Monthly Archives: June 2015

Snow storm dumps 1 metre deep snow – New Zealand 19 June 2015

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Throughout Thursday and Friday 18 and 19 June, a major snow storm impacted much of the south island of New Zealand. The snow storm brought snow to very low levels.

As seen in the satellite photos MODIS (Acquired from NASA 20 June 2015), this snowstorm has covered vast areas of the south island with snow. Heavy snow has occurred in some mountain ski resorts with two resorts recording up to or close to 1 metre deep of snow from this event. The following snow falls have been recorded:-

Cardrona - 100 cm.
Ohau - 90 cm.
The Remarkables - 80 cm.
Treble Cone 65 cm.
Coronet Peak 46 cm.

Looking at the satellite photos more closely, snow has fallen on the hills close to Dunedin. Snow has also fallen to very low levels at Queenstown and any road with any elevation would have had snow fall occurring. It is likely that the snow storm would have impacted on travel across many roads throughout the the South Island due to its extent and longevity.

India’s monsoon rains and storms and tropical disturbance June 19 2015

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The monsoon has arrived across much of India following the recent heatwave that took a heavy toll across the country. In addition to the heavy downpours, storms and local flood events, a tropical disturbance just off the east coast of India is being closely monitored. As identified in the CIMSS plots (NOAA - June 18/19 2015), this disturbance is enhancing rainfall along the south east coastline of the country.

The investigation area currently has winds of 20 knots at its centre. Satellite imagery is showing active convection occurring which is supported by sea surface temperatures of no less than 30C to 31C. A number of thunderstorms are occurring throughout the country and this type of activity will continue for several days.

The arrival of the monsoon is resulting in forecast daily rainfall of 50 mm to 100 mm due to high moisture available to fuel thunderstorm cells. Based on Accuweather data and reporting, the monsoon has already had dramatic impact in some areas including:-

Mumbai - 575 mm of rain falling between 11 and 17 June with 325 mm occurring on the 18 and 19 June.

The Indian Meteorological Department daily weather and rainfall data has been reviewed and some incredible rainfall has been occurring especially over Assam and Meghalaya State where on June 13, Cherrapunji received 250 mm of rain in one day and another 100 mm of rain on the 14 June. Heavy rain and storm events on a daily basis has contributed to the following daily rainfall totals rounded out:-

11 June - Williamnagar - 170 mm. Bahalpur - 160 mm. Tikrikilla - 150 mm.

12 June - Karwar Observatory - 190 mm (Coastal Karnataka State) Rango - 130 mm (Sikkim State). Kantapada - 130 mm (Odiska State) and Bantwal - 130 mm (Coastal Karnataka State).

13 June - Cherrapunji - 250 mm (Assam and Meghalaya State) and Saroornagar - 130 mm (Telanganda State).

14 June - Girnadam - 160 mm (Madhya Maharashtra State). Cherrapunji - 100 mm (Assam and Meghalaya State).

16 June - Williamnagar - 210 mm and Mawsynram - 180 mm (Assam and Meghalaya State).

Note:- These have been rounded out by the Indian Weather Department and it is noted that these are reported in Centimetres rather than millimetres.

When looking at these more closely, the heaviest rainfall has been occurring in Assam - Meghalaya State in North East India near the Himalayas and it is identified that rainfall for June is already 20% or more above the long term average for that area.

Further, a large portion of India has already received rainfall that is above average for June due to an active monsoon period.

It is also identified that the monsoon has not reached northern central India but this is expected to change as shown in the updated Monsoon Plot (Indian Meteorological Department June 19 2015).

The rains are heavy and causing flooding or capable of causing flooding but it must be remembered that the country needs the heavy rain to support its cropping lands and rice growing production.

Despite such heavy rain and flooding, there are predictions that the overall monsoon season may see rainfall below average due to the El Nino phenomena taking shape.

Tropical storm Bill – Heavy rain and flooding – Texas 17 to 19 June 2015

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As identified in two recent posts, a tropical disturbance rapidly intensified into a tropical storm which was named Bill. The storm event came ashore as forecast over the coast of Texas which is now tracking across the Ohio Valley.

As the storm passed over Texas and Oklahoma states, some heavy rainfall and thunderstorm activity occurred. The three plots generated on the National Weather Service site identifies in great detail the worst affected regions:-

Plot 1 is showing the 7 day rainfall for the period ending 18 June 2015.
Plot 2 is showing the 4 day rainfall for the period ending 18 June 2015.
Plot 3 is showing a daily rainfall for the 18 June.

This storm has produced exceptionally heavy rainfall for the 17 June as follows:-

Alice - Texas - 8.58 inches (Amounts to 218 mm).
Newport - Oklahoma - 8.29 inches (Amounts to 210.5 mm).
Montague - Texas - 8.11 inches (Amounts to 206 mm).
Alvard - Texas - 6.62 inches (Amounts to 168 mm).
Ardmore - Oklahoma - 6.45 inches (Amounts to 164 mm).
Bowie - Texas - 5.96 inches (Amounts to 151 mm).

(Source Accuweather 17/6/15).

More rain has fallen since.

The Ardmore weather station has been reviewed and it is noted that on the 17/6/2015 some 5 inches or 125 mm of rain fell between 3.10 pm and 4.50 pm (100 minutes) which is effectively slightly more than 1 mm per minute for 100 minutes for that period.

The rainfall plots are showing very heavy rain north east of Galveston and north of Dallas but south of Oklahoma City centred on Ardmore and surrounding regions.

There are three regions that have received cumulative totals of 10 to 15 inches (250 mm to 380 mm) as shown on Plot Number 1 (7 day cumulative rainfall totals).

It is also identified that major river flooding is occurring along the Red River at Gainsville where the maximum forecast crest is suggested at being 41 feet (12.3 metres) which would make it the highest river flood crest since 31 May 1987 (Source NWS 18 June 2015).

A review of local weather stations identifies that the rain and storms has passed but has left flooding in its wake for local communities.