Vimanav From India, joined Jul 2003, 1528 posts, RR: 14 Posted (11 years 5 months 2 weeks 5 days 12 hours ago) and read 2359 times:
The DGCA India issued a fog and bad weather directive today for Northern India which goes as follows:
Weather condition over Northwest India: This office has received a report from the Indian Meteorlogical Dept (IMD) which shows a weather warning for the period 12DEC to 15DEC03. Following is the extract from this report. An intense western disturbance (WD) is expected to approach Northwest India and caused disturbed weather in the form of clouding and precipitation over Jammu and Kashmir, Punjab, Himachal Pradesh, Uttranchal, Haryana and adjoining states during the period 12-15DEC03. As per the numerical model prediction, moderate to heavy rain/snow is likely to occur over the Western Himalayan region and adjoining plains whereas light to moderate rainfall activity is expected over remaining parts of Northwest India. This may also lead to cold weather conditions during the day in association with rain/snow. Subsequently, with the eastward passage of the wd, cold wave conditions and widespread fog may commence over the plain of Northern India. This is for your information and necessary action.
DEL has had a relatively fog less winter thus far. Today has seen short spells of light rain in DEL. Looks like our year end visitor Mr. Fog is knocking at the door.
Sarfaroshi kii tamannaa ab hamaare dil mein hai, Dekhnaa hai zor kitnaa baazu-e-qaatil mein hai
Vimanav From India, joined Jul 2003, 1528 posts, RR: 14
Reply 5, posted (11 years 5 months 2 weeks 5 days 11 hours ago) and read 2236 times:
Are you gonna repeat this post every day now???
Yep, I intend to repeat this post every single day till the fog lasts. Then I'll start one about the withdrawal of fog and keep it on till the fog comes back in winter 2004. .
What's the visual range when it get's thick? And how long does it last?
Visual range can come down to zero (this is from my driving experience where the safest thing to do is pull up to the side and pray that nobody knocks you from behind. The peak fog dates are about 20DEC to 31JAN.
Sarfaroshi kii tamannaa ab hamaare dil mein hai, Dekhnaa hai zor kitnaa baazu-e-qaatil mein hai
B747-437B From , joined Dec 1969, posts, RR:
Reply 6, posted (11 years 5 months 2 weeks 5 days 11 hours ago) and read 2320 times:
I'm going to reproduce (with permission and edits) an excellent overview of the fog history at Delhi for the benefit of those who missed it on the first thread last month.
The effect of seasonal winter fog on airline operations at Indira Gandhi International Airport (DEL/VIDP) in New Delhi, India
Indira Gandhi International Airport (DEL/VIDP) is located at 28°33' 59" North, 77°6' 11" East at a field elevation of 776 feet above sea level. The airport services the metropolitan area of the city of New Delhi (pop. 13,780,000) and is physically located on the outskirts of the nearby town of Gurgaon, Haryana.
The airport is the second busiest in India and serves as the primary international gateway to North India with service from 38 international carriers in addition to flag carrier Air India. It also serves as a hub for domestic carriers Indian Airlines, Jet Airways and Air Sahara. The airport averages 237 daily scheduled commercial movements with daily averages of 23,285 passengers and 667.9 tons of cargo.
The geographical location of Delhi unfortunately is unkind to meteorological conditions at the airport. During the coldest time of year from mid-December to mid-February, the cold dry air coming off the nearby Rajasthan desert tends to drop atmospheric temperatures closer to the dew point temperature. As a result, radiation fog tends to form as the mercury falls during the late evening hours. The fog is exacerbated because of the high levels of ambient pollution from the urban area. The fog usually burns out as the sun rises and temperatures increase during the morning hours.
The primary runway at DEL is runway 10/28 which is 12,500 feet long. Prior to 2001, the runway was equipped with ILS CAT II systems which proved inadequate for operations during severe fog conditions. During the 2000-2001 winter season, conditions below CAT II minima (DH 30m, RVR 350m) existed on 53 separate days. As a result, airlines were forced to divert in excess of 200 inbound commercial flights to alternate airports primarily Mumbai (BOM/VABB), Lucknow (LKO/VILK) and Ahmedabad (AMD/VAAH) located 613nm, 222nm and 408nm respectively from DEL. Airlines were also forced to cancel or reschedule in excess of 500 additional flights.
Following public outcry and pressure from tenant airlines, the Airport Authority of India (AAI), operators of the airport, made a decision to upgrade avionics at the airport to CAT III-A standards for the 2001-2002 winter season. This involved installation of an ASDE ground radar system, centerline lighting systems and RVR equipment along runway 10/28. Accordingly, the runway 28 instrument approach was certified to ICAO CAT III-A standards by the Indian Directorate General of Civil Aviation (DGCA) in December 2001. However, delays with the training of equipment operators to the relevant standards forced AAI to delay the official introduction of CAT III-A capabilities until the 2002-2003 winter season.
Unfortunately during the 2002-2003 winter season, fog of unprecedented severity was experienced. Conditions below CAT III-A minima (DH zero, RVR 200m) existed on 36 separate days, again causing disruptions to scheduled operations. Nonetheless, a total of 58 movements by 16 different operators were accomplished under CAT III-A conditions during the season, primarily by Air India’s Boeing 747-400 aircraft.
Whereas Air India has trained their entire cadre of Boeing 747-400 pilots to CAT III-A standards, the incumbent domestic airlines have not followed suit. Indian Airlines currently has only 12 out of almost 400 pilots certified for CAT III-A operations on their Airbus 320 aircraft, with an additional 23 expected to complete training by December 2003. Air Sahara and Jet Airways each have zero pilots appropriately certified.
For the 2003-2004 winter season, a number of international carriers have taken the drastic step of rescheduling their operations to DEL to avoid the risk of fog delays, despite the disruption to aircraft rotations and hub scheduling that this involves. British Airways will reschedule their daily Boeing 747-400 flight from London Heathrow (LHR/EGLL) for a 1030LT arrival and 1230LT departure between 15-Dec-03 and 8-Feb-04 instead of the regularly scheduled 0125LT arrival and 0325LT departure. Cathay Pacific Airways will reschedule their Airbus 330-300 flight from Hong Kong (HKG/VHHH) for a 1320LT arrival and 1435LT departure instead of the regular 0155LT arrival and 0720LT departure. Both carriers made this decision even though the new schedules will cause Delhi passengers to misconnect with their respective hub banks of North American flights that account for a significant chunk of Delhi-origin traffic. Other carriers including Austrian, Thai Airways International, Singapore Airlines and Asiana Airlines have also rescheduled their flights by 2 hours or more during the December 2003 to February 2004 period to avoid the 2300LT to 0700LT period where the risk of fog is greatest.
Some major operators to DEL including Air Canada, KLM, Deutsche Lufthansa AG and Air France have not made any significant schedule changes yet, but will be monitoring the meteorological conditions closely and examining the need to possibly reschedule their operations at a later time. If forecasts warrant, Air India, the largest international operator at DEL, will implement its annual fog management plan of running Boeing 747 “shuttle service” for DEL passengers to/from the primary hub in BOM and operating all scheduled DEL-origin flights nonstop from BOM instead.*
* Ed note : Plan has subsequently been implemented for date range December 23 - February 4.
Leskova From Germany, joined Oct 2003, 6075 posts, RR: 69
Reply 9, posted (11 years 5 months 2 weeks 5 days 11 hours ago) and read 2176 times:
Great report, B747-437B... to some extent I'm glad that just about the worst delay I've ever had was around 4 hours on a Lufthansa B742 while waiting to go to Chicago (29 December 2000, LH B747-200 "Köln", D-ABYX)... I'm not quite sure if that was due to snow in FRA or due to the snow in ORD...
United777 From United States of America, joined May 1999, 1657 posts, RR: 0
Reply 11, posted (11 years 5 months 2 weeks 4 days 22 hours ago) and read 2077 times:
Oh Man you have to love Delhi during the good old winter foggy days! Zero visibilty is not shocking! I remember trying to get a flight to ICN on OZ. The flight never even came in and diverted to BOM. I just had fun looking at the airport operations because none of the international flights made it in that night.
Just one question, it was said that BA and CX did re-schedule there flights and passengers to North America will not be able to connect to flights to North America. I was wondering what those airlines were doing for the passengers. Are they putting them in hotels? Also how are passengers flying from North America to Delhi effected?
By the way thanks for keeping us people that are intrested updated on the fog in Delhi!
Mog From , joined Dec 1969, posts, RR:
Reply 12, posted (11 years 5 months 2 weeks 4 days 15 hours ago) and read 2040 times:
Here I am at the Air Sahara lounge in BOM, my last flight to DEL etd 2035 has already been rescheduled to depart an hour later and faces are looking grim outside. The news from home is that the smog fog is starting to fall.
TKMCE last flight IC BOM/DEL is etd 2300, still showing on time.