Storm Prediction Center Non-Operational Watch Probability Tables

Tornado Watch 833


The weather watch probability tables are a non-operational product currently under
evaluation at the Storm Prediction Center.  For each watch, probabilities for particular
events inside the watch (listed below in each table) are determined by the issuing
forecaster. The "Low" category contains probability values ranging from 0-20%, "Moderate"
from 30-60%, and "High" from 70-100%. 
High values are bolded and lighter in color to
provide awareness of an increased threat for a particular event.   You may provide
feedback on this non-operational product by writing an e-mail to

Probability of 2 or more tornadoes

High (80%)

Probability of 1 or more strong (F2-F5) tornadoes

Low (20%)

Probability of 10 or more severe wind events

Mod (30%)

Probability of 1 or more wind events > 65 knots

Low (0%)

Probability of 10 or more severe hail events

Low (0%)

Probability of 1 or more hailstones > 2 inches

Low (0%)