Valley's Fruit Crop Hinges
On A Voice In The Night
A radio voice, familiar to hundreds of listeners in the San Joaquin Valley, returned to the air Tuesday night at 6:30. Nightly until the middle of May, Walter Hattman goes on the air directly over some radio stations and feeds information to other TV and radio stations and newspapers. But his audience has been paying little attention so far, the weather has been too warm But with the first cold snap Stanislaus, San Joaquin and Merced farmers will listen closely to Hattman's nightly forecasts.
From Many Sites
Based upon the information supplied by Hattman, a meteorologist of the U.S. Weather Bureau, farmers in the three counties can then decide whether go to bed for a good night sleep or set the alarm to light up smudge pots in almond and peach orchards in the middle of the night.
At 4 o'clock every afternoon, a teletype machine in his office at the Agricultural Extension Service in County Center No. 3 in Modesto starts clacking away, giving surface and upper air data from U.S. Weather Bureau observation throughout the U.S., and from stations in Canada and weather observation ships far at sea.
The teletype machine receives information until 6 o'clock.
Meanwhile, Hattman is busy plotting the information on weather map and making his area analysis. At a few minutes past 6 p.m. he is ready to predict the temperatures for the Central Valley broadcasts through Fresno radio and TV stations in the south, Tracy in the west and Stockton in the north. Most stations carry the frost warnings three times nightly. He can tell almond, peach, grape and tomato growers at that hour during the night dangerous temperatures and killing frosts will occur and how long they will last.
Growers Decide
Growers then decide whether to fire up the smudge pots to keep the freezing temperatures away from delicate fruit buds. Grape growers, who rarely use heat in their vineyards, may prepare to irrigate. The water will raise the temperature about four degrees, says Hattman which is often enough to prevent heavy damage. Irrigating is of little value in raising the temperature in tree fruit orchards, however.
Tree fruit, unlike grapes, is too high off the ground to benefit from the warmer water.
Often Overlook
Hattman said growers often tend to overlook the use of heaters after three or four years of warm winters. But, after three or four years of cold winters every grower keeps his heaters handy." Besides preparing and feeding fruit frost information to radio and TV stations, Hattman maintains thermographs at 26 locations throughout his three-county area. The devices keep accurate records of temperatures 24 hours per day and record the temperatures on a roll of graph paper. "When a grower is having problem and he thinks it is because of cool temperature durations, I can check the nearest thermograph and can tell exactly how many hours the temperature was down to such and such a degree."
Various Locations
Hattman, 50, joined the U.S Weather Bureau 25 years ago after working with weather data aboard Navy ships during World War II. For 20 years, the bureau sent him from Washington, D.C. to Chicago, Il., and various other locations, including Guam and the Marianas Islands outside the U.S. Hattman said he had heard about the bureau's Fruit Frost Service and asked to be asked to be assigned to it. He became a Californian five years ago. But still Hattman and his wife live something of a life which is anything but routine.
During the winter months, he is stationed in San Diego, where he gives frost warnings mainly for citrus and avocado crops during the late winter and spring. About mid-February to mid-May, he comes to Modesto and then he completes the cycle in Sacramento where he makes weather analysis during the forest fire season.
'No Real Home"
"We have no real home,' Hattman said. "We live in apartments at all three locations. Our friends are strung out all over the state. When Hattman and his wife change locations, it is like returning home, he said. "Our friends never seem to have changed much except that we just haven't seen them in a while." "Moving around like we do makes it very difficult to follow hobbies, so I have very few any more," Hattman said. "But the toughest thing about moving is there's always a number of loose ends to tie up at the old location and any number of preliminary things to take care of before opening up shop at the new one," he said. "That always makes for a rough first two or three weeks."
Feb. 25, 1968