOW AND FALLS WITHIN
THE 0 TO 400 RANGE. THE RECENT RAINS HAVE HELPED TO REDUCE THE FIRE
POTENTIAL ACROSS WEST CENTRAL TEXAS.
AGRICULTURAL IMPACTS...
THE CROP MOISTURE INDEX MONITORS SHORT TERM MOISTURE CONDITIONS
ACROSS MAJOR CROP PRODUCING REGIONS. THE INDEX IS NOT USED FOR
MONITORING EXTENDED DROUGHT CONDITIONS. THE CROP MOISTURE INDEX
ISSUED BY THE CLIMATE PREDICTION CENTER ON AUGUST 21...INDICATES THAT
SHORT TERM CONDITIONS ARE ABNORMALLY MOIST TO WET OVER PORTIONS OF
THE BIG COUNTRY...NORTHERN HEARTLAND AND NORTHEASTERN PORTIONS OF THE
CONCHO VALLEY. THE REMAINDER OF WEST CENTRAL TEXAS IS DEPICTED AS
EXPERIENCING NEAR NORMAL CONDITIONS.
OUTLOOK...
THE CLIMATE PREDICTION CENTER OUTLOOK INDICATES THAT WEST CENTRAL
TEXAS HAS AN EQUAL CHANCE OF ABOVE NORMAL...NORMAL...OR BELOW NORMAL
PRECIPITATION AND TEMPERATURE FOR SEPTEMBER...OCTOBER AND NOVEMBER.
KEEP UP TO DATE ON THE LATEST DROUGHT INFORMATION AT THE FOLLOWING
WEBSITES...
www.srh.noaa.gov/srh/ssd/html/drought.htm
www.drought.noaa.gov
www.texasweatherinfo.net/monitoring/meteorological/drought/index.htm
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