AOS 452 Lab 1: UNIX and the WEATHER program - Marrella

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(0000 and 1200 UTC), and the AVN MOS numbers are available four times daily (0000, 0600,1200, and 1800 UTC).A sample MOS product from the Eta is given below:KMSN ETA MOS GUIDANCE 9/08/2008 1200 UTCDT /SEPT 8/SEPT 9 /SEPT 10 /SEPT 11HR 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12N/X 41 67 44 71 55TMP 56 56 53 49 44 43 43 57 64 65 61 53 48 46 47 61 67 69 65 59 58DPT 48 47 47 45 41 40 40 44 43 43 45 46 45 44 45 50 50 50 52 53 54CLD OV OV OV SC CL CL CL CL SC SC CL CL CL CL CL SC SC SC BK SC OVWDR 25 24 29 28 27 28 29 30 31 28 14 16 16 13 12 14 16 16 15 15 17WSP 05 04 03 03 03 02 02 05 06 05 03 02 02 02 03 08 10 11 07 09 06P06 86 22 5 1 1 3 2 5 7 14 20P12 28 1 6 7 28Q06 3 0 0 0 0 0 0 0 0 0 0Q12 0 0 0 0 0T06 21/ 0 2/ 0 2/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0 0/ 0999/99T12 21/ 0 2/ 0 0/ 0 0/ 0 999/99SNW 0 0 0CIG 6 5 6 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 6VIS 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 5OBV N N N N N N N N N N N N N N N N N N N N HZA handout has been provided with information to decode the MOS product. Much of theinformation is self-explanatory (e.g., temperature, dew point, etc.). The values in a certaincolumn represent the statistically derived forecast values at that time for a specific variable.The sub-commands in the weather program for these products are/ngmmos, /newavnmos, /mrfmos, and /etamos.8Blindly following what the model statistics show will lead to large forecast errors, so do not getin the habit of “MOScasting”. If you have thoroughly analyzed the weather situation and cameup with temperatures and precipitation values similar to the model output, you may have a higherdegree of confidence in your forecast.Note that getting each type of output for a particular station is the same as for getting surfaceobservations. First you type the subcommand for the product that you wish to view, then get thedata using the same format as before:msn 12z -- get the most current 1200 UTC product for Madison, WImke l -- get the latest product for Milwaukee, WINational Weather Service data is also available through the weather program. Forecastdiscussions (/FOREDISS), as well as quick forecasts are readily available (/FP4).Forecast Discussions
9To read the NWS forecast discussions from a state, such as Wisconsin, go to the /FOREDISSsubcommand and type @wi l. This is probably the easiest way to see a forecast discussion for aregion since the discussions are only made by local NWS offices.FP4In addition to model guidance, the National Weather Service issues numerical forecasts forspecific stations twice daily. Included are the day one to three temperature forecasts andprecipitation probabilities.The sub-command in the weather program for this product is /fp4.The fp4 product appears as follows from the weather program:dd/hhmm ppp wW tt1/tt2 tt3/tt4 tt5 ffPPPdd = dayhhmm = hour and minute issuedppp = placewW = day1 and day2 weather typettn = temperature (day1 maximum, day1 minimum, etc...)ff = forecaster id numberPPP = 12 hour period probability of precipitation in tens of percentThe following is an actual sample:06/0926 FTW BT 077/058 082/064 077 10137Here is the fp4 forecast decoded:Forecast station:Fort Worth, TexasDate/Time:6th of the month at 0926 UTC.Today's Weather: Partly cloudy (B).Tomorrow's Weather: Thundershowers (T).Today: forecast hight: 77 F forecast low: 58FTomorrow: forecast high: 82F forecast low: 64 FDay 2: forecast high: 77FForecaster 10 prepared this FP4.Precipitation probabilities are: 10% for today, 30% tonight and 70% tomorrow.Forecast Discussions can be found using the /forediss subcommand. NWS forecastdiscussion are issued by local NWS offices. The easiest find the discussion for a region is tosearch by state or if you know the three-letter station office code you can enter that as well.@wi lmkx lThis will give you the latest discussion for any region of Wisconsin.This will give you the latest discussion from MKX, the forecast office inMilwaukee, WI
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AOS 452 Lab 1: UNIX and the WEATHER program - Marrella

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