DVN Upper Air (Weather Balloon) Page

OB RELEASE OB RELEASE TIME TIME WINDOW TIME TIME WINDOW 00Z 2300Z-0029Z 12Z 1100Z-1229Z 01Z 0030Z-0129Z 13Z 1230Z-1329Z 02Z 0130Z-0229Z 14Z 1330Z-1429Z 03Z 0230Z-0329Z 15Z 1430Z-1529Z 04Z 0330Z-0429Z 16Z 1530Z-1629Z 05Z 0430Z-0459Z 17Z 1630Z-1659Z 06Z 0500Z-0629Z 18Z 1700Z-1829Z 07Z 0630Z-0729Z 19Z 1830Z-1929Z 08Z 0730Z-0829Z 20Z 1930Z-2029Z 09Z 0830Z-0929Z 21Z 2030Z-2129Z 10Z 0930Z-1029Z 22Z 2130Z-2229Z 11Z 1030Z-1059Z 23Z 2230Z-2259Z

Frequency Selection Chart ___________________________________________ | || | | | | | || 1676 | 1678 | 1680 | 1682 | |--------||=======|=======|=======|=======| | White || UNCUT | UNCUT | CUT | CUT | |--------||-------|-------|-------|-------| | Black || UNCUT | CUT | UNCUT | CUT | |--------||-------|-------|-------|-------| | Dip || OOOO | OO O | OOO | OO | | Switch || | O | O | OO | |--------||-------|-------|-------|-------|

Radiosonde CDU & RWS Signal Strength BASELINE: 0 to -48 AFTER RELEASE: -49 to -69 FLIGHT: -70 to -111 SUSPEND: -112 to -130

Code Clouds (x/10) 0 0 1 <=1/10 (1/8) 2 2/10-3/10 (2/8) 3 4/10 (3/8) 4 5/10 (4/8) 5 6/10 (5/8) 6 7/10-8/10 (6/8) 7 >= 9/10 (7/8) 8 10/10 (8/8) 9 Sky obscrd by fog/wx / Clouds can't be seen, NOT due to fog / wx

Code Coding Criteria 9 CB / CB w/ anvil is present 3 CB not fibrous / w/out anvil 4 SC formed by spreading of CU 8 CU & SC w/ diff. bases 2 TCU / mod. CU present 1 CU w/ little vert. extent 5 SC 6 ST 7 STFRA / CUFRA 0 No clouds / Low clouds obscured by fog/other phenom

Code Height (ft) 0 0-100 1 200-300 2 400-600 3 700-900 4 1000-1900 5 2000-3200 6 3300-4900 7 5000-6500 8 7000-8000 9 >=8500 or no clouds / Unknown

Code Coding Criteria 9 AC w/ chaotic sky 8 ACCAS 7 AC w/ NS/AS OR AC opaque / 1/more levels 6 AC from spreading CU/CB 5 AC progressively invading sky 4 AC changing in appearance 3 AC semi-trans. @ 1 level 2 No AC but opaque NS / AS 1 No AC but semi-trans. NS/AS 0 No mid clouds / Mid clouds not visible

Code Coding Criteria 9 CC alone / w/ CI / CS 7 CS covers whole sky 8 CS not covering the whole sky 6 CS invading sky >=45° above horizon 5 CS invading sky <45° above horizon 4 CI invading sky 3 Dense CI from a CB 2 Dense CI 1 CI 0 No high clouds / High clouds not visible

Code Associated Weather 99 Severe thunderstorm with hail 98 Thunderstorm with duststorm 97 Severe thunderstorm with no hail 96 Thunderstorm with hail 95 Thunderstorm, no hail but rain and/or snow 94 Thunderstorm previous hour; S, S+, RS, R+S+ @ ob 93 Thunderstorm previous hour; S-, R-S-, @ ob 92 Thunderstorm previous hour; R or R+ @ ob 91 Thunderstorm previous hour; R- @ ob 90 Moderate / heavy shower of hail, not with thunder 89 NOT USED 88 SPW or SPW+ 87 SPW- 86 SW or SW+ 85 SW- 84 Moderate / heavy shower of mixed rain & snow 83 RW-SW- 82 Violent RW (rainfall rates of 1 inch/hour) 81 RW or RW+ 80 RW- 79 Ice Pellets (any intensity) 78 Snow crystals 77 Snow grains 76 Ice crystals 75 Continuous S+ 74 Intermittent S+ 73 Continuous S 72 Intermittent S 71 Continuous S- 70 Intermittent S- 69 R or L mixed with S moderate / heavy 68 R or L mixed with S light 67 ZR or ZR+ 66 ZR- 65 Continuous R+ 64 Intermittent R+ 63 Continuous R 62 Intermittent R 61 Continuous R- 60 Intermittent R- 59 Drizzle and rain, moderate / heavy 58 Drizzle and rain, light 57 ZL or ZL+ 56 ZL- 55 Continuous L+ 54 Intermittent L+ 53 Continuous L 52 Intermittent L 51 Continuous L- 50 Intermittent L-

Code Associated Weather *17* Thunderstorm, but no precipitation at ob time 49 Fog depositing rime, sky invisible 48 Fog depositing rime, sky visible 47 F or IF, sky invisible, thicker in past hour 46 F or IF, sky visible, thicker in past hour 45 F or IF, sky invisible, no change in past hour 44 F or IF, sky visible, no change in past hour 43 F or IF, sky invisible, thinner in past hour 42 F or IF, sky visible, thinner in past hour 41 F or IF in patches, thicker in past hour 40 F or IF at a distance, not at station 39 Blowing Snow with visibility less than 5/16 mile 38 Blowing Snow with visibility 5/16 to 6 miles 37 NOT USED 36 Drifting snow, below eye level 35 Severe dust or sandstorm begun or increasing 34 Severe dust or sandstorm no change past hour 33 Severe dust or sandstorm decreased past hour 32 Light / moderate dust or sandstorm begun or increasing 31 Light / moderate dust or sandstorm no change past hour 30 Light / moderate dust or sandstorm decreased past hour 29 Thunderstorm not at ob, but in previous hour 28 Fog or Ice Fog not at ob, but in previous hour 27 IPW, A, or mixed with RW in previous hour 26 Showers of S or RS in previous hour 25 Showers or R not at ob, but in previous hour 24 ZL or ZR not at ob, but in previous hour 23 RS or IP (not showers) in previous hour 22 Snow (not SW) not at ob, but in previous hour 21 Rain (not RW) not at ob, but in previous hour 20 L or SG (not showers) in previous hour 19 Funnel cloud or Tornado near site in past hour 18 Wind squalls near site in past hour 17 (SEE TOP OF THIS COLUMN) 16 Virga, not at site, but within 3 miles 15 Virga, not at site, but greater than 3 miles 14 Virga over the ob site 13 Lightning visible, but no thunder heard 12 Continuous area of GF, visibility < 5/8 mile 11 Patches of ground fog, visibility < 5/8 mile 10 Mist (Fog with visibility greater than 5/8 mile) 09 Dust or sandstorm at ob or in previous hour 08 Dust Devil 07 Loose dust or sand raised by wind 06 Dust suspended in air, not windblown 05 Haze (any visibility) 04 Visibility 6 miles or less due to smoke 03 Clouds forming or developing 02 State of sky unchanged 01 Clouds dissolving or less developed 00 Clouds not observed or observable

CELSIUS TO FAHRENHEIT CONVERSION TABLE F C F || F C F || F C F || F C F || C F -------------||--------------||---------------||----------------||----------- 32 -0.0+ 32 || 14 -10.0+ 50 || -4 -20.0+ 68 || -22 -30.0+ 86 || 40.0+ 104 30 -1.0+ 34 || 12 -11.0+ 52 || -6 -21.0+ 70 || -24 -31.0+ 88 || 41.0+ 106 28 -2.0+ 36 || 10 -12.0+ 54 || -8 -22.0+ 72 || -26 -32.0+ 90 || 42.0+ 108 27 -3.0+ 37 || 9 -13.0+ 55 || -9 -23.0+ 73 || -27 -33.0+ 91 || 43.0+ 109 25 -4.0+ 39 || 7 -14.0+ 57 || -11 -24.0+ 75 || -29 -34.0+ 93 || 44.0+ 111 23 -5.0+ 41 || 5 -15.0+ 59 || -13 -25.0+ 77 || -31 -35.0+ 95 || 45.0+ 113 21 -6.0+ 43 || 3 -16.0+ 61 || -15 -26.0+ 79 || -33 -36.0+ 97 || 19 -7.0+ 45 || 1 -17.0+ 63 || -17 -27.0+ 81 || -35 -37.0+ 99 || 18 -8.0+ 46 || 0 -18.0+ 64 || -18 -28.0+ 82 || -36 -38.0+ 100 || 16 -9.0+ 48 || -2 -19.0+ 66 || -20 -29.0+ 84 || -38 -39.0+ 102 || FAHRENHEIT TO CELSIUS CONVERSION TABLE F C F || F C F || F C F || F C F || C F -------------||--------------||---------------||----------------||----------- 32 -0.0+ 32 || 14 -10.0+ 50 || -4 -20.0+ 68 || -22 -30.0+ 86 || 40.0+ 104 31 -0.6+ 33 || 13 -10.6+ 51 || -5 -20.6+ 69 || -23 -30.6+ 87 || 40.6+ 105 30 -1.1+ 34 || 12 -11.1+ 52 || -6 -21.1+ 70 || -24 -31.1+ 88 || 41.1+ 106 29 -1.7+ 35 || 11 -11.7+ 53 || -7 -21.7+ 71 || -25 -31.7+ 89 || 41.7+ 107 28 -2.2+ 36 || 10 -12.2+ 54 || -8 -22.2+ 72 || -26 -32.2+ 90 || 42.2+ 108 27 -2.8+ 37 || 9 -12.8+ 55 || -9 -22.8+ 73 || -27 -32.8+ 91 || 42.8+ 109 26 -3.3+ 38 || 8 -13.3+ 56 || -10 -23.3+ 74 || -28 -33.3+ 92 || 43.3+ 110 25 -3.9+ 39 || 7 -13.9+ 57 || -11 -23.9+ 75 || -29 -33.9+ 93 || 43.9+ 111 24 -4.4+ 40 || 6 -14.4+ 58 || -12 -24.4+ 76 || -30 -34.4+ 94 || 44.4+ 112 23 -5.0+ 41 || 5 -15.0+ 59 || -13 -25.0+ 77 || -31 -35.0+ 95 || 45.0+ 113 22 -5.6+ 42 || 4 -15.6+ 60 || -14 -25.6+ 78 || -32 -35.6+ 96 || 21 -6.1+ 43 || 3 -16.1+ 61 || -15 -26.1+ 79 || -33 -36.1+ 97 || 20 -6.7+ 44 || 2 -16.7+ 62 || -16 -26.7+ 80 || -34 -36.7+ 98 || 19 -7.2+ 45 || 1 -17.2+ 63 || -17 -27.2+ 81 || -35 -37.2+ 99 || 18 -7.8+ 46 || 0 -17.8+ 64 || -18 -27.8+ 82 || -36 -37.8+ 100 || 17 -8.3+ 47 || -1 -18.3+ 65 || -19 -28.3+ 83 || -37 -38.3+ 101 || 16 -8.9+ 48 || -2 -18.9+ 66 || -20 -28.9+ 84 || -38 -38.9+ 102 || 15 -9.4+ 49 || -3 -19.4+ 67 || -21 -29.4+ 85 || -39 -39.4+ 103 ||

METERS FEET MILES METERS FEET MILES 100 328 0.1 12000 39370 7.5 200 656 0.1 12500 41010 7.8 300 984 0.2 13000 42651 8.1 400 1312 0.2 13500 44291 8.4 500 1640 0.3 14000 45932 8.7 1000 3281 0.6 14500 47572 9.0 1500 4921 0.9 15000 49213 9.3 2000 6562 1.2 16000 52493 9.9 2500 8202 1.6 17000 55774 10.6 3000 9843 1.9 18000 59055 11.2 3500 11483 2.2 19000 62336 11.8 4000 13123 2.5 20000 65617 12.4 4500 14764 2.8 21000 68898 13.0 5000 16404 3.1 22000 72178 13.7 5500 18045 3.4 23000 75459 14.3 6000 19685 3.7 24000 78740 14.9 6500 21325 4.0 25000 82021 15.5 7000 22966 4.3 26000 85302 16.2 7500 24606 4.7 27000 88583 16.8 8000 26247 5.0 28000 91864 17.4 8500 27887 5.3 29000 95144 18.0 9000 29528 5.6 30000 98425 18.6 9500 31168 5.9 31000 101706 19.3 10000 32808 6.2 32000 104987 19.9 10500 34449 6.5 33000 108268 20.5 11000 36089 6.8 34000 111549 21.1 11500 37730 7.1 35000 114829 21.7

Code Figure Definition --------------------------------------------------------- 00 Not allocated. 01-31: XX day of month (UTC) 32-39: Not allocated. 40-59: Reason for No Report / Incomplete Report 40 Report not filed 41 Incomplete report; full report to follow 42 Ground equipment failure 43 Observation delayed 44 Power failure 45 Unfavorable weather conditions 46 Low maximum altitude (< 600m/1500ft abv ground) 47 Leaking balloon 48 Ascent not authorized for this period 49 Alert 50 Ascent did not extend above the 400hPa level 51 Balloon forced down by icing condition 52 Balloon forced down by precipitation 53 Atmospheric interference 54 Local interference 55 Fading signal* 56 Weak signal* 57 Preventive maintenance 58 Flight equipment failure (transmitter, balloon, attachments, etc.) 59 Any reason not listed above * Fading signals differ from weak signals in that they are first received satisfactorily, then become increasingly weaker, and finally become too weak for reception, while "weak signals" are weak from the beginning of the ascent. 60-64: Miscellaneous 60 Unassigned 61 Unassigned (Aerometeorograph report precedes) 62 Radiosonde report precedes 63 Unassigned 64 Unassigned (Stability Index follows...000isis) 65-69: Doubtful (and Missing) Data 65 Geopotential(Altitude) and temperature data are doubtful between following levels: 0PnPnP'nP'n 66 Geopotential(Altitude) data are doubtful between the following levels: 0PnPnP'nP'n 67 Temperature data are doubtful between the following levels: 0PnPnP'nP'n 68 Dew point depression is missing for reasons other than "motor-boating" between the following levels: 0PnPnP'nP'n (Not used when TnTn is also missing) 69 Unassigned 70-74: Not allocated.

Code Figure Definition --------------------------------------------------------- 75-89: Corrected Data 75 Unassigned 76 Unassigned 77 Unassigned 78 Corrected tropopause data section follows 79 Corrected maximum wind section follows 80 Corrected report for the entire report (first* and second* transmissions) precedes 81 Corrected report of the entire first transmission precedes 82 Corrected report of the entire second transmission precedes 83 Corrected data for mandatory levels** follow 84 Corrected data for significant levels** follow 85 Minor error(s) in this report; correction follows 86 Significant level(s) not included in original report follow: //PnPnPn TnTnTanDnDn or PnPnPnTnTn 87 Corrected data for surface follow 88 Corrected additional data groups follow: 101AdfAdf .... etc. 89 Unassigned 90-99: 90 Extrapolated geopotential data follow: PnPnhnhnhn (dndndnfnfn) 91 Extrapolated data precede * 92 Unassigned 93 Unassigned 94 Average wind for the surface to 5000 ft MSL layer and the 5000 to 10000 ft MSL layer follow: ddfff ddfff (can be used in the Part A message) 95 Early transmission of 850 and 500 hPa data and stability index follows: 85hhh TTTaDD ddfff 50hhh TTTaDD ddfff isis 96 Early transmission of 850, 700, and 500 hPa data and stability index follows: 85hhh TTTaDD ddfff 70hhh TTTaDD ddfff 50hhh TTTaDD ddfff isis 97 Early transmission of 500 hPa data and stability index follows: 50hhh TTTaDD ddfff isis 98 Early transmission of 700 hPa data and stability index follows: 70hhh TTTaDD ddfff isis 99 Not to be allocated Code figure 91 is used only in reports of dropsonde observations. Unless both the stability index and the mean winds are missing, the Part A message always contains two special 101 groups as follows: 10164 Group that identifies stability index. 10194 Group that identifies the mean winds. A 5-character group follows the 10164 which contains the encoded stability index. The value that appears in the coded message for stability index is interpreted as follows: Coding Stability Index Code Meaning Value 00-40 Stability index is 0 to 40 51-90 Stability index is -1 to -40 91 RH < 20% at either base or 500 hPa level or calculation failed. 92 RH is missing at the base level.

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