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National Oceanic and Atmospheric Administration

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

Includes Year-to-Date Summary

National Climatic Data Center, 14 July 2000

Standard Regions for Temperature and Precipitation
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Contents of This Report:

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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.

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Top of Page June 2000 Statewide Ranks

June Tmp Map
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Seventeen states ranked within the warm-third portion of the historical distribution for June 2000 while only Nevada ranked within the top ten warm with the third warmest June since 1895.

Eight states, all in the Mississippi Valley and South Region, ranked within the cool-third of the historical distribution.

It was the 18th driest June on record for Idaho. Six other states ranked within the dry third of the distribution.

It was the fifth wettest June on record for Oklahoma and the sixth wettest June since 1895 for New Mexico. Twenty-three other states ranked within the wet third portion of the distribution.

June Pcp Map
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Top of Page June Regional Highlights

Based upon preliminary data, June 2000 was the eighth warmest such month since 1895 for the West Region. Warm Region June
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Cool Region June
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Preliminary data indicate that June 2000 was the 30th coolest such month since 1895 for the South Region.

It was the 11th wettest June on record for the South Region. A combination of abundant cloud cover and precipitation allowed the region to be not only wetter than normal, but cooler than normal as well (see above graphic). Three of the last four such months have been wetter than the long-term mean. Wet Region June
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Dry Region June
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Preliminary data indicate that June 2000 was the 30th driest such month since 1895 for the West-North Central Region.
Preliminary data indicate that precipitation for the growing season-to-date, March-June 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. Ag. Belt Pcp March-June
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Top of Page January-June 2000 Statewide Ranks

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

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

January-June 2000 was the third driest such period on record for Florida. Nine other states ranked within the dry-third portion of the distribution.

It was the second wettest January-June on record for New York and the seventh wettest January-June on record for Vermont. Seventeen other states ranked within the wet-third portion of the distribution.

Jan-June Pcp Map
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Top of Page January-June Regional Highlights

Preliminary data indicate that the year-to-date, January-June 2000, was the warmest such period on record for the Southwest Region. The last 16 such six-month periods have been at to much above the long-term mean. Warm Region Jan-June
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Warm Region 1-6
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Preliminary data indicate that January-June 2000 was the second warmest such period since 1895 for the South Region. The last three such six-month periods have been much above the long-term mean.

Preliminary data indicate that the year-to-date, January-June 2000, was the tenth wettest such period on record for the Northeast Region. Wet Region Jan-June
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Dry Region 1-6
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Preliminary data indicate that January-June 2000 was the 14th 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.
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Top of Page Regional Drought Watch - June

The Palmer Z Index shows how monthly moisture conditions depart from normal (short-term drought and wetness). The June 2000 pattern shows areas of extremely dry conditions located in the northern Rockies, southwestward to the Great Basin and eastward to the panhandle of Nebraska. Additional moisture deficits were also noted in the Piedmont of the Carolinas, central and western Georgia, east-central Alabama, most of Florida, and a good portion of the Southwest. Unusually wet conditions were centered over the southern Plains, mid-Mississippi Valley, western and central Great Lakes states and portions of the Northeast.
U.S. Animated Z
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The animated maps show the geographical pattern of the moisture anomalies for the last 12 months. On these maps, the red shading denotes dry conditions while the green shading indicates wet conditions.

The Palmer Drought Index maps show long-term (cumulative) drought and wet spell conditions. By the end of June 2000, long-term drought continued across parts of the inter-mountain West and most of the Southeast from South Carolina to central Texas. Patchy long-term wet conditions were found in New England and areas in the northern and southern Plains.
U.S. Animated PDI
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The animated maps show how the geographical pattern of the long-term moisture conditions has changed over the last 12 months. On these maps, the red shading denotes drought conditions while the green shading indicates wet conditions.

The Palmer Crop Moisture Index is computed on a weekly basis by the National Weather Service's Climate Prediction Center and is useful for following the impact of precipitation anomalies on agriculture. The animated Crop Moisture Index maps show the weekly change in topsoil moisture conditions for 2000 from March 4th through July 1st, the growing season to date.
U.S. Animated CMI
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The animated maps show how the geographical pattern of the long-term moisture conditions has changed over the last four months. On these maps, the red shading denotes dry conditions while the green shading indicates wet conditions.
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Top of Page Southeast Region Precipitation Deficit

Dry conditions persisted across much of the southeastern United States. June 2000 was drier than normal for the Southeast Region, marking the eighth consecutive month with precipitation near to much below normal. This eight-month period (November 1999-June 2000) ranked as the ninth driest November-June period since 1895. Other ranks for consecutive months ending in June 2000 include: seventh driest May-June, eighth driest February-June, and ninth driest December-June. Southeast Pcp Dep
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The Palmer Drought Index (PDI) has been used for U.S. drought monitoring for the last 30 years. It is based on a water budget model that incorporates the balance between water supply (i.e., precipitation), soil moisture, runoff, and water demand (computed from estimates for evaporation and transpiration). The PDI is a long-term drought index which incorporates the current conditions (i.e., for the current month) and the past conditions (the preceding several months). The PDI is useful for showing how the current drought compares to past droughts.

Southeast PDI
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Unusually wet conditions occurred in the Southeast for much of 1994-1997. The wetness abruptly ended in mid-1998, with moderate to severe drought rapidly developing by the end of that year. With a minor interruption during the end of 1999, severe drought has persisted across this region for about the last two years. The present drought situation is comparable, in both magnitude and duration, to the droughts of the 1980's and 1990's. However, other droughts, especially those of the 1920's, 1930's, and 1950's, lasted longer and were more severe.

Top of PageThe Drought In Hawaii

Persistent but weaker than normal trade winds brought ample rain showers to the windward areas of the Hawaiian Islands during June 2000, which helped ease the drought situation in some areas. However, rainfall totals for the year-to-date remained below normal across the islands, with most rain gauges ranging from 20 to 70 percent of normal. Severe to extreme drought continued in many parts of Hawaii. At the Honolulu International Airport, for example, only four months since January 1997 have seen above-normal rainfall. The last ten years have been especially dry. Nine of the last ten July-June periods have had much below-normal rainfall, with the last three (July 1997-June 1998, July 1998-June 1999, and July 1999-June 2000) ranking at or near record dry levels. Additional details can be found at the web page of the National Weather Service Hawaii office.

Honolulu Pcp, 1/97-6/00
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Honolulu Pcp, July-June
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Current and historical drought information can 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.

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

Table 1 shows precipitation and temperature ranks for each of the 9 regions and the nation for June 2000, the two-month period of May-June 2000, the six months of January-June 2000, and the past 12 months, July 1999-June 2000.
             PRECIPITATION AND TEMPERATURE RANKS, BASED
             ON THE PERIOD 1895-2000.  1 = DRIEST/COLDEST,
             106 = WETTEST/WARMEST FOR JUNE 2000,
             106 = WETTEST/WARMEST FOR MAY-JUNE 2000,
             106 = WETTEST/WARMEST FOR JAN-JUNE 2000,
             105 = WETTEST/WARMEST FOR JULY 1999-JUNE 2000.

                        JUNE   MAY-JUNE   JAN-JUNE  JULY 1999-
    REGION              2000     2000       2000    JUNE 2000
    ------              ----  ---------  ---------  ---------

              PRECIPITATION:

   NORTHEAST             84       92         98         96
   EAST NORTH CENTRAL    84       92         70         47
   CENTRAL               90       73         52         13

   SOUTHEAST             44        7         14         13
   WEST NORTH CENTRAL    30       36         45         26
   SOUTH                 96       70         46         12

   SOUTHWEST             84       48         45         47
   NORTHWEST             36       53         58         39
   WEST                  51       52         79         42

   NATIONAL              93       62         44         16

              TEMPERATURE:

   NORTHEAST             51       70         93         99
   EAST NORTH CENTRAL    31       66        102        102
   CENTRAL               39       75         96        101

   SOUTHEAST             67       91         80         91
   WEST NORTH CENTRAL    58       75        100        104
   SOUTH                 30       88        105        102

   SOUTHWEST             83      104        106        104
   NORTHWEST             85       85         97        100
   WEST                  99      105        104        102

   NATIONAL              73      102        106        105

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.


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Table 2 shows historical extremes for June, the 1961-1990 normal, and the June 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           1.60 1988  8.53 1972   3.84   4.43
      EAST NORTH CENTRAL  1.41 1910  6.68 1967   3.89   4.98
      CENTRAL             1.03 1988  9.10 1928   3.95   5.43

      SOUTHEAST           2.20 1931  8.37 1900   4.86   4.44
      WEST NORTH CENTRAL  1.25 1933  5.27 1947   2.73   2.35
      SOUTH               0.98 1933  6.85 1989   3.66   5.27

      SOUTHWEST           0.16 1916  1.93 1927   0.93   1.23
      NORTHWEST           0.32 1919  3.02 1947   1.48   1.13
      WEST                0.01 1935  1.14 1963   0.46   0.31

      NATIONAL            1.43 1933  4.19 1928   2.84   3.33*

                          * PRELIMINARY VALUE, CONFIDENCE
                            INTERVAL + OR - 0.25 INCHES

                             TEMPERATURE (DEGREES F)
                           COLDEST    WARMEST   NORMAL  2000
       REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
       ------            ---------- ----------  ------ ------

      NORTHEAST           60.3 1958  68.6 1943   64.4   64.8
      EAST NORTH CENTRAL  59.5 1969  72.4 1933   65.3   64.0
      CENTRAL             66.2 1903  77.6 1952   71.3   71.0

      SOUTHEAST           73.0 1955  80.8 1952   75.8   77.1
      WEST NORTH CENTRAL  56.7 1951  71.6 1988   63.2   62.4
      SOUTH               72.1 1903  83.8 1953   77.6   77.0

      SOUTHWEST           63.4 1907  72.8 1994   68.1   69.8
      NORTHWEST           54.9 1953  64.8 1918   59.9   61.1
      WEST                62.2 1944  74.0 1918   67.7   71.1

      NATIONAL*           66.5 1903  72.4 1933   69.3   70.0

                              * National Temperature Values based
                                on USHCN

 
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Top of Page January-June 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-June 2000. Based on the period 1895-2000.
         1 = DRIEST/COLDEST, 106 = WETTEST/HOTTEST.

       REGION                PRECIPITATION  TEMPERATURE
       ------                -------------  -----------

      NORTHEAST                   98             93
      EAST NORTH CENTRAL          70            102
      CENTRAL                     52             96

      SOUTHEAST                   14             80
      WEST NORTH CENTRAL          45            100
      SOUTH                       46            105

      SOUTHWEST                   45            106
      NORTHWEST                   58             97
      WEST                        79            104

      NATIONAL                    44            106


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Table 4 shows historical extremes for January-June, the 1961-1990 normal, and the January-June 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          13.83 1941 26.76 1998  19.68  23.54
      EAST NORTH CENTRAL  8.07 1988 18.00 1908  13.76  14.91
      CENTRAL            14.17 1988 29.56 1950  21.45  21.95

      SOUTHEAST          15.72 1898 32.59 1929  25.62  19.65
      WEST NORTH CENTRAL  5.82 1934 12.17 1944   9.10   8.73
      SOUTH              11.62 1925 26.73 1957  18.03  17.48

      SOUTHWEST           3.20 1972 10.94 1905   5.41   5.27
      NORTHWEST           8.06 1924 19.94 1953  14.62  14.95
      WEST                4.55 1924 20.40 1998   9.49  12.14

      NATIONAL           11.12 1988 17.87 1998  14.65  14.54

                             TEMPERATURE (DEGREES F)
                           COLDEST    WARMEST   NORMAL  2000
       REGION            VALUE YEAR VALUE YEAR   TEMP   TEMP
       ------            ---------- ----------  ------ ------

      NORTHEAST           37.4 1907  44.8 1998   40.4   42.4
      EAST NORTH CENTRAL  32.7 1912  44.0 1987   37.6   41.4
      CENTRAL             44.3 1978  53.4 1921   48.5   51.3

      SOUTHEAST           56.4 1978  62.1 1949   58.8   60.8
      WEST NORTH CENTRAL  32.9 1917  43.3 1987   38.3   41.8
      SOUTH               55.5 1979  62.2 1911   58.3   61.6

      SOUTHWEST           43.2 1917  51.8 2000   47.6   51.8
      NORTHWEST           39.1 1955  48.5 1934   43.0   45.1
      WEST                47.4 1933  55.1 1934   51.1   54.4

      NATIONAL*           45.5 1917  51.6 2000   48.4   51.6

                         * National Temperature Values based
                           on USHCN

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

Table 5 shows statistics for selected river basins: Precipitation rankings are for October 1999-June 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 June 2000.

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

  MISSOURI BASIN                     14         16.9%   11.9%
  PACIFIC NORTHWEST BASIN            48         12.2%    0.0%
  CALIFORNIA RIVER BASIN             51         28.8%    0.0%

  GREAT BASIN                        21         34.5%    0.0%
  UPPER COLORADO BASIN                7         23.6%    0.0%
  LOWER COLORADO BASIN                4         51.7%    0.0%
  RIO GRANDE BASIN                   17         17.9%    0.0%

  ARKANSAS-WHITE-RED BASIN           56          0.0%    3.7%
  TEXAS GULF COAST BASIN             31          9.3%    0.0%
  SOURIS-RED-RAINY BASIN             26          0.0%   22.8%
  UPPER MISSISSIPPI BASIN            36          0.0%    0.0%

  LOWER MISSISSIPPI BASIN            14         27.1%    0.0%
  GREAT LAKES BASIN                  68          0.0%    0.0%
  OHIO RIVER BASIN                   41          0.4%    0.0%
  TENNESSEE RIVER BASIN              18          0.0%    0.0%

  NEW ENGLAND BASIN                  71          0.0%    7.7%
  MID-ATLANTIC BASIN                 73          0.0%   10.3%
  SOUTH ATLANTIC-GULF BASIN           9         37.4%    0.0%

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

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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.

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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.orders@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
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