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Lee's Remnants and the Mid-Atlantic


WxUSAF

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6.83" over the last 3 days ending midnight at BWI, then another 1.86" through 10AM

10.38" at BWI in AUG and 8.69" for SEPT

you won't find back-to-back double digit precip totals at BWI (or at Baltimore before BWI) for those 2 months in the records, and I would hardly be going out on a limb by saying BWI will surpass 10" for SEPT, so it looks like we're in record territory fwiw

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6.83" over the last 3 days ending midnight at BWI, then another 1.86" through 10AM

10.38" at BWI in AUG and 8.69" for SEPT

you won't find back-to-back double digit precip totals at BWI (or at Baltimore before BWI) for those 2 months in the records, and I would hardly be going out on a limb by saying BWI will surpass 10" for SEPT, so it looks like we're in record territory fwiw

If those numbers are correct, it is already the greatest two-month period (whole months) on record. Previous was 19.04" in Aug/Sept 1934. The blockbuster August 1955 (18.35") was surrounded by 0.30" and 0.56" on each side.

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6.83" over the last 3 days ending midnight at BWI, then another 1.86" through 10AM

10.38" at BWI in AUG and 8.69" for SEPT

you won't find back-to-back double digit precip totals at BWI (or at Baltimore before BWI) for those 2 months in the records, and I would hardly be going out on a limb by saying BWI will surpass 10" for SEPT, so it looks like we're in record territory fwiw

=========================

More stats -- someone can update this tomorrow with today's data:

Sep 5,6, 7 Rainfall Totals:

BWI: 1.43, 1.84, 3.40 = 6.67"

DCA: 1.36 0.90, 2.82 = 5.08"

IAD: 1.09, 1.17, 1.11 = 3.37"

HGR: 1.07, 1.21, 0.57 = 2.85" (but also 1.08 on 9/4)

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If those numbers are correct, it is already the greatest two-month period (whole months) on record. Previous was 19.04" in Aug/Sept 1934. The blockbuster August 1955 (18.35") was surrounded by 0.30" and 0.56" on each side.

well, I got them off of LWX site preliminary climate data and the hourly data here: http://www.srh.noaa.gov/data/obhistory/KBWI.html

and yeah, I thought that it might be possible about the 2 month record, but I didn't take the time to confirm it

to me, record or not, it doesn't mean much if it doesn't help us this winter! :weenie:

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=========================

More stats -- someone can update this tomorrow with today's data:

Sep 5,6, 7 Rainfall Totals:

BWI: 1.43, 1.84, 3.40 = 6.67"

DCA: 1.36 0.90, 2.82 = 5.08"

IAD: 1.09, 1.17, 1.11 = 3.37"

HGR: 1.07, 1.21, 0.57 = 2.85" (but also 1.08 on 9/4)

you're right, I included the .16" that fell on the 2nd & 3rd

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Clarksburg, MD Obs:

04 Sept: 0.53"

05 Sept: 0.93"

06 Sept: 1.72"

07 Sept: 0.95" (so far at 5pm)

Running Total: 4.13"

Model estimate (with forecaster input) at 4pm update on Sunday from LWX for the front/remnants was 5.61" thru Saturday. I'm always so very impressed at how they do with anomalous events like this.

Updated Clarksburg, MD Obs:

04 Sept: 0.53"

05 Sept: 0.93"

06 Sept: 1.72"

07 Sept: 1.68"

08 Sept: 0.29" (so far at 11am)

Running Total: 5.15"

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Went out to the Northwest Branch a few minutes ago to get some pics - lots of standing water in the woods but no significant flooding. However, we are just about at bankfull - the water in the picture below is normally not covering the plants that have been inundated. Pretty high levels.

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Well, from the history of this event, the east side of the "column" always got the best action. It looks like a column is setting up to the west of D.C. Will history prove correct? :popcorn:

im not sure "history" means anything other than that if you're just east of the warm front you probably have a better shot at heavier convective rain.

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AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1004 AM EDT THU SEP 8 2011

.NEAR TERM /THROUGH TONIGHT/...

-- Changed Discussion --UPPER LOW CONTINUES TO SPIN OVER THE OHIO VALLEY...WITH A DEEP

FEED OF MOISTURE REMAINING ACROSS THE MID ATLANTIC. THERE WAS

ALSO A LINGERING LOW LEVEL BOUNDARY NEAR THE CHESAPEAKE BAY.

ONGOING SHOWERS AND ISOLATED THUNDERSTORMS WILL CONTINUE THROUGH

MIDDAY ACROSS THE BULK OF THE WASHINGTON-BALTIMORE METRO AREA

WHILE AREAS WEST OF THERE GENERALLY REMAIN DRY BUT WITH SOME FOG

AND/OR DRIZZLE.

EXPECT ADDITIONAL DEVELOPMENT THIS AFTERNOON...HOWEVER GUIDANCE

SUGGESTS THAT THE AXIS MAY SHIFT A LITTLE MORE TO THE

WEST/NORTHWEST AND POPS REFLECT THIS EXPECTED CHANGE.

FLASH FLOOD WATCH WILL REMAIN IN EFFECT. WITH HIGH PRECIPITABLE

WATERS AND POTENTIAL FOR TRAINING AS WELL /NOT TO MENTION LOW FFG/

HEAVY RAINFALL AND FLASH FLOODING WILL REMAIN A THREAT.

SEVERE/TORNADO THREAT HAS LESSENED FROM THE LAST COUPLE OF

DAYS...HOWEVER WITH LOW LEVEL BOUNDARY NEAR THE BAY AND SOME

SHEAR...STILL CANT RULE OUT AN ISOLATED TORNADO IN ANY

THUNDERSTORM THAT DEVELOPS.

UPPER LOW REMAINS OVER THE OHIO VALLEY TONIGHT. EXPECT MORE

SHOWERS TO AFFECT THE CWA TONIGHT...AGAIN WITH A SLIGHTLY WESTWARD

SHIFT COMPARED TO WHAT/S ON THE RADAR THIS MORNING.-- End Changed Discussion --

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FDK stopped recording rain totals, but the closest wxbug station in Frederick is reporting 4.41" so far this month with another 0.61 so far today, pushing us over the 5" mark

I got 0.40" since 8:00 this morning which puts me at 3.65" since Saturday night. I don't remember if it rained last Thursday or Friday which would add to my total.

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