Date/Time (UTC)

Anomaly of geopotential height at 500 hpa level (m)

Over north America

Over west of Atlantic Ocean

09/0000

−200

200

09/0600

−225

225

09/1200

−175

225

09/1800

−125

250

10/0000

−150

250

10/0600

−150

200

10/1200

−150

200

10/1800

−100

150

11/0000

−100

200

11/0600

−150

150

11/1200

−200

100

11/1800

200

150

12/0000

200

−300

12/0600

200

−300

12/1200

200

−300

12/1800

250

−300

13/0000

200

−200

13/0600

225

−225

13/1200

250

−200

13/1800

225

−225

14/0000

200

−200

14/0600

200

−175

14/1200

200

−175

14/1800

175

−175

15/0000

200

−150

15/0600

175

−150

15/1200

200

−150

15/1800

175

−100

16/0000

175

−100

16/0600

−100

−100

16/1200

−100

−100

16/1800

−125

−200

17/0000

−150

−200

17/0600

−100

−200

17/1200

−150

−200

17/1800

−175

−175