| * High Wind Watch (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 48 hours, there is at least a 50 percent chance of sustained wind speeds of at least 36 mph lasting 1 hour or more. Also issued when there is a 50 percent chance of a wind gust of 45 mph.
|
| * Freeze Watch (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 12 to 48 hours, there is at least a moderate degree of confidence (50% - 70%) that temperatures will drop to 32°F or lower. These are issued on, or after March 20th in Spring, and prior to November 20th in Autumn. In Autumn, the issuance of Freeze Watches will be discontinued prior to November 20 if temperatures fall below 28°F over a wide area.
|
| * Excessive Heat Watch (NPW) |
WMO Header: WWUS72 KFFC
Example: N/A |
Issued when there is at least a 50 percent chance that daytime heat indices will exceed 109°F for at least 2 consecutive days.
|
| * High Wind Warning (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 24 hours, there is at least an 80 percent chance of sustained wind speeds of at least 36 mph lasting 1 hour or more. Also issued when there is an 80 percent chance of a wind gust of at least 45 mph.
|
| * Freeze Warning (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 24 hours, there is a high degree of confidence (at least 80%) that temperatures will drop to 32°F or lower. These are issued on, or after March 20th in Spring, and prior to November 20th in Autumn. In Autumn, the issuance of Freeze Warnings will be discontinued prior to November 20 if temperatures fall below 28°F over a wide area. After November 20th, if temperatures are expected to fall low enough to cause damage (i.e. broken water pipes), a Special Weather Statement (SPS) will be issued.
|
| * Excessive Heat Warning (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when there is at least an 80 percent chance that daytime heat indices will exceed 109°F for at least 2 consecutive days.
|
| * Wind Advisory (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 24 hours, there is at least an 80 percent chance of wind speeds 20 to 35 mph lasting for one hour or longer or when wind gusts of at least 35 mph are expected.
|
| * Frost Advisory (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, within the next 24 hours, there is a high probability (at least 80%) of significant frost. These are issued on, or after March 20th in Spring, and prior to November 20th in Autumn. In Autumn, the issuance of Frost Advisories will be discontinued prior to November 20 if temperatures fall below 28°F over a wide area.
|
| * Heat Advisory (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when there is at least an 80 percent chance that daytime heat indices will exceed 104°F for at least 2 consecutive days.
|
| * Dense Fog (or Smoke) Advisory (NPW) |
WMO Header: WWUS72 KFFC
Example: archived version |
Issued when, during the next 24 hours, there is at least an 80 percent chance of widespread visibility restrictions of 1/4 mile or less.
|
| * Frost Outlook (SPS) |
WMO Header: WWUS82 KFFC
Example: N/A |
Issued when, within the next 24 to 48 hours, there is a moderate probability (50% - 70%) of significant frost. These are issued on, or after March 20th in Spring, and prior to November 20th in Autumn. In Autumn, the issuance of Frost Outlooks will be discontinued prior to November 20 if temperatures fall below 28°F over a wide area.
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