July 2, 13:38 CDT
Dan Rajewski (in Ames)
Summary: Stations 1-4 operational, no ISFS staff on site
CORRECTION: krypton hygrometer and possibly sonic at stn4 need replacement due to electrical harmonic 'noise'
thunderstorm event around 0:15 CDT, followed by cold front passage
light winds from the NW to NE early morning through afternoon
Vdsm: 13.5-13.8 V during day, down to 12.4 at night
P: ok, pressure in close agreement among all sites
T.2m: ok, all stns in agreement
RH.2m: 60-65% during thunder storm passage; 90-95% before sunrise; stns 1-3 few %RH less than stn 4
50-60 % during day; stns 1-3 lower than stn 4
H2O.2m: night: stns 1-2 are ~1 g/m^3 less than stns 3-4
day: stns 1-3 are ~1 g/m^3 less than stn 4
Wetness: wetness detected around 0:15, sensor dry by 7:45 CDT
T.10m: ok,
RH.10m: ok, 85-93% stn 4 nightime RH few% less than stns 1-3;
afternoon RH ~55% at all sites
H2O.10m: ok, before front passage stn 3 slightly higher than 1-2,4
daytime stn 4 1 g/m^3 less than stns 1-3
Spd.10m: ok, all stns have similar magnitudes of speed
Dir.10m: ok, stn 2 sensing more fluctuations around the 360 degree mark than for sites 1,3-4
T.10m - T.2m: ok, diurnal cycle as expected, very similar at all sites
H2O.10m - H2O.2m: all sites about -2 g/m^3 (more moist near sfc) for daytime
spd.4.5m: ok, see comments for Spd.10m
dir.4.5m: ok,
w.4.5m: ok, after front passage with westerly wind all stns have w~ 0;
before sunrise sites 1-2 w<0 and sites 3-4 slightly w>0
pattern continues as winds veer from NW to NE in the afternoon
tc.4.5m: ok, stn 4 slightly warmer (0.5 degree) than stn 1
ldiag: ok
vh2ov: 50 mV before storm, above 100 mV for remainder of overnight-afternoon
kh2o: ok, front passage dropped the moisture from 21 to 14 g/m^3
h2o(licor): ok, in daytime stn1 > stn 3 (0.5 g/m^3)
lidiag (licor): ok
TKE.4.5m: ok, slight periods of stn1 higher than other sites (4:30-6:00, 9:30-10:30) other blips in early afternoon
w'w': ok, see comment for TKE (stn1 is experiencing turbine wakes for northerly flow?)
w'h2o': ok, spike in data during thunderstorm storm passage; all stns in close agreement for northerly flow
h2o'h2o': ok, spike in data during thunderstorm passage
kh2o'kh2o': not ok; anomalous variance continuing in overnight at stn 4; though less 'noisy' than previous day (watch for future cases of strong wind to cause greater erroneous readings?)
w'co2': ok, stn 1 & 3 are in close agreement most of night and in daytime
co2'co2': ok, large variance and change of concentration during storm & frontal passage