Development of the current pattern is on course with expectations, featuring additional moisture interrelated to the remnants of Cindy through the east and some swelling of the major western US heat into SW BC.
Between the two much cooler air has sunk into central regions and active weather continues to be on the move.
NL experienced significant rain yesterday on the heels of previous noteworthy totals in both ON and QC.
NEWFOUNDLAND AND LABRADOR
Weather summary for Newfoundland issued by Environment Canada at 5:52 a.m. NDT Sunday 25 June 2017. Discussion. A warm frontal system tracked from west to east across Newfoundland on Saturday, bringing rain to the entire Island. Rainfall amounts were highest over southern areas where deep moisture contributed to intense rates, at times in excess of 15 millimetres per hour. The rain tapered off Saturday night as the frontal boundary moved away to the east. The following is a summary of weather event information received by Environment and Climate Change Canada as of 5:30 A.M. NDT. 1. Summary of rainfall in millimetres: Port aux Basques (Grand Bay East): 94.0 Burgeo: 70.3 Stephenville Airport: 52.0 Wreckhouse: 53.1 St. Andrew's (Codroy Valley): 47.0 Chapel Arm: 39.1 St. Lawrence: 37.0 Burin: 33.3 Deer Park: 32.8 St. John's East: 32.4 Marystown: 29.4 Paradise: 29.0 Goulds: 27.6 Ochre Pit Cove: 27.2 Cormack: 26.2 St. John's West: 26.0 St. John's Int'l Airport: 25.4 Deer Lake Airport: 25.0 Saint-Pierre Airport: 24.1 St. Philip's: 24.0 Ferrolle Point: 21.8 Port au Choix: 21.4 Corner Brook: 19.7 Please note that this summary may contain preliminary or unofficial information and does not constitute a complete or final report. End/NLWO
On the west coast a shot of very warm air associated with a bulging upper ridge has set some new high temp records.
A SWS regarding the hot spell remains in place for today before a modest cooldown takes hold over the next while.
Weather summary for British Columbia issued by Environment Canada at 11:25 p.m. PDT Saturday 24 June 2017. Discussion. A strong upper ridge of high pressure that built over southern British Columbia on Saturday marked the start of a brief heat wave. Several Daily Temperature Records were broken. Summary of Daily Temperature Records in degrees Celsius. Abbotsford Area 32.4 (previous record 31.4 in 1982) Chilliwack Area 34.8 (previous record 33.9 in 1926) Hope Area 31.8 (previous record 31.4 in 1982) Lytton Area 36.5 (previous record 36.1 in 1926) Squamish Area 31.1 (previous record 30.4 in 1982) Sechelt Area 30.2 (previous record 25.5 in 1982) Powell River Area 30.0 (previous record 29.4 in 1926) Please note that this summary may contain preliminary or unofficial information and does not constitute a complete or final report. End/PSPC
A discharge of chilly air into the core of the continent is leading to substantial temp departures, notably in MB where Brandon topped out at 14.6c yesterday and Winnipeg only managed to achieve 12.6c – both average near 24 as a high this time of year. They’re also quite cold as I’m writing this at 2 and 3.5c respectively, versus normal lows between 10 and 12.
Here’s the graphical 1-day temp anomalies from the 23rd to the 24th:
There looks to be a relaxation towards a more flat, zonal flow through the medium range which should assist in easing the ongoing temperature disparity. This motif has been advertised by the Euro weeklies to varying degrees over the past while so it seems reasonable as we head into July. New data from the weeklies is available every Monday and Thursday evening FYI.
Although the amplitude and thus extremes may be reduced there should still be a fair amount of variability and activity moving forward as contrasting airmasses joust with one another and no shortage of varied disturbances swing through.
00z EPS 500mb height anomalies, days 1-5:
850mb temps, same timeframe:
500mb height anomalies, days 6-10:
850mb temps, same timeframe:
The GL region continues to be advertised as seeing above-normal precip on the whole through the course of the medium range, extending eastward to a somewhat lesser extent.
00z GEFS precip anomalies, days 1-10:
This is the probabilistic temperature profile from EC farther out into the extended.
Try to keep in mind the difference between deterministic and probabilistic guidance when viewing these images.
00z NAEFS temp probabilities, days 8-14: