Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009)
y Low-topped convection that contains little or no lightning may not be depicted,
y Erroneous motion vectors are occasionally assigned to storms, and
y Convective hazard field scales are not identified within the forecast polygons.
9.2.5 Uses of the NCWF The purpose of the National Convective Weather Forecast (NCWF) is to produce a convective hazard field diagnostic and forecast product based on radar data, echo top mosaics, and lightning data. The target audience includes the FAA and other government agencies, pilots, airline dispatchers, aviation meteorologists, and other interested aviation users in the general public. The NCWF is a supplement to, but does not substitute for, the report and forecast information contained in Convective SIGMETs.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-12
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009)
9.3 Current Icing Product (CIP) The Current Icing Product (CIP) product combines sensor and numerical data to provide a hourly three-dimensional diagnosis of the icing environment. This information is displayed on a suite of twelve graphics which are available for the 48 contiguous United States, much of Canada and Mexico, and their respective coastal waters.
The CIP product suite is automatically produced with no human modifications. Information on the graphics is determined from observational data including WSR-88D radar, satellite, pilot weather reports, surface weather reports, lightning and computer model output.
FAA policy states the CIP is a supplementary weather product for enhanced situational awareness only and must be used with one or more primary products such as an AIRMET or SIGMET (see AIM 7-1-3).
9.3.1 Issuance The CIP product suite is issued hourly 15 minutes after the hour by the Aviation Weather Center (AWC). The products are available through the Aviation Digital Data Service (ADDS) web site at: http://adds.aviationweather.noaa.gov/icing/icing_nav.php.
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9.3.2 Content The CIP product suite consists of 10 graphics including:
• Icing Probability,
• Icing Probability Maximum (Max),
• Icing Severity,
• Icing Severity Max,
• Icing Severity – Probability > 25%,
• Icing Severity – Probability > 25% Max,
• Icing Severity – Probability > 50%,
• Icing Severity – Probability > 50% Max,
• Icing Severity plus Supercooled Large Droplets (SLD), and
• Icing Severity plus Supercooled Large Droplets (SLD) Max.
The CIP products are generated for individual altitudes from 1,000 feet MSL to Flight Level (FL) 300 at intervals of 1,000 feet.
The CIP Max products are a composite product which displays information about icing at all altitudes from 1,000 feet MSL to FL300. Single altitudes are referenced to MSL from the 1,000 AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-13
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) to 17,000 feet and Flight Levels above 17,000 feet. The ADDS web site allows for access to every other altitude (1,000 FT, 3,000 FT, 5,000 FT, etc...). However, all altitudes can be accessed by use of the Flight Path Tool on the ADDS site.
Icing PIREPs are plotted on a single altitude graphic if the PIREP is within 1,000 feet of the selected altitude and has been observed within 75 minutes of the chart's valid time. On the CIP Max graphics, PIREPs for all altitudes (i.e. 1,000 feet MSL to FL300) are displayed. However, negative reports of icing are not plotted on the CIP Max products in an effort to reduce clutter.
The PIREP legend is located on the bottom of each graphic.
9.3.2.1 Icing Probability The Icing Probability product (Figure 9-12) displays, at a single altitude, the probability of icing.
Probabilities range from 0% (no icing expected) to 85% or greater (nearly certain icing.)
By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7—1-3).
Probability of icing at 3000 ft. MSL Analysis valid 1500 UTC Mon 27 Nov 2006 terrain 5 15 25 35 45 55 65 75 g Negative LJ Trace-Light Wu Light-Moderate WI Moderate-Savera (percent) Icing PIREP Symbols LI Troce Lyl Light ' Moderate Y/ savera Figure 9-12. CIP Icing Probability (3,000 feet MSL) Example AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-14
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) "Cool" colors represent low probabilities and "warm" colors represent higher probabilities.
Probabilities do not reach 100% because the data used to determine the probability of icing cannot diagnose, with absolute certainty, the presence of icing conditions at any location and altitude. White regions indicate that the probability of icing is zero. Brown regions indicate where higher-elevation terrain extends above the altitude of the particular graphic.
9.3.2.2 Icing Probability -- Maximum The Icing Probability - Maximum graphic (Figure 9-13) displays the probability of icing at all altitudes from 1,000 feet MSL to FL300. Probabilities range from 0% (no icing expected) to 85% or greater (nearly certain icing.)
dy FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used mith one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7-1-3).
Maximum icing probability (1000 ft. MSL to FL300) Analysis valid 1600 UTC Mon 27 Nov 2006 25 45 ₴5 75 If Trace-Light Vp Light-Maderate _I Moderate-Savera (percent) cing PIREP Symbals W Trace Ly Light ly/ Maderate Lyl Severa Figure 9-13. CIP Icing Probability - Max Example "Cool" colors represent low probabilities and "warm" colors represent higher probabilities.
Probabilities do not reach 100% because the data used to determine the probability of icing AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-15
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) cannot diagnose, with absolute certainty, the presence of icing conditions at any location and altitude. White regions indicate the probability of icing is zero.
9.3.2.3 Icing Severity The Icing Severity product (Figure 9-14) depicts, at a single altitude, the intensity of icing expected at locations where the Icing Probability product depicts possible icing. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7—1-3).
Icing severity at 3000 ft. MSL Analysis valid 1500 UTC Mon 27 Nov 2006 terrain None Trace Light Moderate Heavy g Negative 4J Trace-Light W Light-Maderate I Moderate-Savare Icing PIREP Symbals W Trace l Light a maderate Ly severe Figure 9-14. CIP Icing Severity (3,000 feet MSL) Example The lightest blue color represents trace icing. As the blue-color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. Brown regions indicate where higher-elevation terrain extends above the altitude of the particular graphic.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-16
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009)
9.3.2.4 Icing Severity -- Maximum The Icing Severity - Maximum product (Figure 9-15) displays the intensity of icing at all altitudes from 1,000 feet MSL to FL300. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7—1—3).
Maximum icing severity (1000 ft. MSL to FL300) Analysis valid 1600 UTC Mon 27 Nov 2006 None Trace Light Moderate Heavy 1]) Trace-Light V Light-Moderate \I Moderate-Savara Icing PIREP Symbols & Trace LylLight W/ Moderate 'y! Savare Figure 9-15. CIP Icing Severity - Max Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary.
9.3.2.5 Icing Severity - Probability > 25% The Icing Severity - Probability > 25% product (Figure 9-16) depicts, at a single altitude, where a 26 to 100 percent probability exists for the indicated icing intensity. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-17
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) dy FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must ba ised with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7—1—3).
Icing severity (prob>25%) at 3000 ft. MSL Analysis valid 1500 UTC Mon 27 Nov 2006 terrain None <25% Trace Light Moderate Heary ø3 Negative Ц/ Trace-Light Vp Light-Moderate L Moderate-Savara Icing PIREP Symbols W Trace Lylight 4) Moderate Ly Savare Figure 9-16. CIP Icing Severity Probability >25% Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. Brown regions indicate higher-elevation terrain extending above the altitude of the particular graphic. A gray color is used to mask the intensity pixels where the probability of icing is 25% or less.
9.3.2.6 Icing Severity - Probability > 25% - Maximum The Icing Severity - Probability > 25% - Maximum product (Figure 9-17) depicts, at all altitudes from 1,000 feet MSL to FL300, where the probability of the indicated icing intensity is 26 to 100 percent. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate, heavy.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-18
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7—1—3).
Maximum icing severity (prob>25%) (1000 ft. MSL to FL300) Analysis valid 1700 UTC Mon 27 Nov 2006 None <25% Trace Light Moderate Heavy
4) Trace-Light Vy Light-Moderate 1 Moderate-Savera Icing PIREP Symbols W Trace L) Light / Moderate Yu/ Severe Figure 9-17. CIP Icing Severity Probability >25% Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. A gray color is used to mask the intensity pixels where the probability of icing is 25% or less.
9.3.2.7 Icing Severity - Probability > 50% The Icing Severity - Probability > 50% product (Figure 9-18) depicts, at a single altitude, where the probability of the indicated icing intensity 51 to 100 percent. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-19
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only nd must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7-1-3).
Icing severity (prob>50%) at 3000 ft. MSL Analysis valid 1500 UTC Mon 27 Nov 2006 terrain None <50% Trace Light Moderate Heavy ø Negative 4J Trace-Light Vp Light-Moderate I Moderate-Severe Icing PIREP Symbols W Trace Le Light / Moderate If Savare Figure 9-18. CIP Icing Severity Probability > 50% Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. Brown regions indicate where higher-elevation terrain extends above the altitude of the particular graphic. A gray color is used to mask the intensity pixels where the probability of icing is 50% or less.
9.3.2.8 Icing Severity - Probability > 50% - Maximum The Icing Severity - Probability > 50% - Maximum product (Figure 9-19) depicts, at all altitudes from 1,000 feet MSL to FL300, where the probability of the indicated icing intensity is 51 to 100 percent. Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-20
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must be used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AM 7-1-3j.
Maximum icing severity (prob>50%) (1000 fl. MSL to FL300) Analysis valid 1700 UTC Mon 27 Nov 2006 None <50% Trace Light Moderate HedYy
4) Trace-Light WU Light-Maderate _ Moderate-Savere Icing PIREP Symbals W Trace Ll Light Wu Moderate Ip! Savers Figure 9-19. CIP Icing Severity Probability > 50% - Max Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. A gray color is used to mask the intensity pixels where the probability of icing is 50% or less.
9.3.2.9 Icing Severity plus Supercooled Large Droplets (SLD) The Icing Severity plus Supercooled Large Droplets (SLD) product (Figure 9-20) depicts, at a single altitude, the intensity of icing expected as well as locations where a threat for SLD exists.
SLD is defined as supercooled water droplets larger than 50 micrometers in diameter. These size droplets include freezing drizzle and/or freezing rain aloft. SLD, which are outside the icing AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-21
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009) certification envelopes (FAR Part 25 Appendix C), can be particularly hazardous to some aircraft.
Icing intensity is displayed using standard icing intensity categories: trace, light, moderate and heavy.
By FAA policy CIP is a Supplementary Weather Product for enhanced situational avareness only and must be used mith one or more primary products (safety decision) such as an AIRMET or SIGMET (see AM 7—1—3) Icing severity at 3000 ft. MSL Analysis valid 1800 UTC Mon 27 Nov 2006 SLD threat terrain None Trace Light Moderate Heavy ø3 Negative WJ Trace-Light Vp Light-Moderate I Moderate-Savera cing PIREP Symbols I Trace Kul Light Y/ savere Figure 9-20. CIP Icing Severity plus Supercooled Large Droplets (SLD) Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate where no probability of icing exists and, therefore, no intensity is necessary. Brown regions indicate where higher-elevation terrain extends above the altitude of the particular graphic.
Locations where a threat for SLD exists are depicted with red hatching.
AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-22
Aviation Weather Services, Advisory Circular 00-45F, Change 2 (March 2009)
9.3.2.10 Icing Severity plus Supercooled Large Droplets (SLD) - Maximum The Icing Severity plus Supercooled Large Droplets (SLD) product (Figure 9-21) depicts at all altitudes, between 1,000 feet MSL and FL300, the intensity of icing expected as well as locations where a threat for SLD exists.
SLD is defined as supercooled water droplets larger than 50 micrometers in diameter. These size droplets include freezing drizzle and/or freezing rain aloft. SLD, which are outside the icing certification envelopes (FAR Part 25 Appendix C), can be particularly hazardous to some aircraft.
By FAA policy CIP is a Supplementary Weather Product for enhanced situational awareness only and must bea used with one or more primary products (safety decision) such as an AIRMET or SIGMET (see AIM 7-1-3).
Maximum icing severity (1000 ft. MSL to FL300) Analysis valid 1500 UTC Mon 27 Nov 2006 SLD threat None Trace Light Moderate Heavy If Trace-Light I Light-Moderate I Moderate-Severe Icing PIREP Symbale W Trace Yul Light y Moderate fl Severe Figure 9-21. CIP Icing Severity plus Supercooled Large Droplets (SLD) - Max Example The lightest blue color represents trace icing. As the blue color shades become darker, the icing intensity increases. The darkest blue color represents heavy icing. White regions indicate AC 00-45F, CHG 2 Section 9: Supplementary Products Page 9-23