Description Of Hourly Observations

Observations are made each hour by automated equipment.  The data is listed in columns.

DaTime identifies the day of the month and time.  A 24 hour clock is used. The hours listed are in UTC.
subtract 5 hours to convert this to EST.

Standard abbreviations used.

Clouds shows the sky condition and cloud layers.
     CLR means no clouds below 12 thousand feet.
     FEW means few (less than 1 tenth sky cover)
     SCT means scattered clouds (1 tenth to 5 tenths sky cover)
     BKN means broken clouds (6 tenths to 9 tenths sky cover)
     OVC means overcast (10 tenths sky cover)
     VV  indicates the vertical visibility into fog or snow.

Numbers following the cloud amounts are the heights of the clouds above the ground in hundredths of feet.
005 is 5 hundred feet.  100 is 100 hundred feet or 10 thousand feet.

Vsby is the visibility in statue miles.  Visibilities are in whole miles when the visibility is 3 miles or more.
Fractions of miles are used when the visibility is below 3 miles.  For instance 1 1/2 is one and one half miles.

Common weather abbreviations.

BR Light fog   FZ Freezing
FG Thick fog   TS Thunderstorm
DZ Drizzle     IP Ice Pellets
RA Rain        UP Unknow precipitation type
SN Snow

Weather intenisty.
-       Light
+       Heavy
/       Missing or separator

Temp is the air temperature in degrees Fahrenheit.

DP is the dew point in degrees Fahrenheit.

Wind is given in tens of degrees and knots.  One knot is 1.15 miles per hour.  Degrees are with respect to
true north.  09 is a wind from the east,  18 is a wind from the south, 27 is a wind from the west.

GS is the wind gusts in knots during the last 10 minutes.

PW is the peak wind in knots uring the past hour.

SLP is the sea level pressure in millibars with the leading 9 or 10 omitted.  132 is 1013.2 millibars.
932 is 993.2 millibars.

1 Hr is the amount of precipitation in hundredths of an inch measured since the start of the last hour.
000 means less than .01 inch precipitation.

6 Hr is the amount of precipitation in hundredths of an inch measured since the starting of the previous
6 hour period.  These standard hours are 00 UTC, 06 UTC, 12 UTC, and 18 UTC.

24 Hr is the amount of precipitation in hundredths of an inche measured during the past 24 hours.

Mx is the highest temperature in degrees Fahrenheit in the past 6 hours.

Mn is the lowest temperature in degrees Fahrenheit in the past 6 hours.