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Preliminary Climate Assesment for Bulgaria for 2006

By Peggy Hunt,2014-05-14 09:50
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Preliminary Climate Assesment for Bulgaria for 2006

    Preliminary Climate Assessment for Bulgaria in

    2006

    (Based on data from the basic operational meteorological network of the Bulgarian

    Institute of Meteorology and Hydrology, processed by its Information Center)

Base period for climatology 1961-1990.

2006 is 0.43ºC above normal countrywide which is close to the global temperature

    anomaly (+0.42ºC). Northern Bulgaria is 0.65ºC warmer than normal while Southern

    Bulgaria is only 0.25ºC warmer. The warmest months are August (1.8ºC above normal)

    and October (+1.5ºC). The coldest months are January (1.7ºC below normal) and

    February (-1.0ºC).

2006 is rather normal in terms of precipitations. The average annual amount of

    precipitation per station is 572 mm which is about 96% of the normal. Above normal

    numbers can be found in Northwestern Bulgaria (Vidin 110%, Vraca 104%), the Upper-

    Thracian Valley (Pazardjik 124%, Panagjurishte 115%), the Eastern Rodopi

    (Krumovgrad 123%), and Southwestern Bulgaria (Dragoman 121%, Sofia 109%,

    Kjustendil 104%). In terms of precipitations, Northern Bulgaria is in average 7% below

    normal while Southern Bulgaria is only 2% below normal. The wettest months are March

    (189%) and August (140%). The driest months are May (40%) and November (50%).

    Some of the wettest places are Kotel (March 198mm), Panagjurishte (June 178 mm),

    Malko Turnovo (July 326 mm), Krumovgrad (September 150 mm). The wettest high

    mountain station is Rojen (June 168 mm).

    There are registered 123 days with thunderstorm activity within which there are 60 days

    with registered hailstorms. There are also registered at least 10 days with widespread

    damage from hailstorms in at least 6 administrative regions. June is the month with the

    most widespread and the most frequent (in all of its 30 days) thunderstorm activity.

Details on some of the extreme weather events in 2006 in Bulgaria

    January: Falling temperatures and a snowstorm on 05.01 caused heavy road accidents with casualties and blocked road traffic across the country. Around 24.01 (Razgrad -

    21.0ºC) very low temperatures caused damage and brought victims.

    February: The lowest temperatures were registered on 08.02. On 24.02 and 28.02 there were conditions for icing.

    March: A Mediterranean cyclone brought abundant precipitations (Zlatograd 81mm) on 12.03. Combined with a rapid snow melting, it created favorable conditions for

    overflowing of rivers and water reservoirs and caused floods in the regions of Sofia,

    Kurdjali, Yambol, Pleven, Plovdiv, and Pazardjik. It also provoked land slides at

    endangered sites. There was property loss as well as flooded lands and roads.

    April and May: Around 09.04 in Central Europe, there were favorable conditions for

    abundant precipitations. There was therefore a significant snow accumulation in the Alps

    followed by rapid melting which provoked swelling of rivers in the Danube basin and

    consequent overflowing of the low Danube at the Bulgarian-Romanian border. A state of

    emergency was declared in 12 municipalities bordering the Danube. The monthly average

level of Danube reached 271-316mm above normal. The government intervened in the

    critical region between 12.04 and 04.05 and unblocked 1.4mln. leva to tackle the crisis.

    June: An intensive frontal system brought strong thunderstorms with heavy rain, hail, and gust winds and caused damage in 3 administrative regions in Western Bulgaria on

    02.06. Dragoman reported 50mm of precipitation. There was reported a tornado event

    between Dolno Selo and Jeravino in the region of Pernik. The regions of Northwestern

    Bulgaria, the Upper-Thracian Valley and the Rodopi Mountain also experienced strong

    thunderstorms with heavy rain and hail on 14.06, 15.06, and 20.06. Torrential rains

    caused local floods in Varna (15.06) and Sofia (23.06). Sofia also reported 30-40 mm/h

    of rain intensity and hail grains as big as walnuts.

    July: Eastern Bulgaria suffered damage from torrential rains and gust winds associated with a cold front system passing through around 02.07. Burgas reported 86 mm of rain

    and Obzor 170 mm. On 03.07, Malko Turnovo reported 301 mm, Tokachka 118 mm,

    and Sredec 91 mm. The Black Sea coast suffered the most with flooded camping

    domains, hotels, and restaurants as well as collapsed bridges (in Irakli, Emona, and

    Kiten). The rains also activated land slides at endangered sites. 30.07 also marked

    intensive rain events which caused local floods mainly in the western part of the country.

    Sofia reported 42 mm of rain. A heat wave between 25.07 and 28.07 favored at least 7

    field and forest fires.

    August: There were 2 significant storms on 10-11.08 and on 28.08 and they caused damage in 6 administrative regions mainly in Northeastern Bulgaria: Varna, Veliko

    Turnovo, Shumen, Dobrich, Silistra, Yambol. Extreme rains were reported on 28.08 in

    Shabla 113mm, Varna 54mm, and Straldja 88mm. Varna also reported a tornado

    event and local floods. A heat wave around 18-20.08 hit temperatures as high as 41.6ºC

    in Sandanski and 40.2ºC in Veliko Turnovo. There were reported 9 victims of

    hyperthermia.

By Assoc. Prof. Dr. Petio Simeonov and the Information Center of NIMH

    Sofia, January 2007

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