29.01.2015 Views

Table of Contents - The Atmospheric Studies Group at TRC

Table of Contents - The Atmospheric Studies Group at TRC

Table of Contents - The Atmospheric Studies Group at TRC

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Section 7: Prognostic Meteorological Interfaces<br />

7.2 CALETA Preprocessor<br />

CALETA oper<strong>at</strong>es on the output from the N<strong>at</strong>ional Centers for Environmental Prediction (NCEP)<br />

oper<strong>at</strong>ional North American Mesoscale (NAM) model, formerly known as the Eta model, and the highresolution<br />

simul<strong>at</strong>ion products from the We<strong>at</strong>her Research and Forecasting (WRF) model.<br />

Eta/NAM/WRF model output files are produced for use by the Advanced We<strong>at</strong>her Interactive Processing<br />

System (AWIPS) in various AWIPS grids. Gridded model output is stored in GRIB form<strong>at</strong>, and consists<br />

<strong>of</strong> analysis and forecast fields for multiple parameters and levels. CALETA extracts and reform<strong>at</strong>s a<br />

subset <strong>of</strong> these fields, and cre<strong>at</strong>es a 3D.DAT file for CALMET (see section 7.5).<br />

Several d<strong>at</strong>asets are available, corresponding to AWIPS grids th<strong>at</strong> cover the United St<strong>at</strong>es <strong>at</strong> various<br />

sp<strong>at</strong>ial resolutions:<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

AWIPS Grid 212 -- Continental U.S., 40km (NAM)<br />

AWIPS Grid 218 -- Continental U.S., 12km (NAM)<br />

AWIPS Grid 245 -- Eastern U.S., 8km (WRF)<br />

AWIPS Grid 246 -- Western U.S., 8km (WRF)<br />

AWIPS Grid 247 -- Central U.S., 8km (WRF)<br />

AWIPS Grid 248 -- Puerto Rico, 8km (WRF)<br />

AWIPS Grid 249 -- Alaska, 10km (WRF)<br />

AWIPS Grid 250 -- Hawaii, ~8km (WRF)<br />

Maps <strong>of</strong> these domains are reproduced in Figures 7-4 and 7-5. Due to large size <strong>of</strong> files, the AWIPS 218<br />

domain is processed into 54 tiles shown in Figure 7-6. Characteristics <strong>of</strong> each <strong>of</strong> these AWIPS grid<br />

products are summarized in <strong>Table</strong> 7-10. For AWIPS 212, 218, and 245, the vertical resolution is 25 hPa<br />

from 1000 hPa to 50 hPa, for a total <strong>of</strong> 39 levels. Nine vertical levels are available (1000, 925, 850, 700,<br />

600, 500, 400, 300 and to 200 hPa.) for the other AWIPS grids.<br />

<strong>The</strong> run frequency is four times per day for AWIPS 212 and 218, <strong>at</strong> initial hours <strong>of</strong> 00, 06, 12, and 18<br />

UTC. It is once per day for AWIPS 245, 246, 247, and 249; and twice per day for AWIPS 248 and 250.<br />

<strong>The</strong> initial time is 00 UTC for Alaska (AWIPS 249), 06 UTC for the western US (AWIPS 246), 12 UTC<br />

for the central US (AWIPS 247), and 18 UTC for the eastern US (AWIPS 245). <strong>The</strong> initial time is 00, 12<br />

UTC for Hawaii (AWIPS 250) and 06, 18UTC for Puerto Rico (AWIPS 248).<br />

7-26

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!