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Dave Zaff

@davidzaff.bsky.social
398 followers 421 following 176 posts

Meteorologist. I like snow, all kinds. Except blizzards. I don’t like blizzards.

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Reposted by Dave Zaff
RadarScope @radarscope.app · 21/09/2026
RadarScope 5.7 is available today for iOS with support for ProbSevere, RRFS, indie radars, and One more thing…
RadarScope on CarPlay.
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Dr. Wendy Bohon @drwendyrocks.bsky.social · 26/08/2026
Some early reports said that the horrifying flooding in Nepal was the result of an earthquake. However, the signal was actually the recording of the landslide. TL:DR - there was no earthquake, it was a landslide. earthquake.usgs.gov/earthquakes/...
Screen shot showing the USGS event page. The landslide released the same amount of energy as a M5.2 earthquake
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Dr. Wendy Bohon @drwendyrocks.bsky.social · 25/06/2026
Ok you guys. Here’s the deal. The M7.1 in Venezuela was upgraded to a M7.2. AND it was followed shortly by a M7.5. Not good.
Location of the M7.2 and M7.5 in Venezuela
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Doppler on Wheels (DOW) @dowfacility.bsky.social · 24/04/2026
MiniCOW packs MegaPOWER! Observes birth and ingestion of satellite tornado and Fujiwara effect deflecting tornado. Tornado transitions 2x between clear eye and debris ball. Prelim data from most powerful mobile radar, 1 MegaWatt C-band storm-penetrating miniCOW in Braman, OK 🌪️
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Dave Zaff @davidzaff.bsky.social · 03/04/2026
There are a lot of posts about Artemis II and a picture of Earth today. Most show the bright one (right). But I *think* that was enhanced, as another less interesting, but probably more realistic one is also available via NASA (left).
Two images of Earth, via NASA (Artemis II).  The one on the left shows a dim view of Earth with a clear bright arc on side indicating that the planet will soon be illuminated by the sun.  The one on the right, presumably the same image, appears to be brightened to show more details.
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cira-csu.bsky.social @cira-csu.bsky.social · 02/04/2026
From its angled view, GOES-18 also captured the historic launch of Artemis II.
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Dave Zaff @davidzaff.bsky.social · 01/04/2026
There it GOES! #Artemis II view via #GOES 19
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Pat Hyland @hylandwx.bsky.social · 21/03/2026
Three consecutive days of record-breaking global high temperature records for a single day (counts dating back to July 2010 - coolwx.com/record)
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Greg Porter @gporterwx.bsky.social · 23/02/2026
Wow! Officially the biggest snowstorm in RI history. Providence will make a run at 40 inches
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daryl herzmann @akrherz.bsky.social · 13/01/2026
🚨 🚀 A crude interface I built to expose an archive of College of DuPage GOES imagery since about 15 Apr 2017. The archive is around ~500TB in size over ~2.5 billion JPEG images. Yikes, but here you go. mesonet.agron.iastate.edu/archive/cods... Anyways happy for feedback. Not worth the effort?
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Dave Zaff @davidzaff.bsky.social · 01/01/2026
Snow bands are feeding into an arctic front as it moves ESE through PA. Many snow squall warnings accompany the front with localized intense snow and whiteout conditions. Impressive winter radar display.
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Dave Zaff @davidzaff.bsky.social · 29/12/2025
I don’t post KBUF radar much anymore, but Go Bills!
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Marshall Shepherd @drshepherd2013.bsky.social · 18/12/2025
What's NCAR? and 8 ways it has helped you www.forbes.com/sites/marsha...
forbes.com
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Colette Delawalla, PhD @cdelawalla.bsky.social · 17/12/2025
Hi. Hello. Shutting down climate research doesn't make climate change stop existing!
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Dave Zaff @davidzaff.bsky.social · 19/11/2025
Hard to choose, but the 7:27 minute Go Set is “Snap-crackle-pop-boom, POW” good. But the 14:12 minute Thomas Duncan, Pt 3 is a masterpiece. “Perhaps you did not get the memo?”Then there’s Samba for Sam… Oh never mind. They’re ALL good. “Don't let the music stop”
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Nahel Belgherze @wxnb.bsky.social · 01/11/2025
NOAA aerial imagery is coming in. Hurricane Melissa literally turned western Jamaica from green to brown. Vegetation damage is immense — recovery will take years.
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Tomer Burg @burgwx.bsky.social · 29/10/2025
Zoomed-in, 1-minute loop leading up to Melissa's record-tying destructive landfall - notice the Air Force plane circling in the eye after experiencing severe turbulence before leaving the storm:
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Dakota Smith @weatherdak.bsky.social · 29/10/2025
Alrighty, ready to see something really cool? (and maybe a little nauseating) The evolution of Hurricane Melissa's mesovortices at peak strength.
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Dave Zaff @davidzaff.bsky.social · 28/05/2025
Kudos to Geologists for saving lives!
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NPR @npr.org · 19/05/2025
Whether you get your forecast from an app on your phone, a website or a meteorologist on TV, most of the underlying information comes from the federal government. By @rhersher.bsky.social
npr.org
Where does your weather forecast come from?
Whether you get your forecast from an app on your phone, a website or a meteorologist on TV, most of the underlying information comes from the federal government.
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Tomer Burg @burgwx.bsky.social · 16/05/2025
Google Maps live traffic is an indicator of the general swath of impact from the tornado in the STL metro. Multiple schools, residential areas, and a major interstate highway in its path
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Dave Zaff @davidzaff.bsky.social · 09/05/2025
We need data, Unidata.
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Dave Zaff @davidzaff.bsky.social · 08/05/2025
Searching for NOAA in today’s news…
A search for ‘NOAA’ in today’s news turns up multiple troubling articles regarding cutback, along with other issues.A search for ‘NOAA’ in today’s news turns up multiple troubling articles regarding cutback, along with other issues.
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Reposted by Dave Zaff
Alan Gerard @wxmanms1.bsky.social · 02/05/2025
More than 1,000 of my former NOAA colleagues left the agency in one day yesterday. I've been seeing a continuous stream of retirement announcements unlike anything I've ever experienced. It's brought a lot of emotions - I talked about them here. open.substack.com/pub/balanced...
open.substack.com
Reflections on a day of change
Thoughts on transitions at NOAA
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Dave Zaff @davidzaff.bsky.social · 01/05/2025
Nice little shelf cloud in Western NY this eve. 5/1/25 2249Z.
Shelf cloud above East Aurora NY.KBUF reflectivity and velocity.
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Dave Zaff @davidzaff.bsky.social · 30/04/2025
Mesoscale marine effects on Lake Erie.
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Dave Zaff @davidzaff.bsky.social · 27/04/2025
A rare Day 3 (Tuesday) convective outlook for Western NY and PA. (30-44% chance for severe weather within 25 mi.) 10% chance for significant severe weather, defined in alt text.
There is a 30-44% chance of severe weather over Western NY and PA on Tuesday, April 29, 2025, and a 10% chance for significant severe weather, defined as:

A tornado that produces EF2 or greater damage.
Wind speeds of 75 mph (65 knots) or greater.
Hail 2 inch in diameter or larger.
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Reposted by Dave Zaff
Brian Matilla @bxmatilla.bsky.social · 24/04/2025
Again I reiterate, the Warn-on-Forecast project is the culmination of stellar work done by all of us on the team. We’ve heard the success stories, we know the community support, and we have so much to learn to make it even better. This is ONE example of bleeding-edge research that deserves to stay.
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Reposted by Dave Zaff
Alan Gerard @wxmanms1.bsky.social · 20/04/2025
ICYMI: NOAA released a statement to NBC News last night in defense of their cuts to NWS. I broke down why it's ludicrous. balancedweather.substack.com/p/special-ba...
balancedweather.substack.com
Special BalancedWx Update: NOAA statement about impacts of NWS staff reductions
And a quick evening severe weather update
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Dave Zaff @davidzaff.bsky.social · 09/04/2025
Oneida Lake is showing off it's lake shadow early this afternoon. Not bad for a little guy compared to Lake Ontario.
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Brian Matilla @bxmatilla.bsky.social · 04/04/2025
This would be nothing short of CATACLYSMIC. I do not put this lightly… Not just NOAA websites, but it will severely affect NWS warning systems, MRMS radar data accessibility, model data accessibility, and more, for services provided by AWS and Google Cloud Platform. Scientific growth will be hurt.
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Lauren Rosenthal @laurenthal.bsky.social · 04/04/2025
Almost all NOAA Research websites that rely on cloud services - including Amazon, Google and WordPress - are poised to disappear at midnight ET Saturday after a contract was targeted for "early termination." Labs may also feel the effects. Story for @bloomberg.com (free link):
bloomberg.com
US Weather Agency Websites to Vanish Under Planned Contract Cuts
The US National Oceanic and Atmospheric Agency is poised to eliminate most websites tied to its research division under plans for the cancellation of a cloud web services contract, a move that could s...
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Dave Zaff @davidzaff.bsky.social · 28/03/2025
Partial solar eclipse information for the Buffalo, NY area tomorrow, Mar 29, 2025: 05:29 AM: Partial eclipse begins (below horizon) 07:02 AM: Sunrise 07:05 AM: Maximum eclipse 07:09 AM: Partial eclipse ends Hardly noticeable, and probably cloudy anyway. www.timeanddate.com/eclipse/in/u...
www.timeanddate.com provides excellent information about upcoming eclipses.  This screenshot shows how much of the sun will be covered by the moons shadow at 7:05 AM at Buffalo, NY.  Not much.This image of the 00Z 3/28/25 HREF run valid at 11Z Saturday shows a high probability of low, mid, and high clouds over Buffalo, NY during the upcoming partial solar eclipse.

https://www.spc.noaa.gov/exper/href/?model=href&product=cloudcover_mean&sector=ne
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Dave Zaff @davidzaff.bsky.social · 21/03/2025
Interesting "ice bridge" on Lake Erie between connecting Long Point, Ontario to PA and NY this afternoon as seen from the NOAA-21 polar orbiter this afternoon. I wouldn't cross it though.
This satellite image taken on 3/21/25 shows ice cover over the eastern end of Lake Erie, along with a thin strip of ice stretching from Long Point, Ontario to the larger area of ice.
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Dave Zaff @davidzaff.bsky.social · 18/03/2025
Lake Erie ice, now down to 18% coverage is flowing nicely today. apps.glerl.noaa.gov/coastwatch/w... geosphere.ssec.wisc.edu#playing:true...;
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Dave Zaff @davidzaff.bsky.social · 15/03/2025
Bassfield MS. (Summary of PTDS from GR3)
PTDS showing the probability of the Tornado Detection Signature heading for Bassfield, MS at 107PM CDT (1807Z) 03/15/2025
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Dave Zaff @davidzaff.bsky.social · 15/03/2025
"TORNADO DAMAGE THREAT...CATASTROPHIC"
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Oklahoma Mesonet @mesonet.org · 14/03/2025
For some quick historical context on today's winds (so far). We have already had more sites measure severe wind gusts (58 mph and greater) than any other single day in our 30 year history. Unfortunately those winds have fueled many wildfires (black spots on satellite). #okwx #okmesonet
Map showing peak wind gusts today. Already a new record with more than 50 sites measuring 58 mph winds and greater.Infrared satellite showing hot spots (black areas) across many locations in Oklahoma - especially north central.
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Oklahoma Mesonet @mesonet.org · 14/03/2025
A fire burned through our Lake Carl Blackwell Mesonet site around 3:41-3:45pm. One of our thermometers measured a 1-minute average temperature of 173 F at 3:42pm. The 2 meter anemometer is now reporting 0, which indicates that it likely was completely melted. #okwx #okmesonet
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Dave Zaff @davidzaff.bsky.social · 13/03/2025
Lunar eclipse viewing looks pretty good for Western NY with mainly high thin clouds overnight. Full eclipse begins: 06:26Z (2:26 am EDT) Maximum Eclipse: 06:58Z (2:58 am EDT) Full Eclipse ends: 07:31Z (3:31 am EDT) www.spc.noaa.gov/exper/href/?... www.timeanddate.com/eclipse/luna...
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Dan D. @wxdepo.bsky.social · 04/03/2025
An excellent report from Penn State’s Weather World on the impacts of the NWS and NOAA cuts last week. Well done @roblydick.bsky.social youtu.be/eeRLVzbqy-k?...
youtu.be
Special Report: NOAA and NWS Cuts
YouTube video by WeatherWorld PSU
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Dave Zaff @davidzaff.bsky.social · 03/03/2025
Some nice hole punches over Western NY this morning. GOES-16 mesosector from 1219-1318Z March 3, 2025.
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Stephen Mullens @srmullens.bsky.social · 14/02/2025
In our effort to appreciate the random person in Nebraska, we failed to appreciate the two unlabeled but much larger blocks beneath even them. That was government investment. 🧵
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Dave Zaff @davidzaff.bsky.social · 26/02/2025
Lake Erie ice cover is down to 81% today. SAR data shows some notable open areas east of Lake Erie Islands and north of Long Point. www.star.nesdis.noaa.gov/socd/mecb/sa... apps.glerl.noaa.gov/coastwatch/w...
Synthetic Aperture Radar (SAR) Wind data, while not a perfect match for ice cover (as it's designed for wind, not ice), shows the open water areas in blue.  This image shows notable open water areas east of the Lake Erie Islands and north of Long Point.    Normalized Calibrated Radar Cross-section (NCRS),  is a better tool to see ice cover.  This image shows notable open water areas east of the Lake Erie Islands and north of Long Point.
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Dave Zaff @davidzaff.bsky.social · 19/02/2025
Like the classic quote in Princess Bride, “mostly dead is slightly alive”… Just because ‘Lake Erie is mostly ice covered’ doesn’t mean we can’t have lake effect snow.
A plume of lake effect snow can be found across Central Erie County, NY around 11:30 AM on February 19, 2025Roads are quickly becoming snow covered within the snow band.
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cira-csu.bsky.social @cira-csu.bsky.social · 24/01/2025
On January 21, 2025, a rare winter storm brought snow to the Gulf Coast and Southeastern United States. Much of Southern Louisiana was blanketed in a historic snowfall. Clear skies the day after the storm revealed a wintry scene.
This image is from the weather satellite NOAA-21 in the GeoColor product from 19:10 UTC on 22 January 2025.
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Dave Zaff @davidzaff.bsky.social · 23/01/2025
Impressive! Ice cover over Lake Erie increased from around 27% on Sunday to near 80% on Wednesday. SAR NCRS does a spectacular job capturing this without cloud interference. #lakeerie www.star.nesdis.noaa.gov/socd/mecb/sa... apps.glerl.noaa.gov/coastwatch/w...
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Dave Zaff @davidzaff.bsky.social · 22/01/2025
Looks like I made it past the 100" mark this week for seasonal snow... 107.3" and counting. Here's my CoCoRaHS seasonal snow summary from 2008-today. It's not an official climatology, but it does roughly match local stats showing this location just above 100"/year. www.weather.gov/media/erh/ta...
Seasonal snowfall statistics for the CoCoRaHS station: NY-ER-50.  The average snow based on this station is 103".  The lowest value was a paltry 39.5" between 2011-2012 (moderate La Nina), with a peak of 185.3" for the 2014-2015 season (weak El Nino), much of it based on the epic snow event in November 2014 and subsequent synoptic and lake effect snow events in Jan-Feb, 2015.A climatology of seasonal snow for Western NY, based on:
https://www.weather.gov/media/erh/ta/ta2018-01.pdf
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Dave Zaff @davidzaff.bsky.social · 22/01/2025
Here's a dprog/Dt of the ECMWF's Extreme Forecast Index (EFI - shaded) and the Shift of Tails (SOT - black contours) for snowfall. Images start on Wed 00Z Jan 15, 2025, and continue at 24 hr time steps.
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