1 / 32

Moisture

Moisture. Gulf of Mexico – near surface moisture Gulf of California and Pacific Ocean – mid to high level “monsoon” moisture. Cold Front cold air undercuts warm air Warm Front warm air overruns cold air Stationary Front a stalled front Dry Line dry air undercuts moist air

waldo
Télécharger la présentation

Moisture

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Moisture Gulf of Mexico – near surface moisture Gulf of California and Pacific Ocean – mid to high level “monsoon” moisture

  2. Cold Frontcold air undercuts warm air Warm Frontwarm air overruns cold air Stationary Fronta stalled front Dry Linedry air undercuts moist air Low Pressure Areasdraws air in and lifts it Thunderstorm Outflowcold air flowing out from astorm undercuts warm air Lifting mechanisms Hills / Mountains

  3. Upper-level disturbance and jet streak draws air skyward. Upper Level Disturbance L

  4. The ground heats the air…

  5. Buoyancy The tendency or capacity to remain afloat in a liquid or rise in the air. The upward force that a fluid exerts on an object less dense than itself.

  6. Buoyancy

  7. Buoyancy

  8. Buoyancy

  9. Buoyancy

  10. Buoyancy

  11. BuoyancyWhy storms DON’T form on some warm and humid days In cloud temps Environmental temps

  12. BuoyancyWhy storms DON’T form on some warm and humid days

  13. 20,000 ft 0F 15,000 ft 25F 10,000 ft 40F 5,000 ft 62F 0 ft 85F 9 27 45 63 Buoyancy A cloud forms…so the parcel will cool more slowly at a rate of 3.5F/1000 Feet. At 3000 Feet Parcel Temp drops to 70F . 5F / 1000 Ft

  14. Buoyancy In cloud temps Environmental temps

  15. Overshooting tops

  16. Buoyancyas buoyancy INCREASES,updraft strength INCREASES

  17. Weather Radar VIL VIL – Vertically Integrated Liquid. (KG/M2) VIL = 63 VIL is a measure of the updraft strength and a good hail indicator.

  18. Weather Radar VIL VIL – Vertically Integrated Liquid. (KG/M2) VIL is a measure of the updraft strength and a good hail indicator.

  19. Mid- and Long-distance cloud features Courtesy Evan Bookbinder

  20. Single Cell Cluster Squall Line Supercell Thunderstorm Spectrum Short-Lived Severe Pulse Severe Rotating Updraft

  21. - Weak winds aloft. - Very buoyant air can result in strong, nearly vertical updrafts. - As the downdraft overwhelms the updraft (falls through the updraft), ONLY a short period of rain, wind, and possible hail occurs. “Pulse” storms

  22. Initial Later Finally “Pulse” stormupdraft sequence Storm is initially dominated by the updraft, Then after a short time...the downdraft overwhelms (falls through) the updraft

  23. Multicell cluster

  24. “Multicell” line stormsSquall lines

  25. Shelf clouds occur on the edge of the updraft- downdraft interface Shelf clouds slope down AWAY from the rain When you see a shelf cloud, think strong winds Squall line – shelf clouds

  26. Formed by 2 different air-masses interacting Shelf cloud Cool Outflow

  27. Often turbulent with small scale twisting and curling motions in clouds. • - Motion is neither organized nor persistent. • - Scud clouds may form and dissipate rapidly. “Accessory” Clouds

  28. “Multicell” – Squall line Radar View

  29. Bow Echoes / Squall Line As winds aloft accelerate toward the ground the squall line bows forward. A bow echo is a radar signature strongly suggesting wind damage.

  30. Macrobursts

  31. Gustnadoes

  32. End of Part Two Click the “Back” button in your browser to exit the slide show.

More Related