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

14

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

1100

1050

1000

95"

B5"

BO"

50"

45"

40"

35"

35"

3D"

25"

318~
1~~6 13
~o:il

318

25"

1150

1100

1050

100"
500 MILES
I

95"

90"

o
I

EXPLANATION

-316-

AREA WHERE DEWPOINTTEMPERAIUREWAS WITHIN 6
OEGREES CELSIUS OF AlA TEMPERATURE

CONTOUR SHOWING ALTITUDE OF lOO-MILlIBAR
SURFACE.-316=3160 meters. Contour interval 20
meters: 10-melerinterval shown by dashed corltours.
Datum is mean sea level

l

GEOGRAPHIC CENTER OF LOWEST ALTITUDE OF
JOo.MILLlBAR SURFACE

10~_143
11 )-0'

OBSERVATION STATlON.---Upper left number is air
temperature, in degrees Celsius. Lower left number is
depression of dewpoint temperature below air
temperature. in degrees Celsius; X shown when
depressiongreaterthan30degrees Celsius. Upperrighl
number is altitude of JOO-millibar surface, in meters;
143"'3143 meters. Lower right number is 12.hour
altitude change of 700-miliibar surface, in meters;
-01:-10 meters. Shaft indicates wind direction.
Barbs on shaft indicate wind speed, in knots. Long
barb:10knots: shortbarb:5knots. LVinplaceofshaft
and barbs indicates wind speeds were less than 3 knots
and direction was variable.M indicates missing data

-10-

LINE OF EQUAL AIR TEMPERATURE. -Interval 2 degrees
Celsius

AXIS OF PRESSURE TROUGH

H

GEOGRAPHIC CENTER OF HIGHEST ALTITUOE OF
700.MILlIBAR SUR"ACE

FIGURE 9.-700-millibar analysis, 0600 MDT, July 31,1976.