1. Western United States and Southwestern Canada:
CHILLY WEATHER RETURNS
Many locations reported daily-record minimum temperatures, with readings
dropping below freezing as far south as Winnemucca, NV (41°N). Temperatures
were as much as 6°C below normal in western Montana and 5°C below
normal in southern California. Weekly departures of -3°C to -4°C
were common across the Northwest, but temperatures began moderating as
the week ended [COLD - 2 to 3 weeks].
2. Central United States and Adjacent Canada:
HIGHLY VARIABLE CONVECTIVE PRECIPITATION REPORTED
Widely scattered thunderstorms dropped 20 to 200 mm on the Great Plains,
Corn Belt, and western Great Lakes while adjacent areas received little
or none. Since the beginning of April, between 100 and 550 mm of
precipitation has fallen on the region, resulting in moisture excesses
of 100 to 300 mm from the Texas Panhandle and eastern Colorado northeastward
to southeastern Minnesota and northern Indiana [WET - 4 to 13 weeks].
3. Eastern United States and Southeastern Canada:
HIGH TEMPERATURES EXACERBATE DRYNESS
In sharp contrast to the West, many locations in the East reported daily-record
high temperatures early in the week, with the mercury soaring to 36°C
at both Huntington, WV (38°N) and Columbus, OH (40°N). The early-season
heat wave aggravated the dry conditions across the eastern United States
and resulted in weekly departures of +5°C to +8°C west of the Appalachians,
but easterly flow from the Atlantic resulted in temperatures averaging
from 1°C to 5°C above normal [WARM - 2 to 7 weeks]. Little or no
rain fell on the mid-Atlantic, central Appalachians, eastern Great Lakes,
and southern New England while up to 50 mm fell on South Carolina and northern
Georgia, the St. Lawrence River Valley, and the Canadian Maritime Provinces.
Since the beginning of April, moisture shortages of 100 to 200 mm accumulated
along the Atlantic Seaboard while moisture deficits ranged from 50 to 100
mm along and to the west of the Appalachians [DRY - 4 to 12 weeks].
4. Northern South America and Southern Caribbean:
VERY DRY CONDITIONS INDICATED
Satellite data suggest that significant dryness has developed across northern
Venezuela and the southern Caribbean, but reliable data are lacking [DRY
- 4 to 7 weeks].
5. Central South America:
AN EARLY-SEASON COLD SNAP
Temperatures were 1°C to 4°C below normal across Bolivia, Paraguay,
northern Argentina, and adjacent parts of Brazil, with subfreezing lows
as far north as Santa Catarina state in southern Brazil and northwestern
Formosa and northeastern Salta provinces of northern Argentina [COLD -
2 to 3 weeks].
6. Southern and Eastern Europe and Northwestern Africa:
ANOMALY SHIFTS EASTWARD
Temperatures averaged above normal over Europe from the western Mediterranean
Sea northeastward to Belarus and the Ukraine and eastward to Turkey and
the western Black Sea (+2°C to +7°C) and over northeastern Africa
from eastern Morocco eastward to Tunisia (+1°C to +6°C).
Temperatures reached as high as 37°C at Sanliurfa, Turkey (37°N)
and 34°C at Lubny, Ukraine (50°N) [WARM - 2 to 12 weeks].
7. East-Central Africa:
PRECIPITATION DEFICITS REMAIN
Isolated moderate to heavy showers (20 to 100 mm) were reported in west-central
and southeastern Kenya, but little or no rain was reported across most
of the region. Short-term (April 1 - June 12) precipitation deficits ranged
from 50 to 200 mm [DRY - 5 to 8 weeks].
8. Northeastern China:
DRYNESS DEVELOPS
Less than 5 mm of rain fell on Manchuria as unusually dry conditions evolved
over the past two months. Moisture deficits since April 1 approached 100
mm at some locations [DRY - 4 to 8 weeks].
9. Southeastern Asia:
WETNESS CONTINUES
Moderate to heavy rains (20 to 100 mm) again soaked much of the Indochina
Peninsula and the northern portion of Sumatra. Since the first of April,
precipitation totals (moisture excesses) reached as much as 1175 mm (+830
mm) in Vietnam, 1650 mm (+550 mm) in Thailand, 650 mm (+205 mm) in Malaysia,
and 890 mm (+485 mm) in northern Sumatra [WET - 4 to 21 weeks].
10. Indonesia:
DRYNESS CONTINUES
Scattered rains (up to 20 mm) dampened parts of Java while dry weather
covered the Lesser Sundas. Since the first of April, precipitation amounts
(moisture deficits) totaled as little as 100 mm (-200 mm) on Java, and
350 mm (-255 mm) in the Lesser Sunda Islands [DRY - 4 to 6 weeks].
11. Eastern Australia:
UNSEASONABLY WARM WEATHER PERSISTS
Temperatures averaged as much as 8°C above normal, with highs reaching
32°C as far south as Richmond, Queensland (21°S). The mercury soared
above 30°C throughout the northwestern quadrant of Queensland and exceeded
20°C in northeastern New South Wales [WARM - 2 to 6 weeks].