Green Events. Aug 3. 2006 DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug. 315 m/s35 deg.770 km Additional Comments: AEJ.

Slides:



Advertisements
Similar presentations
Creating AEW diagnostics. As seen in case studies and composites, AEWs are characterized by a ‘wavelike’ perturbation to the mid-tropospheric wind field.
Advertisements

The Structural Evolution of African Easterly Waves Matthew A. Janiga and Chris Thorncroft DEPARTMENT OF ATMOSPHERIC AND ENVIRONMENTAL SCIENCES University.
February 19, 2004 Texas Dryline/Dust Storm Event.
Global and Local Winds Chapter 16 Section 3.
TropicalM. D. Eastin Tropical Waves Composite of TRMM Rainfall and Ocean Surface Wind Anomalies April Eastward propagating Kelvin waves From.
500 km. Adapted from Fink and Reiner (2003) Squall Line Generation 12.5°-20°N 5°-12.5°N Mid-level Vortex What do we know about the AEW-MCS Relationship?
Prof. Paul Sirvatka ESAS 1115 Severe and Unusual Weather Severe and Unusual Weather ESAS 1115 Severe and Unusual Weather ESAS 1115 Spotter Training and.
Genesis of Hurricane Julia (2010) from an African Easterly Wave Stefan Cecelski 1 and Dr. Da-Lin Zhang Department of Atmospheric and Oceanic Science, University.
Orographic Storms in the Southern Europe Heavy precipitating storms resulting from proximity to Mediterranean Sea Fall season particularly dangerous because.
Seeder-Feeder Mechanism When topography is too shallow to force a pure orographic cloud, a seeder-feeder mechanism may operate: –Ice crystals produced.
Chap. 5 Conceptual models of synoptic Tropical disturbances in summer Definition of tropical disturbances : A discrete tropical weather system of apparently.
Midlatitude Cyclones Equator-to-pole temperature gradient tilts pressure surfaces and produces westerly jets in midlatitudes Waves in the jet induce divergence.
Chapter 10 Mid-latitude Cyclones Chapter 10 Mid-latitude Cyclones.
2007 AEW activity in Global models. - Following Berry, Thorncroft and Hewson (2007; henceforth BTH07) we use 700hPa wind to compute curvature, shear vorticity.
Precipitation Over Continental Africa and the East Atlantic: Connections with Synoptic Disturbances Matthew A. Janiga November 8, 2011.
The Structure of AEWs in the CFSR and their Relationship with Convection.
EASTERLY WAVE STRUCTURAL EVOLUTION OVER WEST AFRICA AND THE EAST ATLANTIC Matthew A. Janiga Department of Atmospheric and Environmental Sciences, University.
ATM 521 Tropical Meteorology SPRING ATM 521 Tropical Meteorology SPRING 2015 CLASS# 9825 Instructor:Chris ThorncroftTime: TUES/THURS 11:45-1:05.
4.6 Hot Topics Genesis Scale Interactions Relationship to Tropical Cyclogenesis.
Section 4: Synoptic Easterly Waves. 4.1 Introduction 4.2 The Mean State over West Africa 4.3 Observations of African Easterly Waves 4.4 Theory 4.5 Modeling.
ATM 521 Tropical Meteorology FALL ATM 521 Tropical Meteorology SPRING 2008 Instructor:Chris Thorncroft Room:ES226 Phone:
Aug. 4-6 th Dust Event. 1/12 2/00 2/12 3/00 3/12 4/00 Dust DarfurHighlands.
The impact of African easterly waves on the environment and characteristics of convection over West Africa Matthew A. Janiga and Chris D. Thorncroft University.
Upper-level Mesoscale Disturbances on the Periphery of Closed Anticyclones Thomas J. Galarneau, Jr. and Lance F. Bosart University at Albany, State University.
Observed characteristics of the mean Sahel rainy season This talk (1) The basic state (some conclusions from the JET2000 field campaign) (2) Mesoscale.
African Easterly Waves Figure from Chris Landsea.
A Taste of the Tropics Easterly waves Tropical Cyclones
An introduction to the Inter-tropical Convergence Zone (ITCZ) Chia-chi Wang Dept. Atmospheric Sciences Chinese Culture University Acknowledgment: Prof.
Island Effects on Mei-Yu Jet/Front Systems and Rainfall Distribution during TIMREX IOP#3 Yi-Leng Chen and Chuan-Chi Tu Department of Meteorology SOEST,
The impact of African easterly waves on the environment and characteristics of convection over West Africa Matthew A. Janiga and Chris D. Thorncroft NE.
Template provided by: “posters4research.com” The environment and characteristics of convective events over Niamey, Niger: AMMA SOP2 observations and climatological.
Identifying systems that can lead to extreme weather events in the Caribbean.
Hurricane Juan (2003): A Diagnostic and Compositing Study Ron McTaggart-Cowan 1, Eyad Atallah 2, John Gyakum 2, and Lance Bosart 1 1 University of Albany,
Tropical Cyclogenesis Associated with African Easterly Waves THIS TALK 1.Multi-Scale Structure of African Easterly Waves 2.Importance of Guinea Highlands.
ATM 421 Tropical Meteorology SPRING ATM 421 Tropical Meteorology SPRING 2011 CLASS# 9112 Instructor:Chris ThorncroftTA: Kyle Griffin Room:ES226ES218.
African Easterly Waves during 2006 – Objective diagnostics and Overview. Gareth Berry and Chris Thorncroft. University at Albany/SUNY 10/09/ UTC.
ATM 521 Tropical Meteorology FALL ATM 521 Tropical Meteorology SPRING 2008 Instructor:Chris Thorncroft Room:ES226 Phone:
Convectively Coupled Kelvin Waves Multi-Scale Study Over Africa in 2011 Matthew Janiga.
ATM 521 Tropical Meteorology FALL ATM 521 Tropical Meteorology FALL 2011 CLASS# 9070 Instructor:Chris ThorncroftTime: MON/WED 12:35-1:55 Room:ES.
A Case Study of an Outbreak of Twin Tropical Cyclones Carl J. Schreck, III Department of Earth and Atmospheric Sciences University at Albany, SUNY.
Tropical Meteorology I Weather Center Event #4 Tropical Meteorology What is Tropical Meteorology? – The study of cyclones that occur in the tropics.
Objectives:  Types of blocking ridges  Storms that typically accompany the block.  Numerical models and ensembles forecast these ridges as much as 10.
A Climatology of Central American Gyres Philippe P. Papin, Kyle S. Griffin, Lance F. Bosart, Ryan D. Torn Department of Atmospheric and Environmental Sciences:
Large-scale surface wind extremes in the Mediterranean Shira Raveh-Rubin and Heini Wernli Institute for Atmospheric and Climate Science (IACETH), ETH Zurich.
Kinematic Structure of the WAFR Monsoon ATS mb NCEP Climatology Zonal Winds.
 Prevailing winds are major wind patterns that cover large geographical areas  In Ontario the prevailing wind direction is from the West  Prevailing.
Dynamic tropopause analysis; What is the dynamic tropopause?
Global Winds. Air Movement Wind is the movement of air caused by differences in air pressure Wind is the movement of air caused by differences in air.
Positive Potential Vorticity Anomalies Generated from Monsoon Convection Stephen M. Saleeby and William R. Cotton Department of Atmospheric Science, Colorado.
Global Winds. Air Movement Wind is the movement of air caused by differences in air pressure Wind ALWAYS moves from areas of high air pressure to areas.
Adiabatic Westward Drift in Monsoon Depressions Introduction and Methods Boos et al
A Subtropical Cyclonic Gyre of Midlatitude Origin John Molinari and David Vollaro.
Period: September-November; 1 degree fields Collaborators: Joe Terry, Juan Carlos Jusem Hurricanes in T511 Nature run Oreste Reale.
500 km. Adapted from Fink and Reiner (2003) Squall Line Generation 12.5°-20°N 5°-12.5°N Mid-level Vortex What do we know about the AEW-MCS Relationship?
An Investigation of Model-Simulated Band Placement and Evolution in the 25 December 2002 Northeast U.S. Banded Snowstorm David Novak NOAA/ NWS Eastern.
10/25/ th Cyclone Workshop1 Analysis of the potential vorticity budget of a tropopause polar cyclone Steven M. Cavallo and Gregory J. Hakim University.
Juliane Schwendike and Sarah Jones The Interaction between Convection and African Easterly Waves:
Fuzzy Cluster Analysis Investigating Wavebreaking in the Tropics Philippe P. Papin Team Torn Meeting – April 15, 2015 Department of Atmospheric and Environmental.
Formation of a hurricane in a sheared environment John Molinari, David Vollaro, and Kristen L. Corbosiero Note: these figures should be examined along.
Global and Local Winds.
551 Tropical Advanced Topics.
SO254 Extratropical cyclones
Impact of North Atlantic hurricanes on episodes of intense rainfall over the Mediterranean Florian Pantillon1,2 Jean-Pierre Chaboureau1 and Evelyne.
Blocking Patterns Objectives: Types of blocking ridges
The African Monsoon Region and the Tropical Atlantic
551 Tropical Advanced Topics.
4.6 Hot Topics Genesis Scale Interactions
Middle-Latitude Cyclones - I
 THIS TALK Introduction into the WAM
The formation of surface circulation systems
Presentation transcript:

Green Events

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug. 315 m/s35 deg.770 km Additional Comments: AEJ with 25 m/s jet core at 700 hPa extending from 0-23W. MCS and ITF cyclone appear to develop in phase. Low-level theta e advection on S side of ITF cyclone appears to help MCS.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

925 θe (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug. 610 m/s31 deg.530 km Additional Comments: Begins at entrance of AEJ, 700 hPa easterlies are broken and perturbed by convection in AMMA reanalysis. Develops on the eastern edge of a southerly surge. Low-level flow is weak with theta e values that aren’t particularly high. A weak vortex along the ITF was moving into this moist environment. Its weakness may be related to the lack of any AEW.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

925 θe (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug m/s21 deg.1040 km Additional Comments: Some very intense convection developed along the Niger / Nigeria border at 8/ Z. This initiation occurred in the NW sector of an AEW trough. Large increase in 700 hPa jet on eastern side of the convective system from almost nothing to a large core of 20 m/s. A strong ITF cyclone well to the NW over NW Mali was advecting large amounts of high theta e from the west. This convective event was the developing stage of a very intense and very large AEW which developed over the next two days. Part of the previously mentioned strong westerly flow appears to be tied to a Kelvin wave of moderate intensity which was propagating over the region at this time. Trough digging in over West Africa in the days prior (tied to Kelvin wave and or ITF cyclone?). This is a really interesting event!

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug m/s27 deg.1010 km Additional Comments: Although the AEJ was fairly zonal and strong the low-level flow was fairly chaotic a number of vortices along the ITF.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug m/s32deg.1430 km Additional Comments: Develops in NW sector of trough in an environment with an intense (20-30 m/s) AEJ which extended from the Ethiopian Highlands all the way to the East Atlantic. Possibly some Kelvin wave activity. This convective system helped to build an AEW of moderate intensity with clear sinusoidal perturbation of the PV strip.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Aug DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Aug m/s11 deg.660 km Additional Comments: Appears to be a continuation of the previous event.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Sep DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Sep. 518 m/s18 deg.1250 km Additional Comments: Convection began behind an AEW and followed a strong surge of cool air into the SHL. Strong easterly flow > 25 m/s.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Sep DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Sep m/s31 deg.1330 km Additional Comments: Occurred in a fairly intense AEJ couplet on the N side of the upstream trough possibly aided by the ridge built behind the Helene AEW. Looks like a recharge of the low-level theta e following the Helene AEW at low-levels. Moving into the post-monsoon-surge environment following Helene AEW.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Sep DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Sep m/s6 deg.560 km Additional Comments: Very cold cloud tops (< -80C) occurred in the NW sector of a developing AEW (just slightly titled PV strip). Occurs within a fairly intense AEJ m/s. As seems to be typical of these regions the low-level winds are fairly weak.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)

Sep DatePropagation Speed Lightning Stripe Length (degrees) Squall line length Sep m/s26 deg.1250 km Additional Comments: Line of convection with SE-NW orientation began just south of the ITF and moved toward SW. Convection formed within 20 m/s AEJ jet core east of an AEW.

925 Vorticity (2x10 -5 s -1, red contours) and 700 Streamfunction (x10 6 m 2 s -1, black contours)

700 PV (0.1 PVU, shaded) and Streamfunction (x10 6 m 2 s -1, black contours)

925 θv (K, shaded), Vorticity (>2.5x10 -5 s -1, red contours), and Streamfunction (x10 6 m 2 s -1, black contours)

700 Streamfunction (x10 6 m 2 s -1, black contours) and Windspeed (ms -1, shaded)