Mona Hemmati
@monahemmati.bsky.social
Assistant Vice President @GallagherRe | Adjunct Associate Research Scientist @LamontEarth @ColumbiaClimate | Studying climate with a focus on #ExtremeEvents | Views are my own.
Last year, I experienced Cat 1 Hurricane #Beryl making landfall in Houston. It was both terrifying and fascinating—an intense reminder of nature’s power and how small we can feel in its presence. I can’t imagine what the people of Jamaica and other countries in #Melissa’s path are going through.
October 28, 2025 at 4:08 PM
Last year, I experienced Cat 1 Hurricane #Beryl making landfall in Houston. It was both terrifying and fascinating—an intense reminder of nature’s power and how small we can feel in its presence. I can’t imagine what the people of Jamaica and other countries in #Melissa’s path are going through.
#Melissa is undergoing explosive intensification — winds have surged 50 kt in 24 hours, including 35 kt in the last 12!
Jamaica faces a potentially catastrophic impact as the storm nears. And it’s not just the wind — the 4-day rainfall forecast is astronomical, with 30+ inches expected.
Jamaica faces a potentially catastrophic impact as the storm nears. And it’s not just the wind — the 4-day rainfall forecast is astronomical, with 30+ inches expected.
October 26, 2025 at 12:54 PM
#Melissa is undergoing explosive intensification — winds have surged 50 kt in 24 hours, including 35 kt in the last 12!
Jamaica faces a potentially catastrophic impact as the storm nears. And it’s not just the wind — the 4-day rainfall forecast is astronomical, with 30+ inches expected.
Jamaica faces a potentially catastrophic impact as the storm nears. And it’s not just the wind — the 4-day rainfall forecast is astronomical, with 30+ inches expected.
A Nor’easter is battering the East Coast from Virginia to Connecticut, unleashing widespread flood warnings and powerful wind gusts reaching up to 60 mph—especially along the Jersey Shore.
Current projections:
🟪 3 gauges — Major Flood
🟥 17 gauges — Moderate Flood
🟧 40 gauges — Minor Flood
Current projections:
🟪 3 gauges — Major Flood
🟥 17 gauges — Moderate Flood
🟧 40 gauges — Minor Flood
October 13, 2025 at 10:48 AM
A Nor’easter is battering the East Coast from Virginia to Connecticut, unleashing widespread flood warnings and powerful wind gusts reaching up to 60 mph—especially along the Jersey Shore.
Current projections:
🟪 3 gauges — Major Flood
🟥 17 gauges — Moderate Flood
🟧 40 gauges — Minor Flood
Current projections:
🟪 3 gauges — Major Flood
🟥 17 gauges — Moderate Flood
🟧 40 gauges — Minor Flood
September 5, 2025 at 10:46 PM
#Erin has formed in the southeastern Atlantic and could potentially become the first hurricane of the season. While it’s still too early to determine if it poses a threat to the U.S. East Coast, conditions are becoming increasingly favorable for further intensification.
August 11, 2025 at 8:30 PM
#Erin has formed in the southeastern Atlantic and could potentially become the first hurricane of the season. While it’s still too early to determine if it poses a threat to the U.S. East Coast, conditions are becoming increasingly favorable for further intensification.
Moderate Risk of Excessive Rainfall Issued!
Affects areas along the I-95 corridor from Washington, D.C. to New York City. Rainfall rates may reach up to 3 inches per hour
Localized totals could exceed 5-8 inches.
Do NOT drive through floodwaters!
Affects areas along the I-95 corridor from Washington, D.C. to New York City. Rainfall rates may reach up to 3 inches per hour
Localized totals could exceed 5-8 inches.
Do NOT drive through floodwaters!
July 31, 2025 at 7:45 PM
Moderate Risk of Excessive Rainfall Issued!
Affects areas along the I-95 corridor from Washington, D.C. to New York City. Rainfall rates may reach up to 3 inches per hour
Localized totals could exceed 5-8 inches.
Do NOT drive through floodwaters!
Affects areas along the I-95 corridor from Washington, D.C. to New York City. Rainfall rates may reach up to 3 inches per hour
Localized totals could exceed 5-8 inches.
Do NOT drive through floodwaters!
Stunning sunrise paints the sky over Newark International Airport.
July 17, 2025 at 9:57 AM
Stunning sunrise paints the sky over Newark International Airport.
Grateful for a few extra days to enjoy Florida after the Symposium on Tropical Cyclone Risk in a Changing Climate. A perfect way to unwind after an intense and inspiring week.
#STCRCC
#STCRCC
June 7, 2025 at 12:16 AM
Grateful for a few extra days to enjoy Florida after the Symposium on Tropical Cyclone Risk in a Changing Climate. A perfect way to unwind after an intense and inspiring week.
#STCRCC
#STCRCC
Moderate Risk (Level 4 of 5) issued for far North Texas, much of Central & Eastern Oklahoma, Southeast Kansas, and the Ozarks today. This continues the string of catastrophic convective storm systems that have battered parts of the U.S. in recent days.
#SevereWeather
#SevereWeather
May 19, 2025 at 3:57 PM
Moderate Risk (Level 4 of 5) issued for far North Texas, much of Central & Eastern Oklahoma, Southeast Kansas, and the Ozarks today. This continues the string of catastrophic convective storm systems that have battered parts of the U.S. in recent days.
#SevereWeather
#SevereWeather
The gap between where people live and where insurance remains available is widening across the U.S. We explore this in our recent paper, “The Growing Void in the U.S. Homeowners Insurance Market: Who Should Bear the Rising Cost of Climate Change” co-authored with Ian Gray @stevebowen.bsky.social
April 14, 2025 at 2:21 PM
The gap between where people live and where insurance remains available is widening across the U.S. We explore this in our recent paper, “The Growing Void in the U.S. Homeowners Insurance Market: Who Should Bear the Rising Cost of Climate Change” co-authored with Ian Gray @stevebowen.bsky.social
A powerful weather system is sweeping across much of the U.S., bringing a range of extreme hazards. An extremely critical wildfire threat—the highest level—extends unusually far east into Texas and Oklahoma. Meanwhile, the central U.S. faces an increased risk of tornadoes and severe thunderstorms.
March 13, 2025 at 9:01 PM
A powerful weather system is sweeping across much of the U.S., bringing a range of extreme hazards. An extremely critical wildfire threat—the highest level—extends unusually far east into Texas and Oklahoma. Meanwhile, the central U.S. faces an increased risk of tornadoes and severe thunderstorms.
Stepping away from the chaos for a bit—Colorado’s mountains have a way of leaving their mark. Grateful for the fresh air and perspective!
#steamboatspring
#steamboatspring
February 24, 2025 at 12:36 AM
Stepping away from the chaos for a bit—Colorado’s mountains have a way of leaving their mark. Grateful for the fresh air and perspective!
#steamboatspring
#steamboatspring
February 9, 2025 at 11:24 PM
According to California FAIR Plan’s 2024 data, Malibu (>$4B), Pacific Palisades (~$3B), and Altadena (~$1B) face significant exposures. Coverage in these areas rose by +17%, +29%, and +27%, respectively, with other high-risk communities seeing even larger percentage jumps.
#LAFires
#LAFires
January 24, 2025 at 10:09 PM
According to California FAIR Plan’s 2024 data, Malibu (>$4B), Pacific Palisades (~$3B), and Altadena (~$1B) face significant exposures. Coverage in these areas rose by +17%, +29%, and +27%, respectively, with other high-risk communities seeing even larger percentage jumps.
#LAFires
#LAFires
January 1, 2025 at 5:18 AM
Feeling so lucky to be back on top of Whistler Mountain, Canada! The views are breathtaking, and the weather is everything I could wish for. Truly spectacular!
December 25, 2024 at 5:40 PM
Feeling so lucky to be back on top of Whistler Mountain, Canada! The views are breathtaking, and the weather is everything I could wish for. Truly spectacular!
2024 Hurricane Season Recap #2:
Hurricane Helene- A Wake-Up Call for Resilience and Preparedness
This Category 4 storm struck Florida's Big Bend with 140 mph winds and 15-foot surges (NHC), causing widespread destruction. Key lessons:
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#HurricaneSeason2024 #Resilience #Preparedness
Hurricane Helene- A Wake-Up Call for Resilience and Preparedness
This Category 4 storm struck Florida's Big Bend with 140 mph winds and 15-foot surges (NHC), causing widespread destruction. Key lessons:
1/4
#HurricaneSeason2024 #Resilience #Preparedness
December 18, 2024 at 9:51 PM
2024 Hurricane Season Recap #2:
Hurricane Helene- A Wake-Up Call for Resilience and Preparedness
This Category 4 storm struck Florida's Big Bend with 140 mph winds and 15-foot surges (NHC), causing widespread destruction. Key lessons:
1/4
#HurricaneSeason2024 #Resilience #Preparedness
Hurricane Helene- A Wake-Up Call for Resilience and Preparedness
This Category 4 storm struck Florida's Big Bend with 140 mph winds and 15-foot surges (NHC), causing widespread destruction. Key lessons:
1/4
#HurricaneSeason2024 #Resilience #Preparedness
2024 Hurricane Season Recap #1:
Hurricane Beryl - A Compound TC-Heat Hazard
Hurricane Beryl made landfall in Southeast Texas as a Category 1 storm, leaving over 2.6 million people without power for days. The real challenge? A heatwave that followed, creating a dangerous compound hazard!
Hurricane Beryl - A Compound TC-Heat Hazard
Hurricane Beryl made landfall in Southeast Texas as a Category 1 storm, leaving over 2.6 million people without power for days. The real challenge? A heatwave that followed, creating a dangerous compound hazard!
December 5, 2024 at 12:07 AM
2024 Hurricane Season Recap #1:
Hurricane Beryl - A Compound TC-Heat Hazard
Hurricane Beryl made landfall in Southeast Texas as a Category 1 storm, leaving over 2.6 million people without power for days. The real challenge? A heatwave that followed, creating a dangerous compound hazard!
Hurricane Beryl - A Compound TC-Heat Hazard
Hurricane Beryl made landfall in Southeast Texas as a Category 1 storm, leaving over 2.6 million people without power for days. The real challenge? A heatwave that followed, creating a dangerous compound hazard!
The Accumulated Cyclone Energy (ACE) index reached 161.6, officially categorizing 2024 as an "extremely active" or "hyperactive" season.
3/6
3/6
November 25, 2024 at 8:13 PM
The Accumulated Cyclone Energy (ACE) index reached 161.6, officially categorizing 2024 as an "extremely active" or "hyperactive" season.
3/6
3/6
This season featured 18 named storms, 11 hurricanes, and 5 major hurricanes—exceeding the 1990–2023 averages across all metrics.
2/6
2/6
November 25, 2024 at 8:13 PM
This season featured 18 named storms, 11 hurricanes, and 5 major hurricanes—exceeding the 1990–2023 averages across all metrics.
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2/6
As the 2024 hurricane season nears its conclusion on Nov. 30, it's an opportunity to reflect on its activity and the lessons it offered:
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#2024HurricaneSeason
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#2024HurricaneSeason
November 25, 2024 at 8:13 PM
As the 2024 hurricane season nears its conclusion on Nov. 30, it's an opportunity to reflect on its activity and the lessons it offered:
1/6
#2024HurricaneSeason
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#2024HurricaneSeason
