Product
|
Criteria
|
|
Excessive Heat Watch |
Conditions are favorable for Heat Index values of 110 degrees or
higher for 3 hours or more in the next 12 to 48 hours. |
|
Freeze Watch |
Conditions are favorable
for a freeze event to meet or exceed Freeze Warning criteria in the
next 12 to 48 hours during the locally defined growing season. |
|
High Wind Watch |
Conditions are favorable
for sustained non-convective winds >= 40 mph (35 knots) lasting for
one hour or longer and/or gusts >= 58 mph (50 knots) for any
duration in in the next 12 to 48 hours. |
|
Blowing Dust Advisory |
Widespread or localized
blowing dust reducing visibilities to one mile or less, but greater
than 1/4 mile. Winds of 25 mph or greater is usually required. |
|
Dense Fog Advisory |
Widespread fog reducing
visibilities to <= 1/4 mile. |
Dense Smoke Advisory
|
Widespread or localized
smoke reducing visibilities to 1/4 mile or less.
|
Freezing Fog Advisory
|
Very light ice accumulation
from freezing fog. |
|
Frost Advisory |
Minimum shelter temperature
forecast to be between 32 to 36°F and conditions are conducive to
frost during the growing season. |
|
Heat Advisory |
Heat Index of 100 degrees
or higher for 3 hours or more. Can continue overnight if the HI
remains at or above 75 overnight. Do not issue if nighttime criteria
are met and daytime criteria aren't expected. |
|
Wind Advisory |
Sustained
non-convective winds of 30 to 39 mph lasting for one hour or longer
or winds between 45-57 mph (inclusive) for any duration. |
Dust Storm Warning
|
Widespread or localized
blowing dust reducing visibilities to 1/4 mile or less. Sustained
winds of 25 mph or greater are usually required.
|
|
Excessive Heat Warning |
Heat Index of 110 degrees
or higher for 3 hours or more. |
|
Freeze Warning |
Temperatures at or below 32
F for a period of 2 hours or longer during the growing season. |
|
High Wind Warning |
Sustained
non-convective winds >= 40 mph (35 knots) lasting for one hour or
longer or winds >= 58 mph (50 knots) for any duration. |