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March 31, 1630UTC Convective Outlook, featuring two high risk areas. Items portrayed in this file depicts. copyright status. public domain. ... 17:02, 31 March 2023:
The Storm Prediction Center (SPC) is a US government agency that is part of the National Centers for Environmental Prediction (NCEP), operating under the control of the National Weather Service (NWS), [1] which in turn is part of the National Oceanic and Atmospheric Administration (NOAA) of the United States Department of Commerce (DoC).
Convective mesoscale discussions are issued by the National Oceanic and Atmospheric Administration’s Storm Prediction Center based on the National Weather Center in Norman, Oklahoma. [ 1 ] [ 2 ] One type of mesoscale discussion is a meso-gamma mesoscale discussion , which are for tornadoes believed to be at least EF2 on the Enhanced Fujita ...
These storms entered an environment of richer moisture, with dewpoints into the low 60s °F northward to near I-40, and modest instability on the order of 500–1,000 J/kg. Despite the presence of a capping inversion , strong forcing along the cold front was expected to erode inhibition, while low-level winds topping 70 knots (80 mph; 130 km/h ...
SAN FRANCISCO, CALIFORNIA - JANUARY 31: People are seen with umbrellas near Pier 39 during a rainy weather in Fisherman's Wharf of San Francisco, California, United States on January 31, 2025.
At the 1630 UTC update on March 2, however, the 15% hatched area was removed due to lingering uncertainty about the timing of the most favorable wind shear for tornadoes versus the convective mode of the ongoing storms.
A mesoscale convective complex (MCC) is a unique kind of mesoscale convective system which is defined by characteristics observed in infrared satellite imagery. Their area of cold cloud tops exceeds 100,000 square kilometres (39,000 sq mi) with temperature less than or equal to −32 °C (−26 °F); and an area of cloud top of 50,000 square ...
A Day 2 excessive rainfall outlook showing a level 4/high risk of excessive rainfall across central California issued by the Weather Prediction Center on March 9, 2023. California governor Gavin Newsom declared a state of emergency for 34 counties in the state. [9]