A deterministic postprocessing program for an Automatic Weather Interpretation

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A deterministic post-processing program for
anAutomatic Weather Interpretation

Italian Meteorological Service (UGM / CNMCA)

• Fabrizio Ciciulla

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Contents

• Introduction
• Architecture of AWI program
• Case studies
• Planned developments

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Introduction
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For an operational forecaster its important
to rely on automatic technical procedures in the
numerical model output fields analysis and
interpretation.
Such a guidance tool will describe the
numerical model output in a synoptical way and
will suggest the possibility of occurence for
weather events like fog, drizzle, showers or
thunderstorms.
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At this end the Italian Air Force
Meteorological Service is renewing its
post-processing operating procedures realizing
such an objective and automatic interpretation of
numerical model output fields by means of a
program called AWI (Automatic Weather
Interpretation).
The original idea for such a program
derives from the automatic weather interpretation
scheme developed by DWD.
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• AWI Post-Processing of LM fields DWD

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Architecture of the AWI program
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• Design choices
• Use of standard format for I/O (in order to let a
  possible exchange of the product)
• GRIB (input) (LAMI, italian version od LM,
  produced by CINECA with BC from GME)
• BUFR (output) (as a forecast pseudo-synops
  dataset)
• Use of a scheme adapted to WMO regulations
• Weather phenomena distinguished
• Fog (with and without rime ice)
• Drizzle (also freezing)
• Rain-fall (slight, moderate, heavy / freezing)
• Snow-fall (slight, moderate, heavy)
• Snow-showers (slight, moderate to heavy, violent)
• Rain-showers (slight, moderate to heavy, violent)
• Thunderstorm and heavy thunderstorm

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AWI
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GRIB reading
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WW
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FOG
Conditions
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SNOW - 1
Conditions
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SNOW - 2
Phenomena

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THUNDERSTORM
Conditions
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Case Studies
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Case 1 11 12 March 2003
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METAR of 12 - 03 - 2003, 07.00 UTC
LIMS 120655Z 22002KT 2800 BR NSC 06/05 Q1021 RMK
BKN FEW120 BKN200 YLO LIMN 120655Z 01001KT 0500
FG NSC 03/02 Q1020 RMK FEW FEW200 RED LIMC
120650Z 00000KT 0900 R35R/1500N R35L/1500N BCFG
RED LIME 120650Z VRB01KT 1500 BR SCT015 BKN020
09/07 Q1021 LIPL 120655Z 29009KT 2800 BR FEW040
SCT200 11/09 Q1021 RMK BKN YLO LIPX 120655Z
03001KT 0800 R05/P1500 FG FEW005 SCT100 06/05
Q1021 RMK BKN AMB LIPT 120655Z 00000KT 0000 FG
VV001 06/05 Q1021 RMK RED LIPS 120655Z 07003KT
0000 FG VV001 07/06 Q1021 RMK RED LIPH 120655Z
09002KT 0050 R07/0175 FG VV001 08/07 Q1021 RMK
WIND THR07 09002KT RED LIPZ 120650Z 00000KT 0100
R04/0250N FG VV001 08/07 Q1020 LIPI 120655Z
02002KT 1500 BR SCT030 SCT070 08/07 Q1021 RMK BKN
AMB