08/31/2023, 10:36 am EDT

Based On ACE Index, 2023 About 33% More Active Than Normal So Far

The latest seasonal totals so far assembled by Colorado State University (CSU) indicates 11 tropical storms have formed with 3 reaching hurricane strength including 2 major hurricanes. The accumulated cyclone energy (ACE) index is 48.6 compared to the normal value for this date of 36.3. Using the ACE index, the 2023 season so far is judged about 33% more intense than normal.
08/31/2023, 8:25 am EDT

Late Season Heatwave Focused on the Mid-Atlantic Next Week

ECM (and GFS) project a Mid-Atlantic heatwave for next week. The hot weather begins on Sunday and strengthens rapidly on Labor Day. The following work week brings persistent heat beneath sunny skies each day particularly in the Mid-Atlantic region. High temperatures are consistently in the mid-to-upper 90’s in the Washington, DC area with a string of 97’s as far west as Cincinnati.
08/30/2023, 6:07 am EDT

Extraordinarily Warm (and Dry) U.S. Medium-range Forecasts

The U.S. shifts into an extraordinarily warm September pattern as indicated in today's medium-range forecast which trends warmer in the 11-15-day period as indicated by ECM ENS. Almost the entire U.S. is warmer than normal as mid-September arrives.
08/30/2023, 6:02 am EDT

Idalia Will Strike Northwest FLA Coast as Strong Cat-4 Major Hurricane

Idalia has realized the potential energy produced by 87F/31C ocean water temperatures and intensified rapidly to a 940 MB category-4 major hurricane this morning. Additional intensification is likely before landfall along coastal Taylor County around 8AM this morning. NOAA/NHC has increased their storm surge forecast to 12-16 feet near and east of the landfall location.
08/28/2023, 11:50 am EDT

El Nino Strengthening But Subsurface A Lot Different From 2015 El Nino Episode

El Nino is strengthening. Oceanic El Nino warmed to +1.5C in the Nino34 region last week. Warming to >+1.0C finally reached the Dateline. The southern oscillation index (SOI) for August is projected near -1.00 which is the second monthly stronger El Nino-style -SOI of the past 4 months.
08/28/2023, 4:10 am EDT

Extreme Rains Across China

During the past week extreme rains have caused massive evacuations in China due to flash flooding and swollen rivers. Much of the China wheat, soybean, and corn areas have been hit hard by heavy rain. The upper-level low pressure trough during the past week has lodged itself over Northeast China located in-between an amplified upper ridge over Northern Japan in response to a large marine heat wave in that vicinity and an upper ridge which has defeated the Indian Monsoon.
08/27/2023, 8:50 am EDT

TD 10 Becomes Tropical Storm Today, Likely Major Hurricane NE Gulf Later Tuesday

In the Climate Impact Company Sunday Report, the latest information on TD 10 reveals an evolving system likely to become a tropical storm soon. The record warm northeast Gulf of Mexico surface water indicates potential for an over-achieving storm once reaching that zone. HMON/HWRF hurricane forecast models each indicate 950-953 MB category-3 major hurricane prior to a northwest coast of Florida landfall early on Wednesday.
08/25/2023, 9:47 am EDT

Does it Seem Like U.S. Summer is Lasting Longer?

Given the warmer oceans and constricting ice cap of recent decades, there is a tendency for warmer climate vs. the 30-year normal and September in the U.S. is an example. During the past 10 years, September has averaged 1-3F warmer than the 30-year normal, making summer feel longer.
08/24/2023, 8:24 am EDT

To Date, U.S. Summer 2023 Not That Hot

Despite historical heatwaves striking Texas, the Southeast, California, and now the Midwest U.S., the remainder of summer has not featured hot weather and high electricity demand areas in the East U.S. have avoided long-term heat extremes.
08/23/2023, 3:47 pm EDT

Summer 2023 CDD’s For The U.S.

The latest U.S. population weight CDD forecast was adjusted slightly warmer (321 to 329) for August which is a moderately hotter than normal signature (compared to the 30-year normal). August 2023 will average slightly less hot than the past 3 years.