Drought Level

PDI

CMI

Precipitation

Ground Water

Stream Flow

Surface Water Reservoirs

Normal

-1.0 to
-1.99

0.0 to -1.0
Slightly dry

1 month below normal

1 month below normal

2 consec. months below normal

Reservoir levels at or near normal for the time of year

Advisory

-2.0 to
3.99

-1.0 to -1.9 Abnormally dry

2 month cumulative below 65%  of normal

At least 2 out of 3 months below normal

3 consec. months below normal

Small index Reservoirs below normal

Watch

-3.0 to 3.99

-2.0 to -2.9
Excessively dry

1 of the following criteria met:
3 month cum. <65% or
6 months cum <70% or
12 months cum. <70%

4-5 consecutive moths below normal

At least 4 out of 5 consec. months below normal

Medium index Reservoir normal

Warning

-4.0 and below

>-2.9
Severely dry

2 out 3 of the above criteria met:
3 months cum. <65% and
6 months cum <65% and
12 months cum. <65%
or
3 months cum. <65% and
12 months cum <65%

6-7 consecutive months below normal

At least 6 out of l7 consec. months below normal

Large index reservoir below normal

Emergency

-4.0 and below

>-2.9
Severely dry

Same criteria as Warning
and
Previous month was Warning Emergency

7 months below normal observation wells recording monthly record lows

>7 months below normal

Cont. of previous month’s conditions