Tuesday, August 9, 2011

Weekend Forecast Analysis for Aug. 6-7 - No Clear Winners

We did another extended weekend forecast analysis for this past weekend's weather (Aug. 6-7) as predicted on the night of Sunday, July 31. There were no clear winners for the forecast and what seems most noteworthy is that none of the weather outlets latched on to the 6-degree decrease in temps that occurred from Saturday to Sunday.

The forecasts:(Sat/Sun)
KARE: mid 80s nice/low 80s chance of t-storm
KSTP: 86/86, 30% each day
FOX: 86/86, chance t-storm Saturday night
WCCO: 86/85 (chance t-storm on Sunday)
NWS: 84/86, slight chance of t-storm each day
Accuweather: 84 nice/85 t-storm possible
Weather.com: 83 partly cloudy/81 scatter t-storms
Intellicast: 82 partly cloudy/80 (scattered t-storm)
Strib: 85/84 scattered pm storms each day

What actually happened:
Saturday: Partly cloudy, high 88, t-storms
Sunday: Partly cloudy, high 82

Is Summer Over?

Minnesota heat lovers have reason to think that the good stuff is over. Thoughts?
Photo taken in the evening of Aug. 9.

Tuesday, August 2, 2011

Followers Beware: Tweets on Seemingly Inevitable Storms Often Wrong

This morning provided another reminder that, in our eyes at least, tweeting meteorologists are putting too much predictive emphasis on emerging radar echoes and, in their efforts to be precise, forgetting that storms die out, rebuild and change directions. At a minimum, they'd be wise to at least use more cautionary wording like "may" or "if it holds together" when discussing the movement of storms seemingly headed for the metro.

This morning, Sven Sundgaard detailed with seeming certainty the arrival of morning storms per the graphic below. With our hopelessly untrained eye, we looked at the radar shortly after 7 and wondered if that would actually happen. For one, the storms were a relatively long way away (though moving very quickly) and it seemed puzzling that one could speak with such certainty given the distance the storms still had to travel. For the fun of it, we tweeted close to 8 a.m. that we had our doubts. But it wasn't until close to 9 a.m. that Sven acknowledged that the storms indeed were going to miss the most of the metro.


Tweet issued at 7:07 a.m.



Amateur tweet at 7:59 a.m.
Tweet issued at 8:44 a..m.

Conversely, we did note that Jonathan Yuhas, whose tweets were off the mark during the day and evening of the U2 concert employed wording that acknowledged merely the possibility of storms arriving in the metro.


 It's baffling to us why many forecasters continue to make pronouncements of impending storms in such certain terms, particularly when storms are still a decent distance away. Why not use tweets to put us on alert and then communicate with more certainty when storms are truly on the doorstep. Doesn't that make more sense?

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Monday, August 1, 2011

The First of August Brings a Summer Bust

By this time, everyone knows that this was one of the bigger weather busts in a while. And, it was unanimous, so there's no point in comparing the performance of individual forecasters. No weather outlet suggested anything close to what happened today -- both in terms of forecast temperatures and the timing and coverage of the storms. It even seemed that the morning nowcasts somewhat missed the boat. When it became apparent that storms loomed with greater significance than expected, several forecasters anticipated a mid-morning arrival of the storms, when in fact it seemed they held back a bit to produce a stronger punch shortly after noon.

No mention of today's forecast evaluation could go without noting the irony of the coolest day in the last week being the one where an official heat advisory was issued. For that matter, it seems the NWS really should have issued a heat advisory for yesterday, when heat indexes were truly oppressive.

Any professional mets out there have any thoughts on what happened from an informed, meteorological perspective? Did the warm front take longer to come through? What materialized that wasn't anticipated by the beloved models?