National Weather Service United States Department of Commerce

Tropical Storm Colin to Impact Carolina Coast; Severe Thunderstorms in the Mid-Atlantic, Northeast, and Northern Plains

Tropical Storm Colin is producing heavy rain that may result in flash flooding, strong winds, and rough surf along and off the Carolina Coast through Sunday. Severe thunderstorms will impact parts of the Northeast, Mid-Atlantic, and northern Plains. Critical fire weather conditions expected in the Great Basin and mainland Alaska. Heavy rains are possible in central Plains and the ArkLaTex. Read More >

 

  Drought Severity Classifications

 

Ranges

Category

Description

Possible Impacts

Palmer Drought Index

CPC Soil
Moisture Model
(Percentiles)

USGS Weekly Streamflow
(Percentiles)

Standardized Precipitation Index (SPI)

Objective Short and Long-term Drought Indicator Blends (Percentiles)

D0

Abnormally
Dry

Going into drought: short-term dryness slowing planting, growth of crops or pastures. Coming out of drought: some lingering water deficits;  pastures or crops not fully recovered

-1.0 to -1.9

21-30

21-30

-0.5 to -0.7

21-30

D1

Moderate Drought

Some damage to crops, pastures; streams, reservoirs, or wells low, some water shortages developing or imminent; voluntary water-use restrictions requested

-2.0 to -2.9

11-20

11-20

-0.8 to -1.2

11-20

D2

Severe
Drought

Crop or pasture losses likely;  water shortages common; water restrictions imposed

-3.0 to -3.9

6-10

6-10

-1.3 to -1.5

6-10

D3

Extreme Drought

Major crop/pasture losses;  widespread water shortages or restrictions

-4.0 to -4.9

3-5

3-5

-1.6 to -1.9

3-5

D4

Exceptional Drought

Exceptional and widespread crop/pasture losses; shortages of water in reservoirs, streams, and wells creating water emergencies

-5.0 or less

0-2

0-2

-2.0 or less

0-2