NWS_Alert

A easy way to subscribe to National Weather Service (NWS) alerts.

Install

pip install nws_alert

Usage

from nws import NWS

nws = NWS()


# Subscribe to alerts in North Carolina with severity "Moderate" or "Severe"
@nws.alert(state='NC', severity='Moderate')
@nws.alert(state='NC', severity='Severe')
def MyStateAlert(entry):
    print('MyStateAlert(', entry.severity, entry.title)


# Subscribe to events in my "zone" with urgency "Immediate"
@nws.alert(zone='NCC101', urgency='Immediate')  # See https://alerts.weather.gov/ for complete zone list
def MyZoneAlert(entry):
    print('MyZoneAlert(', entry.urgency, entry.title)


# nws.NowAlerts() will return any event happening now. It will not return future or past events.
# Only events from states/zones you have subscribed to with @nws.alert will be included.
# This will return all events regardless of severity, certainty, or urgency

nowAlerts = nws.NowAlerts()
for entry in nowAlerts:
    print('now entry=', entry)

Notes

The @nws.alert decorator will only be triggered once per NWS alert. The alerts are logged to a JSON file in the current directory so that the code will remember which alerts have already been triggered.

Synchronous Subscriptions

You can update the subscriptions on the fly by creating a Subscription object and calling the .Update()

sub = Subscription(state='NC', severity='Moderate')
entries = sub.Update()
print('entries=', entries)

>>> entries= [<nwscapparser3.nws_cap_parser.CAPEntry object at 0x00000225DD91C7C0>, <nwscapparser3.nws_cap_parser.CAPEntry object at 0x00000225DD91C6A0>]

Event Attributes

See https://docs.oasis-open.org/emergency/cap/v1.2/CAP-v1.2-os.pdf for more detailed CAP info

SEVERITY:

• Severe: Significant threat to life or property
• Moderate: Possible threat to life or property
• Minor: Minimal to no known threat to life or property
• Unknown: Severity unknown

CERTAINTY:

• Observed: Determined to have occurred or to be ongoing
• Likely: Likely (p > ~50%)
• Possible: Possible but not likely (p <= ~50%)
• Unlikely: Not expected to occur (p ~ 0)
• Unknown: Certainty unknown

URGENCY:

• Immediate: Responsive action SHOULD be taken immediately
• Expected: Responsive action SHOULD be taken soon (within next hour)
• Future: Responsive action SHOULD be taken in the near future
• Past: Responsive action is no longer required
• Unknown: Urgency not known