Sure, I can help you with that. Here's the modified code using the AccuWeather API instead of OpenWeatherMap API. Please replace `your_api_key` with your own AccuWeather API key, `your_latitude` with your location's latitude, and `your_longitude` with your location's longitude. 

```python
import requests
import pandas as pd
import time
import os
from datetime import datetime

# Replace with your own AccuWeather API key
API_KEY = 'your_api_key'

# Set your location's latitude and longitude
latitude = 'your_latitude'
longitude = 'your_longitude'

# Set the output CSV file path
output_csv = 'precipitation_data.csv'

def get_precipitation_data():
    url = f'http://dataservice.accuweather.com/currentconditions/v1/1-349727_1_AL?apikey={API_KEY}&details=true'
    response = requests.get(url)
    data = response.json()
    return data[0]['WeatherText'], data[0]['RelativeHumidity']

def save_to_csv(timestamp, description, humidity):
    data = {'timestamp': [timestamp], 'description': [description], 'humidity': [humidity]}
    df = pd.DataFrame(data)
    if not os.path.exists(output_csv):
        df.to_csv(output_csv, index=False, mode='w', header=True)
    else:
        df.to_csv(output_csv, index=False, mode='a', header=False)

if __name__ == '__main__':
    while True:
        timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        description, humidity = get_precipitation_data()
        save_to_csv(timestamp, description, humidity)
        time.sleep(1800) # Sleep for 30 minutes
```
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