INTERPRETATION OF NGM DIRECT MODEL OUTPUT GUIDANCE ACCESSED AT U OF U NGM output for station SLC at model initial time 97050912: TT PTT R1 R2 R3 VVV LI PS DDFF HH T1 T3 T5 00 27 20 45 009 04 20 1506 63 12 07 01 06 0 19 27 27 -08 02 19 1203 65 16 09 00 12 0 12 39 22 -16 00 16 1605 69 20 12 02 18 0 15 47 22 005 99 17 2111 68 19 12 01 24 0 19 46 20 000 98 17 2307 67 18 11 01 30 0 18 50 19 003 98 15 2106 68 19 11 01 36 0 19 46 21 -03 98 11 2306 71 21 13 02 42 0 24 70 38 -10 98 13 3611 69 18 11 01 48 0 29 66 39 003 98 11 0803 67 16 11 01 TT = Forecast hour PTT = 6-h accumulated precipitation in hundreths of an inch R1 = RH of model layer 1 (approximately 35 mb in thickness) R2 = Mean RH of model layers 2-9 (From approximately 35 mb above the ground to 500 mb) R3 = Mean RH of model layers 10-13 (Approximately 500 mb to tropopause) VVV = Vertial velocity (tenths of microbars/second) at 700 mb; Positive = rising air; negative = sinking air LI = Four layer lifted index (C); Negative values are added to 100 PS = Sea level pressure (mb); leading 9 or 10 is not encoded DDFF = Wind direction (tens of degrees) and speed (knots) in model layer 1 HH = 1000-500 mb thickness (decameters); leading 4 or 5 is not encoded T1 = Temperature (C) of model layer 1 (approximately 35 mb in thickness) T2 = Temperature (C) of model layer 3 (approximately at 900 mb) T3 = Temperature (C) of model layer 5 (approximately at 800 mb); negative values are added to 100 ----------------------------------------------------------------------------------------------------------------------------------- INTERPRETATION OF NGM MOS BASED ON NOAA/NWS TECHNICAL PROCEDURES BULLETIN NO. 408: NGM-BASED MOS GUIDANCE - THE FOUS14/FWC MESSAGE SLC SCW NGM MOS GUIDANCE 5/09/97 1200 UTC - Message ID [Station, Routing, Model, Initial Date and Time (UTC) DAY /MAY 9 /MAY 10 /MAY 11 / - Valid Month and Day (UTC) HOUR 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 - Valid Hour (UTC) MN/MX 50 79 52 78 - Maximum or minimum temperature for daytime/nightime period (F) TEMP 73 77 77 65 57 54 52 62 73 77 76 66 59 56 54 62 73 76 75 - Temperature at specified time (F) DEWPT 34 36 35 40 40 39 39 41 39 40 38 44 44 43 42 43 41 42 40 - Dew point at specified time (F) CLDS SC SC SC SC SC SC SC SC SC SC BK BK BK SC SC SC SC SC BK - Opaque cloud cover forecast for specified time (see below) WDIR 14 33 34 33 16 15 15 15 17 34 35 22 19 15 16 15 32 33 34 - Wind direction ( x10 = compass direction) for specified time ) WSPD 03 08 08 06 06 08 07 09 06 06 08 05 05 01 02 02 03 07 05 - Wind speed (kts) for specified time POP06 0 0 0 2 5 9 8 8 11 - Probability of precipitation for 6-h period ending at specified time POP12 0 7 14 15 - Probability of precipitation for 12-h period ending at specified time QPF 0/ 0/ 0/0 0/ 0/0 0/ 0/0 0/ 0/0 - Precipitation amount forecast for 6-h and 12-h periods (see below) TSV06 6/13 6/ 2 0/ 0 0/ 1 14/ 4 10/ 0 1/ 0 2/ 0 16/ 9 - Thunderstorm/conditional svr T-storm probs for 6-h period TSV12 9/14 1/ 0 19/ 4 3/ 0 - Thunderstorm/conditional svr T-storm probs for 12-h period PTYPE R R R R R R R R R R R R R R R - Conditional precipitation type forecast for specified time POZP 0 1 0 0 2 2 6 0 1 0 0 1 3 1 0 - Conditional probability of freezing precip or ice pellets if precipitating POSN 0 0 2 2 0 3 3 6 1 0 0 0 0 0 0 - Conditional probability of snow for specified time if precipitating SNOW 0/ 0/ 0/0 0/ 0/0 0/ 0/0 0/ 0/0 - Snow amount for 6- and 12 -h periods CIG 7 7 7 7 7 7 7 7 7 7 7 7 7 - Ceiling height forecast for specified time (see below) VIS 5 5 5 5 5 5 5 5 5 5 5 5 5 - Visibility forecast for specified time (see below) OBVIS N N N N N N N N N N N N N - Obstructions to vision forecast for specified time (see below) CLDS: QPF Format "A/B": SNOW format "A/B": CIG: CL - Clear A - Value for 6-h period A - Value for 6-h period 1 = < 200 ft. SC - Scattered 0 = No precip 0 = No snow 2 = 200-400 ft. BK - Broken 1 = .01-.09" 1 = Trace - < 2" 3 = 500-900 ft. OV - Overcast 2 = .10-.24" 2 = > or = 2" 4 = 1000-3000 ft. 3 = .25-.49" 5 = 3100-6500 ft. PTYPE: 4 = .50-.99" B - Value for 12-h period 6 = 6600-12000 ft. R - Liquid 5 = > or = 1.00" 0 = No snow 7 = > 12000 ft. Z - Freezing rain or ice pellets B - Value for 12-h period 1 = trace - < 2" S - Snow 0 = No precip 2 = 2 - < 4" OBVIS: 1 = .01-.09" 3 = 4 - < 6" H = Haze VIS: 2 = .10-.24" 4 = > or = 6" F = Fog 1 = < 1/2 mi. 3 = .25-.49" N = No haze or fog 2 = 1/2-7/8 mi. 4 = .50-.99" 3 = 1 - 2 3/4 mi. 5 = 1.00-1.99" 4 = 3 - 5 mi. 6 = > or = 2.00" 5 = > 5 mi.