Mission Peak Weather Worker

A Cloudflare Worker that provides detailed weather reports for Mission Peak trail runs, specifically for Tuesday and Thursday morning runs.

Features

• Fetches weather data for both trailhead and summit locations
• Detects temperature inversions
• Analyzes cloud cover and marine layer conditions
• Reports wind conditions
• Sends formatted reports to Slack
• Supports on-demand weather reports via Slack slash command

Setup

1. Login to Cloudflare:

npx wrangler login

2. Set up your secrets:

npx wrangler secret put SLACK_WEBHOOK_URL
npx wrangler secret put SLACK_SIGNING_SECRET

3. Deploy the worker:

npx wrangler deploy

4. Set up the Slack slash command:
   • Go to your Slack workspace settings
   • Navigate to "Slash Commands"
   • Click "Create New Command"
   • Set the following:
     • Command: /mission-weather
     • Request URL: https://mission-weather.[your-worker-subdomain].workers.dev
     • Short Description: "Get current weather conditions for Mission Peak"
   • Save the command
   • Go to "Basic Information" in your Slack App settings
   • Under "App Credentials", copy the "Signing Secret"
   • Set it as the SLACK_SIGNING_SECRET using wrangler

Configuration

The worker is configured to run at 8pm PT on Monday and Wednesday nights, providing weather reports for the next morning's run.

Schedule and Timezone Handling

The worker is scheduled to run at 3am UTC on Monday and Wednesday. This ensures it runs at 8pm PT regardless of daylight savings time:

• During Pacific Standard Time (PST, November-March):
  • 3am UTC = 7pm PT (UTC-8)
• During Pacific Daylight Time (PDT, March-November):
  • 3am UTC = 8pm PT (UTC-7)

To maintain a consistent 8pm PT runtime year-round, we would need to adjust the schedule twice a year. For simplicity, the worker is scheduled to run at 3am UTC, which means:

• During PST: Reports will be sent at 7pm PT
• During PDT: Reports will be sent at 8pm PT

Note: Cloudflare Workers cron uses a different day numbering system than standard cron:

• 1 = Sunday
• 2 = Monday
• 3 = Tuesday
• 4 = Wednesday
• 5 = Thursday
• 6 = Friday
• 7 = Saturday

Usage

Scheduled Reports

The worker automatically sends weather reports to your configured Slack channel at 7pm/8pm PT on Monday and Wednesday nights.

On-Demand Reports

You can request a weather report at any time using the Slack slash command:

/mission-weather

This will generate and post a current weather report to the channel.

Testing

Local Testing

1. Create a .dev.vars file in the project root with your environment variables:

MISSION_PEAK_SUMMIT_LAT=37.5133
MISSION_PEAK_SUMMIT_LON=-121.8800
MISSION_PEAK_SUMMIT_ELEVATION=767
TRAILHEAD_LAT=37.5100
TRAILHEAD_LON=-121.8800
TRAILHEAD_ELEVATION=0
SLACK_WEBHOOK_URL=your_slack_webhook_url_here
SLACK_SIGNING_SECRET=your_slack_signing_secret_here

2. Start the development server:

npx wrangler dev

3. Test the worker by visiting:

http://localhost:8787/test

or using curl:

curl http://localhost:8787/test

Production Testing

After deploying the worker, you can test it by visiting:

https://mission-weather.[your-worker-subdomain].workers.dev/test

The test endpoint will:

• Fetch current weather data
• Process it just like the scheduled job would
• Send the report to your Slack channel
• Return a success message

This allows you to verify that:

• The API calls are working
• The data processing is correct
• The Slack integration is functioning
• The message formatting looks good

Required API Keys

• Slack Webhook URL (create an incoming webhook in your Slack workspace)
• Slack Signing Secret (from your Slack App's Basic Information)

Weather Data Sources

The worker uses Open-Meteo API to fetch:

• Temperature at trailhead and summit
• Wind conditions
• Cloud cover data
• Additional atmospheric conditions