|
|
|
Climate of 2002 - May U.S. Regional Drought Watch National Climatic Data Center, 17 June 2002 |
|
|
|
|
|
May was very dry across much of the western U.S. and adjoining Great Plains, the Gulf Coast, and parts of the mid-Atlantic states. Near-normal precipitation fell across part of the Pacific Northwest, mainly Washington and the extreme northern Rockies.
Beneficial rains continued for a third month bringing drought relief to a good part of the Northeast.
May was wet at the primary stations in Hawaii, dry at many stations in Puerto Rico, and showed a mixed pattern across Alaska.
These overall conditions are evident in the following indicators:
Two other drought-related monitoring tools are the Vegetation Health Index and the Keetch-Byram Drought Index:
|
Western U.S. Drought
|
While beneficial rain and snow fell across part of the Pacific Northwest, mainly Washington and the extreme northern Rockies, short-term drought characterized the conditions across much of the western U.S. during May. Water year (October 2001-present) precipitation totals were above average in the northwest, but totals dropped precipitously toward the Rockies and the Southwest. Snowpacks were essentially melted for this water year except for the higher elevations of the northern Rockies, northern Cascades, and Canada.
A detailed discussion of drought conditions in the western U.S. can be found for the following regions:
Dry conditions in the western U.S. stretched from the Canadian border to the Mexican border. As illustrated in the North America vegetation health index map to the right below, the drought did not stop at the borders. According to news reports (Reuters), |
|
![]() |
| The drought in the western U.S. extended into the adjoining portions of the Great Plains. The precipitation deficits across this entire region, stretching from the High Plains to the West Coast, have ranked in the top ten driest category (out of 107-108 years) for all seasons from May back to June-May (see table below). The deficits have persisted, in some cases, for three years (see table, and top graph below right). This region experienced a rapid intensification of the Palmer Hydrological Drought Index (PHDI) in 2000 (see bottom graph below right), which was compounded by numerous wildfires that summer. The regional PHDI has reached levels this May comparable to those of summer 2000. |
|
![]() ![]() |
Central U.S. Drought
| May 2002 was unusually dry across much of the central U.S., from the High Plains of Montana and the Dakotas to southern Texas. This month was a continuation of dryness which extended back for a year or longer for some of these areas. |
| The West North Central region, which consists of the western states Montana and Wyoming and the Great Plains states North and South Dakota and Nebraska, has had six consecutive months of near to below-normal precipitation (see top graph below). Dryness during most of the last ten months has given the region a rank of second driest August-May (see bottom graph below). |
|
![]() ![]() |
Some Montana drought impacts:
|
May marked the second consecutive dry month, regionwide, for the South region. There has been considerable variability within this region, with the western and southern portions of the South region being hardest hit by drought (see map to right for short-term soil moisture conditions). Some drought impacts:
|
![]() |
|
![]() ![]() |
Eastern U.S. Drought| May marked the third consecutive wet month across much of the Northeast region, bringing drought relief to much of the area. However, long-term deficits remain, with June 2001-May 2002 ranking as the 21st driest June-May on record. In the Southeast, this was the second consecutive month with dry conditions averaged across the region. May dryness was especially acute across the Gulf coast and in North Carolina. |
|
![]() ![]() |
Additional Contacts:
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. Additional drought information can be found at the National Drought Mitigation Center, the USDA's National Agricultural Library, the interim National Drought Council, and the NOAA Paleoclimatology Program. The following states have set up web pages detailing current drought conditions and/or their plans to handle drought emergencies:
For additional information on current and past wildfire seasons please see the National Interagency Fire Center web site or the U.S. Forest Service Fire and Aviation web site. NCDC's Drought Recovery Page shows the precipitation required to end or ameliorate droughts and the probability of receiving the required precipitation. Additional climate monitoring graphics can be found at the Climate Prediction Center's monitoring pages:
Drought conditions on the Canadian prairies can be found at the Agriculture and Agri-Food Canada Drought Watch page. |
For all climate questions other than questions concerning this report, please contact the National Climatic Data Center's Climate Services Division:
Climate Services DivisionFor further information on the historical climate perspective presented in this report, contact:
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
Richard Heim-or-
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: Richard.Heim@noaa.gov
Jay Lawrimore
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: Jay.Lawrimore@noaa.gov
NCDC / Climate Monitoring / Climate of 2002 / May / Search / Help