“Meteorologist” sounds like “meaty urologist,” and the pun has been printed on several images. “By the way, why are all the weather forecasts on television given by meaty urologists?” was asked in the Pittsburgh (PA) Post-Gazette on December 5, 1981.
     
“What do you call a carnivorous weatherman?”/“A meat-eater-ologist” is a related riddle.
 
           
Wikipedia: Meteorology
Meteorology is a branch of the atmospheric sciences which includes atmospheric chemistry and atmospheric physics, with a major focus on weather forecasting. The study of meteorology dates back millennia, though significant progress in meteorology did not occur until the 18th century. The 19th century saw modest progress in the field after weather observation networks were formed across broad regions. Prior attempts at prediction of weather depended on historical data. It wasn’t until after the elucidation of the laws of physics and, more particularly, the development of the computer, allowing for the automated solution of a great many equations that model the weather, in the latter half of the 20th century that significant breakthroughs in weather forecasting were achieved.
 
Wikipedia: Urology
Urology (from Greek οὖρον ouron “urine” and -λογία -logia “study of”), also known as genitourinary surgery, is the branch of medicine that focuses on surgical and medical diseases of the male and female urinary-tract system and the male reproductive organs. Organs under the domain of urology include the kidneys, adrenal glands, ureters, urinary bladder, urethra, and the male reproductive organs (testes, epididymis, vas deferens, seminal vesicles, prostate, and penis).
       
5 December 1981, Pittsburgh (PA) Post-Gazette, “Bad officiating or sour grapes?” by Bruce Keidan, pg. 11, col. 1:
By the way, why are all the weather forecasts on television given by meaty urologists?
Steven M. Segal
 
Google Groups: net.jokes
weather.pun
pyuxjj!ol2
11/29/82
How about this (half?) pun, evoked when listening to “Accu-weather Reports”:
Meaty Urologist
       
Google Books
The Miracle of Language
By Richard Lederer
New York, NY: Pocket Books
1992
Pg. 12:
Try, for examples, to stake out the boundaries between no notion and known ocean, buys ink and buy zinc, meteorologist and meaty urologist, and cat’s kills, cat skills, and Catskills.
 
14 May 1992, Milwaukee (WI) Sentinel, “Golfing tips save strokes, lose partners” by Alex Thien, pg, C1:
A FRIEND ASKED John Aboya recently what qualities are shared by weather procrastinators and rotund doctors.

When John was stumped, his colleague said: “You might say they are both Meaty Urologists.”
 
19 May 1997, The Globe and Mail (Toronto, ON), pg. A1, col. 1:
Your Morning Smile,”
If an overweight doctor took up weather forecasting, could we call him a meaty urologist?
     
Google Books
The Word Circus:
A Letter-Perfect Book
By Richard Lederer
Springfield, MA: Merriam-Webster, Incorporated
1998
Pg. 95:
What’s the difference between a weatherman and a corpulent bladder expert?
One is a meteorologist; the other is a meaty urologist.
 
12 April 1999, San Francisco (CA) Chronicle, “Eh? Say What? Monty Green?,” pg. E8:
MONDEGREENS are everywhere. The “meaty urologist” who reports the weather on KCBS—ever so many have heard him.
     
13 May 2001, Atlanta (GA) Journal and Constitution, “The Vent,” pg. E2:
Did you ever notice that “meteorologist” sounds like “meaty urologist?”
   
Reddit—Funny
You won’t hear it the same again: meteorologist sounds like meaty urologist (self.funny)
submitted November 11, 2015 by hackopsv2
 
Reddit—Jokes
What’s the difference between a weatherman and an overweight doctor that handles the urinary tract?
submitted August 4, 2016 by wigwamspiderman
One’s a meteorologist and the other’s a meaty urologist.
     
Reddit—Shower Thoughts
Meteorologist sounds exactly like Meaty Urologist.
submitted September 23, 2017 by defacedlawngnome
 
Reddit—Dad Jokes
My local radio station really needs to hire an actual weatherman. (self.dadjokes)
submitted January 16, 2018 by ManiAAC41
I want to hear more about the big storm system in the area but they keep asking for updates from a “meaty urologist.”