Mouse over on the product on the left side
to see the criteria for issuance
Tornado Warning
Criteria:
Tornado Warning:
Tornadoes sighted or indicated on radar
Tornado Emergency:
In exceedingly rare situations, when a severe threat to human life and catastrophic damage from a tornado is imminent or ongoing.
Severe Thunderstorm Warning
Criteria:
Wind gusts of 58 MPH or greater
...or...
Hail of 1.00" in diameter or greater
Special Weather Statement
Criteria:
Wind gusts of 40 MPH to 57 MPH
...or...
Hail of 0.50" to 0.99" in diameter
The Special Weather Statement (SPS) is also used
for other types of significant weather, usually
when falling below warning or advisory criteria.
Flash Flood Warning
Criteria:
Flash Flood Warning:
Flooding observed or indicated by radar...
...in rapidly changing, short-term situations
Flash Flood Emergency:
In exceedingly rare situations, when a severe threat to human life and catastrophic damage from a flash flood is imminent or ongoing.
Flood Warning
Criteria:
Flooding observed or indicated by radar...
...in long-term situations
River flood warnings are issued when forecast crests at specific river forecast points are expected to reach/exceed flood stage.
Flood Advisory
Criteria:
Minor flooding observed or indicated by radar...
...such as a few inches of water over roads...
...or small creeks out of their banks, but not affecting structures
Flood Watch
Criteria:
Elevated potential for flooding...
...or flash flooding. Issued 6-24+ hours in advance of the event.
Excessive Heat Watch/Warning
Criteria:
Heat Index of 105ºF or greater for 2 consecutive hours
Heat Index of 110ºF or greater for 2 consecutive hours
Heat Advisory
Criteria:
Heat Index 96ºF to 104ºF for 2 consecutive hours through June 30
Heat Index 100ºF to 104ºF for 2 consecutive hours July 1 onward
Heat Index 100ºF to 104ºF for 2 consecutive hours
Heat Index 105ºF to 109ºF for 2 consecutive hours
High Wind Watch/Warning
Criteria:
Wind gusts of 58 MPH or greater
...or...
Sustained winds of 40 MPH or greater for one hour
Issued during non-convective weather
Wind Advisory
Criteria:
Wind gusts of 46 MPH to 57 MPH
...or...
Sustained winds of 31 MPH to 39 MPH for one hour
Issued during non-convective weather
Dense Fog Advisory
Criteria:
Visibility reduced to 1/4 mile or less
Visibility reduced to one nautical mile or less
Freezing Fog Advisory
Criteria:
Light ice accumulation from freezing fog
Frost/Freeze Season Begins
Criteria:
Freeze season begins May 1.
Freeze season begins April 21.
Freeze season begins April 11.
Freeze season begins April 1.
Frost/Freeze Season Ends
Criteria:
Freeze season ends no later than November 15.
Freeze season ends no later than November 4.
Red Flag Warning / Fire Weather Watch
Criteria:
10-hour fuel moisture less than 15%
...and...
Relative humidity of 30% or less
...and...
Wind Speed or Frequent Gusts of 20 MPH or greater
10-hour fuel moisture less than 10%
...and...
Relative humidity of 30% or less
...and...
Wind Speed or Frequent Gusts of 20 MPH or greater
10-hour fuel moisture 8% or less
...and...
Relative humidity less than 30%
...and...
Wind Speed of 20 MPH or greater
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