Temperature records could fall today
The National Weather Service is predicting that high temperature records will fall Friday at all three regional airports. The record at BWI-Marshall for this date is 95 degrees. That's also the forecast high for the day, but Sterling's prognosticators frequently underestimate the "summer" highs for Baltimore. Stay tuned.
UPDATE, 3 p.m.: Instruments at BWI show 94 degrees so far this afternoon. That makes a record 57 days so far this year at 90-plus degrees. The Baltimore average is 29.4 days in one calendar year, so we've nearly doubled that. Still waiting to see if we break the record high for the date.
The other prediction of note in today's forecast discussion from Sterling is that the region is in for a pretty good dose of rain next week as moisture from the Gulf of Mexico surges north just west of the Appalachians. Here's how the morning discussion puts it:
"CLOUDS WILL INCREASE SUNDAY AS [WIND] FLOW BECOMES SOUTHERLY. UPPER SHORTWAVE TROUGH [LOW] WILL DIVE OUT OF THE MIDWEST US AND CLOSE OVER THE LOWER/MID MISSISSIPI
VALLEY...ALLOW[ING] DEEP LAYER MOISTURE FROM THE GULF OF MEXICO TO SURGE
INTO THE SOUTHEAST US TOWARD THE MID-ATLANTIC.
"LIGHT PRECIP MAY BEGIN SUNDAY TO SPREAD NORTHWARD INTO THE [FORECAST AREA] OVER COOLER AIR AT SURFACE...WITH BEST CHANCES ACROSS POTOMAC HIGHLANDS...CNTRL SHENANDOAH VALLEY... WITH CLOUDS AND NORTHERLY WINDS...MAXIMA SHOULD REMAIN IN LOW 70S. INCREASINGLY MOIST TREND CONTINUES INTO SUN NIGHT.
"SURFACE LOW PRESSURE FORECASTED TO DEVELOP OVER DEEP SOUTH MONDAY AND SLOWLY TREK NORTHWARD JUST WEST OF APPALACHIANS THRU TUE. LOW LEVEL FLOW BECOMES EASTERLY FOR MID-ATLANTIC...ALLOWING FOR MOIST MARINE AIR FROM THE ATLANTIC TO POOL AGAINST APPALACHIANS. STRONG SOUTHERLY FLOW AT MID AND UPPER LEVELS WILL CREATE SIGNIFICANT DEEP LAYER MOISTURE FROM THE GULF OF MEXICO.
"PRECIP CHANCES BEST WHEN SURFACE SYSTEM IS JUST WEST OF REGION MONDAY NIGHT... SIGNIFICANT
PRECIP COULD RESULT...AND HAVE RAISED PROBABILITIES DURING THIS PERIOD. NO PLANS AT THE MOMENT TO INCLUDE HEAVY RAIN POSSIBILITY IN GRIDS...BUT IF MODELS CONTINUE CURRENT TREND...THIS INTRODUCTION MAY BE WARRANTED."