664 MONTHLY WEATHER REVIEW. DECEMBER, 1929
pressure distribution was attended also by a compara- tive absence of stormy weather. A moderate cold wave occurred on the 12th in the northwestern portion of the district, for which warnings had been issued the previous evenin . Warnings were
the district on the morning of the 12th, but verifying tan eratures did not occur. darnings were issued on the morning of the 14th for a cold wave in Oklahoma and the Tesas Panhandle and were extended in the afternoon to include Arkansas and the northwestern ortion of east Tesas; but the
issued in the morning. On the morning of the 16th, cold-wave warnings were issued for the northern portion of west Texas. The cold wave occurred the following morning as forecast. Cold-wave warnings were e-stencled at ni ht on the 16th
northwestern portion of east Texas, and were further extended, on the morning of the 17th, to the coast, except the west coast of Tesas. Cold weather e-xtendecl farther south than in revious cold periods; but the change was gradual an a was most felt in the southern ortion of the district, on the morning of the 19th, when freezing tem erature, or lower, occurred in the interior
Warnings for stockmen were issued in connection with the cold waves. Frost warnings for areas in the southern sections of the district were issued on the 15th, 18th, 19th, 2Oth, 2lst, 22d, 27th, %th, and 31st, and were generally veri- fied. Small-craft warnings were displayed on the Tesas coast on the 12th and were justihed. On the 26th Northwest storm warnings were ordered for the east coast of Texas and were verified. Fire-weather warnings were issued for forested areas in western Oklahoma on the 19th and for areas in western Arkansas and southeastern Tesas on the 26th-R. A. Dyke.
extended over nearly all portions o P the remainder of
cold wave occurred on P y as indicated in the warning
to include northwestern -4rkansas, Okla 9; ionia, and t.he
portions of rF exas and Louisiana.
DENVER FORECAST DISTRICT.
The month was characterized by high temperature. and a deficiency in recipitation, except in the extreme
pressure areas were numerous, and a Plateau high- ressure area domated weather conditions during the fatter half of the month. Warnin s for a moderate cold wave were issued for
of the HIGH was revented, however, by another area
eastwarl over southern Wyoming. The temperature fell 10 to 18 degrees in eastern Colorado, but the warn- in s were verified only in extreme northeastern Colorado,
tana and northeastern Wyomin .
north-central Colorado on the 7th. During the following 24 hours the HIGH moved southward into the Plains States, dividing the disturbance, one portion remaining west of the mountains while the other moved rapidly northeastward to the Lake region. The warnings were verified onl in the extreme north-central portion of
Colorado. 6y the evenin of the 10th pressure was
ranged from 8 to 16 degrees below zero in the anadian
northern portion o P the district. North Pacific low-
eastern Co s orado on the 4th. The southward movement
of low ressure P rom the north Pacific which spread
alt 5l ough zero temperatures prevailed in parts of hlon-
Warnings for a moderate GO 7 d wave were issued for
B
rising along the Canadian B order and the tem erature
Northwest. Warnin for a moderate cold wave was
36 hours in advance. On the morning of the 11th warnings for a moderate cold wave were issued for.Utah, northern Arizona, northern and eastern New Mexico, and for a severe cold wave for eastern Colorado. The warnin s for eastern Colorado and northern and eastern
The warnings were verified in eastern Colorado and east of the mountains in New Mesico, but failed on the western slope owin to the appearance of an area of low ~mssure on tlie talifornia coast. which subsequently nverspread the entire Southwest.
On the morning of the 14th warnings for a moderate cold wave were issued for Utah, northern Arizona, north- ern and eastern New Mexico, and Colorado. A portion of the LOW remained in the Southwest, however, and the warnings were verified only in t,he area east of the moun- tains in New Mexico. Warnings for a moderate cold wave were again issued for eastern Colorado and the district ea.st of tlie mountains in New Mexico. On the evenin of the 1Gth the warnings were verified in eastern New # exico and in parts of eastern Colorado, tempera- tures of zero to 12 de rees above bein reported in
stock warnings were issued for Utah. Moderately heavy precipit,ation occurred in northeim Utah on the 31st and
a temperature of 16 de ees was reported a t Modena 36
were issued on several dates for south-central Arizona a,nd were generally fully verified.-Fredericlr W. Bmkt.
issued for eastern Cio 4 orado on the evening of the loth,
New 2 exico were repeated on the evening of the 11th.
eastern Colorado. On t % e evening of t % e 30th live
hours after the issue o F- the warnings. Frost warnings
BAN FRANCISCO FORECAST DISTRICT.
Unusually stormy weather prevailed in the San Fran- cisco Forecast District during tlie month of December, 1922. From the lst, until the lrtli, a large high- rwsure area extended almost continuously from nort R eastern Aluska southeastward to the Canadian Northwest. This a parently acted as a barrier to the passage of storms
tlie &nited States below the niouth of the Columbia River. As a result the rainfall in California was greater about the 19tli, a high- ressure than usual. area formed over the entral Plateau States an condi- tions from then until near the end of the mouth were more nearly normal. Near the end of the month this high-pressure area disappeared and. the barometer began rising over northeastern Alaska, which caused the storms from the ocean to again take the southern track.
were issued from one or more places on
from the velocity of the wind a t our coast stations,%ut ships only a short distance from the coast experienced the full force of these gales. The most severe storm occurred near the end of the month at which time maxi- mum velocities of 68 miles a t Tatoosh Island, 76 at North Head and 49 at Eureka were reported.
Besides the storm warnings, frost was predicted at one or more places in California on 15 days. Cold-wave warnings were issued for southern Idaho and eastern Oregon on the 11th. The cold wave came as redicted and most of the frosts likewise occurred. Tfe frosts however,. were not severe enou h to do any materid damage in the citrus orchards, t % ough they brought the season to a close so far as grapes, tomatoes, etc., were con- cerned.-E. A. Beak
a r on the nort1ie.rn track and all but one or two entered
Beginn% B
Storni warnin no less than 17 T ays. A few were not justified, jud ing