March (Final Month of Winter)

In March, the average daily maximum temperature rises to approximately 28°C. However, prevailing winter synoptic patterns continue to influence the region. This overlap between residual winter systems and increasing thermal energy enhances atmospheric instability, providing a more favorable environment for cloud development and convective activity. As a result, March is one of the most meteorologically variable months in Dubai.

Accordingly, March records the highest frequency of thunderstorms in the year. Historical data indicate an average of six rainy days per month, with a maximum of 18 days recorded. The mean monthly precipitation is 21 mm, while the historical maximum reaches 155 mm. As in February, during periods of unsettled weather, winds may shift abruptly to the southeast, advecting warm, dry desert air toward the coast. While temperatures in the latter half of the month have reached as high as 40°C, an absolute minimum of 11°C has also been recorded, highlighting the significant intramonth variability.

April (Onset of Summer)

With increasing solar elevation, April generally brings more settled and fair weather conditions to the United Arab Emirates. The average daily maximum temperature rises to approximately 33°C. Humidity levels are typically lower than in summer, and while winter-type synoptic patterns may still occur, their frequency decreases significantly. Mean monthly precipitation is around 7 mm, with an average of three rainy days; however, exceptional years have recorded totals of up to 60 mm.

As the land–sea temperature contrast increases, the coastal afternoon sea breeze becomes more pronounced. At the same time, rising surface temperatures can intensify occasional convective storms, sometimes producing heavy rainfall and squalls.

Notably, in 1981, a particularly severe thunderstorm produced hailstones the size of golf balls. In 2003, a storm event recorded sustained winds of 53 kt with gusts reaching 71 kt.

As the month progresses, the upper-level jet stream begins to shift northward. Cut-off lows detached to the south can bring unstable conditions and cooler northwesterly winds to the region. Meanwhile, coastal sea surface temperatures reach approximately 25°C and continue to rise.

① Uncertainty in Thunderstorm Forecasting

Thunderstorms in March–April present significant forecast uncertainty. Beyond predicting occurrence, it is particularly challenging to determine the precise onset time and duration of operational impact, complicating tactical decision-making for flight operations.

② Compound Risk of Sandstorms and Thunderstorms

During spring, dust events and convective rainfall may occur within the same synoptic regime. The mechanisms driving visibility reduction differ, resulting in varying recovery times. In sandstorms, visibility below 1,000 meters may persist for more than one hour, making the timing of operational resumption more difficult to assess.

③ Abrupt Wind Shifts

The transitional seasonal pattern increases the likelihood of sudden wind shifts. In particular, a shift to southeasterly flow can introduce hot, dry air and reduced visibility, directly affecting runway configuration and aircraft performance considerations.