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.
#Melissa has set new benchmarks on several fronts.
Melissa Records:
Strongest Atlantic Landfall (Tie)
3rd Strongest Atlantic Hurricane (Tie)
World Record Driest/ Clearest Eye
3rd 2025 Cat 5 (2nd most)
4th Extreme Rapid Intensification Episide of 2025 (tied for 1st place)
1/
Strongest Atlantic Landfall (Tie)
3rd Strongest Atlantic Hurricane (Tie)
World Record Driest/ Clearest Eye
3rd 2025 Cat 5 (2nd most)
4th Extreme Rapid Intensification Episide of 2025 (tied for 1st place)
1/
October 28, 2025 at 10:54 PM
#Melissa has set new benchmarks on several fronts.
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.
Reposted by Mona Hemmati
ICYMI: This week we released our Natural Catastrophe & Climate Report: Q3 2025
www.ajg.com/gallagherre/...
YTD Totals
Economic Loss: >$214bn (-37% from 10-Yr Avg)
Insured Loss: >$105bn (-8% from 10-Yr Avg)
US billion-dollar economic loss events: 20+ (7th year in a row)
(1/n)
www.ajg.com/gallagherre/...
YTD Totals
Economic Loss: >$214bn (-37% from 10-Yr Avg)
Insured Loss: >$105bn (-8% from 10-Yr Avg)
US billion-dollar economic loss events: 20+ (7th year in a row)
(1/n)
October 17, 2025 at 4:47 PM
ICYMI: This week we released our Natural Catastrophe & Climate Report: Q3 2025
www.ajg.com/gallagherre/...
YTD Totals
Economic Loss: >$214bn (-37% from 10-Yr Avg)
Insured Loss: >$105bn (-8% from 10-Yr Avg)
US billion-dollar economic loss events: 20+ (7th year in a row)
(1/n)
www.ajg.com/gallagherre/...
YTD Totals
Economic Loss: >$214bn (-37% from 10-Yr Avg)
Insured Loss: >$105bn (-8% from 10-Yr Avg)
US billion-dollar economic loss events: 20+ (7th year in a row)
(1/n)
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
Reposted by Mona Hemmati
🚨 Open Call for new Steering Committee Members 🚨
Are you working on #risks from #extremeEvents under #environmentalChange?
Join us as Risk KAN Steering Committee member for the upcoming term: www.risk-kan.org/about-riskka...
www.risk-kan.org
@futureearth.bsky.social @wcrpclimate.bsky.social.
Are you working on #risks from #extremeEvents under #environmentalChange?
Join us as Risk KAN Steering Committee member for the upcoming term: www.risk-kan.org/about-riskka...
www.risk-kan.org
@futureearth.bsky.social @wcrpclimate.bsky.social.
September 8, 2025 at 1:33 PM
🚨 Open Call for new Steering Committee Members 🚨
Are you working on #risks from #extremeEvents under #environmentalChange?
Join us as Risk KAN Steering Committee member for the upcoming term: www.risk-kan.org/about-riskka...
www.risk-kan.org
@futureearth.bsky.social @wcrpclimate.bsky.social.
Are you working on #risks from #extremeEvents under #environmentalChange?
Join us as Risk KAN Steering Committee member for the upcoming term: www.risk-kan.org/about-riskka...
www.risk-kan.org
@futureearth.bsky.social @wcrpclimate.bsky.social.
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
Reposted by Mona Hemmati
Today is the "official" start to the Atlantic hurricane season. It is impossible to know what exactly will occur, but we can look to sea surface temperatures for clues.
2025 is definitely cooler than 2024 on June 1. Parts of the basin are warmer than recent analog years in 2008 / 2017.
(1/n)
2025 is definitely cooler than 2024 on June 1. Parts of the basin are warmer than recent analog years in 2008 / 2017.
(1/n)
June 1, 2025 at 6:59 PM
Today is the "official" start to the Atlantic hurricane season. It is impossible to know what exactly will occur, but we can look to sea surface temperatures for clues.
2025 is definitely cooler than 2024 on June 1. Parts of the basin are warmer than recent analog years in 2008 / 2017.
(1/n)
2025 is definitely cooler than 2024 on June 1. Parts of the basin are warmer than recent analog years in 2008 / 2017.
(1/n)
Reposted by Mona Hemmati
Today we at Gallagher Re have released an initial assessment that estimates the May 14-20 stretch of US thunderstorms will drive $4-7 billion in insured losses. Uninsured damage is expected to drive the overall direct economic cost higher by at least another billion.
(1/2)
(1/2)
May 22, 2025 at 9:56 PM
Today we at Gallagher Re have released an initial assessment that estimates the May 14-20 stretch of US thunderstorms will drive $4-7 billion in insured losses. Uninsured damage is expected to drive the overall direct economic cost higher by at least another billion.
(1/2)
(1/2)
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
Reposted by Mona Hemmati
Excited to host the first #RiskKAN symposium at @iiasa.ac.at with presentations and a panel on #multi-hazard risks in a changing world on april 28th.
This kicks-off the new #Risk-KAN WG-structure co-chaired by @marleenderuiter.bsky.social, S.Singh and myself.
iiasa.ac.at/events/apr-2...
This kicks-off the new #Risk-KAN WG-structure co-chaired by @marleenderuiter.bsky.social, S.Singh and myself.
iiasa.ac.at/events/apr-2...
1st Risk-KAN Symposium at IIASA
The 1st Risk-KAN Symposium will be held on the 28th of April at the International Institute for Applied Systems Analysis (IIASA).
iiasa.ac.at
April 23, 2025 at 12:25 PM
Excited to host the first #RiskKAN symposium at @iiasa.ac.at with presentations and a panel on #multi-hazard risks in a changing world on april 28th.
This kicks-off the new #Risk-KAN WG-structure co-chaired by @marleenderuiter.bsky.social, S.Singh and myself.
iiasa.ac.at/events/apr-2...
This kicks-off the new #Risk-KAN WG-structure co-chaired by @marleenderuiter.bsky.social, S.Singh and myself.
iiasa.ac.at/events/apr-2...
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
Reposted by Mona Hemmati
Ideas for reform: stronger building codes, not developing risky areas, and a federal catastrophe backstop program designed for highly climate-vulnerable areas—covering those rare tail events with excessive losses once they exceed a prescribed limit, modeled on the Terrorism Risk Insurance Act (TRIA)
NEW PUBLICATION ALERT
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
The growing void in the U.S. homeowners insurance market: who should bear the rising cost of climate change? - npj Climate Action
npj Climate Action - The growing void in the U.S. homeowners insurance market: who should bear the rising cost of climate change?
www.nature.com
April 14, 2025 at 2:07 PM
Ideas for reform: stronger building codes, not developing risky areas, and a federal catastrophe backstop program designed for highly climate-vulnerable areas—covering those rare tail events with excessive losses once they exceed a prescribed limit, modeled on the Terrorism Risk Insurance Act (TRIA)
Reposted by Mona Hemmati
NEW PUBLICATION ALERT
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
The growing void in the U.S. homeowners insurance market: who should bear the rising cost of climate change? - npj Climate Action
npj Climate Action - The growing void in the U.S. homeowners insurance market: who should bear the rising cost of climate change?
www.nature.com
April 14, 2025 at 11:53 AM
NEW PUBLICATION ALERT
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
"The growing void in the US homeowners insurance market: who should bear the rising cost of climate change?
Co-authors: @monahemmati.bsky.social & Ian Gray
(1/n)
www.nature.com/articles/s44...
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
Reposted by Mona Hemmati
Weather-related indemnity payout data for 2024 still coming in from the USDA's federally run crop insurance program. Total now tops $9.5B with drought accounting for >$4.1B alone.
Several factors explain why loss payments have increased since 1990. Yes, more anomalous weather is one of them.
Several factors explain why loss payments have increased since 1990. Yes, more anomalous weather is one of them.
February 19, 2025 at 10:39 PM
Weather-related indemnity payout data for 2024 still coming in from the USDA's federally run crop insurance program. Total now tops $9.5B with drought accounting for >$4.1B alone.
Several factors explain why loss payments have increased since 1990. Yes, more anomalous weather is one of them.
Several factors explain why loss payments have increased since 1990. Yes, more anomalous weather is one of them.
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
Reposted by Mona Hemmati
Today we (Gallagher Re) released our Natural Catastrophe & Climate Report for 2024.
Global Totals (All Perils)
Economic Loss: $417 billion
Insured Loss: $154 billion
Weather / Climate Only
Economic: $402 billion
Insured: $151 billion
www.ajg.com/gallagherre/...
(1/4)
Global Totals (All Perils)
Economic Loss: $417 billion
Insured Loss: $154 billion
Weather / Climate Only
Economic: $402 billion
Insured: $151 billion
www.ajg.com/gallagherre/...
(1/4)
January 21, 2025 at 2:23 PM
Today we (Gallagher Re) released our Natural Catastrophe & Climate Report for 2024.
Global Totals (All Perils)
Economic Loss: $417 billion
Insured Loss: $154 billion
Weather / Climate Only
Economic: $402 billion
Insured: $151 billion
www.ajg.com/gallagherre/...
(1/4)
Global Totals (All Perils)
Economic Loss: $417 billion
Insured Loss: $154 billion
Weather / Climate Only
Economic: $402 billion
Insured: $151 billion
www.ajg.com/gallagherre/...
(1/4)