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Altocumulus cloud

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461: 473: 521: 276:. It is therefore one of three warning clouds often recorded by the aviation industry, the other two being towering cumulus and cumulonimbus. Altocumulus generally forms at about 2,000 to 6,100 m (6,600 to 20,000 ft) above ground level, a similar level to altostratus formations, and satellite photography reveals that the two types of cloud can create formations that can stretch for thousands of square miles. Extensive altocumulus formations, particularly if they take the form of undulatus, are often referred to as altocumulus 497: 485: 239: 509: 449: 63: 40: 289: 235:, where the altostratus is starting to fragment, resulting in patches of altocumulus perlucidus between the areas of altostratus. Altocumulus is also commonly found between the warm and cold fronts in a depression, although this is often hidden by lower clouds. 404:
Cloud-based supplementary feature: Mamma caused by localized downdrafts in the cloud layer are occasionally seen with altocumulus. A newly recognized type is the asperitas feature that is characterized by chaotic undulations caused by severe wind
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Genitus Mother clouds: Altocumulus stratiformis cumulogenitus or cumulonimbogenitus can form when the middle or upper part of a towering free convective cloud begins to spread horizontally due to a loss of convective lift. It is coded
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species (Ac str) is composed of sheets or relatively flat patches of stratocumuliform cloud. The synoptic coding is determined by the predominant variety or occasionally by the genitus mother cloud. Altocumulus lenticularis (Ac len
320:(Ac cas), a turreted middle cloud that can achieve significant vertical development and signals increasing air mass instability. It is nevertheless usually classified as middle rather than vertical and is coded C 818: 215:
physical category, characterized by globular masses or rolls in layers or patches – the individual elements being larger and darker than those of
804: 848: 374:(arranged in parallel bands) is sometimes seen with the stratformis and castellanus species. Altocumulus stratiformis radiatus of any opacity is coded C 796: 460: 430:
Mutatus mother clouds: Altocumulus can form due to the complete transformation of cirrocumulus, altostratus, nimbostratus, or stratocumulus.
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8. Chaotic altocumulus, which is typically poorly defined with multiple species or transitional forms arranged in several layers, is coded C
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Precipitation-based supplementary feature: Altocumulus often produces virga but usually not precipitation that reaches the ground.
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varieties are occasionally seen with the stratiformis and lenticularis species. Altocumulus stratiformis duplicatus is coded C
701: 840: 484: 520: 148: 312:". This is formed by uplift usually associated with mountains. but usually with at least some grey shading. It is coded C 472: 328:
species (Ac flo) is a tufted middle cloud which is also associated with greater instability. It shares the same code C
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7). Varieties based on opacity are not commonly associated with the species lenticularis, castellanus, or floccus.
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is very occasionally associated with altocumulus of the species stratiformis, castellanus, or floccus.
231:. A sheet of partially conjoined altocumulus perlucidus is sometimes found preceding a weakening warm 1437: 1108: 1103: 960: 941: 833: 856: 1463: 1224: 1093: 1021: 300: 1572: 1433: 1427: 1329: 317: 261: 1683: 1678: 1144: 1036: 537: 448: 623: 562: 508: 1577: 1422: 1139: 1057: 745: 739: 669: 663: 584: 1627: 1515: 1345: 1098: 1041: 826: 792:
Clouds-Online.com Cloud Atlas with many photos and description of the different cloud genus
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in structure. Like other cumuliform and stratocumuliform clouds, altocumulus signifies
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Opacity-based varieties: Altocumulus stratiformis has three opacity-based varieties;
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Middle cloud weather map symbols: Includes middle-étage and downward growing vertical.
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later in the day, as it shows instability and convection in the middle levels of the
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clouds arranged in groups or rolls. Has smaller clouds separate from each other
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7 if it is not overridden by another coding of higher importance.
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4 on the SYNOP weather observation. Grey shading is also seen with
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and selected species, supplementary features, and other airborne
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Cumulus castellanus (unofficial alternative name for Cu con))
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No differentiated sub-types; tends to resemble cirrostratus
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Manual on the Observation of Clouds and Other Meteors
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term for Cu con and "Cu cas" is Towering cumulus ))
877: 613: 1765:(Mother cloud)+mutatus (e.g. cumulomutatus (cumut) 1762:(Mother cloud)+genitus (e.g. cumulogenitus (cugen) 1793: 700:World Meteorological Organization, ed. (1975). 797:National Science Digital Library – Altocumulus 359:3 or 7 depending on predominant opacity), and 75:alto-, meaning high, and cumulo-, meaning heap 834: 299:Species: Altocumulus has four species. The 490:Altocumulus floccus with line of castellanus 841: 827: 583:"Altocumulus, International Cloud Atlas". 576: 38: 942:Nacreous polar stratospheric clouds (PSC) 502:Altocumulus undulatus during a cold front 1271: 863:Latin terminology except where indicated 693: 287: 264:, frequently signals the development of 237: 1166:Mutatus non-height specific (see below) 780:International Cloud Atlas – Altocumulus 728: 14: 1794: 1543: 1195: 1130: 1084: 652: 378:5 if it is increasing in amount. The 822: 207: 'heaped') is a middle-altitude 703:Varieties, International Cloud Atlas 1568:Stratocumulus stratiformis (Sc str) 1563:Stratocumulus lenticularis (Sc len) 741:Features, International Cloud Atlas 24: 1553:Stratocumulus castellanus (Sc cas) 1109:Cirrocumulus stratiformis (Cc str) 1104:Cirrocumulus lenticularis (Cc len) 665:Species, International Cloud Atlas 25: 1813: 1225:Altocumulus stratiformis (Ac str) 1220:Altocumulus lenticularis (Ac len) 1094:Cirrocumulus castellanus (Cc cas) 773: 736:World Meteorological Organization 660:World Meteorological Organization 591:World Meteorological Organization 526:Altocumulus stratiformis radiatus 1330:Cumulonimbus capillatus (Cb cap) 1205:Altocumulus castellanus (Ac cas) 963:polar stratospheric clouds (PSC) 709:. pp. 20–22. Archived from 519: 507: 495: 483: 471: 459: 447: 61: 1509:St-only genitus cloud and other 1145:Cirrostratus nebulosus (Cs neb) 260:Towering altocumulus, known as 1578:Stratocumulus volutus (Sc vol) 1558:Stratocumulus floccus (Sc flo) 1339:Cb-only supplementary features 1140:Cirrostratus fibratus (Cs fib) 814:WW2010: University of Illinois 634: 555: 248:clouds in a gold tinge due to 13: 1: 1516:Stratus silvagenitus (St sil) 1374:Cumulonimbus flumen ((Cb flu) 1367:Cb-only accessories and other 1215:Altocumulus lacunosus (Ac la) 1099:Cirrocumulus floccus (Cc flo) 548: 1325:Cumulonimbus calvus (Cb cal) 1230:Altocumulus volutus (Ac vol) 1210:Altocumulus floccus (Ac flo) 904:Noctilucent type III billows 563:"Weather Facts: Altocumulus" 7: 1279:Nimbostratus virga (Ns vir) 1022:Cirrus castellanus (Ci cas) 531: 310:unidentified flying objects 283: 211:that belongs mainly to the 44:Altocumulus cloud formation 10: 1818: 1500:Stratus nebulosus (St neb) 1434:Cumulus congestus (Cu con) 1428:Cumulus mediocris (Cu med) 1063:Cirrus vertebratus (Ci ve) 907:Noctilucent type IV whirls 440: 219:and smaller than those of 1753: 1712: 1666: 1657: 1615: 1590: 1534: 1508: 1485: 1476: 1451: 1408: 1397: 1366: 1357:Cumulonimbus murus ((mur) 1346:Cumulonimbus cauda ((cau) 1338: 1315: 1304: 1295: 1260: 1242: 1186: 1177: 1157: 1121: 1075: 1050: 1037:Cirrus spissatus (Ci spa) 1012: 1003: 994: 985: 959: 940: 922: 901:Noctilucent type II bands 868: 624:"Altocumulus Castellanus" 370:Pattern-based varieties: 199: 'high' and 169: 157: 147: 137: 105: 79: 69: 57: 49: 37: 32: 1495:Stratus fractus (St fra) 1423:Cumulus humilis (Cu hum) 1402:Variable vertical extent 1352:Cumulonimbus incus (inc) 1027:Cirrus fibratus (Ci fib) 898:Noctilucent type I veils 892:Polar mesospheric clouds 744:. Vol. I. pp.  668:. Vol. I. pp.  593:. 1975. pp. 31–35. 466:Altocumulus lenticularis 27:Genus of mid-level cloud 1573:Stratocumulus Undulatus 1058:Cirrus intortus (Ci in) 1042:Cirrus uncinus (Ci unc) 1032:Cirrus floccus (Ci flo) 648:. TheAirlinePilots.com. 630:. TheAirlinePilots.com. 318:altocumulus castellanus 262:altocumulus castellanus 153:Family B (Medium-level) 1713:Supplementary features 1593:supplementary features 538:Atmospheric convection 454:Altocumulus perlucidus 293: 257: 201: 193: 1756:and human-made clouds 1252:Altostratus undulatus 961:Nitric acid and water 478:Altocumulus at sunset 291: 241: 1774:Homomutatus (homut) 1770:Homogenitus (hogen) 1740:Praecipitatio (pra) 952:Lenticular nacreous 250:Rayleigh scattering 245:Altocumulus floccus 1536:Stratocumulus (Sc) 1523:(Fg) Surface level 1464:Trade wind cumulus 949:Cirriform nacreous 807:2006-10-17 at the 785:2011-10-08 at the 294: 258: 33:Altocumulus clouds 1789: 1788: 1785: 1784: 1781: 1780: 1699:Translucidus (tr) 1653: 1652: 1586: 1585: 1530: 1529: 1472: 1471: 1393: 1392: 1309:Towering vertical 1306:Cumulonimbus (Cb) 1291: 1290: 1287: 1286: 1262:Nimbostratus (Ns) 1238: 1237: 1173: 1172: 1153: 1152: 1123:Cirrostratus (Cs) 1117: 1116: 1077:Cirrocumulus (Cc) 1071: 1070: 1051:Ci-only varieties 981: 980: 977: 976: 918: 917: 914: 913: 514:Altocumulus mamma 182: 181: 143:(7,000–23,000 ft) 16:(Redirected from 1809: 1664: 1663: 1644:Actinoform cloud 1541: 1540: 1483: 1482: 1406: 1405: 1380:Overshooting top 1313: 1312: 1302: 1301: 1269: 1268: 1244:Altostratus (As) 1193: 1192: 1188:Altocumulus (Ac) 1184: 1183: 1128: 1127: 1082: 1081: 1010: 1009: 1001: 1000: 992: 991: 938: 937: 929: 928: 884: 883: 875: 874: 843: 836: 829: 820: 819: 767: 766: 764: 762: 732: 726: 725: 723: 721: 715: 708: 697: 691: 690: 688: 686: 656: 650: 649: 638: 632: 631: 620: 611: 610: 608: 607: 580: 574: 573: 571: 570: 559: 523: 511: 499: 487: 475: 463: 451: 306:lenticular cloud 213:stratocumuliform 161:Middle-altitude 65: 42: 30: 29: 21: 1817: 1816: 1812: 1811: 1810: 1808: 1807: 1806: 1792: 1791: 1790: 1777: 1766: 1755: 1749: 1720:Asperitas (asp) 1708: 1689:Perlucidus (pe) 1674:Duplicatus (du) 1659: 1649: 1646:(Stratocumulus) 1619:accessory cloud 1617: 1611: 1592: 1582: 1526: 1504: 1468: 1447: 1401: 1389: 1362: 1334: 1308: 1297: 1283: 1264: 1256: 1234: 1179: 1169: 1159: 1158:High-level-only 1149: 1113: 1067: 1046: 996: 973: 962: 955: 933: 932:Very high-level 910: 891: 879: 864: 847: 809:Wayback Machine 787:Wayback Machine 776: 771: 770: 760: 758: 756: 733: 729: 719: 717: 716:on 25 July 2016 713: 706: 698: 694: 684: 682: 680: 657: 653: 640: 639: 635: 622: 621: 614: 605: 603: 601: 589:. Vol. I. 582: 581: 577: 568: 566: 565:. 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Retrieved 740: 730: 718:. Retrieved 711:the original 702: 695: 683:. Retrieved 664: 654: 645: 636: 627: 604:. Retrieved 585: 578: 567:. Retrieved 557: 543:Mackerel sky 391: 383: 379: 371: 360: 352: 345:Translucidus 344: 301:stratiformis 278:mackerel sky 274:cumulonimbus 259: 244: 243: 224: 217:cirrocumulus 200: 192: 184: 183: 128:Translucidus 96:Stratiformis 93:Lenticularis 50:Abbreviation 1745:Virga (vir) 1735:Mamma (mam) 1725:Cavum (cav) 1684:Opacus (op) 1633:Velum (vel) 1606:Tuba ((tub) 1359:Wall cloud) 1348:Tail cloud) 1265:Multi-level 1005:Cirrus (Ci) 888:Noctilucent 870:Mesospheric 802:Altocumulus 270:troposphere 209:cloud genus 185:Altocumulus 87:Castellanus 18:Altocumulus 1658:Non-height 995:High-level 606:2014-08-26 569:2015-02-03 549:References 380:duplicatus 353:perlucidus 254:Norah Head 229:convection 225:cumuliform 187:(from 158:Appearance 122:Perlucidus 113:Duplicatus 1667:Varieties 1621:and other 1459:Horseshoe 1385:Hot tower 1296:Low-level 1272:Varieties 761:26 August 720:26 August 685:26 August 392:Lacunosus 384:undulatus 131:Undulatus 116:Lacunosus 1796:Category 1660:specific 934:15–30 km 880:80–85 km 805:Archived 783:Archived 532:See also 372:Radiatus 284:Subtypes 138:Altitude 125:Radiatus 1802:Cumulus 1642:Other- 1545:Species 1487:Species 1418:Fractus 1410:Species 1317:Species 1197:Species 1132:Species 1086:Species 1014:Species 997:3–18 km 441:Gallery 326:floccus 324:8. The 203:cumulus 107:Variety 99:Volutus 90:Floccus 81:Species 1602:Shelf) 1298:0–2 km 1180:2–8 km 853:genera 752:  676:  646:Clouds 628:Clouds 597:  405:shear. 361:opacus 119:Opacus 58:Symbol 1452:Other 890:(NLC) 850:Cloud 746:22–24 714:(PDF) 707:(PDF) 670:17–20 242:Some 233:front 195:altus 191: 189:Latin 176:Virga 71:Genus 1442:ICAO 763:2014 750:ISBN 722:2014 687:2014 674:ISBN 595:ISBN 351:3), 178:only 1521:Fog 861:WMO 382:or 252:in 1798:: 859:- 748:. 672:. 644:. 626:. 615:^ 427:6. 363:(C 355:(C 347:(C 336:9. 280:. 53:Ac 1440:( 1436:( 1432:( 842:e 835:t 828:v 765:. 724:. 689:. 609:. 572:. 425:M 423:C 388:M 376:M 365:M 357:M 349:M 334:M 330:M 322:M 314:M 256:. 20:)

Index

Altocumulus


Genus
Species
Variety
Classification
Stratocumulus
Precipitation
Virga
Latin
altus
cumulus
cloud genus
cirrocumulus
stratocumulus
convection
front

Rayleigh scattering
Norah Head
altocumulus castellanus
thunderstorms
troposphere
cumulonimbus
mackerel sky

stratiformis
lenticular cloud
unidentified flying objects

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