FAQ’s

    Filename Description Grid Units Forecast Interval Level HHYB03 Height (Geopotential) GFS Global m 3 hour forecast 30 hPa HHYB05 Height (Geopotential) GFS Global m 3 hour forecast 50 hPa HHYB10 Height (Geopotential) GFS Global m 3 hour forecast 100 hPa HHYB15 Height (Geopotential) GFS Global m 3 hour forecast 150 hPa HHYB20 Height

    FILENAME VALID TIME DESCRIPTION GRID FORECAST INTERVAL LEVEL G1298IE.GR2 1200 UTC U Wind, V Wind, and Temperature GFS Global 0 hour forecast Surface G1297IE.GR2 1200 UTC U Wind, V Wind, and Temperature GFS Global 0 hour forecast Tropopause G1296IE.GR2 1200 UTC U Wind, V Wind, and Temperature GFS Global 0 hour forecast Maximum

    FILENAME VALID TIME DESCRIPTION GRID FORECAST INTERVAL LEVEL H1210IE.GR2 1200 UTC U Wind, V Wind, Temperature, and Heights GFS Global 0 hour forecast 100 millibars H1215IE.GR2 1200 UTC U Wind, V Wind, Temperature, and Heights GFS Global 0 hour forecast 150 millibars H1220IE.GR2 1200 UTC U Wind, V Wind, Temperature, and Heights GFS

This table shows the names of the parameters to be accessible for OGC filter selection per layer: Layer Query Parameters Additional Display Parameters JETSTREAM_FCST valid_utc expiration_utc altitude_ft speed_kts geometry model_utc TROPOPAUSE_LOW_FCST valid_utc expiration_utc altitude_ft geometry model_utc TROPOPAUSE_HEIGHT_FCST valid_utc expiration_utc altitude_ft geometry model_utc FLIGHT_CATEGORY valid_utc expiration_utc flt_code flt_category geometry model_utc CLOUD_CEILING valid_utc expiration_utc cigs_code cigs_height flt_category

To download spreadsheet, click here FILENAME DESCRIPTION GRID UNITS FORECAST INTERVAL LEVEL FH_WPGHHW03(md)(mh) High Ice Water Content Global g/m3 ( values of 1, 2, or 3) 3 hour forecast FL300 / 300hPa FH_WPGHHW04(md)(mh) High Ice Water Content Global g/m3 ( values of 1, 2, or 3) 4 hour forecast FL300 / 300hPa FH_WPGHHW05(md)(mh) High Ice

To download spreadsheet, click here FILENAME DESCRIPTION GRID UNITS FORECAST INTERVAL LEVEL FH_NXGHHW00(md)(mh) High Ice Water Content North America g/m3 ( values of 1, 2, or 3) 0 hour forecast FL300 / 300hPa FH_NXGHHW01(md)(mh) High Ice Water Content North America g/m3 ( values of 1, 2, or 3) 1 hour forecast FL300 / 300hPa FH_NXGHHW02(md)(mh)

To download spreadsheet, click here FILENAME DESCRIPTION GRID UNITS FORECAST INTERVAL FLIGHT INTERVAL ATMOSPHERIC LEVEL HiYA30 High Ice Water Content Global g/m3 0 hour forecast FL300 300 hPa HiYB30 High Ice Water Content Global g/m3 1 hour forecast FL300 300 hPa HiYK30 High Ice Water Content Global g/m3 10 hour forecast FL300 300 hPa HiYL30

To download spreadsheet, click here FILENAME DESCRIPTION GRID UNITS FORECAST INTERVAL FLIGHTLEVEL ATMOSPHERIC LEVEL HiDA30 High Ice Water Content North America g/m3 0 hour forecast FL300 300 hPa HiDB30 High Ice Water Content North America g/m3 1 hour forecast FL300 300 hPa HiDK30 High Ice Water Content North America g/m3 10 hour forecast FL300 300

High Ice Water Content (HIWC) can be ingested into aircraft engines as small ice crystals. When ice crystals hit warm aircraft engines, they start to melt and evaporate, cooling the engine core surfaces to temperatures below freezing. The cooling engine causes the melted ice crystal water to refreeze, and ice accumulates inside the engine core.

This list is for all Flight Hazards Forecast files in GIS Shapefile and GeoJSON format within the Global domain. To download spreadsheet, click here Shapefile FILENAME GeoJSON FILENAME DESCRIPTION GRID UNITS FORECAST INTERVAL LEVEL FH_WPGZII03(md)(mh) JH_WPGZII03(md)(mh) Medium Aircraft Icing Forecast Global Light / Moderate / Severe 3 hour forecast All Levels Max Icing FH_WPGZII04(md)(mh) JH_WPGZII04(md)(mh)