9:30 AM Wednesday Update... Welcome to day # 74 of 90 degree+ temperatures and day 12 of 100+ temps. The average temperature this summer is now up to 85.78 degrees which is well into 1st place for hottest summer of all time in Little Rock.
I have BIG, BIG news for all of you weather enthusiasts out there. Details later today!
NOON VIDEO UPDATE...
10 PM Monday Update... We hit a record high of 106 Monday and we could set another one Tuesday. The record is 104 set back in 1987.
Below are updated graphics tracking two other key records. We're on track for the hottest summer ever and we could break into the top 5 number of 90 degree days. Stay cool and stay safe.
|Data from the National Weather Service in North Little Rock|
|This is through Monday, August 2nd|
2 PM Monday Update... Have you ever wondered how the heat index is calculated? Remember, it's the combination of temperature and humidity. This is what it "feels like". The higher the moisture values, the less your body is able to cool itself.
HI = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - 6.83783x10-3T2 - 5.481717x10-2R2 + 1.22874x10-3T2R + 8.5282x10-4TR2 - 1.99x10-6T2R2
where T = ambient dry bulb temperature (°F) R = relative humidity (integer percentage).
Here are a few things the equation assumes...
Dimensions of a human. Determines the skin's surface area. (5' 7" tall, 147 pounds)
Clothing cover. Long trousers and short-sleeved shirt is assumed. (84% coverage)
Core temperature . Internal body temperature. (98.6°F)
Determines metabolic output. (180 W m-2 of skin area for the model person walking
outdoors at a speed of 3.1 mph) # Effective wind speed. Vector sum of the body's movement and an average wind speed.
Clothing resistance to heat transfer. The magnitude of this value is based on the assumption that the clothing is 20% fiber and 80% air.
Sweating rate. Assumes that sweat is uniform and not dripping from the body.
8:30 AM Monday Update... Welcome to day 72 of 90 degree+ heat and day number 10 of 100 degree plus heat. Here's some good news, it's looking more and more likely we can take the temperature down a few degrees by the end of the week. Don't get too excited though, it's still going to be HOT!
I'm watching the tropics very carefully. An area of disturbed weather is way out in the Atlantic and the Tropical Prediction Center is giving it a 90% chance for development. IF it has any impact on our weather, it will be in 10-14 days. Once this develops, I will put some links on the computer model page to track the storm.
Yesterday (Sunday), it was amazing to see North Little Rock hit a heat index reading of 121 degrees. Several locations managed to reach 115 or higher and the National Weather Service has issued an Excessive Heat Warning. This is not just hot, it's dangerously hot.
9 PM Sunday Update... I wanted to answer a question in the comment section about rainfall in 1954 compared to 2010. During the entire year of 1954, Little Rock received 37.82 inches. June had .63'', July had 1.27'', and August had .33''.
So far this year in Little Rock, we have received 22.85''. The total amount of rainfall for June and July was 3.60''.
10 AM Sunday Update... It's official, if summer ended today, it would be the hottest summer on record in Little Rock by average temperature. We have now surpassed 1980 and 1954... absolutely amazing. What makes it even more interesting, as stated below, we haven't had a single record high temperature. The heat is very consistent and overnight lows are quite warm.
I do not see ANY significant cool down this week. The ridge of high pressure remains very strong through Wednesday. It could weaken just a bit by the end of the week which could take two or three degrees off the high temperature. In my opinion, what's the difference between 103 and 100? It's still HOT!
In many of these circumstances, the tropics come to life and that can break a heat wave. The 00Z European model does develop a strong tropical system and moves it into the Gulf of Mexico the week of August 8-14. We'll see how that unfolds.