Worldwide All Hazards Briefing for 12 May 2018, 11:00 am EDT / 15:00 GMT

World Synopsis – Severe thunderstorms for parts of the U.S. while Spain and Austria could also see some strong to isolated severe thunderstorms.  Still rainy for parts of Asia, India, and New Zealand.


Tropical Severe Weather –



Western Pacific – TD #4 remains a non-threatening storm system.


North America Severe Weather


US / Canada Synopsis: The NWS Storm Prediction Center is forecasting an Enhanced Risk of severe weather for parts of OH, WV, PA, MD, NJ and DE on Sat. Severe thunderstorms with damaging winds will be the main threat, but some tornadoes are also possible. A Slight Risk is forecast for a long swath of the Mid-Atlantic and Lower Great Lakes, stretching from northern IL to DC to the NJ/DE coasts.


Severe Thunderstorm Outlook – There is an ENHANCED / SLIGHT RISK with the development of severe thunderstorms as severe thunderstorms producing damaging winds and some hail will be possible through tonight across portions of the Midwest/Ohio Valley eastward to the Mid-Atlantic Coast.


Northern Rockies of Montana and WyomingFlood Warnings and Watches remain in effect throughout western Montana as the spring snowmelt and heavy rains has been causing spring flooding in a number of counties.  This afternoon a Pacific system will move through the region bringing in more heavy rains of 0.5 inches to 2 inches, thus exacerbating the flooding threat.

In southwestern Montana and western Wyoming, Winter Storm Warnings and Advisories are in effect as it is a different story as the storm system will ushering heavy snows of a foot or more in some mountain locations.



anada – Widespread severe weather is not expected.


International Severe Weather


Caribbean / Central / South AmericaWidespread severe weather is not expected.


EMEA – For Europe, for today and Sunday – Some strong to severe thunderstorms are expected over northeastern Spain and northeastern Austria with large hail being the main threat.

For southeastern Norway, Flood Warnings remain in effect for Hedmark.

For Sunday, mostly quiet.

Asia / Pacific Rim – Southern ChinaHeavy Ranis – Through Saturday, the Yangtze-Huaihe basin, western and northern South of the Yangtze River and western South China will get moderate to heavy rain.

Southern South China will still experience heavy rain or rainstorm. The convective precipitation in South China will become weaker than a few days ago. But, in eastern Guangxi and southwestern Guangdong, there will be the rainstorm with short-term severe precipitation, thunderstorm, gale and other convective weather.


Indochina Peninsula – Thunderstorms with heavy rains will bring the threat of isolated flash flooding from Vietnam to far southern Myanmar.



India – For Sunday:

♦ Thunderstorm accompanied with squall (wind speed reaching 50-70 kmph) and hail very likely at isolated places over Jammu & Kashmir, Himachal Pradesh and Uttarakhand.

♦ Thunderstorm accompanied with squall (wind speed reaching 50-70 kmph) very likely at isolated places over Uttar Pradesh, Gangetic West Bengal, Jharkhand, Bihar and Odisha.

♦ Thunderstorm accompanied with gusty winds very likely at isolated places over Punjab, Haryana, Chandigarh & Delhi, Assam & Meghalaya, Nagaland, Manipur, Mizoram & Tripura, Vidarbha, Chhattisgarh, south Madhya Maharashtra, South Interior Karnataka, Lakshadweep, Kerala and Tamilnadu & Puducherry.

♦ Heavy rain very likely at isolated places over South Interior Karnataka, Lakshadweep and Kerala.


New Zealand – Periods of heavy rain for northern and central parts of the North Island. A broad low over the Tasman sea is directing a moist northerly flow over the North Island through to Monday, with a series of embedded troughs. This regime is forecast to bring rain to much of the North Island during this time, especially northern and central areas. The heaviest rain is expected about eastern Bay of Plenty (east of Whakatane) and Gisborne north of Ruatoria, where a warning is in force. This Watch is for the possibility of rainfall accumulations reaching warning criteria over Northland, Auckland, Coromandel Peninsula, remainder of Bay of Plenty, Rotorua, Taupo, Waikato, Waitomo, Taumarunui, Taihape, remainder of Gisborne and the Hawkes Bay Ranges.  People are advised that this is a complex situation and to keep up to date with the latest forecasts in case any areas in this Watch need upgrading to a full Warning or further areas are added.


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