The Third Storm of the Winter of 2006-2007
Snowstorms of This Winter-Click here Snowstorms of Past Winters-Click here
Obs. Num. Time of Observation February
13   2007
Total Frozen Precip. Inches Total Melted Precip. Inches Temp. F Remarks for the Time Period
   0      0310 hrs.    0.0   0.00   35.4   Very fine and light snow started as flurries.
   1      0700 hrs.   0.1  0.01  33.3  Light snow now and the lawn is starting to get white and the temperature has dropped near freezing now.
   2      0800 hrs.    0.1  0.02  33.1   By 0710 the light snow turned into a very small sleet particles and some snow particles that are broken needles and irregular. Precipitation then turned back into very light snow and with some melting there was no additional snow accumulation.
   3      0900 hrs.   0.3  0.06  32.6   By 0810 the precipitation turned back to all snow and for about five minutes around 0820 the rate was light to moderate. By 0830 the precipitation was broken snow crystals show light to moderate riming of the snow crystal fragments. From 0850 to 0900 the snow became very light and turned into a very small sleet particles mixed with snow particles that were irregular broken fragments.
   4      1000 hrs.   0.5  0.08   31.7   By 0910 there were some larger aggregate flakes of crystals mixed in with the finer particles and lasted a little less than ten minutes. By 0920 the snowfall rate increased from very light to light and continued light through 0935. At 0940 some larger aggregate flakes started mixing in with the smaller particles and the temperature has fallen to below freezing now.
   5      1100 hrs.   0.7  0.11  30.7   At 1010 the snowfall rate increased from a light rate and became light to moderate with larger aggregate flakes becoming the rule until 1020 then smaller flakes became the rule. At 1030 the rate became very light again and by 1045 was extremely light. Precipitation had all but stopped by 1050 through 1100.
   6      1200 hrs.   0.7  0.12  29.5   Precipitation almost stopped during the past hour only a light flurry around 1110 that lasted 5 minutes then some light sleet and a little freezing rain during the last half hour no additional accumulation but colder than last hour !
   7      1300 hrs.    0.7  0.13   27.7  Very little precipitation except in the last 15 minutes of the hour which was in the form of sleet as the temperature continues to fall !
   8      1400 hrs.    0.7  0.13   27.8   Very little precipitation this past hour.
   9      1500 hrs.    0.8  0.16  26.7  Sleet during the past hour at mostly a constant but light intensity rate.
  10    1600 hrs.    0.8   0.19   27.1  Sleet during the past hour was constant but generally light but occasionally a moderate rate.
  11   1700 hrs.    0.9  0.21  26.8  Sleet and some freezing drizzle this past hour -
  12    1800 hrs.   0.9  0.21  26.7  No measurable precipitation this past hour -
  13    2000 hrs.   0.9  0.21  26.7  Some very light precipitation but not enough to measure in the past two hours.
  14    2100 hrs.    0.9   0.23  26.2   Mixed sleet and a little freezing drizzle but more sleet than drizzle.
  15    2200 hrs.   0.9  0.25  25.4   Freezing drizzle was the main type of precipitation during the pass hour. Heavier precipitation is expected after 2400 but it should be in the form of freezing rain.
  16    2300 hrs.    0.9  0.26   25.1   The sleet has turned in to snow in the form of small particles of graupel showing heavy riming. We have some heavy precipitation that should be arriving by 2400.
  17    2400 hrs.    0.9   0.26   25.6   Not much precipitation falling in this hour except a frozen drizzle. The heavier precipitation is now just entering southern Fairfax County.
  18 Feb.
14   2007
  0100 hrs. 
 1.2  0.33   26.1   The heavier precipitation arrived around 0030 and was in the form of sleet. Currently moderate to heavy intensity of sleet.
  19    0200 hrs.   1.3  0.44   25.5   Light to moderate sleet has been falling most of the past hour.
  20    0900 hrs.    2.7  1.19  31.6   Heavy sleet intensity between 0400 and 0600. It took a lot of hot water to melt the the sleet in the gauges to get the liquid amount of precipitation. This sleet, snow and ice will take a long time to melt particularly in the shadows.