Elsewhere in Weather News: September 13th, 2014

Severe Flooding in Northern India and Pakistan

Flooding has been the story for both last weekend and this week as heavy monsoonal rains fell across northern India and Pakistan, having its strongest impact in the Kashmir, Jammu provinces and Jhang district. In this case, the heavy monsoonal rains were caused by very moist air advecting in from the Bay of Bengal due to a low pressure system located in northern India. This moist air was then lifted as it interacted with the rugged terrain of northern India and fell as heavy rain. Satellite estimates show that over 350mm fell in the hardest hit areas in a 7 day period, resulting in rivers overflowing their banks and putting residents at risk.

Satellite image of the low pressure system over northern India; combined with orographic lift, it made for heavy rain in the region. Taken on September 5th. (Source: NASA via Wunderground)
Satellite image of the low pressure system over northern India; combined with orographic lift, it made for heavy rain in the region. Taken on September 5th. (Source: NASA via Wunderground)

According to news outlets, 5,000 rescues had to be executed in the flooded region as people scrambled to higher ground. When floodwaters will have receded damages will be significant; about 980 villages in the region have seen flooding problems. On Friday night it was reported that 461 people have died due to the flooding with 600 more injured. Some 60,000 residents continue to evacuate to higher ground, not only in concern of flooding waters but also infrastructure being washed out leading to significant transportation problems for food and clean water. In developing countries the residents are typically affected by not only the initial disaster, but also the aftermath of the disaster. This is the case here as water borne diseases are of great concern to officials and will be a true threat to some residents as floodwaters recede. It’s estimated that over one million people have already been affected by this disaster.

In other news several tropical disturbances have formed in the Atlantic, including a tropical storm in the mid-Atlantic. These should be watched in the next few days, however, there is fairly strong shear in the region currently which is causing problems for these storms to develop further.

Elsewhere in Weather News: September 6th, 2014

East Pacific Continues to be Active

This past Tuesday the 10th hurricane in the Eastern Pacific formed and slowly strengthened into a category two hurricane and remains at this status as of Friday night. The hurricane, Norbert, is not expected to make any landfalls, however it is scraping by the Baja Peninsula region bringing adverse weather conditions to the region. Tropical destinations along the coast such as Cabo San Lucas saw tropical storm warnings as well as hurricane warnings. Norbert’s tropical storm force winds expanded a good distance from its centre which prompted these warnings. In fact, Cabo San Lucas had sustained winds of 98km/h overnight Thursday and combined with strong outer rain bands, this made for nasty conditions.

IR image of Norbert on Friday night. (Source: CIMSS)
IR image of Norbert on Friday night. (Source: CIMSS)

Norbert is expected to slowly continue northwest to its death and stay offshore. One potential benefit is that the remnants of Norbert could help a bit with the drought in California. The tropical plume of moisture should hold together and has the potential to move into southern California next week, making a small dent in the significant drought that is occurring:

The entire state of California is currently in one of the worst droughts on record. Almost 60% of the state is considered to be in exceptional drought.
The entire state of California is currently in one of the worst droughts on record. Almost 60% of the state is considered to be in “exceptional drought.”

The Eastern Pacific hurricane season lasts from mid-May to the end of November and on average features 8 hurricanes. In contrast to the Eastern Pacific hurricane season, the Atlantic hurricane season has been off to another slow start with only 3 hurricanes this year with no real prospects of possible storms in the near future according to the models, even as we approach the peak of the season. The Atlantic sees on average six hurricanes every year.

Elsewhere in Weather News: August 30th, 2014

Montana Sees Unusual August Flooding

The same strong low pressure system that brought 20–40mm to the Red River Valley last weekend brought significant rainfall to parts of central and eastern Montana. These extreme rainfall events in August are uncommon for Montana as strong systems usually stay well north with the polar jet stream and wildfires are typically the concern around this time of the year.

Storm total rainfall for parts of central and eastern Montana (in inches). (Source: NWS Glasgow)
Storm total rainfall for parts of central and eastern Montana (in inches). (Source: NWS Glasgow)

The deep low pressure system brought heavy rain (with a few breaks) to the region between August 21st and the 24th. Combined with abnormally high Precipitable Water values (PWAT) in the region, this made for high rainfall totals throughout the region. Storm total reports between 175mm and 200mm were not uncommon. Glasgow, MT saw around 145mm fall through the event (Aug. 21–24) which is four and a half times their monthly average rainfall for the whole month of August. In comparison to last year, they had less than a quarter of their monthly average rainfall by this time.

Milk River near Glasgow reached major flood stage Monday and Tuesday. (Source: NWS Glasgow)
Milk River near Glasgow reached major flood stage Monday and Tuesday. (Source: NWS Glasgow)

Many rivers in the regions quickly swelled up and spilled their banks including the Milk River which entered major flood stage near Glasgow on Monday. Mudslides also became a concern in the more mountainous regions. It appears that most of the damage due to the flooding occurred to roads and culverts, however some homes were damaged as well. Thankfully, there have been no reports of injuries. Crews are slowly working to rebuild the washed out roads.

More rain is impacting the region today, but nothing close to the magnitude of what was seen last weekend.

Elsewhere in Weather News: August 23rd, 2014

More Wildfires out West

Wildfires continue to be the story out west as large areas of not only western Canada, but also the western United States are experiencing tinder dry conditions. As explained in last week’s EIWN, these conditions are due to the persistent ridging that took place in most of July and early August over the region. The ridge brought limited precipitation and warm, dry air to the western half of North America. The Drought Index reveals this well, showing a large chunk of the western US under severe to exceptional drought.

The Drought Index for this week continues to show significant drought in the west. (Source: USDM)
The Drought Index for this week continues to show significant drought in the west. (Source: USDM)

California which has seen no reprieve from the drought and saw another large wildfire flare up this week near Yosemite National Park. The fire, which started on August 18 just to the north of Oakhurst, quickly grew into a large wildfire that was out of control. Numerous air tankers, as well as 1,300 firefighters on the ground, are actively fighting the blaze. Yesterday the crews were able to gain more control of the fire, which was 95% contained as of Friday night. The wildfire is expected to be under full control by the end of this weekend. Some 500 structures in the path of the wildfire were at risk of getting torched on Tuesday and about 1,000 people had to evacuate from Oakhurst. As of Friday most homes had been saved though, with only 47 structures destroyed by the fire. The wildfire burnt an area totaling 612 acres, a small fire compared to the China Nose Fire discussed in last week’s EIWN which reached 9,100 acres in size this past week.

Map of current wildfires that are burning throughout California, Yosemite fire identified by the arrow. (Source: CAL Fire)
Map of current wildfires that are burning throughout California, Yosemite fire identified by the arrow. (Source: CAL Fire)

The next chance for rain in drought-stricken parts of California looks to be Tuesday as a trough digs into California and brings with it a chance of showers, however, there is signficant uncertainty regarding the strength of the trough.