Numerous incidents of large, damaging hail and a possible EF0 tornado occurred in AB yesterday. This is EC’s current summary.
Weather summary for Alberta issued by Environment Canada at 9:54 a.m. MDT Monday 10 July 2017. Discussion. On the evening of July 9, 2017 a series of thunderstorms developed over the Alberta foothills. They tracked eastward throughout the evening and into the overnight period before they weakened and crossed the Saskatchewan border. The following is a summary of weather event information received by Environment Canada. All times are in MDT. Probable Tornado East of Sunchild at 17:01. No damage has been reported with this tornado, therefore it has been given a preliminary rating of EF0. PASPC meteorologists are actively seeking pictures of the tornado or damage it may have caused. Should you have any information regarding this event, or to report severe weather at any time, please call 1-800-239-0484, send an email to ec.storm.ec(at)canada.ca, or tweet to (hash)abstorm. Hail (hail sizes listed are approximate) Ping Pong size hail (~4 centimetres) East of Ocheise at 17:10. Tennis ball size hail (~6 centimetres) in Drayton Valley at 17:30. Walnut size hail (~3.5 centimetres) in Whitecourt at 18:00. Golf Ball size hail (~4.5 centimetres) in Entwistle at 18:40. Ping Pong size hail (~4 centimetres) in Rocky Mountain House at 18:45. Toonie size hail (~2.9 centimetres) in Whitecourt at 18:50. Golf Ball size hail (~4.5 centimetres) in Caroline at 19:45. Tennis Ball size hail (~6 centimetres) North of Leslieville at 19:50. Golf Ball size hail (~4.5 centimetres) in Innisfail at 20:10. 5 centimetre hail North of Olds at 20:20. Wind 72 kilometre per hour wind gust in Grande Prairie at 19:19. 93 kilometres per hour in Fairview at 19:50. 85 kilometre per hour wind gust in Brownvale at 20:20. 129 kilometre per hour wind gust in Campsie at 20:56. 87 kilometre per hour wind gust in Peace River at 21:00. 91 kilometre per hour wind gust in Bellshill at 22:56. Please note that this summary may contain preliminary or unofficial information and does not constitute a complete or final report. End/PASPC
Severe thunderstorm watches are in place again today with a significant threat zone outlined through parts of SK.
Graphical outlook & discussion from the Prairie and Arctic Storm Prediction Centre:
SYNOPTIC OVERVIEW…HIGH-AMPLITUDE OMEGA BLOCK NOW BEGINNING TO FLATTEN OUT SLIGHTLY AS NEW IMPUSLE DIGS INTO THE RIDGE OVER WASHINGTON STATE. DEEP STACKED LOWS STILL ROTATING OVER THE EASTERN PACIFIC AND HUDSON BAY. UPPER-LEVEL RIDGING EXTENDS NORTHEASTWARDS FROM AN UPPER HIGH OVER UTAH THROUGH THE CENTRAL CANADIAN PRAIRIES, INTO THE NORTHWEST TERRITORIES, AND THEN ARCING BACK NORTHWESTWARDS TOWARDS GREAT BEAR LAKE.
EASTERN PRAIRIES…HEAT WARNING OVER SOUTHWESTERN SASKATCHEWAN REMAINS IN PLACE WITH HIGH TEMPERATURES TODAY IN THE LOW- TO MID-THIRTIES. A COLD FRONT PASSING THROUGH LATER TODAY WILL BRING COOLER TEMPERATURES TO THE REGION TONIGHT INTO TOMORROW. LONG-RANGE FORECASTS ALL BUT CERTAIN HEAT WILL RETURN IN THE LATTER HALF OF THE WEEK AND PERSIST THROUGH THE WEEKEND.
MEDICINE HAT LOW PRESSURE SYSTEM TRACKS EASTWARDS TODAY AND WILL BE FOCUS FOR THUNDERSTORM DEVELOPMENT. QUITE WARM SOUTH TO SOUTHEASTERLIES WITH TDS IN THE MID- TO HIGH-TEENS WILL MEET HOT AND DRY SOUTHWESTERLIES WITH TDS IN THE SINGLE DIGITS. WARM FRONT DRAPED ALONG SASKATCHEWAN’S PORTION OF THE YELLOWHEAD HIGHWAY LIKELY TO BE THE FOCUS FOR SEVERE THUNDERSTORM DEVELOPMENT LATE THIS AFTERNOON AND EVENING. 20-30 KNOT EASTERLIES AT THE 925 MB LEVEL VEER AROUND TO WEST-SOUTHWEST 35 KNOTS AT 500 MB. MLCAPE EXPECTED TO BE NEAR 1500 J/ KG.
THUNDERSTORMS ALSO POSSIBLE FARTHER SOUTH AND WEST, WITH MUCH OF THE PROVINCE SEEING A CHANCE OF LIGHTNING TODAY. SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE AS WELL.
IN THE MOST SEVERE THUNDERSTORMS, HAZARDS EXPECTED ARE 3-6 CM HAIL, WIND GUSTS POSSIBLY REACHING 110 KM/H, AND CHANCE OF A TORNADO. IN THE GENERAL AREA WHERE SEVERE THUNDERSTORMS ARE POSSIBLE, THE PRIMARY THREATS ARE 2-4 CM HAIL AND WIND GUSTS POSSIBLY EXCEEDING 90 KM/H.
THESE THUNDERSTORMS ARE EXPECTED TO MOVE INTO MANITOBA TONIGHT, WEAKENING AND CONTINUING EAST-SOUTHEASTWARDS. ACTIVITY SHOULD REACH WINNIPEG IN THE EARLY MORNING AND CONTINUE EASTWARDS THROUGH THE MORNING INTO ONTARIO.
ADDITIONALLY, RAINFALL OF 25-40 MM MAY MATERIALIZE OVER THE NEXT 24-36 HOURS ALONG THE NORTHERN GRAINBELT OF SASKATCHEWAN AS MOISTURE IS SHEARED OUT ALONG A SHARP DEFORMATION ZONE.
ALBERTA…AFTER YESTERDAY’S SEVERE WEATHER, IT’LL BE RELATIVELY QUIETER ACROSS THE PROVINCE, ALTHOUGH THE SEVERE WEATHER WON’T COMPLETELY CLEAR THE PROVINCE. POST-FRONTAL UPSLOPE MOIST FLOW WILL INTERACT WITH MODERATE SHEAR IN THE SOUTHERN 1/5 OF THE PROVINCE, GIVING A THREAT FOR SUPERCELLS WITH LARGE HAIL AND DAMAGING WINDS.
BY LATE WEEK AND NEXT WEEKEND, THE HEAT WILL ONCE AGAIN RETURN TO THE WESTERN PRAIRIES, WITH SOME RECORDS, EVEN IN THE UPPER THIRTIES, LIKELY TO BE THREATENED.
Here’s a look at 30-day rolling precip values to emphasize the famine and feast nature that the pattern has produced across the country, courtesy of Agriculture & Agri-Food Canada.