Cirrus fibratus

Short description: Type of cloud

Cirrus fibratus

Abbreviation| Ci fib
Symbol|
Genus| Cirrus (curl)
Species| fibratus (fibered)
Altitude| Above 6,000 m
(Above 20,000 ft)
Classification| Family A (High-level)
Appearance| fibers, threads[1]
Precipitation cloud?| No

Cirrus fibratus, also called cirrus filosus,[2] is a type of cirrus cloud. The name cirrus fibratus is derived from Latin, meaning "fibrous".[3] These clouds are similar to cirrus uncinus, commonly known as "mares' tails," yet different in that fibratus clouds do not have tufts or hooks at the end.[4] The filaments are usually separate from one another.[5]

Like other cirrus clouds, cirrus fibratus occurs at high altitudes. They can indicate an approaching warm front[6] and can also be an indication that fair weather will follow.[7] Fibratus clouds indicate high, continuous winds up at cloud level.

## See also

* List of cloud types

## References

1. ↑ Wolken Online. "Cirrus". Cloud Atlas. http://www.clouds-online.com/cloud_atlas/cirrus/cirrus.htm. Retrieved 13 July 2011.
2. ↑ "Appendix 3 - History of cloud nomenclature". https://cloudatlas.wmo.int/en/appendix-3-history-of-cloud-nomenclature.html#cirrus.
3. ↑ Numen - The Latin Lexicon. "Definition of fibratus, fibratus". http://latinlexicon.org/definition.php?p1=2022232&p2=f&p3=2. Retrieved 13 July 2011.
4. ↑ Dunlop, Storm (2003). The weather identification handbook (1st Lyons Press ed.). Guilford, Conn.: Lyons Press. pp. 56. ISBN 1-58574-857-9. https://books.google.com/books?id=KoZMvgAACAAJ.
5. ↑ Callanan, Martin. "Cirrus fibratus". International Cloud Atlas. nephology.eu. http://nephology.eu/cirrus/cirrus-fibratus. Retrieved 13 July 2011.
6. ↑ Wolstanton Weather. "Cumulus Clouds". Clouds. Archived from the original on 27 March 2012. https://web.archive.org/web/20120327014352/http://www.wolstanton.org.uk/public_html/web_weather/web/gallery_clouds_cirrus.php. Retrieved 13 July 2011.
7. ↑ The Weather Observer. "Cirrus Fibratus (Ci fib)". http://www.theweatherobserver.com/?p=71. Retrieved 13 July 2011.

## External links

* International Cloud Atlas - Cirrus fibratus

Template:Cirrus cloud types

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[[Earth:ClCloud List of cloud types|genera]] and selected species, supplementary features, and other airborne hydrometeors - WMO Latin terminology except where indicated

Mesospheric|

| Extreme-level
80-85 km|

| Noctilucent (NLC)
polar mesospheric clouds|

Noctilucent
Polar mesospheric clouds

|

Stratospheric|

| Very High-level
15-30 km|

| Nacreous clouds|

Nacreous

|

Nitric acid and water
polar stratospheric clouds (PSC)|

Nitric acid and water polar stratospheric clouds

Tropospheric|

| High-level
3-18 km|

| Cirrus (Ci)|

| Species|

* Cirrus castellanus (Ci cas)
* Cirrus fibratus (Ci fib)
* Cirrus floccus (Ci flo)
* Cirrus spissatus (Ci spa)
* Cirrus uncinus (Ci unc)

|

Ci only varieties|

* Cirrus intortus (Ci in)
* Cirrus vertebratus (Ci ve)

Cirrocumulus (Cc)|

| Species|

* Cirrocumulus castellanus (Cc cas)
* Cirrocumulus floccus (Cc flo)
* Cirrocumulus lenticularis (Cc len)
* Cirrocumulus stratiformis (Cc str)

|

Cirrostratus (Cs)|

| Species|

* Cirrostratus fibratus (Cs fib)
* Cirrostratus nebulosus (Cs neb)

|

High-level only
accessory and other|

(Homomutatus (homut) Contrail)

Medium-level
2-8 km|

| Altocumulus (Ac)|

| Species|

Altocumulus castellanus (Ac cas)
Altocumulus floccus (Ac flo)
Altocumulus lenticularis (Ac len)
Altocumulus stratiformis (Ac str)
Altocumulus volutus (Ac vol)

|

Altostratus (As)|

Altostratus (As)

Nimbostratus (Ns)|

Nimbostratus (Ns)

Low-level
0-2 km|

| Cumulonimbus (Cb)|

| Species|

Cumulonimbus calvus (Cb cal)
Cumulonimbus capillatus (Cb cap)

|

Cb Only Supplementary features|

Cumulonimbus cauda ((cau) Tail cloud)
Cumulonimbus incus (inc)
Cumulonimbus murus ((mur) Wall cloud)

Cb only Accessories & Other|

Cumulonimbus flumen ((Cb flu) Beaver tail)
Overshooting top
Hot tower

Cumulus (Cu)|

| Species|

Fractus
Cumulus humilis (Cu hum)
Cumulus mediocris (Cu med)
Cumulus congestus (Cu con) (ICAO term Towering cumulus [Tcu])

|

Other|

Horseshoe

Stratus (St)|

| Species|

Stratus fractus (St fra)
Stratus nebulosus (St neb)

|

St only Accessories & Other|

Stratus silvagenitus (St sil)
Fog

Stratocumulus (Sc)|

| Species|

Stratocumulus castellanus (Sc cas)
Stratocumulus floccus (Sc flo)
Stratocumulus lenticularis (Sc len)
Stratocumulus stratiformis (Sc str)
Stratocumulus volutus (Sc vol)

|

Low-level only
supplementary features|

Arcus ((arc) Shelf)
Tuba ((tub) Funnel cloud)

Low-level only
accessory and other|

Pileus (pil)
Velum (vel)
Flammagenitus (flgen)
Cataractagenitus (cagen)

Non-height
specific|

| Varieties|

Duplicatus (du)
Lacunosus (la)
Opacus (op)
Perlucidus (pe)
Radiatus (ra)
Translucidus (tr)
Undulatus (un)

|

Supplementary features|

Asperitas (asp)
Cavum (cav)
Fluctus (flu)
Mamma (mam)
Praecipitatio (pra)
Virga (vir)

accessory and other|

Accessory cloud
Pannus (pan)
Homogenitus (hogen)
Actinoform cloud

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