Brian Blaylock blaylockbk

Meteorologist

blaylockbk / datetime lists in python

Created October 31, 2016 21:21

	from datetime import datetime, timedelta
	base = datetime.today()
	numdays = 5
	date_list = [base - timedelta(days=x) for x in range(0,numdays)]

blaylockbk / date string list to python datetime list

Last active May 29, 2021 10:29

	from datetime import datetime

	dates = ['01/01/2016 04:50','01/01/2016 05:50','01/01/2016 06:50','01/01/2016 07:50']
	DATE = [datetime.strptime(x,'%m/%d/%Y %H:%M') for x in dates]

blaylockbk / bad way to convert date strings to datetime objects

Created October 31, 2016 21:28

	DATES = np.array([])
	for i in dates:
	DATES = np.append(DATES,datetime.strptime(i,'%m/%d/%Y %H%M'))

blaylockbk / list of Epoch times to python datetimes

Last active November 3, 2016 21:49

Takes a list of Epoch times and converts it to a list of python datetime objects

	# where dates is a list or numpy array of epoch dates...
	DATE = [datetime.utcfromtimestamp(x) for x in dates]

blaylockbk / date strings list to python datetime objects

Created November 1, 2016 16:30

this method uses numpy vectorized function, which is slightly faster than using a list generator

	import numpy as np
	import datetime
	def datestr_to_datetime(x):
	return datetime.datetime.strptime(x,'%Y-%m-%dT%H:%M:%SZ')

	# where dates is some list of dates as a string...
	# vectorize the function
	converttime = np.vectorize(datestr_to_datetime)
	DATES = converttime(dates)

blaylockbk / untar HRRR

Created November 10, 2016 15:30

untar select HRRR files from the compressed MesoWest archive

	# To untar just about everything
	tar -xzvf models.tar.gz 20160101/models/hrrr/

	# To untar just the HRRR pressure fields for analysis hours
	tar -zxvf models.tar.gz --wildcards --no-anchored 'hrrr.t*z.wrfprsf00.grib2'

	$ to untar just the HRRR surface fields for analysis hours
	tar -zxvf models.tar.gz --wildcards --no-anchored 'hrrr.t*z.wrfsfcf00.grib2'

blaylockbk / verify_GFS_pygrib.py

Last active November 11, 2016 22:35

Verify GFS dewpoint with MesoWest observation for class assignment

	# Brian Blaylock
	# ATMOS 6910 Homework
	# 10 November 2016

	# Look at the figures here:
	# http://kbkb-wx-python.blogspot.com/2016/11/verifying-gfs-dewpoint-data-with.html

	"""
	[X] Reads a GRiB forecast file from the GFS (15%)
	[X] Extracts Temperature and Relative Humidity from ingest (5%)

blaylockbk / make_imgs_to_movie_ffmpeg

Last active March 27, 2020 16:33

make a video or movie with ffmpeg

	ffmpeg -f image2 -pattern_type glob -framerate 6 -i '*.png' foo.avi


	# Retain high resolution
	ffmpeg -f image2 -pattern_type glob -framerate 6 -i '*.png' -vb 20M foo.avi


	# Convert .mov to .avi
	ffmpeg -i file.mov file.avi

blaylockbk / create_dir.py

Created November 29, 2016 16:08

Create directory if it doesn't exits

	import os
	OUTDIR = '/this/path/will/be/created/'
	if not os.path.exists(OUTDIR):
	os.makedirs(OUTDIR)

blaylockbk / multipro_template.py

Last active November 4, 2024 16:03

Template for Python multiprocessing and multithreading

	import multiprocessing
	from multiprocessing.dummy import Pool as ThreadPool

	import numpy as np


	def my_multipro(items, func, max_cpus=12):
	"""Do an embarrassingly parallel task using multiprocessing.

	Use this for CPU bound tasks.