240:
40:
287:
224:. On the approach of a frontal system, the cirrostratus often begins as nebulous and turns to fibratus. If the cirrostratus begins as fragmented of clouds in the sky it often means the front is weak. Cirrostratus is usually located above 5.5 km (18,000 ft). Its presence indicates a large amount of
255:
might follow in the next 12 to 24 hours or as soon as 6–8 hours if the front is fast moving. If the cirrostratus is broken fibratus, it can mean that the front is weak and that stratus rather than nimbostratus will be the precipitating cloud (meaning drizzle or snow grains instead of
309:
5 or 6 (depending on the amount of sky covered) if increasing in amount. If the high cloud covers the entire sky and takes on the form of a featureless veil, it is classified as cirrostratus of the species
325:
Varieties: Cirrostratus species have no opacity-based varieties as they are always translucent. Two pattern-based varieties are sometimes seen with the species fibratus. These are the closely spaced
696:
334:
types similar to those seen with cirrus fibratus. Pattern-based varieties are not commonly associated with the species nebulosus due to its lack of features.
1319:
718:
301:(Cs fib) is a high fibrous sheet similar to cirrus but with less detached semi-merged filaments. It is reported in the SYNOP code as C
738:
630:
612:
554:
536:
520:
470:
443:
1607:
1430:
578:
352:
may form if the cirriform top of a mature thundercloud spreads and flattens sufficiently to become a high stratiform cloud.
1082:
1576:
348:
sometimes appears as the latter cloud flattens and loses some of its stratocumuliform structure. Cirrostratus fibratus
341:
Supplementary features: Cirrostratus produces no precipitation or virga, and is not accompanied by any accessory clouds.
1581:
1435:
1129:
1092:
403:
252:
264:
clouds are often found below cirrostratus formations, due to the stable air associated with cirrostratus creating an
1566:
1445:
1440:
484:
1315:
986:
981:
838:
819:
711:
233:
213:
1341:
1102:
971:
899:
239:
687:
363:
are the result of a complete transformation from cirrus and cirrocumulus genus types. Cirrostratus nebulosis
367:
results when a high grey nebulous altostratus layer thins out into a whitish layer of featureless high cloud.
1450:
1311:
1305:
1207:
265:
1561:
1556:
1022:
914:
398:
217:
1455:
1300:
1017:
935:
221:
1505:
1393:
976:
919:
704:
1647:
1413:
1251:
1202:
1107:
1087:
730:
1510:
1229:
1183:
1156:
1139:
954:
940:
393:
236:
can take on this appearance when composed of tiny supercooled droplets of water or nitric acid.
232:. Clouds resembling cirrostratus occasionally form in polar regions of the lower stratosphere.
512:
506:
1597:
1551:
1377:
1121:
1065:
765:
626:
550:
516:
466:
439:
388:
251:
if they form after cirrus and spread from one area across the sky, and thus may be signs that
622:
616:
546:
540:
435:
429:
1684:
1521:
1257:
1097:
156:
39:
1679:
1602:
1571:
1496:
1336:
904:
691:
257:
1612:
909:
212:-crystals, which are pieces of frozen water. It is difficult to detect and it can make
1673:
1617:
1422:
1372:
1364:
1355:
1295:
1287:
1276:
1194:
1074:
1009:
963:
891:
801:
734:
657:
408:
383:
261:
1515:
1483:
882:
864:
587:
1477:
747:
229:
140:
286:
1234:
1223:
272:
also tend to spread out and can be visible for up to an hour in cirrostratus.
248:
1262:
269:
17:
283:, used to refer to the milky look of the sky when cirrostratus is present.
268:
and restricting convection, causing cumuliform clouds to become flattened.
225:
145:
No, but usually signal the approach of a warm front. But rain in 24 hours
684:
135:
Thin, transparent, high-altitude layer capable of producing a halo.
1622:
727:
238:
205:
122:
95:
78:
58:
733:
and selected species, supplementary features, and other airborne
220:. The cloud has a fibrous texture with no halos if it is thicker
280:
276:
700:
165:
1398:
275:
The phrase "milky sunshine" is often, as well as referring to
209:
1316:
Cumulus castellanus (unofficial alternative name for Cu con))
183:
848:
No differentiated sub-types; tends to resemble cirrostratus
651:
649:
189:
168:
44:
Cirrostratus nebulosus clouds being illuminated by the sun
247:
Cirrostratus clouds sometimes signal the approach of a
216:. These are made when the cloud takes the form of thin
485:"Nitric acid and water PSC, International Cloud Atlas"
192:
174:
162:
159:
1322:
term for Cu con and "Cu cas" is
Towering cumulus ))
186:
180:
177:
1631:
1590:
1544:
1535:
1493:
1468:
1421:
1412:
1386:
1363:
1354:
1329:
1286:
1275:
1244:
1216:
1193:
1182:
1173:
1149:
1138:
1120:
1073:
1064:
1055:
1035:
1008:
999:
962:
953:
928:
890:
881:
872:
863:
837:
818:
809:
800:
764:
755:
746:
171:
139:
131:
121:
111:
94:
77:
57:
49:
32:
1643:(Mother cloud)+mutatus (e.g. cumulomutatus (cumut)
1640:(Mother cloud)+genitus (e.g. cumulogenitus (cugen)
200:is a high-altitude, very thin, generally uniform
27:High-altitude, very thin, generally uniform cloud
656:World Meteorological Organization, ed. (1995).
577:World Meteorological Organization, ed. (1975).
483:World Meteorological Organization, ed. (2017).
428:World Meteorological Organization, ed. (1975).
465:Ludlum, D. (1991). New York: Alfred A. Knopf.
712:
355:Mutatus mother clouds: Cirrostratus fibratus
344:Genitus mother clouds: Cirrostratus fibratus
8:
1541:
1418:
1360:
1283:
1190:
1179:
1146:
1070:
1061:
1005:
959:
887:
878:
869:
815:
806:
761:
752:
719:
705:
697:
38:
820:Nacreous polar stratospheric clouds (PSC)
243:Cirrostratus at night causing a moon halo
741:Latin terminology except where indicated
685:International Cloud Atlas – Cirrostratus
285:
1044:Mutatus non-height specific (see below)
431:Cirrostratus, International Cloud Atlas
420:
29:
7:
580:Varieties, International Cloud Atlas
1446:Stratocumulus stratiformis (Sc str)
1441:Stratocumulus lenticularis (Sc len)
618:Features, International Cloud Atlas
1431:Stratocumulus castellanus (Sc cas)
987:Cirrocumulus stratiformis (Cc str)
982:Cirrocumulus lenticularis (Cc len)
542:Species, International Cloud Atlas
25:
1103:Altocumulus stratiformis (Ac str)
1098:Altocumulus lenticularis (Ac len)
972:Cirrocumulus castellanus (Cc cas)
613:World Meteorological Organization
537:World Meteorological Organization
1208:Cumulonimbus capillatus (Cb cap)
1083:Altocumulus castellanus (Ac cas)
841:polar stratospheric clouds (PSC)
586:. pp. 20–22. Archived from
155:
1387:St-only genitus cloud and other
1023:Cirrostratus nebulosus (Cs neb)
290:High cloud weather map symbols.
1456:Stratocumulus volutus (Sc vol)
1436:Stratocumulus floccus (Sc flo)
1217:Cb-only supplementary features
1018:Cirrostratus fibratus (Cs fib)
1:
1394:Stratus silvagenitus (St sil)
1252:Cumulonimbus flumen ((Cb flu)
1245:Cb-only accessories and other
1093:Altocumulus lacunosus (Ac la)
977:Cirrocumulus floccus (Cc flo)
1203:Cumulonimbus calvus (Cb cal)
1108:Altocumulus volutus (Ac vol)
1088:Altocumulus floccus (Ac flo)
782:Noctilucent type III billows
1157:Nimbostratus virga (Ns vir)
900:Cirrus castellanus (Ci cas)
658:"WMO cloud classifications"
508:Scholastic Atlas of Weather
404:Altostratus undulatus cloud
1701:
1378:Stratus nebulosus (St neb)
1312:Cumulus congestus (Cu con)
1306:Cumulus mediocris (Cu med)
941:Cirrus vertebratus (Ci ve)
785:Noctilucent type IV whirls
511:. Scholastic Inc. p.
234:Polar stratospheric clouds
1235:Cumulonimbus murus ((mur)
1224:Cumulonimbus cauda ((cau)
915:Cirrus spissatus (Ci spa)
779:Noctilucent type II bands
37:
1373:Stratus fractus (St fra)
1301:Cumulus humilis (Cu hum)
1280:Variable vertical extent
1230:Cumulonimbus incus (inc)
905:Cirrus fibratus (Ci fib)
776:Noctilucent type I veils
770:Polar mesospheric clouds
621:. Vol. I. pp.
545:. Vol. I. pp.
505:Vekteris, Donna (2004).
434:. Vol. I. pp.
256:moderate rain or snow).
1451:Stratocumulus Undulatus
936:Cirrus intortus (Ci in)
920:Cirrus uncinus (Ci unc)
910:Cirrus floccus (Ci flo)
314:(Cs neb) and is coded C
1591:Supplementary features
1471:supplementary features
399:Cirrostratus nebulosus
297:Species: Cirrostratus
291:
244:
218:cirrostratus nebulosus
1634:and human-made clouds
1130:Altostratus undulatus
839:Nitric acid and water
289:
242:
222:cirrostratus fibratus
127:Family A (High-level)
208:. It is made out of
117:(20,000 - 43,000 ft)
1652:Homomutatus (homut)
1648:Homogenitus (hogen)
1618:Praecipitatio (pra)
830:Lenticular nacreous
1414:Stratocumulus (Sc)
1401:(Fg) Surface level
1342:Trade wind cumulus
827:Cirriform nacreous
690:2013-12-31 at the
394:Nimbostratus cloud
361:cirrocumulomutatus
350:cumulonimbogenitus
346:cirrocumulogenitus
292:
245:
33:Cirrostratus cloud
1667:
1666:
1663:
1662:
1659:
1658:
1577:Translucidus (tr)
1531:
1530:
1464:
1463:
1408:
1407:
1350:
1349:
1271:
1270:
1187:Towering vertical
1184:Cumulonimbus (Cb)
1169:
1168:
1165:
1164:
1140:Nimbostratus (Ns)
1116:
1115:
1051:
1050:
1031:
1030:
1001:Cirrostratus (Cs)
995:
994:
955:Cirrocumulus (Cc)
949:
948:
929:Ci-only varieties
859:
858:
855:
854:
796:
795:
792:
791:
389:Altostratus cloud
365:altostratomutatus
149:
148:
16:(Redirected from
1692:
1542:
1522:Actinoform cloud
1419:
1361:
1284:
1258:Overshooting top
1191:
1180:
1147:
1122:Altostratus (As)
1071:
1066:Altocumulus (Ac)
1062:
1006:
960:
888:
879:
870:
816:
807:
762:
753:
721:
714:
707:
698:
672:
671:
669:
667:
662:
653:
644:
643:
641:
639:
609:
603:
602:
600:
598:
592:
585:
574:
568:
567:
565:
563:
533:
527:
526:
502:
496:
495:
493:
491:
480:
474:
463:
457:
456:
454:
452:
425:
199:
198:
195:
194:
191:
188:
185:
182:
179:
176:
173:
170:
167:
164:
161:
115:6,000 - 13,000 m
42:
30:
21:
1700:
1699:
1695:
1694:
1693:
1691:
1690:
1689:
1670:
1669:
1668:
1655:
1644:
1633:
1627:
1598:Asperitas (asp)
1586:
1567:Perlucidus (pe)
1552:Duplicatus (du)
1537:
1527:
1524:(Stratocumulus)
1497:accessory cloud
1495:
1489:
1470:
1460:
1404:
1382:
1346:
1325:
1279:
1267:
1240:
1212:
1186:
1175:
1161:
1142:
1134:
1112:
1057:
1047:
1037:
1036:High-level-only
1027:
991:
945:
924:
874:
851:
840:
833:
811:
810:Very high-level
788:
769:
757:
742:
725:
692:Wayback Machine
681:
676:
675:
665:
663:
660:
655:
654:
647:
637:
635:
633:
611:
610:
606:
596:
594:
593:on 25 July 2016
590:
583:
576:
575:
571:
561:
559:
557:
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534:
530:
523:
504:
503:
499:
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477:
464:
460:
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448:
446:
427:
426:
422:
417:
380:
317:
308:
304:
258:Cumulus humilis
158:
154:
116:
68:
45:
28:
23:
22:
15:
12:
11:
5:
1698:
1696:
1688:
1687:
1682:
1672:
1671:
1665:
1664:
1661:
1660:
1657:
1656:
1654:
1653:
1650:
1645:
1641:
1637:
1635:
1632:Mother clouds
1629:
1628:
1626:
1625:
1620:
1615:
1610:
1605:
1600:
1594:
1592:
1588:
1587:
1585:
1584:
1582:Undulatus (un)
1579:
1574:
1569:
1564:
1559:
1557:Lacunosus (la)
1554:
1548:
1546:
1539:
1533:
1532:
1529:
1528:
1526:
1525:
1518:
1513:
1508:
1502:
1500:
1494:Low-level-only
1491:
1490:
1488:
1487:
1481:
1474:
1472:
1469:Low-level-only
1466:
1465:
1462:
1461:
1459:
1458:
1453:
1448:
1443:
1438:
1433:
1427:
1425:
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1405:
1403:
1402:
1396:
1390:
1388:
1384:
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1375:
1369:
1367:
1358:
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1339:
1333:
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1327:
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1323:
1308:
1303:
1298:
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1199:
1197:
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989:
984:
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968:
966:
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951:
950:
947:
946:
944:
943:
938:
932:
930:
926:
925:
923:
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917:
912:
907:
902:
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771:
759:
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743:
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724:
723:
716:
709:
701:
695:
694:
680:
679:External links
677:
674:
673:
645:
631:
615:, ed. (1975).
604:
569:
555:
539:, ed. (1975).
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204:genus-type of
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123:Classification
119:
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1678:
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1675:
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1639:
1638:
1636:
1630:
1624:
1621:
1619:
1616:
1614:
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1609:
1608:Fluctus (flu)
1606:
1604:
1601:
1599:
1596:
1595:
1593:
1589:
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1575:
1573:
1572:Radiatus (ra)
1570:
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1519:
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1514:
1512:
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1503:
1501:
1498:
1492:
1486:Funnel cloud)
1485:
1482:
1479:
1476:
1475:
1473:
1467:
1457:
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1452:
1449:
1447:
1444:
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1080:
1078:
1076:
1072:
1069:
1067:
1063:
1060:
1054:
1043:
1042:
1040:
1038:mutatus cloud
1034:
1024:
1021:
1019:
1016:
1015:
1013:
1011:
1007:
1004:
1002:
998:
988:
985:
983:
980:
978:
975:
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965:
961:
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805:
803:
802:Stratospheric
799:
784:
781:
778:
775:
774:
772:
767:
763:
760:
756:Extreme-level
754:
751:
749:
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736:
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729:
722:
717:
715:
710:
708:
703:
702:
699:
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689:
686:
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682:
678:
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652:
650:
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634:
632:92-63-10407-7
628:
624:
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619:
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605:
589:
582:
581:
573:
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558:
556:92-63-10407-7
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445:92-63-10407-7
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409:Fractus cloud
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384:Stratus cloud
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262:stratocumulus
259:
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253:precipitation
250:
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231:
228:in the upper
227:
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141:Precipitation
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1516:Pannus (pan)
1506:Pileus (pil)
1478:Arcus ((arc)
1356:Stratus (St)
1277:Cumulus (Cu)
1254:Beaver tail)
1056:Medium-level
1000:
865:Tropospheric
735:hydrometeors
664:. Retrieved
636:. Retrieved
617:
607:
595:. Retrieved
588:the original
579:
572:
560:. Retrieved
541:
531:
507:
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488:. Retrieved
478:
461:
449:. Retrieved
430:
423:
364:
360:
357:cirromutatus
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349:
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331:
327:
311:
298:
274:
246:
201:
152:Cirrostratus
151:
150:
70:
64:
50:Abbreviation
18:Cirrostratus
1623:Virga (vir)
1613:Mamma (mam)
1603:Cavum (cav)
1562:Opacus (op)
1511:Velum (vel)
1484:Tuba ((tub)
1237:Wall cloud)
1226:Tail cloud)
1143:Multi-level
883:Cirrus (Ci)
766:Noctilucent
748:Mesospheric
230:troposphere
1674:Categories
1536:Non-height
873:High-level
666:1 February
415:References
328:duplicatus
249:warm front
202:stratiform
132:Appearance
102:Duplicatus
69:-stratus "
1545:Varieties
1499:and other
1337:Horseshoe
1263:Hot tower
1174:Low-level
1150:Varieties
638:26 August
597:26 August
562:26 August
451:26 August
332:undulatus
330:and wavy
312:nebulosus
305:8 or as C
279:or light
270:Contrails
266:inversion
105:Undulatus
88:Nebulosus
63:Cirrus- "
1538:specific
812:15–30 km
758:80–85 km
688:Archived
378:See also
299:fibratus
226:moisture
112:Altitude
85:Fibratus
1685:Stratus
1520:Other-
1423:Species
1365:Species
1296:Fractus
1288:Species
1195:Species
1075:Species
1010:Species
964:Species
892:Species
875:3–18 km
490:3 April
96:Variety
79:Species
71:layered
1680:Cirrus
1480:Shelf)
1176:0–2 km
1058:2–8 km
731:genera
629:
553:
519:
469:
442:
1330:Other
768:(NLC)
728:Cloud
661:(PDF)
623:22–24
591:(PDF)
584:(PDF)
547:17–20
436:29–31
214:halos
206:cloud
67:" and
59:Genus
1320:ICAO
668:2012
640:2014
627:ISBN
599:2014
564:2014
551:ISBN
517:ISBN
492:2019
467:ISBN
453:2014
440:ISBN
281:mist
277:haze
65:curl
1399:Fog
739:WMO
359:or
260:or
210:ice
1676::
737:-
648:^
625:.
549:.
515:.
513:14
438:.
318:7.
184:ɑː
169:oʊ
166:ɪr
53:Cs
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713:t
706:v
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316:H
307:H
303:H
196:/
193:s
190:ə
187:t
181:r
178:t
175:s
172:ˈ
163:s
160:ˌ
157:/
73:"
20:)
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