Home / Weather / The function of climate on December seventh, 1941 and a little bit identified essential oblique receive advantages

The function of climate on December seventh, 1941 and a little bit identified essential oblique receive advantages

Visitor submit by way of Paul Dorian,


The elements on Oahu, Hawaii within the early morning hours of Sunday, December 7th, 1941 was once in no way ordinary for the time of 12 months with gentle temperatures and basically transparent skies. Sadly, the elements prerequisites on that specific day would play a job within the bombing of the U.S. naval base by way of Jap fighter planes at Pearl Harbor close to Honolulu, Hawaii. As Jap combatants crossed the Pacific Ocean, they got hope that their venture would be successful when the announcement was once fabricated from “clouds most commonly over the mounts…visibility just right”. It’s believed that the verdict to assault on that specific day had masses to do with the projected favorable climate prerequisites.


Exact hourly climate observations proven right here as recorded by way of the elements observer at Hickam Box in Honolulu, Hawaii at the morning of December 7, 1941. The highlighted textual content seems to mention “obstructions to visibility at this (scribbled)” after which what seems to be the phrase “terrified”. The obstruction to visibility right now may have been “smoke”. The elements observer on these days was once PFC Sherman Levine of the USA Air Corps and he died all over the assault, most probably a couple of mins after finishing the final commentary in this small slip of paper.  For extra at the lifetime of PFC Sherman Levine, click on right here.



In 1941, Hawaii was once a territory of the USA with statehood some eighteen years away. As early because the 1870’s, the USA army had scoped out the islands for business and defensive doable and made up our minds that Pearly harbor at the south facet of Oahu about ten miles northwest of Honolulu are compatible the invoice. With the power industry winds blowing from the northeast lots of the 12 months, this actual a part of Oahu is within the rain shadow of the Koolau Vary. Whilst clouds and rain are not unusual within the Koolau Vary, the downsloping winds generally tend to dry out for southern facet of the island. In truth, Honolulu averages simplest about 17 inches of rainfall in a given 12 months because of the drying results of the downsloping winds.


Pearl Harbor is within the “rain-shadow” of the Koolau Vary at the south facet of Oahu

At the morning of December 7th, 1941, the elements observer at Hickam Box in Honolulu reported basically transparent skies each and every hour with gentle temperatures and light-weight east-to-northeast winds. There was once not anything that might impede fighter pilots traces of sight, no heavy cloud quilt and no heavy rains to make flight tough on that fateful day. After crossing the tough waters of the North Pacific, the Jap fighter pilots in additional than 350 planes reported seeing a “lengthy white line of coast” regarding Oahu’s Kakuku Level (in step with Nationwide Geographic, AccuWeather). In abstract, so far as the elements was once involved, all was once favorable for the assault that were deliberate “many days or perhaps weeks upfront” in step with President Roosevelt in his well-known speech given on the next day to come.

Regardless that the USA suffered a great deal on that specific morning due largely to the usually transparent sky prerequisites, the elements in fact performed the most important oblique advisable function for the country. The usEnterprise (CV-6) was once coming again to Pearl Harbor from Wake Island and was once in fact scheduled to reach at the morning of December 7th, nevertheless it was once not on time because of tough seas. In step with the previous director for the USA Naval Institute, Paul Stillwell, “the vessel was once at the back of agenda returning to Pearl Harbor, and as a result of this was once now not provide for the assault. The Endeavor performed a considerable function all the way through the rest of the warfare, and had it been in port that day, issues will have been very other.”


Aerial view of USS Endeavor at sea in 1945 (courtesy Wikipedia)

USS Endeavor (CV-6) was once the 7th U.S. Military vessel to undergo the title. Colloquially referred to as “The Large E”, she was once the 6th airplane provider of the US Military. A Yorktown-class provider, she was once introduced in 1936 and was once one among simplest 3 American carriers commissioned ahead of International Warfare II to live to tell the tale the warfare. Had the mighty vessel made it again to Pearl Harbor on agenda, she would were engaged by way of Jap combatants and most probably broken or destroyed. Because it became out, the united statesEnterprise earned sufficient commendations (20 Fight Stars) to grow to be probably the most embellished US send in International Warfare II.


Pennsylvania Army Museum in Boalsburg, PA has two of the weapons from the united statesPennsylvania

One of the most battleships broken at Pearl Harbor was once the united statesPennsylvania (BB-38). After a 3 month restore, it returned to motion in 1942. On August 12th, 1945, 3 days ahead of Japan surrendered, the united statesPennsylvania was once broadly broken by way of a Jap torpedo at Okinawa. The torpedo’s have an effect on led to a hollow of roughly 30 toes in diameter in her stern. Twenty males have been killed and ten have been injured. Two of the ships 14 inch weapons at the moment are on show on the Pennsylvania Army Museum in Boalsburg, PA (supply Dr. Jon Nese, Penn State College: video dialogue courtesy YouTube:

Meteorologist Paul Dorian

Perspecta, Inc.


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