Saturday 15th March
Praying
for polar lows
Weather Outlook: Possible polar lows moving south from near
Flight plan for tomorrow: Measure
fluxes near
Blog
Well first
thing this morning it was pretty miserable here. The only polar low visible in the satellite
images was in the Russian sector, and it looked to be staying put there. It also spent the greater part of the morning
raining – the first time it’s been warm enough for the precipitation to fall as
rain not snow. I had my ‘end of campaign
interview’ with Astrid and Frode before lunch. I still hate being put on the spot although
Astrid is a friendly interviewer and tries to make it easy for you. The documentary that they are making about
our hunt for a polar low will be broadcast on Norwegian television around
Christmas time, so hopefully none of you will see it (just kidding of
course). I don’t think any of us knew
what to expect having a documentary crew here, but we’ve really enjoyed having
them around. Everyone here is so
impressed at how much knowledge about the weather that they’ve picked up in a
short time, and how enthusiastic they’ve been about our project. They have also been very unobtrusive, and most
of the filming has been during briefings.
It will be interesting to see the result of their hard work.
Today we
had two flights, one up to
The flight
planning meeting this evening concluded with a decision to fly two flights
tomorrow. The first will go up towards
Our
campaign, or ‘three-week spending spree’ as Gudmund
called it (field campaigns are expensive), is nearly over. Tomorrow will see the last flights of the
campaign, and will also see the departure of much of the science crew,
including myself. Only Jon Egill, Gudmund, Øyvind and the DLR crew will stay the night, departing on
Monday for their various corners of
Weather Round-up
All of the
forecasts that we’ve looked at this morning (UKMO global, GFS, ECMWF, HIRLAM) show transient cyclonic features in the mslp. None of them
have anything developing though, despite the ingredients for polar low
formation being present. We have wind
shear, upper-level forcing (PV anomaly), 47degC
temperature difference between the surface and 500hPa and initial disturbances
in the pressure field. Looking out the
window, we have shallow convection, as the cold-air outbreak is still confined
to the western regions of the Norwegian seas, and hasn’t really come as far
east as us yet. In the satellite images
there is no deep open cell convection organised into cloud streets associated
with the cold air outbreak yet. There is
a small feature in the
This
evening’s forecasts don’t show any more development of the low pressure systems
to the south-west of
SAP Evaluation
The SV SAPs for 12 and 24hrs optimisation have the region of
maximum sensitivity within the verification region, around an area of low
pressure. For an optimisation time of
36hrs the region of maximum sensitivity is split between the southern part of
the verification region and northern half, extending into the
The ETKF SAPs for 12hrs optimisation extend north between Andøya and Svalbard, as far east as the