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knorthern_knight
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knorthern_knight

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25 Oct 2016
There are several sites that offer the GFS modelled text output. I stumbled across charlie.wxcaster.com first in my search, so I continue to use it. To get any station, with ICAO identifier "XXXX" the URL is

CODE
http://charlie.wxcaster.com/text/gfssfc/GFS_XXXX.txt


E.g. to get Toronto Pearson Airport, the URL is...

CODE
http://charlie.wxcaster.com/text/gfssfc/GFS_CYYZ.txt


This gives a wide-format text file 3-hourly-output to 144 hours. Here is a sample for the first 24 hours...

CODE
Station ID: CYYZ Lat:   43.66 Long:   79.63
GFS Model Run: 12Z 24OCT 2016 Clouds Bases and Tops are now agl
  HR Valid     2m Tmp 2m Dpt 10m Dir 10m Spd TPrcp CPrcp 1000-500 500mb 850mb 500mb  MSLP  TCC PRS WX  Low      Middle     High     Max    Min  Sfc Snowfall
                Deg F  Deg F   deg      kt    in.   in.     Thk    GPH   Tmp   Tmp    mb    %  TEXT   Clouds    Clouds    Clouds    Tmp    Tmp  Vis    in
   0 10/24 12Z   45     36     303      12    0.00  0.00    536    550   -4.0 -25.6 1017.1   0          CLR       CLR       CLR    ****   **** 20.0    0.0
   3 10/24 15Z   46     35     311      17    0.00  0.00    533    548   -4.3 -29.2 1019.1  97 -RA   031BKN057    FEW       CLR      46     45 20.0    0.0
   6 10/24 18Z   48     33     315      17    0.00  0.00    533    549   -4.1 -29.5 1020.1  95 -RA   035BKN057 159FEW182    CLR      48     45 20.0    0.0
   9 10/24 21Z   47     33     311      18    0.00  0.00    533    550   -4.5 -28.4 1020.9  41       046SCT060    CLR       CLR      48     47 20.0    0.0
  12 10/25 00Z   44     33     313      15    0.00  0.00    533    552   -5.2 -27.8 1022.6  41       043SCT055    CLR       CLR      48     44 20.0    0.0
  15 10/25 03Z   44     33     313      13    0.00  0.00    532    551   -5.2 -26.3 1023.6  96       039BKN059    CLR       CLR      45     44 20.0    0.0
  18 10/25 06Z   42     32     306      12    0.00  0.00    531    551   -5.8 -25.9 1024.1  78       040BKN061    CLR       CLR      45     41 20.0    0.0
  21 10/25 09Z   41     31     305      14    0.00  0.00    531    551   -6.1 -25.0 1025.0  14 -RA   051FEW065    CLR       CLR      42     40 20.0    0.0
  24 10/25 12Z   41     32     317      14    0.00  0.00    531    552   -6.0 -23.6 1026.6  18 -RA   054FEW069    CLR       CLR      42     40 20.0    0.0


The following script "getmod" downloads one ICAO station XXXX which produces a wide-format output file XXXX.txt and a more readable, narrower summary file zXXXX.txt. E.g. the command "getmod CYYZ" produces text files CYYZ.txt and zCYYZ.txt. getmod slices+dices the wide-format file, to get the data we're interested in. Here is "getmod"

CODE
#!/bin/bash
#
# Program expects 1 parameter, namely the 4-letter ICAO identifier, e.g.
# CYYZ = Toronto Pearson Int'l Airport
# CYOW = Ottawa Int'l Airport
# KLAX = Los Angeles Int'l Airport
#
# Process one line of data
process_1_line() {
#
# Start with zero-length output line
   outputline=""
#
# Add time, drybulb, and dewpoint
   outputline="${outputline}${REPLY:1:28}"
#
# Total preccip for 3-hour period
   outputline="${outputline}${REPLY:45:6}"
#
# Present weather text
   outputline="${outputline}${REPLY:95:6}"
#
# Max and Min temps for 3-hour period
   outputline="${outputline}${REPLY:131:12}"
#
# Total snow for 3-hour period
   outputline="${outputline}${REPLY:148:8}"
   echo "${outputline}" >&4
}
#
# Force input to all-uppercase
site=`echo "${1}" | tr [a-z] [A-Z]`
#
# Download data
wget http://charlie.wxcaster.com/text/gfssfc/GFS_${site}.txt -O ${site}.txt
#
# Open downloaded file for input
exec 3<${site}.txt
#
# Open output summary file for writing
exec 4>z${site}.txt
#
# Credits
echo "The following derived from http://charlie.wxcaster.com/" >&4
#
# Read 1st line from input
read <&3
#
# Write 1st 44 characters of 1st line
echo "${REPLY:0:44}" >&4
#
# Read 2nd line from input
read <&3
#
# Write 1st 30 characters of 2nd line
echo "${REPLY:0:30}" >&4
#
# Write separator line
echo "==============================" >&4
#
# Do first 2 lines to get a header
#
# Read a line of input
read <&3
process_1_line
#
# Read a line of input
read <&3
process_1_line
#
# Generate a sparator line
separator=`echo "${outputline}" | sed "s/./_/g"`
echo "${separator}" >&4
#
# Process the rest of the file
while read <&3
do
#
# Process a line
   process_1_line
done


getmod gets one station of GFS modelled data at a time. A companion script "getlist", calls "getmod" multiple times. E.g. if you want Hamilton, Toronto, and Ottawa, getlist would consist of...

CODE
#!/bin/bash
#
for station in CYHM CYYZ CYOW; do ./getmod ${station}; done


If you've never seen bash "file descriptors" ("filehandles" in most programming languages) used this way before, you can read up on it at http://www.tldp.org/LDP/abs/html/io-redirection.html
7 Mar 2016
The Bermuda High will be pumping moisture from the Gulf of Mexico northwards to Eastern Canada. This will result in 2 or 3 pulses of precipitation, mostly rain. Since it's due to one root cause, I decided to make it one thread. I didn't want to dump umpteen maps here, so here are a few from the the beginning of the event(s), where the GFS is more reliable...

Attached File  gfs_namer_042_850_temp_mslp_precip_l.gif ( 109.24K ) Number of downloads: 0

Attached File  gfs_namer_054_850_temp_mslp_precip_l.gif ( 107.93K ) Number of downloads: 0

Attached File  gfs_namer_066_850_temp_mslp_precip_l.gif ( 107.93K ) Number of downloads: 0

Attached File  gfs_namer_078_850_temp_mslp_precip_l.gif ( 105.42K ) Number of downloads: 0
22 Feb 2016
A real storm to track, wow! smile.gif EC has put out a SWS for of southern Ontario. Here's Toronto as an example...
QUOTE
11:02 AM EST Monday 22 February 2016
Special weather statement in effect for:

City of Toronto

A major storm system is expected to affect Ontario Wednesday and Thursday.

A low pressure system developing over the Southern States will track northeast to reach Southern Ontario Wednesday and Northern Ontario Wednesday night. This storm is expected to bring rain and significant snow to some areas, along with the possibility of freezing rain.

The location of the heaviest snow and areas at risk of receiving freezing rain will depend on the track of the low, which is still uncertain at this time. Please refer to weather statements and local forecasts which will be updated with more details as the storm system evolves.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to storm.ontario@ec.gc.ca or tweet reports to #ONStorm.


GFS shows rain first for Southern Ontario, followed by snow...

Attached File  gfs_namer_054_850_temp_mslp_precip_l.gif ( 105.19K ) Number of downloads: 4

Attached File  gfs_namer_060_850_temp_mslp_precip_l.gif ( 105.96K ) Number of downloads: 3

Attached File  gfs_namer_066_850_temp_mslp_precip_l.gif ( 105.4K ) Number of downloads: 1

Attached File  gfs_namer_072_850_temp_mslp_precip_l.gif ( 105.08K ) Number of downloads: 1

Attached File  gfs_namer_078_850_temp_mslp_precip_l.gif ( 104.48K ) Number of downloads: 1

Attached File  gfs_namer_084_850_temp_mslp_precip_l.gif ( 103.53K ) Number of downloads: 0

Attached File  gfs_namer_090_850_temp_mslp_precip_l.gif ( 106.58K ) Number of downloads: 1
25 Oct 2015
This event is already a thing on the US side of the forum http://forums.accuweather.com/index.php?showtopic=32500 Joe Bastardi, on his freebie "Saturday Summary" has a commentary about
  • Patricia hitting Mexico's west coast
  • some remnants surviving into the Gulf of Mexico
  • the remnants re-organize in the warm Gulf of Mexico waters
  • it'll give tropical storm conditions, and dump a bunch of rain in Texas
  • move NE, merge with a trough. and cause at least minor havoc in the Great Lakes area (wind and rain)
Here are some of the early maps. As noted in the title, it lasts a few days more, hitting Atlantic Canada along the way. I'll update them as the system approaches.

Attached File  gfs_namer_066_850_temp_mslp_precip_l.gif ( 95.64K ) Number of downloads: 2

Attached File  gfs_namer_072_850_temp_mslp_precip_l.gif ( 96.18K ) Number of downloads: 0

Attached File  gfs_namer_078_850_temp_mslp_precip_l.gif ( 95.8K ) Number of downloads: 0

Attached File  gfs_namer_084_850_temp_mslp_precip_l.gif ( 94.67K ) Number of downloads: 1


And I really really hope that Myforecast.com is out to lunch as per usual, because if it's correct, Toronto is going to get washed away on Wednesday...

Attached File  glubglub.png ( 93.14K ) Number of downloads: 2
22 Sep 2015
Given that Autumn starts Sept 23rd, I figure that October discussion should be in the fall thread.

QUOTE(tml78 @ Sep 21 2015, 07:43 AM) *
Hey guys...any insight to how the beginning of October will be? Any Chance of low to mid 20's temps?

Still a ways to go, so the progs are still jumping around a bit. The NAEFS for Toronto http://weather.gc.ca/ensemble/naefs/EPSgra...tml?station=YYZ shows highs in the high teens. The FIM9 is more variable. The following are the 18Z (2:00 PM EDT) prog maps for the first few days of October. This is a US product, so surface temps are in Fahrenheit.

Attached File  temp_2m_f234.png ( 58.09K ) Number of downloads: 1

Attached File  temp_2m_f258.png ( 56.3K ) Number of downloads: 0

Attached File  temp_2m_f282.png ( 55.57K ) Number of downloads: 0

Attached File  temp_2m_f306.png ( 55.43K ) Number of downloads: 0

Attached File  temp_2m_f330.png ( 57.39K ) Number of downloads: 1
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