Tuesday, October 09, 2007
DC Hits the Trifecta: 90 Degrees Probable Again
Matt Ross @ 8:40 AM
After another oppressive, record setting day, we will begin the transition to seasonably cool weather during mid week. But before the cooler weather gets here in earnest for the weekend, records today are again in serious jeopardy at all 3 airports (IAD: 87, DCA: 90, BWI: 91). The last time we had 3 straight 90 degree days in October was October 5-7, 1941 (96,94,94).
Partly Cloudy, Hot and Humid. We will likely hit 90 for the 3rd straight day, although a late day cold front will finally put an end to our summer-like pattern. It will be sunny with highs again in the low 90s across the metro area with noticeable humidity. The frontal passage late in the day will bring with it a 25% chance of showers or a thunderstorm. Tonight will be partly cloudy and mild. Precipitation chances go up to 40% with overnight lows in the low to mid 60s.
Becoming Clear, Cooler. Wednesday will still be warmer than normal, but the signs that the pattern is under transition will be evident. Look for increasingly sunny skies with a dry northwest flow. Afternoon highs will be in the low 80s. Refer to Dan's forecast for the rest of the week and weekend.
Image above depicts the extreme heat anomalies in the east. After today DC will be running over 12 degrees above normal for the month. Courtesy of MDA.
Although the extent of this early October heat is rare, it is not unprecedented. While we have never seen a 90 degree day in DC after October 11th, the chance at 80 is still there into mid November. And to think that 28 years ago tomorrow we received 0.3" of snow, our earliest measurable snowfall on record. Read more below on the current heat wave courtesy of our local National Weather Service office in Sterling, VA.
IT IS UNUSUAL FOR DAYTIME HIGH TEMPERATURES TO REACH 90F DEG OR
BETTER DURING OCTOBER IN THE MID ATLANTIC REGION.
FOR WASHINGTON DC...
AT WASHINGTON DC SINCE 1872 THERE HAVE BEEN 23 OCCURRENCES OF 90F OR
BETTER. USUALLY ONLY ONE DAY DURING THE MONTH BREAKS 90F. SEVERAL
YEARS HAD MULTIPLE OCCURRENCES...1919(3)...1939(2)...AND 1941(5).
THE WARMEST 1ST WEEK (1ST-7TH) OF OCTOBER IN WASHINGTON WAS 1941
WHEN THE AVERAGE TEMPERATURE WAS 80.0F. THIS YEAR...2007...THE FIRST
WEEK OF OCTOBER RANKED 3RD WARMEST AT 74.1F WHICH IS CLOSE TO THE
NORMAL AVERAGE TEMPERATURE EXPECTED DURING THE FIRST WEEK OF
SEPTEMBER.
IN WASHINGTON DC...THE WARMEST OCTOBER WAS 1984 WITH AN AVERAGE
TEMPERATURES OF 65.1F. OCTOBER 1941 RANKED 3RD WARMEST AT 64.5F.
Today and Tonight
Partly Cloudy, Hot and Humid. We will likely hit 90 for the 3rd straight day, although a late day cold front will finally put an end to our summer-like pattern. It will be sunny with highs again in the low 90s across the metro area with noticeable humidity. The frontal passage late in the day will bring with it a 25% chance of showers or a thunderstorm. Tonight will be partly cloudy and mild. Precipitation chances go up to 40% with overnight lows in the low to mid 60s.Tomorrow
Becoming Clear, Cooler. Wednesday will still be warmer than normal, but the signs that the pattern is under transition will be evident. Look for increasingly sunny skies with a dry northwest flow. Afternoon highs will be in the low 80s. Refer to Dan's forecast for the rest of the week and weekend. Image above depicts the extreme heat anomalies in the east. After today DC will be running over 12 degrees above normal for the month. Courtesy of MDA.
October Heat
Although the extent of this early October heat is rare, it is not unprecedented. While we have never seen a 90 degree day in DC after October 11th, the chance at 80 is still there into mid November. And to think that 28 years ago tomorrow we received 0.3" of snow, our earliest measurable snowfall on record. Read more below on the current heat wave courtesy of our local National Weather Service office in Sterling, VA.
IT IS UNUSUAL FOR DAYTIME HIGH TEMPERATURES TO REACH 90F DEG OR
BETTER DURING OCTOBER IN THE MID ATLANTIC REGION.
FOR WASHINGTON DC...
AT WASHINGTON DC SINCE 1872 THERE HAVE BEEN 23 OCCURRENCES OF 90F OR
BETTER. USUALLY ONLY ONE DAY DURING THE MONTH BREAKS 90F. SEVERAL
YEARS HAD MULTIPLE OCCURRENCES...1919(3)...1939(2)...AND 1941(5).
THE WARMEST 1ST WEEK (1ST-7TH) OF OCTOBER IN WASHINGTON WAS 1941
WHEN THE AVERAGE TEMPERATURE WAS 80.0F. THIS YEAR...2007...THE FIRST
WEEK OF OCTOBER RANKED 3RD WARMEST AT 74.1F WHICH IS CLOSE TO THE
NORMAL AVERAGE TEMPERATURE EXPECTED DURING THE FIRST WEEK OF
SEPTEMBER.
IN WASHINGTON DC...THE WARMEST OCTOBER WAS 1984 WITH AN AVERAGE
TEMPERATURES OF 65.1F. OCTOBER 1941 RANKED 3RD WARMEST AT 64.5F.
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