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Wind Channeling in the St. Lawrence River Valley: Synoptic Patterns, Local Conditions, and Operational Forecasts The Eleventh Northeast Regional Operational.

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Presentation on theme: "Wind Channeling in the St. Lawrence River Valley: Synoptic Patterns, Local Conditions, and Operational Forecasts The Eleventh Northeast Regional Operational."— Presentation transcript:

1 Wind Channeling in the St. Lawrence River Valley: Synoptic Patterns, Local Conditions, and Operational Forecasts The Eleventh Northeast Regional Operational Workshop 4-5 November 2009 Albany, New York Alissa Razy, Eyad Atallah, John Gyakum Department of Atmospheric & Oceanic Sciences McGill University

2 Data hourly surface data (winds) recorded at YUL North American Regional Reanalysis (NARR) dataset  developed by the National Centers for Environmental Prediction (NCEP)‏  32 km horizontal resolution  45 vertical layers  analyses performed every 3 hours

3 YUL: Observed Winds (DJF 1979-2002)‏

4 Observed Wind& Geostrophic Wind

5

6 1 histogram per 22.5 ° range of geostrophic winds

7 Pairing a Pairing b { {

8 Pairing a (northeasterly surface winds)‏ n = 210 Pairing b (southeasterly surface winds)‏ n = 207 Pairing b speed - Pairing a speed = 5.3 knots

9 Difference Fields: Pairing b (SE) - Pairing a (NE) MSLP (contours) & 1000-500mb thickness (shading)

10 Pairing a: NE sfc winds (red) & Pairing b: SE sfc winds (blue)‏ stability = 925 – 1000 Pairing b stab - Pairing a stab = -2.6 K

11 Pairing c Pairing d { {

12 Pairing c (northeasterly surface winds)‏ n = 52 Pairing d (southeasterly surface winds)‏ n = 192

13 Difference Fields: Pairing d (SE) - Pairing c (NE) MSLP (contours) & 1000-500mb thickness (shading)

14 Pairing c: NE sfc winds (red) & Pairing d: SE sfc winds (blue)‏ stability = 925 – 1000 Pairing d stab - Pairing c stab = -2.5 K

15 Summary south-southeasterly to south-southwesterly geostrophic winds northeasterly surface winds low/high couplet weaker gradients weaker upper-level pattern stronger stability  warm air advection southeasterly surface winds low/high couplet tighter gradients  more saturated stronger upper-level pattern  larger amplitudes  smaller wavelengths lower stability  less suppressed mixing

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