Satellites, Weather and Climate Module 9: Air/sea interactions winter cyclogenesis
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1 Satellites, Weather and Climate Module 9: Air/sea interactions winter cyclogenesis
2 Winter storms things to consider Deep moisture Thermal discontinuity Favorable surface and upper level features Geographical features Climatology of event
3 Winter storm structure Warm frontal processes leads to widespread steady precipitation Cold front explains convective type precipitation Conveyor belt theory combines and expands upon these
4 Role of local and regional geographical features Upslope areas receive more precipitation with drying in downslope areas. Green Mtns as opposed to Champlain Valley Sheffield Heights as opposed to Connecticut Valley
5 Surface map Blizzard of 1899 Prior to the 1920 s we did not analyze for fronts. This concept was developed by Bjerknes in 1919 and evolved through the 1920 s.
6 Norwegian cyclone model 1920 s (Bjerknes) o Based on concept of air masses o Norwegian cyclone or Polar frontal theory provided large scale conceptual model of extratropical Cyclones o introduced role of frontal processes Stood the test of time, although over the years we have added details. Sources of lift Convergence Frontal Convection
7 Norwegian model ~ 1920 a Boundary between two air masses a front b Spin of earth along with wind shear results in cyclonic flow c & d System moves in direction of warm sector winds as wave develops Cold front eventually cuts off or over-runs warm front forcing warm air aloft - Occlusion
8 Norwegian cyclone family Conceptual model Not a continuous global band???cyclone families prevalent over ocean areas less so over land. WHY??? There are breaks or weak areas in the cloud bands Cyclones represent warm moist air moving poleward while anticyclones represent cold air moving south striving for thermal balance
9 Jan z
10 Air mass and moisture sources and favored storm tracks Class question Explain the reasons for Gulf of Mexico and Cape Hatteras area for storm development or cyclogenesis
11 Gulf Stream and Hatteras storms Gulf Stream provides low warmth and moisture (instability) for winter storm development Doubt the thermodynamic effect it s a favored area for nocturnal thunderstorms
12 Thunderstorms in predawn hours over the Gulf Stream with no surface weather features
13 Dec z Example of low level instability of Gulf Stream before cyclogenesis True frontal boundary lags to the west
14 Conveyor Belts
15 Adding to the Norwegian model Conveyor belts represent trajectories relative to the moving storm not air masses. Warm Conveyor Belt (WCB) moves warm moist air south to north Greatest ascent over the warm front before curving anticyclonically with upper level winds Cold Conveyor Belt originates in low levels along/north of warm front and moves westward before curving anticyclonically WCB major supply of moisture while CCB extends precipitation area westward forming comma head
16 Combined Norwegian and Conveyor Belt models Warm Conveyor Belt (WCB) Originates well south of storm near surface in warm air mass and flows north Rises over warm front and surface cold air before joining upper level westerly flow WCB responsible for much of storm s precipitation Cold Conveyor Belt (CCB) Originates along or north of warm front in cold relatively dry air Moves WESTWARD under WBC and becomes saturated as it rises CCB spreads precipitation and comma head cloud west before curving anticyclonically Dry slot or Dry Conveyor Belt (DCB) Originates in mid and high levels of cold air mass west of storm Sinks and curves in spiral fashion into storm Results in DRY slot with dissipating clouds between CCB and WCB
17 Storm Development
18 Linkage between winds aloft and winter storms Upper level flow linked to surface development through Divergence Convergence (Dines compensation) Mass continuity states: du/dx + dv/dy + dw/dz = 0 Or du/dx + dv/dy = - dw/dz
19 Real world example of Dines Compensation concept -Upper level directional divergence over Louisiana with low level convergence Speed Divergence Southeast Tx into La This enhances vertical motion and storm development with cloud system evolving into comma type cloud Note developing conveyor belt systems inferred from low level flow
20 Satellite signatures of developing cyclogenesis to mature storm Leaf cloud developing frontal wave Cyclogenesis storm system developing Mature storm Storm will soon begin to dissipate or move away
21 Can you relate this to general satellite signature of cyclogenesis??
22 Satellite signatures Mature winter storms about to shear off Blizzard 1979 December 20, 2008 Atlantic Ocean
23 Winter storm - Jan 2-3, Can you pick out the: WCB CCB DCB 2. Can you explain why so much snow fell in Champlain Valley???
24 Jan z -- Developing comma cloud -- Air mass contrast and conveyor belts -- Deep moist layer -- Warm advection noted above surface
25 Feb z/15z Identify cloud types and conveyor belts
26 Evolving coastal cyclogenesis 12z Jan 26, 2011
27 Jan storm system
28 Cyclogenesis 15z Jan 26, 2011 Do shadows help you pick out the CCB?? Can you pick out 2 or 3 circulation centers in the satellite imagery?
29 Jan 26, z Can you find the CCB on the west side of the WCB? Think about what is going on in the clear area off Virginia this is not the dry conveyor belt yet
30 What s going on in the clear area off the Virginia coast 18-19Z Jan 26, 2011
31 - Quiz time -
32 Ocean storm Jan 26-27, 2011 Surface map 1500Z 500mb chart 1200z Vis GOES 1645z
33
4/29/2011. Mid-latitude cyclones form along a
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