Climatological Data: National summary, Volume 18

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U. S. Department of Commerce, National Oceanic and Atmospheric Administration, Environmental Data Service, 1967 - Meteorology
 

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Page v - Amount of mean monthly snowfall is computed for Weather Bureau stations having at least 10 years of record. B. Shows depth currently on ground at 7:00 am EST, of the Monday nearest the end of the month. It is based on reports from Weather Bureau and cooperative stations. — //////^~ ~ 7*^' " "
Page dxcviii - A. Amount of mean monthly snowfall is computed for Weather Bureau stations having at least 10 years of record. B. Shows depth currently on ground at 7:00 am EST, of the Monday nearest the end of the month. It is based on reports from Weather Bureau and cooperative stations. Chart VI. A. Percentage of Possible Sunshine, April 1966. В. Percentage of Mean Monthly Sunshine, April 1966. / ) '•• fT" v^x =bZ= =Рч.^ ,( \ +4 /=*ч M A.
Page i - Langley is the unit used to denote one gram calorie per square centimeter. An explanation of the formula used In computing the air mass value* for each station appears in the February 1957 issue.
Page cdlxxxviii - A. Computed from total number of hours of observed sunshine in relation to total number of possible hours of sunshine during month. B. Means are computed for stations having at least 10 years of record. Chart VII.
Page iv - The average monthly sea level pressures are obtained from eight daily 3-hourly observations reported at Weather Bureau Stations. Resultant surface wind directions (to 36 points of the compass) for the month are shown by arrows. Resultant speeds are in miles per hour and are indicated by the length of arrow shafts. Constancy ratios (resultant surface wind divided by average surface wind for month) are shown to two decimal places. The inset shows the departure of the average pressure based on 30-year...
Page iv - TRACKS OF CENTERS OF ANTICYCLONES AT SEA LEVEL. CHART IX. TRACKS OF CENTERS OF CYCLONES AT SEA LEVEL. Centers which can be identified for 24 hours or more are tracked in these charts. Semipermanent features such as the Great Basin and Pacific Highs and Colorado and Mexico Lows are not shown. The 7:00 am EST positions are shown by open circles, with the Intermediate positions at 6-hour intervals shown by solid dots. The date is given above the circle and the central pressure to whole millibars below....
Page iv - Arrows show resultant wind direction. Winds are based on rawins at the indicated pressure surface and at 1200 GMT. Exact values of most of these charted elements for Weather Bureau stations are printed each month in tabular form in CLIMATOLOGICAL DATA, NATIONAL SUMMARY. Extreme values of temperature and precipitation for each state are included in the tables.
Page lix - A. Mean daily solar radiation, direct + diffuse, received on a horizontal surface in langleys (1 langley = 1 gm. cal. cm. -! ) and recorded in International Pyrheliometer Scale of 1956. B. Percentage of the mean based on at least 5 years of record during the period 1950-60, and corrected to the International Pyrheliometer Scale of 1956. • : •\ v,. • k\ -•:-v 'х--. -А',. : : A
Page xxiii - Summary apply to the period 24 hours prior to time of observation. In some cases the actual occurrence is on the calendar date preceding that shown, (See individual Climatológica! Data for times of observations). D Water equivalent of snowfall wholly or partly estimated, using a ratio of 1 inch water equivalent to every 10 mrhes of snowfall. Section Temperature Monthly extrem** FMlpiblla. Alabama Alaska Arizona Arkansas Monthly extreme« Station } •F Л Station ] •F 3 Station Greatest In.
Page xxxix - All Others," and for detailed listing of other storms, see the Environmental Data Service, NOAA, monthly publication STORM DATA.

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