Thursday 24th February
Dan Johnson

1600 Leave WISP operations center.  On this mission is Dan
Johnson  and John Cardwell

1725 We are on hwy. 14 heading east towards Briggsdale.  We are
     about 6 miles east of Ault, see dust blowing when looking 
     north.  Winds are switching to the north and blowing hard.
     The front has just passed

1735 Arrive at initial site.  This is 10 km west of Briggsdale on
hwy. 14 at 65 Rd.  We have placed the van about .5 km north of hwy.
14 on 65 Rd.  This is 27.2 km from the CHILL radar at 34 degrees.
Winds are very strong and gusty from the north.  Winds are
a sustained 30-40 mph.  There is an east-west line of dark clouds 
probably producing snow about 20-30 km to the north of us. 
It appears to be moving towards us and should be here in 30
mins to an hour.

1810 The line of clouds to the north of us is moving mostly in an
     easterly direction and not much towards the south.  We will
     pack things up at this site and move NE of here about 10-15km.

1819 We leave the site west of Briggsdale

1842 ARRIVE AT NEW SITE 1.5 km west of the intersection of 83 Rd.
     and 100 Rd. This is 8.5 km NNE of Briggsdale or 41.5 km from
     the CHILL radar at 42.6 degrees.  Winds are very strong from
     the north at 30-40 mph.  It will be very difficult to catch
     samples with gusts of 50-60 mph.  The latitude and longitude
     for this position is 40 degrees 42' and 44" and 104 degrees
     17' and 28" respectively.

1854 From visual observations, there are very small crystals
     which appear to be heavily rimed stellars.

1901 Filter sample #1 begins.  Flow rate is 1.5 l/min.

1905 Take photos of calibration slides

1910 Snow sample #1:
          Fern-like dendrite

1918 Snow samples #2 and #3:
          Heavily rimed stellars
          Graupel particle

1923 Snow sample #4 - it is hard to determine crystal types.
          Graupel particles
          Plates

1924 Snowfall is increasing in intensity

1930 Snow sample #5:
          Large dendritic branch

1946 Filter sample #1 ends.  Total flow through filter was 67.5 l.

1948 Filter sample #2 begins.  Flow rate is 1.5 l/min.

1950 Can see the moon nearly fully.  See some breaks in the clouds.
     We must be on the southern side of the snow band?  Winds are
     very strong from the north still, about 30-40 mph sustained.
     Tried to take a chemistry sample with the bag but was futile
     with the extremely strong wind. Van is shaking from the wind.

1956 Snow sample #6:
          Plate on edge of dendrite crystal
          Broken off stellar with needles on end.  Unrimed
          Dendrite with 2 points to it

2004 Snow is increasing in intensity. Not much accumulation on
ground but the winds are blowing the snow all over.

2017 Snow sample #7:
          Bullet with plate extending from it
          Very heavily rimed dendrite - almost has lost itsidentity
          Rimed branch and a stellar
          Graupel particle
          Very large fern dendrite
          Very large and heavily rimed stellar about 4 mm diameter

2035 Filter sample #2 ends.  Total flow through filter was 70.5 l

2043 Now cannot see the moon very well.  Snow is coming down even
     more heavily.  Some visibility reduction is due to the blowing
     snow

2048 Snow crystals now are larger and more well defined than the
ones we observed earlier.
     Snow sample #8:
          Stellar-like branch not rimed
          Rimed dendrite
          Very heavily rimed branch, nearly graupel
          Heavily rimed crystal or graupel particle - can see
               light through it

2100 Leaving the site 8.5 km NE of Briggsdale and are heading
towards the K-band site for a few samples.

2240 Arrive at the K-band site to get a couple of samples.  Winds
are light, snow is falling lightly.  From visual observations
on the black board there are stellars 1-3 mm diameter and
aggregates 5-10 mm diameter.

2245 Take calibration photo

2248 Snow sample #1 at K-band:
          Unrimed dendritic branches
          Graupel particle on a dendritic branch
          Plate with little plates on its edge
          Stellar with no rime

2252 Snow sample #2:
          Very large stellar about 4 mm in diameter with
               graupel in its branch
          2 mm dendrite with needles observed also
          Dendrite

2257 Snow sample #3:
          Stellar with small graupel in branch
          Stellar/dendrite

2302 Snow sample #4:
          Large dendrite about 3 mm in diameter.  Dendrite
               has small graupel or heavily rimed particle
               in a branch
          
2309 Finish from the K-band site and are heading back to NCAR.