170 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



A period of rainy weather that set in over the Middle Atlantic 

 and New England States during the closing days of the week end- 

 ing August 11 continued until the middle of the following week, 

 and in areas in those districts the rainfall was excessive. 



On January 30, 1910, the following special forecast was issued: 



Present barometric conditions over the Northern Hemisphere indicate that 

 during the weelc beginning Moud;iy, January 31, temperature will be moderate 

 for the season generally over the United States until the close of the week, 

 when a cold wave is likely to appear in the extreme norlhw(>st and advance 

 thence to the Atlantic coast by the early portion of next week. In the mean- 

 time storms that will roach the Atlantic seaboard about the nnddle and close 

 of the week will be attended by sharj) fluctuations in temperature in Middle 

 Eastern and Northeastern States and by precipitation generally east of the 

 Mississippi. In middle and northern districts the precipitation will be in 

 the form of snow. In the ^Missouri and western Mississippi valleys and the 

 Plains States precipitation will be comparatively light. 



A storm advanced from the Eockies to the Atlantic coast from 

 February 1 to 3, and was attended by precipitation east of the Mis- 

 sissippi and b}" heavy snow in northern portions of New York and 

 New England. In the Missouri and middle and upper Mississipi^i 

 valleys the week closed with a cold wave that advanced thence east- 

 ward over the Atlantic States during the 6th and 7th, attended in 

 portions of the Middle Atlantic States by the lowest temperatures 

 of the winter. A notable feature of this cold wave was the extremely 

 low temperatures noted in the kite flights at Mount Weather, where, 

 at an elevation above the station of 6,700 feet, a reading of 26° below 

 zero was recorded on the morning of February 7. At the station the 

 temperature at the same hour was 14° above zero. 



On February 6 the following special forecast was issued : 



The week beginning Monday, February 7, will open with temperature consid- 

 erably below tiie average for the season over the eastern portion of the United 

 States. Following the cold period in the East, temperature will rise slowly dur- 

 ing the next several days. A disturbance that will reach the Atlantic coast 

 from the Middle West and Northwest about Thursday will be attended by pre- 

 cipitation from the Mississippi Valley eastward; that in more northern States 

 ■will be in the form of snow and will be followed by a change to colder. 



The center of this disturbance reached the Atlantic coast Thurs- 

 day morning. Its advance from the Rockies was attended by rain 

 in the Southern and Middle States east of the Mississippi and by snow 

 from the Lake region over New York and New England. It was 

 followed by a marked fall in temperature and by freezing weather 

 as far south as the middle Gulf coast. 



On Sunday, February 13, the following special forecast was sent 



out: 



During the present w-eek a general storm, followed by a cold wave, will cross 

 the United States. The center of this storm will appear over the Pacific States 

 within the next two days, cross the Rockies, Plains States, and central valleys 

 during the middle days of the week, and reach the Atlantic seaboard by Friday. 

 The cold wave promises to be rather severe. It will overspread the North 

 Pacific States by Tuesday morning, the middle and northern plateau and 

 Rocky Mountain districts by Wednesday morning, the middle and northern 

 Plains States and central valleys by Thursday, and reach the Atlantic sea- 

 board by Friday or Friday night. In the event of warm heavy rains in the 

 near future, the extraordinary depth of snow on the ground in parts of the 

 Lake region and in the mountain districts of the Middle Atlantic and New 

 England States will present conditions favoi-able for freshets and floods in the 

 streams of those regions. The outlook for the present is that a tendency 

 toward flood conditions in the larger streams about the middle of the week 

 will be checked by cold weather that will arrive later in the week. 



