Orange alert: As back-to-back WDs drench northern India this week, cold snap conditions are expected to ease | The Weather Channel – Articles de The Weather Channel


Rainfall forecast for the next seven days

(TWC Met Team)

Monday 03 January: After a freezing cold snap, northern and northwestern India are expected to experience isolated rains and snowfall this week. Intermittent winter rains are a normal occurrence in the northern states of India and are usually brought on by Western Disturbance (WD). This week, two of those rain-bearing WDs are on their way to the northern hills, providing much-needed relief from the cold snap in the northwest plains.

On Monday, meteorologists noted the first Western disturbance on the Arabian Peninsula, which is likely to affect northwest India from today. The system will trigger widespread rainfall in the Western Himalayan region through January 7. It is also expected to produce scattered to fairly widespread rains over Delhi, Punjab, Haryana, northern Rajasthan and Uttar Prades from Wednesday.

As a result, the Indian Meteorological Department (IMD) has kept Jammu and Kashmir, Ladakh and Himachal Pradesh under control. orange alert for Tuesday and Wednesday as forecasts suggest heavy isolated rains. In addition, Uttarakhand, Punjab, Haryana, Delhi and Rajasthan are also on orange alert for Wednesday January 5. An orange alert means “be prepared” for inclement weather conditions.

In addition, a WD intense is expected to affect the region later this week, starting Jan. 7. Under its influence, rains and snowfall are expected to increase across the Western Himalayan region from Friday to Sunday, with isolated heavy falls on Saturday.

Foggy Sunday morning in Delhi on January 2, 2021 (Prem Bisht / BCCL, Delhi)

Foggy Sunday morning in Delhi on January 2, 2021

(Prem Bisht / BCCL, Delhi)

Due to consecutive WDs, an area of ​​low pressure with relatively cold air mass over the upper layers will develop over northwest India by Friday morning and affect Delhi-RCN. In addition to scattered and moderate rainfall, isolated heavy rains, thunderstorms and hailstorms are forecast over Delhi-NCR, Rajasthan, western Madhya Pradesh, Punjab, Haryana and Uttar Pradesh from Friday to Friday. Sunday.

Western disturbances are low pressure systems that form over the Mediterranean Sea and are pushed towards India by high altitude westerly winds. The disturbances collect moisture from different sources along the way, including the Mediterranean, Caspian and sometimes even the Arabian Sea, and then dump it into northern India.

In addition, DEOs have a double impact on winter cold across the northern plains. They attract the humid winds from the northern Indian Ocean and limit the cold winds from the northwest of central Asia. As a result, minimum or nighttime temperatures increase. However, as clouds envelop the area, the morning sun fails to warm the area, causing daytime temperatures to drop.

On Monday morning, Delhi base station at Safdarjung recorded a minimum temperature of 5.4 ° C, two units below normal. However, as WDs begin to affect the area, nighttime mercury levels are expected to rise sharply, providing much needed relief from the ongoing cold snap. By Wednesday, January 5, the minimum temperature is expected to increase to close to 10 ° C and stay around this level until the end of the week, while the daytime high drops below 20 ° C.

IMD has confirmed that no cold snap is likely over northern and northwestern India for the next 5-7 days. IMD declares a cold snap when the minimum temperature drops to 4 ° C or when the minimum temperature is less than 10 ° C and 4.5 units below normal.

Delhi’s air quality has deteriorated to ‘severeSunday with a 24-hour average Air Quality Index (AQI) of 404, according to the Central Pollution Control Board (CPCB). As the level of PM10 surpassed 300, the Air Quality and Weather Forecast and Research System (SAFAR) also issued a health advisory stating that sensitive people should consider reducing prolonged efforts or intense and heavy outdoor work. On Monday morning, SAFAR reported that Delhi’s AQI remains “very low” at 366.

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