Joel Gratz @gratzo

Meteorologist and outdoorsy guy. Founder of powder forecasts @findopensnow and hiking forecasts @findopensummit opensnow.com Boulder, CO Joined October 2008

Tweets

4K
Followers

7K
Following

82
Likes

24

Joel Gratz @gratzo

2 years ago

@sutherlandjamie @OpenSnow @sutherlandjamie please email more information to hello@OpenSnow.com. Knowing the locations where the forecast was inaccurate will be helpful. We read and respond to every message. Thanks!

1 0 2 519 0

View Details

Joel Gratz @gratzo

2 years ago

@BianchiWeather @OpenSnow We are working on a probability approach. The hardest part is showing probability by default - it it's buried, most people won't go looking for it.

1 0 1 216 0

View Details

Joel Gratz @gratzo

2 years ago

@BianchiWeather @OpenSnow ...is that we do not just use the "6z GFS":-) We blend a LOT of model data. That doesn't mean that the forecast is perfect, but if a lot of models agree that 'something' will happen, it's worth paying attention to.

1 0 2 284 0

View Details

Joel Gratz @gratzo

2 years ago

@BianchiWeather @OpenSnow ...note that the purple color shows a chance of mixed precipitation (snow/rain) and since it will have been warm leading up to the storm, a lot of snow might melt. One more thing...

1 0 0 223 0

View Details

Joel Gratz @gratzo

3 years ago

@WFG_DEN Ha! Thanks for checking. I overslept (dreaming of snow) and then wrote as fast as I could.

1 0 3 303 0

View Details

Joel Gratz @gratzo

3 years ago

@ozskier @OpenSnow Seems odd. Will have to adjust the weather machine.

3 0 4 745 0

View Details

Joel Gratz @gratzo

5 years ago

@Katonts Last few storms were definitely light, or more snow farther west. Just non-ideal wind direction / storm track. First half of February brought bigger totals, so not all bad news:-)

2 0 0 0 0

View Details

Joel Gratz @gratzo

5 years ago

@MarkR_ATX @findOpenSnow A ballpark estimate is storms move 30mph, CA -> CO = ~900 miles, so roughly 1-2 days travel time. But, that's assuming the storm moves in a straight line west-to-east. Most storms don't. Chances for snow in CO increase after 10th, but no specifics yet. Thanks for your support!

0 0 0 0 0

View Details

Joel Gratz @gratzo

6 years ago

(2/2) For major fires like this #easttroublesomefire there are dedicated @NWS meteorologists that work with fire officials to give them the best weather information. My forecasts are just to provide perspective for those of us following on Twitter.

0 1 19 0 0

View Details

Joel Gratz @gratzo

6 years ago

(1/2) Wind on the east side of #easttroublesomefire near @RockyNPS will be strong through Saturday-day, then slowing Saturday-evening, and reversing with snow by Sunday morning. Best wishes to all involved as Saturday is going to be (and already is) a tough day.

1 1 21 0 0

View Details

Joel Gratz @gratzo

6 years ago

Weather update for #EastTroublesomeFire near Estes Park: Winds blow from the east Thu aftrn through Thu night (this is good). Then winds switch back to blow from west, strongly, from Fri aftrn to Sat aftrn (this is bad). Fri night - Sat aftrn is concerning. Then snow Sat night!

0 1 31 0 0

View Details

Joel Gratz @gratzo

6 years ago

@skifanski OMG, that picture. This fire. Ugh. Can I post the pic in the Colorado Daily Snow on Thu?

1 0 0 0 0

View Details

Joel Gratz @gratzo

6 years ago

Weather forecast... Thu winds still gusty. Thu evening winds slow, change direction, temps cool, moisture increases through Fri. Then Sat winds will be strong with low moisture. Sat night & Sun = cold & snow likely. 🤞#EastTroublesomeFire

1 3 28 0 0

View Details

Joel Gratz @gratzo

6 years ago

@nplareau Thanks Neil, this is super helpful!

1 0 1 0 0

View Details

Joel Gratz @gratzo

6 years ago

Weather update for #CalWoodFire and #LefthandCanyonFire: Thu ~6am winds shift to blow from east, Thu ~4pm winds get stronger from the east. Maybe light snow on Thu night. Solid chance for snow Sat night into Sunday.

0 3 8 0 0

View Details

Joel Gratz @gratzo

6 years ago

Wind update: Tue AM: Gusty from W. Tue PM: Slow speeds, from E. Wed: Increasing speeds, from W. Thu: Slowing speeds, from E. Snow update: Thu night: light snow possible, colder. Sun: Possibly significant snow, very cold. This is mostly good news. #CalWoodFire #lefthandcanyonfire