graphs: precipitation types
TRANSCRIPT
I I.30
Map 2. Wind/visibility/cloudiness
BLACK LINE - Percent frequency of optimum conditions: Low cloud ceiling (LCC) 25000 feet,(or no LCC), visibility 25 nautical miles and wind 11-21 knots.
BLUE LINE - Percent frequency of poor conditions. Any one of the following constitutes poorconditions: LCC <300 feet, visibility <l nautical mile or wind <6 or 234 knots.
Albers Equal-Area Conic Projection
Graphs: Precipitation types
2 5
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Percent frequency of precipitation by type and intensity(S - slight, M - moderate and H- heavy).
_ - - - - - - Number of observations.
Bars show percent frequency of observationsreporting Precipitation of various types andintensities.
- - - - - - - - 0 indicates no observations in the category
_-----__ >k indicates <.05% but >O.-_-- - - (4% of all observations recorded moderate
to heavy precipitation.)
s M-H 5 M-H s U-H s M-H 5 M - H PlLL
D R I Z Z L E RAIN SNOW S H O W E R S A L L PCPN
Present weather elements that can be reported in an observation are thunderstorms, lightning, waterspouts, squalls, fog,haze, smoke, dust, and all forms of precipitation. Most present weather codes (ww = 00-99, see table) apply to phenomena occur-ring at the time of observation, but a few refer to phenomena occurring in the past hour. The highest applicable numerical wwcode figure is recorded (except that code 17 has preference over 20 to 49, inclusive). Precipitation includes all forms of water par-ticles, whether liquid or solid, that fall to the earth’s surface -rain, drizzle, snow, snow pellets, snow grains, ice crystals, icepellets, and hail. Each form is classified by its character (continuous, intermittent, showery, or combination), intensity (slight,moderate, or heavy), and type (liquid, freezing, or frozen). In this study, frozen precipitation is defined as any precipitation thatreaches the ground in frozen form; it does not include liquid that freezes upon impact with the ground or exposed objects. Referto the text in Set 1 for additional information on precipitation.
2 Legend Legend 2
II-31
PRESENT WEATHER (WMO Code, 1982)
The present weather (ww) code is arranged in priority order. Reading down the list, select the firstapplicable (most severe) weather condition that you observe and enter the code number for ww.
50.99 PRECIPITATION AT SHIP AT TIME OFOBSERVATION
95-99 THUNDERSTORM AT TIME OF OBSERVATION
9 9 Heavy thunderstorm with hail*9 8 Thunderstorm with duststorm or sandstorm9 7 Heavy thunderstorm with rain and/or snow,
but no hail*9 6 Slight or moderate thunderstorm with hail*9 5 Slight or moderate thunderstorm with rain OI
snow. but no hail’
‘Includes hail, ice pellets, or snow pellets
91.94 THUNDERSTORM DURING THE PAST HOUR BUTNOT AT THE TIME OF OBSERVATION
Note: Use code 29 if there is no precipitation at time ofobservation.
9 4 Moderate or heavy snow, or rainand snow mixed, or hail’
9 3 Slight snow, or rain and snowmixed, or hail’
9 2 Moderate or heavy rain91 Slight rain
‘Includes hail, ice pellets, or snow pellets
Thunderstorm’ in past
hour
85-90 SOLID PRECIPITATION IN SHOWERS
Slight Moderate or Heavy8 9 Shower or hail’, no thunder 9 08 7 Shower of snow pellets or ice pelletst 8 88 5 Shower of snow 8 6
tWith or without rain, or rain and snow mrxed*Include hail, ice pellets, or snow pellets
1 7 Thunder at time of observation, no precipitationat ship
40-49 FOG AT TIME OF OBSERVATION
(Visibility in fog is less than % nautical mile) 04.09 HAZE, DUST, SAND, OR SMOKE
80.84 RAIN SHOWERSSky Sky
8 4 Shower of rain and snow mixed, moderate or heavy8 3 Shower of rain and snow mixed, slight8 2 Violent rain shower8 1 Moderate or heavy rain shower8 0 Slight rain shower
70-79 SOLID PRECIPITATION NOT FALLING AS SHOWERS
visible invisible4 8 Fog, depositing rime 4 94 6 Fog, has begun or thickened in past hour 4 74 4 Fog, no change in past hour 4 54 2 Fog, has become thinner in past hour 4 34 1 Fog in patches4 0 Fog at a distance but not at ship in past hour
30-39 (Not likely to be used in ship reports)
7 9 Ice pellets Slight or7 8 Isolated star-like snow crystals(with or without fog) moderate7 7 Snow grains (with or without fog) 38 Blowing snow, high (above eye level)7 6 Diamond dust (with or without fog) 3 6 Drifting snow, low (below eye level)
Intermittent Continuous7 4 Heavy snow in flakes 7 57 2 Moderate snow in flakes 7 37 0 Slight snow in flakes 71
60-69 RAIN (NOT FALLING AS SHOWERS)Slight6 8 Rain or drizzle with snow6 6 Freezing rain
Intermittent6 4 Heavy rain6 2 Moderate rain6 0 Slight rain
50.59 DRIZZLE
Slight5 8 Drizzle and rain mixed5 6 Freezing drizzle
Intermittent5 4 Heavy drizzle5 2 Moderate drizzle5 0 Slight drizzle
Moderate br Heavy6 96 7
Continuous6 56 36 1
Moderate or heavy5 95 7
Continuous5 55 35 1
00.49 NO PRECIPITATION AT SHIP AT TIME OFOBSERVATION
H e a v y3 93 7
3 2 Duststorm or sandstorm, increasing 3 53 1 Duststorm or sandstorm, unchanging 3 43 0 Duststorm or sandstorm, decreasing 3 3
2 9 Thunderstorm, with or without precipitation2 8 Fog (in past hour but not at time of obs.)2 7 Shower(s) of hail’, or of hail*, and rain mixed2 6 Shower(s) of snow, or of rain and snow mrxed2 5 Shower(s) of rain2 42 32 22 12 0
20-29 PHENOMENA IN PAST HOUR BUT NOT ATTIME OF OBSERVATION
Freezing drizzle or freezino rain \Rain and snow mixed, or ice pelletsSnow
I
Not falhng
Rain (not freezing) as showers
Drizzle (not freezing) or snow grains
*Includes hail, ice pellets or snow pellets
18-19 SQUALLS, FUNNEL CLOUDS
1 9 Funnel cloud(s) seen in past hour or at time of obs.1 8 Squalls (no precip.) in past hour or at time of obs.
13-16 PHENOMENA WITHIN SIGHT BUT NOT AT SHIP
1 6 Precip. within 3 naut. mi.-reaching surface1 5 Precip. beyond 3 naut. mi.-reaching surface1 4 Precipitation in sight, not reaching surface1 3 Lightning visible, no thunder heard
1 21 11 0
lo-12 MIST AND SHALLOW FOG Fog notShallow fog-more or less continuous
1deeper
Shallow fog in patches than 10 mMist (Visibility % nautical mile or more) (33 feet)
0 90 80 70 60 50 4
Duststorm or sandstorm within sightDust whirls in past hour (NOT FOR MARINE USE)Blowing spray at shipWidespread dust suspended in the airDry hazeVisibility reduced by smoke
00.03 CHANGE OF SKY DURING PAST HOUR
Codefigs.0 3 Clouds generally forming or developing0 2 State of the sky on the whole unchanged01 Clouds dissolving or becoming less developed0 0 Cloud development not observable
2 Legend Legend 2
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August 2 Precipitation Types
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