FLOOD04806

• County: Larimer
• Stream Name: Big Thompson/Cache la Poudre
• Basin: South Platte
• Title: Storm and Flood of July 31-August 1, 1976 in the Big Thompson River and Cache la Poudre River Basins
• Date: 1/1/1979
• Prepared For: Colroado Geological Survey
• Prepared By: USGS/NOAA
• Floodplain - Doc Type: Flood Documentation Report

34

FLOOD, JULY 3I-AUGUST I. 1976, BIG THOMPSON RIVER, COLORADO

1250

1150

1050

1000

50"

45"

40'

30"

no~al
319

318

25"

25"

1150

1100

95'

90'

1050

o
I

EXPLANATION

-316-

AREA WHERE DEWPOINTTEMPERATURE WAS WITHIN 6
DEGREES CELSIUS OF AIR TEMPERATURE

CONTOUR SHOWING ALTITUDE OF loO-MILlIBAR
SURFACE. -316=3160 meters. Conl(lur interval 20
meters; lO-meterinterval shown by dashed contours
Datum is mean sea le~el

L

GEOGRAPHIC CENTER OF LOWEST ALTITUDE OF
lOO-MILlIBAR SURFACE

"~'"
11 )-01

OBSERVATION STATION. -Upper left number is air
temperature, in degrees Celsius. Lowerle!t number is
depression of dewpoint temperature below air
temperature, in degrees Celsius; X shown when
depression greater than 30 degrees Celsius, Upperrighl
number is altitude of l00-millibar surface, in meters;
143:3143 melers. Lower right number is 12-hour
altitude change of JOO-millibar surface, in meters;
-01=~10 meters, Shaft indicates wind direction
Barbs on shaft indicate wind speed, in knots, Long
barb= 10 knots; shortbarb=5knots, LV in place of shaft
andbarbsindicateswindspaadswerelessthan3knots
end direction was \'ariable.M indicates missing data

-10-

LINE OF EQUAL AIR TEMPERATURE. ~nterval2 degrees
Celsius

AXIS OF PRESSURE TROUGH

H

GEOGRAPHIC CENTER OF HIGHEST ALTITUDE OF
700-MiLLlBAR SURFACE

FIGURE 29.-700-millibar analysis. 1800 MDT. July 31,1976.