Preparing for the 2015-16 OLYMPEX Field Campaign: Challenges of observing heavy rain and snow in remote regions of the Olympic Mountains Joe Zagrodnik.

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Presentation transcript:

Preparing for the OLYMPEX Field Campaign: Challenges of observing heavy rain and snow in remote regions of the Olympic Mountains Joe Zagrodnik Lynn McMurdie, Robert Houze University of Washington Pacific NW Weather Workshop Feb 27, 2015

Ideal ground site… Olympic Mountains site…

Ground Site Criteria Science objectives Permission – National Park Service – Quinault Indian Nation – National Forest Service – Fish and Wildlife Service – NOAA – WS DOT – Local Government – Private Landowners Accessibility Communication Electricity Vegetation Security

Ground Site Locations

Snoqualmie Pass Trailer Test Deployed Nov 4, 2014 Simulating high altitude, no power conditions

Questions to answer – How long can the batteries last? – Can instruments operate on batteries without heating element? – Do the instruments make accurate and useful microphysical measurements? – How often is maintenance needed?

Q: How long can the battery last? (Set of 8 deep-cycle batteries W solar panel) Sunny periods A: About one month if no sun, all winter if there are sunny periods

Q: Can instruments operate on batteries without heating element? Parsivel disdrometerPluvio bucket

Accumulated Precipitation Chunk of snow drops in bucket Red: Pluvio (bucket) Blue: Parsivel (disdrometer) NW Avalanche Center: mm

Q: Can instruments operate on batteries without heating element? *Currently having issues with condensation inside of Parsivel head. Attempting to use silica gel desiccant packets to remove moisture. Preliminary results are encouraging. A: Usually*

Do the instruments make accurate and useful microphysical measurements? Case Study: Jan 18, 2015

Frontal cyclone crossing a mountain range Medina et al. (2007) Prefrontal Observed as frontal sector crosses topography Postfrontal precipitation broadened by orographic uplift

IR Satellite Jan 18, 2015 Prefrontal: Jan UTC Frontal: Jan UTC Frontal: Jan UTC

KATX Radar Prefrontal: stratiform precipitation Frontal: Increase in intensity Postfrontal: shallow, convective showers

Reflectivity and Precip Accumulation Prefrontal Frontal Postfrontal

Particle Size Distribution Prefrontal Frontal Postfrontal

Q: Can Instruments make accurate and useful microphysical measurements? A: Yes! Q: How often is maintenance needed? A: Every 3 weeks or so

Thank you! Follow us on Trailer test data is available at the following URL (or for link): Today at Snoqualmie Pass (through 10 AM):

Extra Slides

Management Needs Type # Sites Visit FrequencyData RetrievalAccess Issues Low elevation with power 44-6 weeks, as neededCell- Low elevation, no power 41-2 weeks, as neededSite dependentMudslides High elevation with Power* 21-2 weeks, as neededCell Snow, road closures High Elevation, no power 21-2 weeks, as needed? No vehicle access *Includes Hurricane Ridge

Accessibility US-101 Paved Road Maintained Dirt Road Unmaintained Dirt Road 13-mile backcountry trail Unmaintained after Oct-1 Mudslides likely Snow, mudslides possible