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Department of Commerce $ National Oceanic & Atmospheric Department of Commerce ● National Oceanic & Atmospheric Administration ● National Weather Service NATIONAL WEATHER SERVICE INSTRUCTION 10-512 APRIL 9, 2021 Operations and Services Public Weather Services, NWSPD 10-5 NATIONAL SEVERE WEATHER PRODUCTS SPECIFICATION NOTICE: This publication is available at: https://www.nws.noaa.gov/directives/ OPR: W/AFS21 (G. Schoor) Certified by: W/AFS21 (M. Hawkins) Type of Issuance: Routine. SUMMARY OF REVISIONS: This directive supersedes NWSI 10-512, dated October 9, 2017. The following changes were made to this instruction: 1) Updated the Convective Outlook products with the two new risk categories (Marginal and Enhanced) in sections 2.3.3, 2.3.4, 3.3.3, 5.3.3, Tables 1, 3, 4, and 5, and a new points product example (Figure 4). 2) Removed Watch Points Outline Message product from section 15. 3) Updated the format of the Public Watch Notification Messages in sections 12 and 13. Redefined use of “coastal waters” in sections 12.3.3 and 13.3.3. 4) Updated the issuance criteria for the Public Severe Weather Outlook in sections 7.2.2, 7.2.3, and 7.3.3. 5) Modified WMO Headers for each of the Day 1 Outlooks issuance for the NDFD forecast products in section 6.2 (Table 6). 6) Corrected the Forecast Hour Period for Day 3 and Days 4-8 in Tables 1, 2, and 5. 7) Added new Letter Case format text product examples throughout the various sections and in Appendix A and new graphical examples for many products throughout the various sections. Digitally signed by STERN.ANDRE STERN.ANDREW.D.138 W.D.13829203 2920348 Date: 2021.03.25 4 15:47:48 -04'00' Andrew D. Stern Date Director Analyze, Forecast, and Support Office NWSI 10-512 APRIL 9, 2021 National Severe Weather Products Specification Table of Contents: Page 1. Introduction ............................................................................................................................... 9 2. Categorical Convective Outlook ............................................................................................... 9 2.1 Mission Connection ........................................................................................................... 9 2.2 Issuance Guidelines ........................................................................................................... 9 2.2.1 Creation Software ................................................................................................... 9 2.2.2 Issuance Criteria ...................................................................................................... 9 2.2.3 Issuance Time ......................................................................................................... 9 2.2.4 Valid Time .............................................................................................................. 9 2.2.5 Product Expiration Time (Table 1: SPC Convective Outlook Schedule) ............... 9 2.3 Technical Description ...................................................................................................... 10 2.3.1 Mass News Disseminator Broadcast Line ............................................................ 10 2.3.2 Mass News Disseminator Header ......................................................................... 10 2.3.3 Content .................................................................................................................. 10 2.3.4 Format (Figure 1: Categorical Outlook Format) ................................................... 11 2.4 Updates, Amendments and Corrections .......................................................................... 11 2.5 Graphics PGWE46, PGWI47, PGWK48 ........................................................................ 12 3. Probabilistic Convective Outlook ........................................................................................... 12 3.1 Mission Connection ......................................................................................................... 12 3.2 Issuance Guidelines ......................................................................................................... 12 3.2.1 Creation Software ................................................................................................. 12 3.2.2 Issuance Criteria .................................................................................................... 12 3.2.3 Issuance Time ....................................................................................................... 12 3.2.4 Valid Time (Table 2: SPC Probabilistic Forecast Products) ................................ 12 3.2.5 Product Expiration Time ....................................................................................... 13 3.3 Technical Description ...................................................................................................... 13 3.3.1 Mass News Disseminator Broadcast Line ............................................................ 13 3.3.2 Mass News Disseminator Header ......................................................................... 13 3.3.3 Content (Table 3, 4, and 5: Probability to Categorical Outlook Conversions) ..... 13 3.3.4 Format (Figure 2: Day One Outlook – Tornado Probabilities) ............................. 15 3.4 Updates, Amendments and Corrections .......................................................................... 15 4. Day 4 – 8 Severe Thunderstorm Outlook .............................................................................. 15 4.1 Mission Connection ......................................................................................................... 15 4.2 Issuance Guidelines ......................................................................................................... 15 4.2.1 Creation Software ................................................................................................. 15 4.2.2 Issuance Criteria .................................................................................................... 16 4.2.3 Issuance Time ....................................................................................................... 16 4.2.4 Valid Time ............................................................................................................ 16 4.2.5 Product Expiration Time ....................................................................................... 16 4.3 Technical Description ...................................................................................................... 16 2 NWSI 10-512 APRIL 9, 2021 4.3.1 Mass News Disseminator Broadcast Line ............................................................ 16 4.3.2 Mass News Disseminator Header ......................................................................... 16 4.3.3 Content .................................................................................................................. 16 4.3.4 Format (Figure 3: Day 4-8 Convective Outlook Text Product Format) ............... 16 4.4 Updates, Amendments and Corrections .......................................................................... 17 5. SPC Points Product ................................................................................................................. 17 5.1 Mission Connection ......................................................................................................... 17 5.2 Issuance Guidelines ......................................................................................................... 17 5.2.1 Creation Software ................................................................................................. 17 5.2.2 Issuance Criteria (Table 6: SPC Points Forecast Products) .................................. 17 5.2.3 Issuance Time ....................................................................................................... 17 5.2.4 Valid Time ............................................................................................................ 17 5.2.5 Product Expiration Time ....................................................................................... 17 5.3 Technical Description ...................................................................................................... 18 5.3.1 Mass News Disseminator Broadcast Line ............................................................ 18 5.3.2 Mass News Disseminator Header ......................................................................... 18 5.3.3 Content .................................................................................................................. 18 5.3.4 Format (Figure 4: Day 1 SPC Points Product Format) ......................................... 19 5.4 Updates, Amendments and Corrections .......................................................................... 20 6. SPC NDFD Forecast Product ................................................................................................. 21 6.1 Mission Connection ......................................................................................................... 21 6.2 Issuance Guidelines (Table 7: SPC NDFD Forecast Products) ....................................... 21 6.2.1 Creation Software ................................................................................................. 22 6.2.2 Issuance Criteria .................................................................................................... 22 6.2.3 Issuance Time ....................................................................................................... 22 6.2.4 Valid Time
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