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DIAMET DIAbatic influences on Mesoscale structures in Extratropical sTorms Geraint Vaughan, Manchester PI John Methven, Reading PI Ian Renfrew, East Anglia.

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Presentation on theme: "DIAMET DIAbatic influences on Mesoscale structures in Extratropical sTorms Geraint Vaughan, Manchester PI John Methven, Reading PI Ian Renfrew, East Anglia."— Presentation transcript:

1 DIAMET DIAbatic influences on Mesoscale structures in Extratropical sTorms Geraint Vaughan, Manchester PI John Methven, Reading PI Ian Renfrew, East Anglia PI Doug Parker, Leeds PI

2 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

3 People working on cases IOP10 –DEMON – David Mason and Javier Garcia-Pintado - Paul Bates and co –Patrick Bunn with Peter –Oscar simulating with water tracers in MetUM IOP13 –Aoife Hsu with Sue and John –Gary Lloyd with Tom C.? IOP14 –Gary Lloyd with Tom C.

4 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

5 Last week Sunday 29/4/2012 Similar to 2007 Cyclone develops under a stationary trough and moist airmass ascends in from East.

6

7 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

8 (end of dropsonde leg to North)

9 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

10 IOP14: 15 Aug 2012 Meteosat IR 12UT 14UT

11 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

12 (end of dropsonde leg to North)

13 Met Office NAE run T+3 at 09UT Large-scale rain rate +MSLP Convective rain rate

14 Met Office NAE run T+3 at 09UT PV (300hPa) Liquid water content 750 hPa

15

16 Dropsonde sections versus UM u v - obs w - model

17 Dropsonde sections versus UM Theta-e / theta-w Cloud liquid (colours) Cloud ice (contours)

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19

20

21 DIAMET flight summary DateIOPEvent 16 Sept1Upper PV anomaly forcing rainband 20 Sept2Frontal waves (weak) on cold front 23 Sept3Frontal wave (strong) – diabatic Rossby wave mechanism? 26 Nov4Surface fluxes 28 Nov5aDouble cold front in Atlantic 29 Nov5bCold front (intense) – split into segments + tornados 1 Dec6Intense cyclone - bent back warm front + surface fluxes 5 Dec7Shallow convection in cold airstream (non-polar low case) 8 Dec8Sting jet cyclone 12 Dec9Warm front (intense) 30 Apr-1 May10Slow moving cyclone and flood event capture (W. England) 9-10 May11a,bFrontal wave (development) 10 July12Upper PV anomaly developing circulation below 18 July13Slow-moving summer cyclone (bent-back warm front) 15 Aug14Slow-moving summer cyclone (bent-back warm front)

22 IOP14: 15 Aug 2012 Meteosat IR 12UT 14UT

23 Specific humidity 400 hPa Theta-e 750 hPa

24 Flight track over N. Ireland


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