Build a weather alert system

Here is a complete implementation of a basic weather alert system in Python using the OpenWeatherMap API. It fetches weather data, checks for extreme weather conditions, and sends alerts via email.

Requirements:

1. Python 3.7+

2. OpenWeatherMap API Key (https://openweathermap.org/)

3. requests, smtplib, and email modules (standard except requests)

Step-by-Step Weather Alert System Code

python
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import requests
import smtplib
from email.message import EmailMessage

# Configuration
API_KEY = 'YOUR_OPENWEATHERMAP_API_KEY'
CITY = 'New York'
THRESHOLD_TEMP = 35  # Celsius
EMAIL_SENDER = 'your_email@example.com'
EMAIL_PASSWORD = 'your_email_password'
EMAIL_RECEIVER = 'receiver_email@example.com'

def get_weather(city):
    url = f'https://api.openweathermap.org/data/2.5/weather?q={city}&appid={API_KEY}&units=metric'
    response = requests.get(url)
    response.raise_for_status()
    return response.json()

def check_alert_conditions(weather_data):
    temp = weather_data['main']['temp']
    weather = weather_data['weather'][0]['main'].lower()

    alerts = []

    if temp > THRESHOLD_TEMP:
        alerts.append(f'Temperature Alert: {temp}°C exceeds {THRESHOLD_TEMP}°C')

    if 'storm' in weather or 'rain' in weather:
        alerts.append(f'Weather Alert: Detected "{weather}" conditions')

    return alerts

def send_email(subject, body):
    msg = EmailMessage()
    msg['From'] = EMAIL_SENDER
    msg['To'] = EMAIL_RECEIVER
    msg['Subject'] = subject
    msg.set_content(body)

    with smtplib.SMTP_SSL('smtp.gmail.com', 465) as smtp:
        smtp.login(EMAIL_SENDER, EMAIL_PASSWORD)
        smtp.send_message(msg)
        print('Alert email sent.')

def main():
    try:
        weather_data = get_weather(CITY)
        alerts = check_alert_conditions(weather_data)

        if alerts:
            subject = 'Weather Alert Notification'
            body = 'n'.join(alerts)
            send_email(subject, body)
        else:
            print('No weather alerts.')

    except Exception as e:
        print(f'Error occurred: {e}')

if __name__ == '__main__':
    main()

How It Works:

• Fetches current weather using OpenWeatherMap API.

• Compares temperature and conditions to defined thresholds.

• Sends an email alert if the conditions match.

Optional Enhancements:

• Use cron or Task Scheduler for periodic checks.

• Integrate with Twilio or Telegram API for SMS or chatbot alerts.

• Extend to multiple cities or weather parameters (wind speed, humidity).

• Log events for historical alert records.

Let me know if you want this adapted into a web app, mobile app, or embedded system.