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Atmospheric instability

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the (higher) altitude to which it was displaced. This usually creates vertically developed clouds from convection, due to the rising motion, which can eventually lead to thunderstorms. It could also be created in other phenomenon, such as a cold front. Even if the air is cooler on the surface, there is still warmer air in the mid-levels, that can rise into the upper-levels. However, if there is not enough water vapor present, there is no ability for condensation, thus storms, clouds, and rain will not form.
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then the lower portion of the atmosphere is unstable, with thunderstorms expected when the value is below −3. The application of the Showalter index is especially helpful when there is a cool, shallow air mass below 850 hPa that conceals the potential convective lifting. However, the index will underestimate the potential convective lifting if there are cool layers that extend above 850 hPa and it does not consider
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the dry adiabatic lapse rate. In a completely moist troposphere, a temperature decrease with height less than 6 °C (11 °F) per kilometer ascent indicates stability, while greater changes indicate instability. In the range between 6 °C (11 °F) and 9.8 °C (17.6 °F) temperature decrease per kilometer ascent, the term conditionally unstable is used.
488:, and are propelled by the transfer of energy from an oncoming storm and are shaped by gravity. The ripple-like appearance of this wave is described as the disturbance in the water when a pebble is dropped into a pond or when a moving boat creates waves in the surrounding water. The object displaces the water or 211:
Whether or not the atmosphere has stability depends partially on the moisture content. In a very dry troposphere, a temperature decrease with height less than 9.8 °C (17.6 °F) per kilometer ascent indicates stability, while greater changes indicate instability. This lapse rate is known as
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It is a form of fluid instability found in thermally stratified atmospheres in which a colder fluid overlies a warmer one. When an air mass is unstable, the element of the air mass that is displaced upwards is accelerated by the pressure differential between the displaced air and the ambient air at
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The Showalter index is a dimensionless number computed by taking the temperature at the 850 hPa level which is then taken dry adiabatically up to saturation, then up to the 500 hPa level, which is then subtracted by the observed 500 hPa level temperature. If the value is negative,
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The Bulk Richardson Number (BRN) is a dimensionless number relating vertical stability and vertical wind shear (generally, stability divided by shear). It represents the ratio of thermally-produced turbulence and turbulence generated by vertical shear. Practically, its value determines whether
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Within an unstable layer in the troposphere, the lifting of air parcels will occur, and continue for as long as the nearby atmosphere remains unstable. Once overturning through the depth of the troposphere occurs (with convection being capped by the relatively warmer, more stable layer of the
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When winds are light, dust devils can develop on dry days within a region of instability at ground level. Small-scale, tornado-like circulations can occur over or near any intense surface heat source, which would have significant instability in its vicinity. Those that occur near intense
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Stable conditions, such as during a clear and calm night, will cause pollutants to become trapped near ground level. Drizzle occurs within a moist air mass when it is stable. Air within a stable layer is not turbulent. Conditions associated with a
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Advances in tropical meteorology: meteorology and national development: proceedings of the National Symposium TROPMET-93 organised by the Indian Meteorological Society at New Delhi from March 17–19, 1993 with the theme "meteorology and national
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is highly variable through distance and time. Atmospheric instability encourages vertical motion, which is directly correlated to different types of weather systems and their severity. For example, under unstable conditions, a lifted
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the wave is travelling through and the medium moves in an upward motion. However, because of gravity, the water or medium is pulled back down and the repetition of this cycle creates the transverse wave motion.
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The temperature difference between 850 hPa (5,000 feet (1,500 m) above sea level) and 500 hPa (18,000 feet (5,500 m) above sea level) is used to parameterize the vertical temperature lapse rate.
259:). When the value is positive, the atmosphere (at the respective height) is stable and when the value is negative, the atmosphere is unstable. Thunderstorms are expected with values below −2, and 374:, which is expressed as B+ or simply B. As with CAPE, CIN is usually expressed in J/kg but may also be expressed as m/s, as the values are equivalent. In fact, CIN is sometimes referred to as 514:), deep convective currents lead to thunderstorm development when enough moisture is present. Over warm ocean waters and within a region of the troposphere with light vertical 403:; low values indicate weak instability and/or strong vertical shear. Generally, values in the range of around 10 to 45 suggest environmental conditions favorable for 337:
The vertical extent of the moist layer is represented by the difference of the 700 hPa temperature (10,000 feet (3,000 m) above sea level) and 700 hPa dew point.
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approaches a layer of cold, stable air. The approaching boundary will create a disturbance in the atmosphere producing a wave-like motion, known as a
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and warm lakes are also suitable locations for a steam devil to form, when cold arctic air passes over the relatively warm water.
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of an air parcel and is an indicator of atmospheric instability, which makes it valuable in predicting severe weather. CIN,
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a parcel of air would have if lifted a certain distance vertically through the atmosphere. CAPE is effectively the positive
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Martin Setvak; Jochen Kerkmann; Alexander Jacob; HansPeter Roesli; Stefano Gallino & Daniel Lindsey (2007-03-19).
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will find cooler and denser surrounding air, making the parcel prone to further ascent, in a positive feedback loop.
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Convective available potential energy (CAPE), sometimes, simply, available potential energy (APE), is the amount of
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and significant low level spin (or vorticity), such thunderstorm activity can grow in coverage and develop into a
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is produced through the horizontal movement of air and the physical forces it is subjected to such as the
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The K index is derived arithmetically: K-index = (850 hPa temperature – 500 hPa temperature) + 850 hPa
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are called fire whirls, which can spread a fire beyond its previous bounds. A steam devil is a
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Michael Vollmer (March 2009). "Mirrors in the air: mirages in nature and in the laboratory".
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The 850 hPa dew point provides information on the moisture content of the lower atmosphere.
193:; resulting dynamic lifting and mixing produces cloud, precipitation and storms often on a 141: 8: 1451: 1436: 489: 400: 1040: 969: 889:"Outflow from convective storm, Mauritania and adjacent Atlantic Ocean (13 August 2006)" 852: 726: 1223: 1066: 981: 1048: 1504: 1400: 1288: 1130: 1052: 1009: 985: 977: 867: 831: 804: 763: 669: 641: 484:. Although the undular bore waves appear as bands of clouds across the sky, they are 248: 176: 1087: 1044: 973: 850: 730: 519: 485: 477: 1028: 1155: 696: 622: 604: 689: 1446: 260: 186: 935: 699:
National Weather Service Central Region Headquarters. Retrieved on 2011-02-24
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Condition where the Earth's atmosphere is generally considered to be unstable
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Stephen J. Pyne; Patricia L. Andrews & Richard D. Laven (1996-04-26).
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National Weather Service Forecast Office, Detroit, Michigan (2010-01-25).
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Mirage over a hot road, with the appearance of "fake water" on its surface
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Explanation of Atmospheric Stability/Instability - by Steve W. Woodruff
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is free or forced. High values indicate unstable and/or weakly sheared
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Frequently Asked Questions: Hurricanes, Typhoons and Tropical Cyclones
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Tp(p) at a given pressure height in the troposphere, usually 500
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Effects of atmospheric instability in moist atmospheres include
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National Audubon Society field guide to North American weather
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There are two primary forms of atmospheric instability. Under
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National Weather Service Office, Oxnard, California (2012).
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in the form of rising warm air leads to the development of
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Conditions favorable for thunderstorm types and complexes
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can form. Stable atmospheres can be associated with
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Atlantic Oceanographic and Meteorological Laboratory
1035:. Vol. 86. John Wiley and Sons. p. 77. 1540: 97:development, which over warm oceans can lead to 1008:. Random House Digital, Inc. pp. 520–523. 955: 754: 803:. Butterworth-Heinemann. pp. 28/8–28/10. 796: 633: 366:, is effectively negative buoyancy, expressed 1103: 823: 472:can form when a low level boundary such as a 420:radiative changes or moisture below 850 hPa. 1252:Convective available potential energy (CAPE) 872:: CS1 maint: multiple names: authors list ( 784:"NOAA's National Weather Service - Glossary" 372:convective available potential energy (CAPE) 243:The lifted index (LI), usually expressed in 76:convective available potential energy (CAPE) 762:. Concept Publishing Company. p. 347. 668:. Pearson Prentice Hall. pp. 416–418. 549:. They can form from smoke issuing from a 1110: 1096: 880: 664:Edward Aguado & James E. Burt (2007). 918: 389: 500: 427: 345: 140: 18: 200: 1541: 1002:David McWilliams Ludlum (1991-10-15). 997: 995: 659: 657: 496: 1091: 709:M. W. Moncrieff; M.J. Miller (1976). 263:is anticipated with values below −6. 226:Convective available potential energy 458: 1214:Convective condensation level (CCL) 992: 912: 654: 13: 1420:Equivalent potential temperature ( 580:Stable and unstable stratification 410: 216:Indices used for its determination 14: 1565: 1272:Conditional symmetric instability 1118:Meteorological data and variables 666:Understanding weather and climate 637:Encyclopedia of world climatology 1219:Lifting condensation level (LCL) 924:"How do tropical cyclones form?" 105:. In dry atmospheres, inferior 1204:Cloud condensation nuclei (CCN) 1022: 949: 844: 817: 800:Plant Engineer's Reference Book 341: 327:– 700 hPa dew point depression 301:Widely scattered thunderstorms 238: 1467:Wet-bulb potential temperature 1309:Level of free convection (LFC) 827:Jar professional pilot studies 790: 776: 748: 702: 682: 627: 609: 591: 1: 1510:Pressure-gradient force (PGF) 1432:Sea surface temperature (SST) 1267:Convective momentum transport 1049:10.1016/S0168-1923(97)00032-4 1032:Introduction to wildland fire 797:Dennis A. Snow (2003-01-01). 585: 1324:Bulk Richardson number (BRN) 824:Phil Croucher (2004-03-01). 129:, a lack of turbulence, and 7: 1528:Maximum potential intensity 1294:Free convective layer (FCL) 1257:Convective inhibition (CIN) 830:. Lulu.com. pp. 8–29. 563: 10: 1570: 1554:Atmospheric thermodynamics 1462:Wet-bulb globe temperature 1319:Maximum parcel level (MPL) 978:10.1088/0031-9120/44/2/008 570:Atmospheric thermodynamics 439: 423: 266: 219: 204: 1518: 1480: 1442:Thermodynamic temperature 1376:Forest fire weather index 1332: 1242: 1189: 1123: 640:. Springer. p. 449. 603:February 9, 2008, at the 277:Thunderstorm probability 163:, thermal mixing through 149:in the mature stage over 38:is a condition where the 1364:Equivalent temperature ( 1277:Convective temperature ( 1161:Surface weather analysis 853:"Climate of Los Angeles" 755:Rattan K. Datta (1996). 309:Scattered thunderstorms 136: 1411:Potential temperature ( 1156:Surface solar radiation 634:John E. Oliver (2005). 376:negative buoyant energy 317:Numerous thunderstorms 293:Isolated thunderstorms 191:pressure gradient force 36:Atmospheric instability 1401:Relative humidity (RH) 1289:Equilibrium level (EL) 1262:Convective instability 735:10.1002/qj.49710243208 715:Q. J. R. Meteorol. Soc 621:June 12, 2008, at the 506: 437: 390:Bulk Richardson Number 351: 222:Bulk Richardson Number 160:convective instability 154: 151:Swifts Creek, Victoria 64:Bulk Richardson Number 46:and as a result local 32: 504: 431: 364:convective inhibition 349: 230:K-index (meteorology) 144: 99:tropical cyclogenesis 22: 1549:Atmospheric dynamics 1490:Atmospheric pressure 1457:Wet-bulb temperature 1359:Dry-bulb temperature 1354:Dew point depression 201:Cause of instability 113:, steam devils, and 82:changes through the 42:is considered to be 1452:Virtual temperature 1437:Temperature anomaly 1131:Adiabatic processes 1041:1997AgFM...86..140U 970:2009PhyEd..44..165V 727:1976QJRMS.102..373M 497:Unstable atmosphere 182:Dynamic instability 1224:Precipitable water 695:2012-11-30 at the 507: 438: 370:; the opposite of 352: 155: 40:Earth's atmosphere 33: 1536: 1535: 1505:Pressure gradient 1314:Lifted index (LI) 1058:978-0-471-54913-0 1015:978-0-679-40851-2 958:Physics Education 837:978-0-9681928-2-5 810:978-0-7506-4452-5 769:978-81-7022-532-4 675:978-0-13-149696-5 647:978-1-4020-3264-6 459:Stable atmosphere 321: 320: 177:convective storms 1561: 1112: 1105: 1098: 1089: 1088: 1083: 1082: 1076: 1072: 1070: 1062: 1026: 1020: 1019: 999: 990: 989: 953: 947: 946: 944: 943: 934:. 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Archived from 706: 700: 686: 680: 679: 661: 652: 651: 631: 625: 613: 607: 598:Stability of Air 595: 520:tropical cyclone 486:transverse waves 478:outflow boundary 271: 270: 86:with height, or 23:A dust devil in 1569: 1568: 1564: 1563: 1562: 1560: 1559: 1558: 1539: 1538: 1537: 1532: 1514: 1476: 1426: 1370: 1348: 1328: 1283: 1238: 1185: 1119: 1116: 1086: 1074: 1073: 1064: 1063: 1059: 1027: 1023: 1016: 1000: 993: 954: 950: 941: 939: 917: 913: 904: 902: 901:on 25 July 2011 898: 891: 885: 881: 865: 864: 858: 856: 849: 845: 838: 822: 818: 811: 795: 791: 782: 781: 777: 770: 753: 749: 741: 721:(432): 373–94. 707: 703: 697:Wayback Machine 687: 683: 676: 662: 655: 648: 632: 628: 623:Wayback Machine 614: 610: 605:Wayback Machine 596: 592: 588: 566: 499: 461: 456: 426: 413: 411:Showalter index 392: 344: 269: 241: 236: 218: 209: 203: 139: 17: 12: 11: 5: 1567: 1557: 1556: 1551: 1534: 1533: 1531: 1530: 1524: 1522: 1516: 1515: 1513: 1512: 1507: 1502: 1497: 1492: 1486: 1484: 1478: 1477: 1475: 1474: 1469: 1464: 1459: 1454: 1449: 1447:Vapor pressure 1444: 1439: 1434: 1429: 1424: 1417: 1408: 1403: 1398: 1393: 1388: 1383: 1378: 1373: 1368: 1361: 1356: 1351: 1346: 1338: 1336: 1330: 1329: 1327: 1326: 1321: 1316: 1311: 1306: 1301: 1296: 1291: 1286: 1281: 1274: 1269: 1264: 1259: 1254: 1248: 1246: 1240: 1239: 1237: 1236: 1231: 1226: 1221: 1216: 1211: 1206: 1201: 1195: 1193: 1187: 1186: 1184: 1183: 1178: 1173: 1168: 1163: 1158: 1153: 1148: 1143: 1138: 1133: 1127: 1125: 1121: 1120: 1115: 1114: 1107: 1100: 1092: 1085: 1084: 1075:|journal= 1057: 1021: 1014: 991: 948: 911: 879: 843: 836: 816: 809: 789: 775: 768: 747: 744:on 2012-12-16. 701: 681: 674: 653: 646: 626: 608: 589: 587: 584: 583: 582: 577: 572: 565: 562: 541:that involves 498: 495: 460: 457: 425: 422: 412: 409: 391: 388: 343: 340: 339: 338: 335: 332: 319: 318: 315: 311: 310: 307: 303: 302: 299: 295: 294: 291: 287: 286: 283: 279: 278: 275: 268: 265: 261:severe weather 240: 237: 217: 214: 202: 199: 195:synoptic scale 187:Coriolis force 138: 135: 15: 9: 6: 4: 3: 2: 1566: 1555: 1552: 1550: 1547: 1546: 1544: 1529: 1526: 1525: 1523: 1521: 1517: 1511: 1508: 1506: 1503: 1501: 1500:Barotropicity 1498: 1496: 1493: 1491: 1488: 1487: 1485: 1483: 1479: 1473: 1470: 1468: 1465: 1463: 1460: 1458: 1455: 1453: 1450: 1448: 1445: 1443: 1440: 1438: 1435: 1433: 1430: 1428: 1423: 1418: 1416: 1414: 1409: 1407: 1404: 1402: 1399: 1397: 1394: 1392: 1389: 1387: 1384: 1382: 1379: 1377: 1374: 1372: 1367: 1362: 1360: 1357: 1355: 1352: 1350: 1345: 1340: 1339: 1337: 1335: 1331: 1325: 1322: 1320: 1317: 1315: 1312: 1310: 1307: 1305: 1302: 1300: 1297: 1295: 1292: 1290: 1287: 1285: 1280: 1275: 1273: 1270: 1268: 1265: 1263: 1260: 1258: 1255: 1253: 1250: 1249: 1247: 1245: 1241: 1235: 1232: 1230: 1229:Precipitation 1227: 1225: 1222: 1220: 1217: 1215: 1212: 1210: 1207: 1205: 1202: 1200: 1197: 1196: 1194: 1192: 1188: 1182: 1179: 1177: 1174: 1172: 1169: 1167: 1164: 1162: 1159: 1157: 1154: 1152: 1149: 1147: 1144: 1142: 1139: 1137: 1134: 1132: 1129: 1128: 1126: 1122: 1113: 1108: 1106: 1101: 1099: 1094: 1093: 1090: 1080: 1068: 1060: 1054: 1050: 1046: 1042: 1038: 1034: 1033: 1025: 1017: 1011: 1007: 1006: 998: 996: 987: 983: 979: 975: 971: 967: 963: 959: 952: 938:on 2009-08-27 937: 933: 929: 925: 921: 920:Chris Landsea 915: 897: 890: 883: 875: 869: 854: 847: 839: 833: 829: 828: 820: 812: 806: 802: 801: 793: 785: 779: 771: 765: 761: 760: 751: 740: 736: 732: 728: 724: 720: 716: 712: 705: 698: 694: 691: 690:Gloassary: K. 685: 677: 671: 667: 660: 658: 649: 643: 639: 638: 630: 624: 620: 617: 612: 606: 602: 599: 594: 590: 581: 578: 576: 573: 571: 568: 567: 561: 559: 555: 552: 548: 544: 540: 537: 533: 527: 525: 521: 517: 513: 503: 494: 491: 487: 483: 479: 475: 471: 470:Undular bores 467: 455: 451: 447: 443: 435: 430: 421: 419: 408: 407:development. 406: 402: 398: 387: 383: 381: 377: 373: 369: 365: 361: 357: 348: 336: 333: 330: 329: 328: 326: 316: 313: 312: 308: 305: 304: 300: 297: 296: 292: 289: 288: 284: 282:Less than 20 281: 280: 276: 274:K-index value 273: 272: 264: 262: 258: 254: 250: 249:adiabatically 246: 235: 231: 227: 223: 213: 208: 198: 196: 192: 188: 184: 183: 178: 174: 173:precipitation 171:and possibly 170: 166: 162: 161: 152: 148: 145:Anvil shaped 143: 134: 132: 128: 127:air pollution 124: 120: 116: 112: 108: 104: 100: 96: 91: 89: 85: 81: 77: 73: 69: 65: 61: 56: 54: 53:parcel of air 49: 45: 41: 37: 30: 26: 21: 1421: 1412: 1406:Mixing ratio 1381:Haines Index 1365: 1343: 1278: 1191:Condensation 1031: 1024: 1004: 961: 957: 951: 940:. Retrieved 936:the original 927: 914: 903:. Retrieved 896:the original 882: 857:. Retrieved 846: 826: 819: 799: 792: 778: 759:development" 757: 750: 739:the original 718: 714: 704: 684: 665: 636: 629: 611: 593: 528: 512:stratosphere 508: 482:gravity wave 466:marine layer 462: 454:Undular bore 450:Thunderstorm 434:undular bore 432:Image of an 414: 401:environments 393: 384: 379: 375: 367: 353: 342:CAPE and CIN 322: 242: 239:Lifted Index 234:Lifted index 210: 180: 158: 156: 147:thundercloud 131:undular bore 125:, increased 95:thunderstorm 92: 68:lifted index 57: 35: 34: 1495:Baroclinity 1342:Dew point ( 1334:Temperature 1234:Water vapor 558:Hot springs 551:power plant 153:, Australia 133:formation. 115:fire whirls 111:dust devils 84:troposphere 80:temperature 60:meteorology 1543:Categories 1472:Wind chill 1386:Heat index 1244:Convection 1181:Wind shear 1166:Visibility 1146:Lapse rate 964:(2): 167. 942:2006-07-25 905:2009-07-03 859:2012-02-16 742:(abstract) 586:References 554:smokestack 516:wind shear 474:cold front 442:Dust devil 440:See also: 397:convection 220:See also: 207:Lapse rate 205:See also: 165:convection 103:turbulence 88:lapse rate 1171:Vorticity 1151:Lightning 1136:Advection 1077:ignored ( 1067:cite book 986:121672201 532:wildfires 405:supercell 325:dew point 314:Above 35 306:31 to 35 298:26 to 30 290:20 to 25 1520:Velocity 1482:Pressure 1396:Humidity 1299:Helicity 1141:Buoyancy 868:cite web 693:Archived 619:Archived 601:Archived 575:Buoyancy 564:See also 536:rotating 360:buoyancy 44:unstable 1391:Humidex 1304:K Index 1124:General 1037:Bibcode 966:Bibcode 786:. NOAA. 723:Bibcode 539:updraft 524:mirages 424:Effects 418:diurnal 267:K Index 245:kelvins 119:drizzle 107:mirages 72:K-index 48:weather 1055:  1012:  984:  834:  807:  766:  672:  644:  490:medium 452:, and 446:Mirage 356:energy 232:, and 169:clouds 101:, and 25:Ramadi 1199:Cloud 982:S2CID 899:(PDF) 892:(PDF) 547:smoke 543:steam 285:None 137:Forms 1176:Wind 1079:help 1053:ISBN 1010:ISBN 874:link 832:ISBN 805:ISBN 764:ISBN 670:ISBN 642:ISBN 436:wave 189:and 90:. 29:Iraq 1209:Fog 1045:doi 974:doi 731:doi 719:120 545:or 476:or 382:). 380:NBE 253:hPa 179:. 175:or 123:fog 58:In 1545:: 1071:: 1069:}} 1065:{{ 1051:. 1043:. 994:^ 980:. 972:. 962:44 960:. 930:. 926:. 922:. 870:}} 866:{{ 729:. 717:. 713:. 656:^ 556:. 526:. 448:, 444:, 368:B- 257:mb 228:, 224:, 197:. 121:, 109:, 74:, 70:, 66:, 27:, 1427:) 1425:e 1422:θ 1415:) 1413:θ 1371:) 1369:e 1366:T 1349:) 1347:d 1344:T 1284:) 1282:c 1279:T 1111:e 1104:t 1097:v 1081:) 1061:. 1047:: 1039:: 1018:. 988:. 976:: 968:: 945:. 908:. 876:) 862:. 840:. 813:. 772:. 733:: 725:: 678:. 650:. 378:( 255:( 31:.

Index


Ramadi
Iraq
Earth's atmosphere
unstable
weather
parcel of air
meteorology
Bulk Richardson Number
lifted index
K-index
convective available potential energy (CAPE)
temperature
troposphere
lapse rate
thunderstorm
tropical cyclogenesis
turbulence
mirages
dust devils
fire whirls
drizzle
fog
air pollution
undular bore

thundercloud
Swifts Creek, Victoria
convective instability
convection

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