Illinois Drought: Update September 21, 2005, Illinois State Water Survey

Illinois Drought

Widespread rains fell across Illinois this week, leading to a state-wide average of 1.58 inches, which is about double the expected amount for this week in September (table 1). The heaviest amounts were reported in central and southern Illinois with 1-3 inches common. The rains were lighter in the core of the drought region across northern Illinois. Even with the recent rains, this is the 6th driest March 1 to September 21 period since 1900 (table 2).
Table 1.                        Illinois 
                         9/15/2005 to  9/21/2005
 
Climate          <------Temperature----->   <---------Precipitation--------->
Division         Actual   Normal      Dev   Actual   Normal     Dev   Percent
-----------------------------------------------------------------------------
Northwest          65.4     62.0      3.4     0.65     0.82    -0.17       79
Northeast          65.6     62.5      3.1     0.92     0.85     0.07      108
West               67.6     64.5      3.1     1.44     0.87     0.57      166
Central            67.2     64.5      2.7     1.40     0.80     0.60      174
East               66.4     64.4      2.0     1.64     0.67     0.97      245
West-southwest     68.2     65.9      2.4     1.92     0.75     1.17      256
East-southeast     69.2     66.3      2.9     1.66     0.65     1.01      254
Southwest          69.5     67.0      2.5     2.95     0.82     2.13      358
Southeast          69.6     67.5      2.2     2.02     0.77     1.25      261
 
State              67.6     64.8      2.7     1.58     0.78     0.80      204
Dev means Deviation From Normal, Percent means Percent of Normal A map of climate divisions can be found at http://www.sws.uiuc.edu/atmos/statecli/images/ilcldi1.gif
Table 2.  Illinois State-Wide Precipitation Ranking - 3/1/2005 to 9/21/2005
 
      End  |<------- Precipitation ------->|<----- Temperature ---->|
Rank  Year    Actual   Deviation   Percent       Actual   Deviation
  1   1930    14.79    -10.26        59           65.2      1.8
  2   1988    14.88    -10.17        59           65.0      1.5
  3   1936    15.45     -9.60        62           67.3      3.8
  4   1901    16.31     -8.74        65           64.2      0.7
  5   1914    17.56     -7.49        70           65.1      1.7
  6   2005*   17.86     -7.19        71           64.6      1.2
  7   1940    18.08     -6.97        72           63.1     -0.4
  8   1971    18.17     -6.88        73           63.0     -0.5
  9   1906    19.73     -5.32        79           63.2     -0.2
 10   1976    19.89     -5.16        79           63.5      0.0
 
Illinois Drought

Illinois State Water Survey

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