186:
214:
square miles, and the population affected is divided by 51,553,600 (using 2010 census data). This gives eight different numbers representing how widespread the storm is compared to notable snow storms in that region. The baseline area and population represent the average area and population for large storms, so that each of these eight different measures will average to an RSI value of 1.0 among storms considered notable (for the calibration sample). The RSI is simply the sum of these eight numbers.
226:
213:
For each threshold and each region, a baseline area and population are determined; for a given storm, the area that exceeds a particular threshold will be normalized by the baseline value. For example, for a storm in the
Northeast, the area receiving at least 4 inches of snow is divided by 149,228
176:
The index makes use of population and regional differences to assess the impact of snowfall. For example, areas which receive very little snowfall on average may be more adversely affected than other regions, and so the index will grant storms in those regions higher severity.
172:
Storms are ranked from
Category 0 "Nuisance" to Category 5 "Extreme" on the scale. The impact of the storms is assessed in six different regions of the United States: the Northeast, Northern Rockies and Plains, Ohio Valley, South, Southeast, and Upper Midwest.
210:
For example, in the
Northeast, a typical location will get 16 inches of snow about once every 10 years and 20 inches about once every 25 years, so the thresholds are 4, 10, 20, and 30 inches.
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Squires, Michael F.; Lawrimore, Jay H.; Heim Jr., Richard R.; Robinson, David A.; Gerbush, Mathieu R.; Estilow, Thomas W. (December 2014).
169:(NCDC) began using in 2005. The NCDC has retroactively assigned RSI values to almost 600 historical storms that have occurred since 1900.
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The map shows the six easternmost weather regions of the United States for which the regional snowfall index is calculated.
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and classify them into one of six categories. The system was first implemented in 2014, and is a replacement for the
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In each region, four "thresholds" are set based on climatological records for calculation of the RSI value:
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to assess the societal impact of winter storms in the eastern two-thirds of the
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one and a half times the amount of snow typically occurring once every 25 years
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one quarter of the amount of snow typically occurring once every 10 years
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one half of the amount of snow typically occurring once every 25 years
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the amount of snow typically occurring once every 25 years
245:
List of regional snowfall index category 4 winter storms
240:
List of regional snowfall index category 5 winter storms
16:
United States scale that ranks winter storms by severity
344:"Snowstorm was Category 4 on NOAA winter storm scale"
322:
NOAA: National
Centers for Environmental Information
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281:Bulletin of the American Meteorological Society
413:Major snow and ice events in the United States
2118:National Centers for Environmental Prediction
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342:Furgurson III, E.B. (January 29, 2016).
255:Accumulated winter season severity index
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32:
30:
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374:NOAA's Regional Snowfall Index (RSI)
14:
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318:"Regional Snowfall Index (RSI)"
163:Northeast Snowfall Impact Scale
1:
276:"The Regional Snowfall Index"
167:National Climatic Data Center
2139:
2113:Meteorological quantities
419:
303:10.1175/BAMS-D-13-00101.1
165:(NESIS) system which the
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108: Significant
98:
83:
68:
53:
147:regional snowfall index
78: Crippling
22:Regional Snowfall Index
2103:Extratropical cyclones
190:
138: Nuisance
2072:Extratropical cyclone
250:Miller classification
188:
153:) is a scale used by
133: <1.0
123: Notable
63: Extreme
1853:Dec 30 – Jan 2, 2021
1470:Dec 30, 2013 – Jan 4
783:Dec 30, 1963 – Jan 4
294:2014BAMS...95.1835S
93: Major
73: 10–18
25:
2123:Weather prediction
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88: 6–10
19:
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288:(12): 1835–1848.
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159:United States
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27:
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2082:Storm naming
2077:Polar vortex
2009:
1993:Jan 31–Feb 2
1987:
1933:
1859:
1805:
1750:
1700:
1631:
1582:
1528:
1464:
1420:
1386:
1352:
1308:
1268:
1241:
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1172:
1155:
1131:
1114:
1092:
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1062:21st century
1040:
1028:
1009:
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985:
973:
961:
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580:20th century
563:
546:
534:
522:
516:Feb 27–Mar 7
510:
378:
353:. Retrieved
347:
337:
327:December 26,
325:. Retrieved
321:
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269:
212:
209:
192:
175:
171:
150:
146:
144:
58:18.0+
47:
42:
37:
943:Dec 22 – 24
349:The Capital
48:Description
2097:Categories
261:References
2062:Cold wave
2040:Feb 16–17
2035:Feb 10–13
2025:Jan 13–16
1998:Feb 21–28
1981:Dec 21–26
1976:Dec 12-16
1971:Nov 17–20
1964:Apr 11-14
1959:Feb 22-26
1949:Jan 27–30
1944:Jan 14–17
1927:Dec 13–18
1917:Oct 24–26
1910:Apr 15–17
1905:Mar 16–17
1900:Mar 10–17
1895:Feb 15–20
1890:Feb 13–17
1885:Feb 11–14
1880:Feb 10–12
1865:Jan 12–17
1848:Dec 23–25
1843:Dec 14–18
1828:Oct 29–30
1823:Oct 26–28
1811:Jan 14–19
1788:Dec 21–26
1776:Apr 10–12
1771:Mar 11–15
1766:March 3-4
1761:Feb 11–13
1756:Jan 16–21
1743:Nov 14-15
1736:Apr 12–15
1731:Mar 20–22
1726:Mar 11–15
1711:Jan 13–16
1689:Oct 29–31
1677:Mar 11–15
1667:Feb 12–14
1657:Jan 21–23
1652:Jan 19–24
1647:Jan 10–17
1625:Dec 23–26
1618:Apr 15–23
1613:Mar 21–25
1603:Feb 23–24
1588:Jan 21–24
1576:Dec 26–30
1571:Nov 24–27
1554:Feb 25–26
1544:Feb 12–17
1534:Jan 23–30
1522:Dec 10–27
1512:Nov 13–21
1500:Mar 24–28
1490:Feb 19–21
1485:Feb 11–14
1480:Jan 27–31
1475:Jan 20–22
1458:Dec 19–23
1453:Nov 22–28
1441:Mar 18–20
1414:Dec 25–28
1409:Dec 17–22
1392:Jan 16–20
1363:Jan 24–28
1341:Oct 23–28
1334:Mar 12–16
1329:Feb 24–27
1314:Jan 17–26
1291:Dec 22–28
1286:Dec 16–20
1281:Oct 13–20
1274:Jan 25–30
1262:Dec 19–25
1257:Dec 11–12
1220:Apr 13–17
1215:Feb 12–20
1210:Jan 11–24
1188:Nov 20–24
1183:Oct 11–13
1178:Feb 11–13
1166:Dec 14–16
1161:Jan 20–23
1149:Dec 24–28
1144:Dec 21–24
1137:Feb 17–23
1120:Feb 14–19
1098:Jan 29–31
1086:Dec 27–31
1081:Jan 18–30
1051:Jan 14–15
1022:Oct 24–26
979:Mar 12–15
967:Dec 10–12
919:Jan 13–14
902:Jan 25–27
831:Dec 25–28
807:Jan 26–27
795:Jan 27–31
771:Oct 25–30
744:Jan 18–21
739:Jan 11–13
727:Dec 11–13
710:Mar 18–22
698:Mar 18–19
686:Feb 17–18
674:Nov 24–30
662:Dec 25–26
650:Nov 10–12
638:Jan 27–28
626:Mar 15–18
602:Nov 27–28
569:Feb 11–14
557:Mar 11–14
552:Jan 12–13
423:Seasons:
43:RSI value
2020:Jan 8–10
2003:Mar 9–17
1922:Dec 9–12
1694:Dec 8–10
1672:Feb 8–22
1662:Feb 6–10
1642:Jan 7–13
1608:Mar 8–11
1598:Feb 7–10
1564:May 9–11
1517:Dec 9–11
1507:Nov 8–13
1436:Mar 1–10
1426:Feb 7–18
1404:Nov 7–10
1380:Nov 8–10
1358:Jan 8–13
1346:Dec 5–29
1324:Feb 7–11
1252:Mar 6–10
1247:Jan 3–11
1235:Dec 8–18
1034:Jan 4–10
1003:Jan 6–10
866:Jan 9–12
855:Feb 9–11
819:Feb 8–10
614:Nov 6–11
540:Jan 6–10
528:Oct 4–11
218:See also
181:Overview
38:Category
2055:Related
2030:Feb 1–7
2015:Jan 6–7
1954:Feb 1–5
1939:Jan 3–4
1875:Feb 6–8
1838:Dec 4–6
1816:Feb 2–5
1721:Mar 6–8
1716:Mar 1–3
1706:Jan 2–5
1637:Jan 4–8
1559:Mar 1–6
1448:Oct 3–5
1319:Feb 1–6
1125:Dec 5–8
1108:Dec 4–5
1046:Jan 2–4
991:Feb 2–6
907:Feb 5–7
844:Mar 3–5
824:Mar 5–8
759:Mar 6–8
748:Feb 2–5
722:Mar 2–5
495:2023–24
490:2022–23
485:2021–22
480:2020–21
475:2019–20
470:2018–19
465:2017–18
460:2016–17
455:2015–16
450:2014–15
445:2013–14
440:2012–13
435:2011–12
430:2010–11
425:2009–10
355:3 March
290:Bibcode
84:Three
1799:2020s
1302:2010s
1103:Feb 7
1069:2000s
878:Feb 2
129:Zero
69:Four
54:Five
2010:2024
1988:2023
1934:2022
1860:2021
1806:2020
1751:2019
1701:2018
1632:2017
1583:2016
1529:2015
1465:2014
1421:2013
1387:2012
1353:2011
1309:2010
1269:2009
1242:2008
1205:2007
1173:2006
1156:2005
1132:2004
1115:2003
1093:2002
1076:2000
1041:1999
1029:1998
1010:1997
998:1996
986:1995
974:1993
962:1992
950:1991
938:1989
926:1983
914:1979
897:1978
885:1977
873:1976
861:1975
851:1973
839:1971
814:1969
802:1967
790:1966
778:1964
766:1963
754:1962
734:1961
717:1960
705:1958
693:1956
681:1952
669:1950
657:1947
645:1940
633:1922
621:1920
609:1913
597:1905
587:1900
564:1899
547:1888
535:1886
523:1804
511:1717
357:2019
329:2020
155:NOAA
145:The
114:One
99:Two
298:doi
151:RSI
2099::
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1966:)
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292::
149:(
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