Technical Analysis Behind Fast Winds In Pakistan
Today was the last day of this historic prolonged Windy weather Notable Maximum wind gusts:- Technical Analysis Behind Fast Winds In Pakistan
Islamabad_Capital_Territory: 76 km/h at G-8/2;
Rawalpindi Tehsil: 68 km/h at Bassali Village
Waisa (#Attock): 76 km/h
Shehbaz Garhi (#Mardan): 64 km/h
WINDS have significantly decreased now. Such a prolonged period of intensely DRY, NOR-WESTERLY, NON-CONVECTIVE WINDS (i.e. winds that occur in the absence of thunderstorms) all the way from Peshawar valley to the Potohar region and in to Punjab has not been witnessed in recent history. Humidity levels dropped between 5-10% which is usually seen in Baluchistan & desert areas during this time of the year. We gad forecasted this event in advance Alhamdullilah.
▪According to our analysis, these winds were associated with the passage of a cold LOW PRESSURE Western Disturbance in Upper parts of Pakistan on Monday and the presence of a HIGH PRESSURE area associated with a heatwave over Arabian sea and South Pakistan.
▪ Analysis of 500mb pressure charts revealed that the enhanced gradient between these two pressure system in the mid-troposphere resulted in an intensified and persistent north-westerly wind that blew along the lines of equal pressure known as isobars. The Jetstream was perfectly aligned over our region with jet-streaks concentrated over western half of Pakistan.
Clear sunny skies during the day promoted vertical mixing via dry thermal convection permitting high-speed winds from Northern latitudes to be conveyed downward close to the surface. With a strong pressure gradient , the winds blew during night time as well as the day . The strong winds prevented the development of any surface inversion so there was little change between day time and night time wind speeds.
▪ This is substantiated by the fact the surface pressures during this time were unusually low for this time of the year and did not rise to levels seen before the storms as well as the temperature difference between NW Pakistan and Southern Pakistan after the WD departed was huge because of a prevailing HEATWAVE in South.
In summary, the High Pressure gradient between South and North Pakistan enhanced the nor-westerly winds that normally blow after a WD departs. More research is being carried out regarding non-convective winds.
*NOTE: This phenomenon can not be attributed to the Jetstream only because it does not explain why the winds were concentrated and intense in the Western half of Pakistan at night nor can it be attributed to any low pressure system over India because these winds very absent across most of the plains of India especially at night.
FORECAST:(next 24 hrs.)
(#Tonight): Clear & Cool with a chilly morning . Expected #MIN temp: ISB city: 7-9°C, RWP: 11-13°C!
(#Tomorrow- 3rd April): Mostly SUNNY & VERY WARM.
Max temp: 27-29°C .#Winds: NW/W/SW @ 5-20 km/h; max. gusts 35 km/h.
Past 24 hours: |Max / Min #temperatures (in °C)
| #Islamabad: Banigala… 25.5 / 11.8 ; H-8/2….27.2 / 12.5 ~
New Islamabad Airport 28.0 / 12;
|#Rawalpindi: Bahria Ph.2. .. 27.0 / 17.9°C ;Westridge….27.1 / 16.9°C
Total Pollen Count was 760 in Sector H-8-2 Islamabad which is HIGH