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Human Hothouse Death Toll Climbs to 2300 in India, Monsoon Suppressed, Delayed

The fifth deadliest heatwave in the global record continues to claim lives in India.

As of earlier today 2300 souls were accounted lost due to oppressive May and early June heat preceding a delayed onset of a substantially weakened annual summer Monsoon. Temperatures across India have ranged from the middle 90s to as high as 114 degrees (Fahrenheit) over recent days with readings remaining in heatwave ranges even throughout the night.

indiaheatwave

(May 25 India Heatwave Map provided by NOAA.)

The above May 25 temperature map by NOAA displays an extreme heat pattern that has remained in place now for weeks over India, with 40 degree Celsius (104 degrees Fahrenheit) temperatures covering a greater portion of the country. Andhra Pradesh, at the center of this hot zone, has seen the most impact with more than 1700 souls lost there as of this morning.

As with most heatwaves, the elderly, the poor, and those who work outdoors have shown the highest losses. In this heatwave, field workers, who survive on daily wages, have been particularly hard-hit. The choice for them has been a brutal one of brave the blazing heat and risk life or stay home in the shade and risk livelihood.

Monsoon Delayed, Weak

A smattering of rain showers has started to infiltrate sections of India as of today, bringing isolated relief. But, overall, the larger Indian Monsoon continues to hold off, delayed at its gates in the Bay of Bengal.

India monsoon

(Monsoon again delayed as heatwave conditions remain entrenched over India. Image source: India’s Monsoon Information Page.)

As of June 2, Monsoonal advance had only proceeded to the typical May 25 line — more than a one week delay. A cruel tardiness for poor, sweltering India.

Adding insult to an already bad climate state for India, as of this morning the Government had also downgraded the expected strength of the monsoon to 88 percent of a typical year. The 12 percent loss of water from the farm-feeding rains would increase risk of an agriculture-disrupting drought in many of India’s states. Such a drought could hit the 50% of India’s non-irrigated farms quite hard while also adding stress to water supplies feeding the irrigated facilities.

A Heatwave that was Almost Certainly Caused by Climate Change

Human-forced warming of the oceans through fossil fuel burning has almost certainly had an impact on this year’s drought and monsoon delay for India. The warming has added about 0.6 C of heat to a now strengthening El Nino over the Equatorial Pacific. In the past, only strong El Ninos provided enough atmospheric heat forcing to delay monsoons, spark powerful heatwaves, and spur droughts across India. Now, even weak to moderate events are having this effect with last year seeing a mere shift toward El Nino conditions delaying monsoonal progress and reducing rainfalls across the region.

In addition, recent studies have found that 75 percent of heatwaves are now caused by climate change globally. So, as with the Texas floods of  the past few weeks, when we are looking at instances of freakishly extreme weather, we are also looking at the growing impact of human-caused climate change.

Unfortunately, due to the delayed monsoon and extreme heat deeply entrenched throughout many regions of India, we can expect a high risk for loss of life to continue for at least the next few days as a weakened and delayed monsoon fights to gain ground. This is an instance of yet another early, easy outlier of the very extreme climate change related weather that will follow, with locked-in conditions worsening so long as we continue burning fossil fuels.

Links:

Extreme Temperatures Kill More than 2,000 in India

Anthropogenic Contribution to Heavy Rainfall and High Temperature Extremes

More than 2300 Have Now Died in India’s Heatwave

NOAA

India’s Monsoon Information Page

Government Downgrades Monsoon Forecast, Stokes Drought Fears

Rains Failing Over India

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Monsoon At Dead Halt: Chances For Summer El Nino Jump to 70% as India Swelters

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Current advance of the Indian Monsoon indicated by the green line vs typical historic advance indicated by the dashed red line. Image source: India Meteorological Department.

The Indian Monsoon arrived in Sri Lanka on June 2nd, 8 days late, with extreme force. Dumping excessive rainfall even for a typically powerful event, it forced 2,500 to flee and resulted in the loss of 22 souls. There it stalled, battening into a Bay of Bengal moisture flow that hasn’t budged since May 23rd.

*   *   *   *

By today, June 5th, powerful storms should be dumping rain over a wide swath including the entire southern tip of India, almost all of the waters between Myanmar and the Tamil Nadu and Andhra Pradesh coasts, and over most of Bangladesh. But in the satellite shot only scattered storms are visible where powerful, wall-to-wall squalls should now cover an impressive swath.

By this time last year, more than a third of India was obscured by cloud. Today, the skies of this nation of 1.25 billion people are ominously clear. The steely-gray aerial tint of coal ash smog is the most impressive feature in an otherwise open expanse from the northwest deserts to the southeast coast. A massive zone showing only sparse hint or hope of rain.

Even Sri Lanka seems mostly cloud-free. The monsoon and, more importantly, the crop-essential rains it brings are walled out, pushed into the margins by El Nino and some of the hottest global temperatures on record.

India monsoon stalled

Blazingly clear skies laced with ominous coal ash over India during a time when monsoonal storms usually advance. Image source: LANCE-MODIS.

Forecasts indicate that some of the long-delayed rain could arrive to the coast by tomorrow through Sunday. Sparse comfort to sweltering interior sections that may not now see the cooling monsoon until after July 1st.

Unrelenting Heat Risks Late Switch to Violent Storms

In the north, the heat and drought just builds and builds. Jaipur recorded its highest temperature in 33 years on Thursday at a scorching 46.3 degrees Celsius (115.3 F). Meanwhile, New Delhi hit a new record high for the day of 45 C (113 F). Forecasts for New Delhi on Saturday and Sunday show the potential for even more extreme heat with temperatures projected to climb to 116 F. Over the coming ten days, the coolest is expected to be Friday of next week at 109 F.

The continued delay of monsoonal rain combines with record heat throughout northern and western sections of India to enhance risks of drought and loss to crops. Heatwave conditions have already reduced Lychee fruit crop yields by 40%. But an extended stalling of the monsoon and ongoing heat could result in increased damage.

Atmospheric thickening that comes with such extreme heat can also spur intense rain and hail events causing another kind of damage to crops. So a flash switch from heat to heavy storms like those seen earlier this week in Sri Lanka may not be so much of a boon as a terrible jolt to affected lands.

Moderate to Strong El Nino Ever More Likely

This year’s monsoonal delay and related extreme weather were likely amplified by a combination of record atmospheric heat due to human-caused greenhouse gas forcing and a growing and strengthening El Nino. In April, global atmospheric temperatures hit new record highs of +.91 C above 1880s values even as El Nino rapidly gained ground in the Pacific through May.

Multivariate ESNO Index values catapulted to +0.93 in May hitting the seventh highest values on record for the month and pushing the current El Nino into Moderate-Strong range for this time of year. During previous years, similar high values resulted in strong El Ninos on 3 of 5 occasions in the climate record. So historical indicators point toward a 60% chance of a strong event emerging by later this year.

From to NOAA’s El Nino Discussion Page:

The long anticipated breakthrough to El Niño conditions in 2014 is clearly under way, leading to the next question of how big it will get. Of the 10 nearest-ranked April-May values, five had clearly come up to this level over the previous three months. Among those five, four continued at El Niño levels through the rest of the year, while one (1993) dropped back to borderline neutral conditions by the end of the year. One (2002) ended up as a weak-to-moderate event, while the other three (1957, 1987, and 1997) are classified as strong El Niño events in the MEI sense. In other words, the simple-minded odds for El Niño remain at or above 80% through the remainder of 2014, and are consistent with previous discussions on this website. The odds for a strong El Niño are perhaps slightly higher than before, somewhere around 60%.

Meanwhile, the official NOAA forecast is more cautious, with model interpretations pointing to a higher likelihood for a moderate El Nino during 2014.

Consensus El Nino Forecast

El Nino probability graph. Image source: CPC.

Overall, chances for evolution to full-blown El Nino rose significantly with today’s forecast now showing a 70% chance for El Nino development by this summer and nearly an 85% chance for El Nino development by Fall-Winter.

Regardless of El Nino strength, such an event is likely to have broad-ranging global impacts in the context of human-caused warming.

India’s Heightening El Nino + Climate Change Threat to Crops

For India, history shows numerous cases of severe monsoonal disruption during strong, moderate, and, recently, even weak El Nino events. In addition, record high atmospheric temperatures enhance extreme drought and flood potentials by amping up the hydrological cycle and thus increasing the rate of both evaporation and precipitation. Storms, where they do occur tend to be both tall and abnormally powerful under current human-warming related stresses even as droughts tend to develop with higher velocity and to persist for longer periods.

It is possible, due to both changes to the hydrological cycle and to atmospheric circulation, that the Indian monsoon has become even more sensitive to the El Nino pattern under current human-caused warming. This year’s monsoonal delay with El Nino just emerging shows an almost instant response to the forcing coming from increased temperatures in the Equatorial Pacific. As such, conditions of heightening threat for crop damage throughout a land where 1.25 billion people rely on the annual rains is a critical issue.

nepac_anomaly_ophi0

(Extraordinary sea surface temperature anomalies in the Northeast Pacific including numerous pools of +2.25 to +4 C or higher departures are indicative of both a strengthening El Nino pattern and a general warming of Ocean surface waters through human greenhouse gas heat forcing. Image source: NOAA Environmental Modeling.)

Overall, the forecast remains for continued monsoonal delay and disruption, continued heatwaves and a likelihood for extreme rainfall and storms in the regions where the monsoon finally arrives. With El Nino conditions in place over the Pacific now, with atmospheric temperatures rising into record range, and with an official El Nino status likely to be declared by summer, this forecast is lent yet more certainty and urgency.

Links:

India Meteorological Department

LANCE-MODIS

NOAA’s El Nino Discussion Page

CPC

North India Reels Under Heatwave

Monsoon Delayed Across India, Deadly Flooding in Sri Lanka

Weather Underground Ten Day Forecast for New Delhi

(Hat Tip to Timothy Chase)

 

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