John Allen (@jtallen3) 's Twitter Profile
John Allen

@jtallen3

Assoc. Prof. of Meteorology @CMUniversity Severe Weather & Climate, Hail, Tornadoes Extreme Weather Impacts, Storm Chaser, Personal Account, Opinions my own

ID: 410441823

linkhttp://people.cst.cmich.edu/allen4jt/Allen_Homepage.html calendar_today12-11-2011 03:22:13

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1,1K Followers

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John Allen (@jtallen3) 's Twitter Profile Photo

Yep, that’s chilly this morning. Going to make for an interesting discussion of internal energy or at least the lack thereof.

Yep, that’s chilly this morning. Going to make for an interesting discussion of internal energy or at least the lack thereof.
John Allen (@jtallen3) 's Twitter Profile Photo

Send in the plows. Snowpack depth is going to be pretty impressive be end the weekend around Central Michigan with blowing snow likely to be a real issue into Sunday. Looks like strong potential for a long duration amalgam of a couple of systems with moderate snowfall rates.

Send in the plows. Snowpack depth is going to be pretty impressive be end the weekend around Central Michigan with blowing snow likely to be a real issue into Sunday. Looks like strong potential for a long duration amalgam of a couple of systems with moderate snowfall rates.
John Allen (@jtallen3) 's Twitter Profile Photo

Folks in the Isabella count area incl. Central Michigan U. there is a line of severe thunderstorms approaching from the southwest. Wind reports with these storms are up to 70 mph, and there have also been embedded tornadoes. Be prepared for strong storms in next 20-30 minutes #miwx

ICECHIP (@nsf_icechip) 's Twitter Profile Photo

SAVE THE DATE! In 2 weeks on Saturday, May 17th from 2-4 pm, ICECHIP will be holding a media/field day to display instruments that will go into making this a successful study, including Doppler on Wheels (DOW)! This event is open to the public. Learn more below👇 eol.ucar.edu/field_projects…

SAVE THE DATE!

In 2 weeks on Saturday, May 17th from 2-4 pm, ICECHIP will be holding a media/field day to display instruments that will go into making this a successful study, including <a href="/DOWFacility/">Doppler on Wheels (DOW)</a>! This event is open to the public. 

Learn more below👇 
eol.ucar.edu/field_projects…
ICECHIP (@nsf_icechip) 's Twitter Profile Photo

Are you in NE Colorado? Want to help out the #ICECHIP effort? We would deeply appreciate very large hailstones found by chasers or the community to be bagged & tagged and handed off to one of our teams! For labeling, please: • Write time, lat, and lon of collection!

John Allen (@jtallen3) 's Twitter Profile Photo

We got into big hail yesterday, a massive storm merger, 70m/s updrafts and some crazily large hailstones. Fun fact, that’s my hand holding this monster to send for lab analysis. Stone weighed 462gm (>1lb) after half an hour of rain melting. Another outstanding ICECHIP case.

ICECHIP (@nsf_icechip) 's Twitter Profile Photo

Chasers! NSF ICECHIP is looking for your help to obtain hail measurements. While we are out in the field, if you happen to have collected a large or interesting hailstone, feel free to bag it and place in cooler with the date, time and location to share with one of our teams…

Chasers! NSF ICECHIP is looking for your help to obtain hail measurements. While we are out in the field, if you happen to have collected a large or interesting hailstone, feel free to bag it and place in cooler with the date, time and location to share with one of our teams…
Andrew Freedman (@afreedma) 's Twitter Profile Photo

SCOOP: The National Weather Service has secured permission to hire about 125 new meteorologists & other specialists as it faces acute staffing shortages in wake of Trump admin. cuts cnn.com/2025/06/02/wea…

IBHS Hail Study (@ibhshailstudy) 's Twitter Profile Photo

Capturing the size distribution and impact energy of falling hailstones is essential during every Insurance Institute for Business & Home Safety #hail field deployment. 🧰 One of the key tools in this effort is the disdrometer - a specialized impact probe to measure #hailstone characteristics in real time.

IBHS Hail Study (@ibhshailstudy) 's Twitter Profile Photo

RECAP: ICECHIP teams targeted a supercell in Oklahoma on Tuesday where they documented large hail. IOP 19 wraps up Insurance Institute for Business & Home Safety's participation in the ICECHIP program, but other teams will continue operating through the upcoming weekend.