National Hurricane Center (NHC) Morning Update
The tropical landscape across the Northeast Pacific has undergone a complete transformation over the last 24 hours, culminating in a highly complex and congested synoptic battlefield this morning. The most significant development overnight was the official demise of Cristina. The National Hurricane Center confirms that the system has rapidly lost its well-defined circulation center and has degenerated into a weak surface trough of low pressure hugging the coast of El Salvador near 13.2°N 89.1W. The system maintains residual maximum sustained winds of 20 knots with gusts to 25 knots and an estimated minimum central pressure of 1007 mb.
While Cristina has been stripped of its tropical cyclone status, its sprawling, decaying moisture field remains incredibly volatile. A massive field of deep tropical convection is actively exploding, showing numerous strong convective clusters in the Gulf of Tehuantepec and adjacent waters from 12°N to 18°N between 92°W and 97°W. Additionally, scattered to numerous moderate convective bands extend across land from 12°N to 21°N between 81°W and 92°W. This intense moisture pool is moving northwest at 6 knots and will continue to dump absolute buckets of heavy rainfall across coastal Central America and southern Mexico today, maintaining a severe, life-threatening risk of flash flooding and mudslides in steep terrain.
Beyond the immediate tropical remnants, a major synoptic disruptor is dictating real-time conditions further north. A broad and elongated surface trough of low pressure extends from offshore the Baja California peninsula near 30°N 122°W southwestward to 10°N 129°W. This sprawling system has successfully broken apart, compressed, and backed off the dominant subtropical high-pressure ridge to the west. This massive structural failure of the oceanic ridge has loosened the regional pressure gradient, forcing winds into a mostly moderate or weaker category across the open waters.
However, this elongated offshore trough is actively interacting with the unseasonably intense desert thermal low over the interior basins. This setup is creating a powerful cross-peninsular vacuum pump that is pulling the saturated boundary layer inland and throwing thick cloud decks across the region.
Offshore waters within 250 nautical miles of Mexico are currently seeing 6 to 7 feet seas across the open Pacific, but a highly energized mixed swell environment is slamming the northern outer shelf. A persistent, long-period southerly swell train originating from the southern hemisphere is directly clashing with residual northwest swell energy, forcing combined significant wave heights up to a much rougher 7 to 9 feet well offshore Baja California Norte. Inside the Gulf of California entrance, conditions run far more protected with seas at 3 feet or less, though local moderate to fresh westerly wind surges are raking the southern tip of Baja California Sur and venting through the mountain gaps.
Tropical Weather Outlook & Analysis
Friday will bring the official dissipation of Cristina’s surface center over Central America, but its massive residual moisture plume will become entirely absorbed into the broad monsoon trough. This active trough line remains deeply entrenched, stretching from northern Colombia across the southwest Caribbean Sea, through Panama, Costa Rica, and Nicaragua, before emerging into the Pacific somewhere near 12°N 87°W and extending out to 10°N 140°W.
Over the weekend, the massive convective fields left in Cristina’s wake will likely merge with this active monsoon boundary, maintaining an extremely unstable environment across the southern waters of Mexico.
While organized cyclogenesis is not expected anywhere across the Eastern North Pacific over the next seven days, small craft and offshore vessels traveling through the Gulf of Tehuantepec must brace for severe localized wind shifts, blinding downpours, and squall lines that will easily drive localized seas well above forecast baselines.
Further north, the models predict for the broad, elongated trough off the Baja California coast to begin to slowly retrograde westward into the open Pacific. As it pulls back, the intense inland desert thermal engine will take complete control of the peninsular weather pattern.
This weekend will see a rapid reduction in the mid-level cloud decks as the deep tropical moisture tap is squeezed southward, opening the door to what will likely be intense solar radiation, driving interior desert spaces and the mountains into an exceptionally hot phase.
Along the western coastline, a tightly compressed marine boundary layer will hug the immediate beaches, keeping the coastal zones comfortably cool, while the clashing northerly and long-period southerly swells off the northern coast gradually decay, allowing outer seas to ease down to moderate levels.
Long-Range Tropical Climatology & Future Outlook
Looking further out into the second half of June window and the weeks ahead, we are tracking key planetary-scale climate drivers that suggest this current lull in tropical cyclone activity will be short-lived.
While the National Hurricane Center explicitly notes a zero probability of named storm development over the next seven days, the underlying thermodynamics across the equatorial Eastern Pacific remain highly primed for an aggressive summer season.
The primary driver to watch over the next two to three weeks is the projected movement of the Madden-Julian Oscillation (MJO).
Extended global modeling indicates that a powerful, convectively active phase of the MJO is currently tracking across the western Pacific and is slated to filter into the western hemisphere as we approach late June. When this upper-level velocity potential anomaly centers itself over the Eastern Pacific, it dramatically enhances large-scale upward motion and atmospheric upward-tilting transport.
This will lift the current stable lid off the monsoon trough, creating an environment exceptionally conducive to rapid tropical development.
When this favorable MJO window aligns with the current marine environment, the results could turn volatile very quickly. As our updated morning SST logs verified, sea surface temperatures at the cape confluence have already surged into an unseasonably warm tropical range, hitting a hot 81°F to 84°F, while Scripps Pier data further north confirmed record-breaking water temperatures extending deep into the water column.
This means the thermal energy ocean heat content is already several weeks ahead of schedule.
Once the MJO enhances the monsoon trough in late June, any embedded low-pressure areas drifting off the coast of southern Mexico will have immediate access to an incredibly high-octane fuel tank of very warm seawater.
We should prepare for and expect the possibility of a rapid transition from our current tranquil state into a highly active phase of tropical cyclogenesis as we head toward July, with a strong probability of seeing fast-developing systems tracking northwestward along the outer edge of the Baja Pacific shelf.
We will be monitoring these long-range convective anomalies around the clock as the Tropical macro-climate evolves.
Satellite-Radar Imaging - NE Pacific
Wind Forecast Models
