National Oceanic and Atmospheric Administration

Climate of 2000 - August
U.S. Regional and Statewide Analyses

Includes Year-to-Date Summary

National Climatic Data Center, 13 September 2000


Standard Regions for Temperature and Precipitation
larger image
Line separating section as of the report

Contents of This Report:

Line separating section as of the report
Through climate analysis, National Climatic Data Center scientists have identified nine climatically consistent regions within the contiguous United States which are useful for putting current climate anomalies into an historical perspective.

Additional information about current climate anomalies can be found at the respective Web Pages of the Southern Regional Climate Center, Western Regional Climate Center, Midwest Regional Climate Center, Southeast Regional Climate Center, High Plains Regional Climate Center, and the Northeast Regional Climate Center.

Line separating section as of the report

Top of Page August 2000 Statewide Ranks

August Tmp Map
Larger Map
August 2000 was the second warmest such month on record for Arkansas and Wyoming. Nine other states ranked within the top ten warm portion including
  • Nevada - 3rd warmest
  • Oklahoma - 4th warmest

A total of 26 states ranked within the warm third portion of the distribution.

Six states ranked within the cool third portion of the historical distribution for August 2000.

It was the driest August on record for Texas and Oklahoma and the 2nd driest August since 1895 for Arkansas and Kansas. Sixteen other states ranked within the dry third of the distribution.

Six states ranked within the wet third portion of the distribution.

Aug Pcp Map
Larger Map
Line separating section as of the report

Top of Page August Regional Highlights

Based upon preliminary data, August 2000 was the second warmest such month since 1895 for the South region. The last three such months have been above the long term mean. Warm Region Aug
larger image

Dry Region Aug
larger image
It was the 18th wettest August on record for the West region. August 2000 was the first August since 1991 with above normal rainfall.
August 2000 was the driest such month since 1895 for the South region. The last two such months have been much drier than normal. Wet Region Aug
larger image
Dry Region Aug
larger image
Preliminary data indicate that precipitation for the growing season-to-date, March-August 2000, averaged slightly above the long-term mean for the Primary Corn and Soybean Belt. The last six such periods have been above the long-term mean.
Line separating section as of the report

Top of Page January-August 2000 Statewide Ranks

Jan-Aug Tmp Map
Larger Map
Forty-five states ranked within the warm third portion of the historical distribution for January-August 2000 while 21 states ranked within the top ten warm. It was the warmest such year-to-date on record for Texas, New Mexico and Utah and the second warmest year-to-date for:
  • Colorado
  • Nebraska
  • Nevada
  • Wyoming

No state ranked within the cool third of the historical distribution.

January-August 2000 was the driest such period on record for Florida, third driest for Louisiana, fourth driest for Mississippi, and fifth driest for Alabama and Georgia. Twelve other states ranked within the dry third portion of the distribution.

It was the second wettest January-August on record for New York and the eighth wettest January-August on record for Massachusetts and Vermont. Fifteen other states ranked within the wet third portion of the distribution.

Jan-Aug Pcp Map
Larger Map
Line separating section as of the report

Top of Page January-August Regional Highlights

Warm Region 1-8
larger image
Preliminary data indicate that January-August 2000 was the third warmest such period since 1895 for the West-North Central region. The last three, and twelve of the last twenty, such eight-month periods have been much above the long-term mean.

Preliminary data indicate that the year-to-date, January-August 2000, was the tenth wettest such period on record for the Northeast region. Four of the last seven such periods have been much wetter than the long-term mean in this region, which experiences a great variability in precipitation. Wet Region Jan-Aug
larger image
Dry Region 1-8
larger image
Preliminary data indicate that January-August 2000 was the eighth driest such period since 1895 for the Southeast region. Only two of the last twelve such periods have been much below the long-term mean.
Top of Page
Line separating section as of the report
Current and historical drought information can be found at the U.S. Drought, Heat and Fires page. Additional drought information can also be found at the Web Page for the National Drought Mitigation Center. The Center monitors current droughts both in the United States and worldwide.

Damage due to the drought has been summarized by NOAA and the Office of Global Programs in the Climatological Impacts section of the Climate Information Project. Crop impact information can be found at the USDA NASS (National Agricultural Statistics Service) and Weekly Weather and Crop Bulletin pages. Drought statements by local National Weather Service Offices can be found at the NWS Hydrologic Information Center. Drought threat assessments and other information can be found at NOAA's Drought Information Center.

Line separating section as of the report

Top of Page August Precipitation and Temperature Ranks, Extremes and Normals

Table 1 shows precipitation and temperature ranks for each of the 9 regions and the nation for August 2000, the two-month period of July-August 2000, the six months of March-August 2000, and the past 12 months, September 1999-August 2000.
                     PRECIPITATION AND TEMPERATURE RANKS, BASED
                     ON THE PERIOD 1895-2000.  1 = DRIEST/COLDEST,
                     106 = WETTEST/WARMEST FOR AUGUST 2000,
                     106 = WETTEST/WARMEST FOR JUL-AUG 2000,
                     106 = WETTEST/WARMEST FOR MAR-AUG 2000,
                     105 = WETTEST/WARMEST FOR SEP 1999-AUG 2000.

                                AUG    JUL-AUG    MAR-AUG   SEP 1999-
            REGION              2000     2000       2000    AUG 2000
            ------              ----  ---------  ---------  ---------

                      PRECIPITATION:

           NORTHEAST             29       43         98         99
           EAST NORTH CENTRAL    44       64         74         39
           CENTRAL               42       50         51         24
 
           SOUTHEAST             26       15          7         19
           WEST NORTH CENTRAL    21       44         35         18
           SOUTH                  1        1         29          7
 
           SOUTHWEST             48       16         24          8
           NORTHWEST             27       18         25         32
           WEST                  89       63         37         44
 
           NATIONAL               3        2         22         11
 
                      TEMPERATURE:

           NORTHEAST             40        9         76         90
           EAST NORTH CENTRAL    72       52         95        100
           CENTRAL               75       41         81         99
 
           SOUTHEAST             57       53         88         79
           WEST NORTH CENTRAL   101      103        101        104
           SOUTH                105      103        102        104
 
           SOUTHWEST            101      102        105        104
           NORTHWEST             80       77         93        101
           WEST                  89       79        100        103
 
           NATIONAL*            102       95        104        104

           *National Temperature Rank Based on USHCN.

It should be emphasized that all of the temperature and precipitation ranks and values in Tables 1 through 5 are based on preliminary data. The ranks will change when the final data are processed.


Top of Page Table 2 shows historical extremes for August, the 1961-1990 normal, and the August 2000 value for each of the 9 regions and the contiguous U.S. for precipitation and temperature. It should be noted that the 2000 values will change when the final data are processed.
                                        PRECIPITATION (INCHES)
                                   DRIEST     WETTEST   NORMAL  2000
               REGION            VALUE YEAR VALUE YEAR   PCPN   PCPN
               ------            ---------- ----------  ------ ------
 
              NORTHEAST           1.78 1957  8.01 1955   3.87   3.16
              EAST NORTH CENTRAL  1.35 1930  6.27 1980   3.73   3.33
              CENTRAL             1.55 1953  6.30 1915   3.71   3.31
 
              SOUTHEAST           2.71 1930  9.78 1901   5.19   4.20
              WEST NORTH CENTRAL  0.77 1967  3.03 1968   1.71   1.25
              SOUTH               0.73 2000  6.06 1915   2.98   0.73
 
              SOUTHWEST           0.56 1962  3.25 1963   1.96   1.83
              NORTHWEST           0.10 1967  2.98 1968   0.96   0.34
              WEST                0.00 1911  2.01 1983   0.50   0.55

              NATIONAL            1.76 1929  3.55 1977   2.66   1.89*
 
                                  * PRELIMINARY VALUE, CONFIDENCE
                                    INTERVAL + OR - 0.16 INCHES
 
                                        TEMPERATURE (DEGREES F)
                                   COLDEST    WARMEST   NORMAL  2000
               REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
               ------            ---------- ----------  ------ ------
 
              NORTHEAST           62.9 1903  71.9 1937   67.4   66.8
              EAST NORTH CENTRAL  63.0 1915  74.6 1947   67.6   68.9
              CENTRAL             68.9 1915  79.8 1936   73.4   75.0
 
              SOUTHEAST           75.8 1967  81.3 1900   78.0   78.4
              WEST NORTH CENTRAL  63.0 1911  73.0 1983   67.4   70.6
              SOUTH               76.2 1992  84.5 1943   80.2   84.5
 
              SOUTHWEST           68.1 1968  74.6 1994   71.3   73.5
              NORTHWEST           59.2 1899  69.4 1967   65.2   66.4
              WEST                67.2 1899  75.7 1958   72.4   74.2

              NATIONAL*           70.0 1927  75.8 1983   72.7   74.9

              * National Temperature Values based on USHCN
 
Line separating section as of the report

Top of Page January-August Precipitation and Temperature Ranks, Extremes and Normals

Table 3 shows precipitation and temperature ranks for each of the 9 regions and the nation for January-August 2000. Based on the period 1895-2000.

1 = DRIEST/COLDEST, 106 = WETTEST/HOTTEST
               REGION                PRECIPITATION  TEMPERATURE
               ------                -------------  -----------
 
              NORTHEAST                   97             83
              EAST NORTH CENTRAL          79            101
              CENTRAL                     56             91
 
              SOUTHEAST                    8             80
              WEST NORTH CENTRAL          36            104
              SOUTH                       19            106
 
              SOUTHWEST                   25            106
              NORTHWEST                   48             96
              WEST                        77            103
 
              NATIONAL*                   23            106

              *National Temperature Rank Based on USHCN

Top of Page Table 4 shows historical extremes for January-August, the 1961-1990 normal, and the January-August 2000 value for each of the 9 regions and the contiguous U.S. for precipitation and temperature. It should be noted that the 2000 values will change when the final data are processed.
                            
                                         PRECIPITATION (INCHES)
                                   DRIEST     WETTEST   NORMAL  2000
               REGION            VALUE YEAR VALUE YEAR   PCPN   PCPN
               ------            ---------- ----------  ------ ------
 
              NORTHEAST          20.70 1965 34.09 1996  27.36  31.40
              EAST NORTH CENTRAL 13.69 1910 27.88 1993  21.10  22.59
              CENTRAL            20.02 1936 39.24 1950  29.41  30.18
 
              SOUTHEAST          26.29 1954 45.20 1991  36.37  28.64
              WEST NORTH CENTRAL  7.90 1934 18.62 1993  12.83  12.12
              SOUTH              16.93 1954 32.33 1905  24.04  20.67
 
              SOUTHWEST           6.30 1924 14.48 1941   9.20   8.15
              NORTHWEST           9.14 1924 21.79 1983  16.31  15.66
              WEST                4.76 1924 20.96 1998  10.33  12.77
 
              NATIONAL           15.92 1934 23.34 1979  20.05  19.02

                                         TEMPERATURE (DEGREES F)
                                   COLDEST    WARMEST   NORMAL  2000
               REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
               ------            ---------- ----------  ------ ------
 
              NORTHEAST           44.9 1907  50.9 1998   47.4   48.4
              EAST NORTH CENTRAL  41.3 1912  50.5 1987   45.5   48.1
              CENTRAL             51.9 1978  59.2 1921   55.0   57.1
 
              SOUTHEAST           61.8 1940  66.4 1990   63.7   65.3
              WEST NORTH CENTRAL  41.2 1950  50.0 1934   45.8   48.9
              SOUTH               61.6 1979  67.0 2000   63.9   67.0
 
              SOUTHWEST           50.2 1917  57.7 2000   53.8   57.7
              NORTHWEST           45.3 1955  53.0 1934   48.6   50.4
              WEST                54.0 1949  59.9 1934   56.6   59.2
 
              NATIONAL*           52.3 1912  57.3 2000   54.7   57.3

              * National Temperature Values based on USHCN
 
Line separating section as of the report

Top of Page Water Year River Basin Statistics, October 1999-August 2000

Table 5 shows statistics for selected river basins: Precipitation rankings are for October 1999-August 2000, where 1 = driest, and 105 = wettest, based on the period 1895 to 2000. Also shown is the areal percent of the basin experiencing severe or extreme long-term (Palmer) drought, and areal percent of the basin experiencing severe or extreme long-term (Palmer) wet conditions, as of August 2000.
                            

                                        PRECIPITATION  % AREA  % AREA
          RIVER BASIN                       RANK        DRY     WET
          -----------                   -------------  ------  ------

          MISSOURI BASIN                      8         38.9%   10.4%
          PACIFIC NORTHWEST BASIN            42         49.4%    0.0%
          CALIFORNIA RIVER BASIN             51         37.6%    0.0%
  
          GREAT BASIN                        23         52.8%    0.0%
          UPPER COLORADO BASIN                6         93.4%    0.0%
          LOWER COLORADO BASIN                5         70.0%    0.0%
          RIO GRANDE BASIN                    4         80.1%    0.0%
  
          ARKANSAS-WHITE-RED BASIN           40          0.0%    0.0%
          TEXAS GULF COAST BASIN             20         25.6%    0.0%
          SOURIS-RED-RAINY BASIN             55          0.0%   39.1%
          UPPER MISSISSIPPI BASIN            44          0.0%    0.0%
  
          LOWER MISSISSIPPI BASIN             5         46.7%    0.0%
          GREAT LAKES BASIN                  70          0.0%   13.4%
          OHIO RIVER BASIN                   54          0.0%    4.5%
          TENNESSEE RIVER BASIN              14         12.3%    0.0%
  
          NEW ENGLAND BASIN                  70          0.0%    7.7%
          MID-ATLANTIC BASIN                 79          0.0%   33.0%
          SOUTH ATLANTIC-GULF BASIN           4         64.8%    0.0%

The river basin regions are defined by the U.S. Water Resources Council.

Top of Page Line separating section as of the report For more information, refer to ...

References:

Thomas R. Karl and Albert J. Koscielny, 1982: "Drought in the United States: 1895-1981." Journal of Climatology, vol. 2, pp. 313-329.

Thomas R. Karl and Walter James Koss, 1984: "Regional and National Monthly, Seasonal, and Annual Temperature Weighted by Area, 1895-1983." Historical Climatology Series 4-3, National Climatic Data Center, Asheville, NC, 38 pp.

NOAA's National Climatic Data Center is the world's largest active archive of weather data. The preliminary temperature and precipitation rankings are available from the center by calling: 828-271-4800.

Historical precipitation and temperature ranking maps are also available on the Internet courtesy of the Climate Prediction Center.

NOAA works closely with the academic and scientific communities on climate-related research projects to increase the understanding of El Niño and improve forecasting techniques. NOAA's Climate Prediction Center monitors, analyzes and predicts climate events ranging from weeks to seasons for the nation. NOAA also operates the network of data buoys and satellites that provide vital information about the ocean waters, and initiates research projects to improve future climate forecasts. The long lead climate outlooks are available from the Climate Prediction Center.

Line separating section as of the report

For all climate questions other than questions concerning this report, please contact the National Climatic Data Center's Climate Services Division:

Climate Services Division
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4876
phone: 828-271-4800
email: ncdc.info@noaa.gov
For further information on the historical climate perspective presented in this report, contact:

William Brown
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: william.brown@noaa.gov

-or-

Jay Lawrimore
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: jay.lawrimore@noaa.gov
Top of Page