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8/21 Severe Threat - Obs/Discussion


Kmlwx

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Updated morning AFD sould be interesting

Watch it be like

"Apologies on that HWO - we just wanted to see how Yoda would react"

Also - I expect Yoda to bring his loyalties back to this thread for copying and pasting ;) - Come back from the tropics for a day.

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On a more serious note - anyone have an idea on timing? I've got a MIL who needs to drive back to the eastern shore, and I'd rather have her on the road before all hell breaks loose.

Seems like anytime from like 2 until 7 could be fair game. Wouldn't put it past mother nature to pop a few earlier ones too.

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Dont' most of these frontals typically roll through I-95 starting around 4ish?

Yeah but I'm allowing for some earlier popups ahead of the main thing. 4pm would probably be a good narrower time to zero in on. I guess also since Katie is a bit east she'd have more time.

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Yeah but I'm allowing for some earlier popups ahead of the main thing. 4pm would probably be a good narrower time to zero in on. I guess also since Katie is a bit east she'd have more time.

Thanks. I told her sometime after 2, think she is leaving around noonish.

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On a more serious note - anyone have an idea on timing? I've got a MIL who needs to drive back to the eastern shore, and I'd rather have her on the road before all hell breaks loose.

The wording of that made me chuckle. I assume you meant you want her off the roads before hell breaks loose. But then again, you are talking about a MIL, so who knows.

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The wording of that made me chuckle. I assume you meant you want her off the roads before hell breaks loose. But then again, you are talking about a MIL, so who knows.

I want her out of this area (north of Baltimore) and on her way east before hell breaks loose. I do want her to get home safely and not have to drive in anything.

I actually know nothing about weather - but I did stay at Holiday Inn Express last night so I must be an expert.

works for me :thumbsup:

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FLOOD WATCH

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1110 AM EDT SUN AUG 21 2011

DCZ001-MDZ005>007-009>011-013-014-VAZ053-054-212315-

/O.NEW.KLWX.FF.A.0013.110821T1800Z-110822T0300Z/

/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

DISTRICT OF COLUMBIA-CARROLL-NORTHERN BALTIMORE-HARFORD-

MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-

FAIRFAX-ARLINGTON/FALLS CHURCH/ALEXANDRIA-

INCLUDING THE CITIES OF...WASHINGTON...WESTMINSTER...

GAITHERSBURG...COLUMBIA...BALTIMORE...ANNAPOLIS...FAIRFAX...

ALEXANDRIA...FALLS CHURCH

1110 AM EDT SUN AUG 21 2011

...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WATCH FOR THE DISTRICT OF COLUMBIA...THE CITY OF

BALTIMORE...PORTIONS OF NORTHERN VIRGINIA AND MUCH OF

NORTHEASTERN MARYLAND.

* UNTIL 11 PM EDT THIS EVENING.

* SEVERAL ROUNDS OF THUNDERSTORMS DURING THE PAST WEEK HAVE

SATURATED SOIL IN THE WATCH AREA. ADDITIONAL HEAVY RAIN CAN BE

EXPECTED FROM THUNDERSTORMS TODAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WATCH MEANS THAT CONDITIONS THAT LEAD TO FLASH

FLOODING MAY DEVELOP. FLASH FLOODING IS A VERY DANGEROUS

SITUATION.

MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD

FLASH FLOOD WARNINGS BE ISSUED.

&&

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.NEAR TERM /THROUGH MONDAY/...

WEAK SHRTWV TROF THIS MRNG INITIATED CNVCTN IN THE BALTIMORE AREA.

THESE TSTMS CONTAINED HVY RAIN AND MODESTLY GUSTY WINDS...BUT LKLY

WERE ELEVATED. RECOVERY IS XPCD IN THE WAKE OF THIS WAVE AND AHEAD

OF THE STRONG TROF THAT WILL IMPACT THE RGN EARLY THIS AFTN.

CNVCTN OVER WV WILL CONT TO MOVE EWD THIS MRNG. WITH HEATING OF

VERY MOIST AMS OVER FCST AREA...THIS CLUSTER OF SHWRS AND TSTMS

WILL MOVE INTO INCRGLY UNSTABLE ENVIRONMENT. UPSWING IN INTENSITY

AND CVRG OF CNVCTN XPCD BY EARLY AFTN AS SFC TROF SHARPENS AND AMS

CONTS TO DESTABILIZE.

MODIFIED KIAD 12Z SOUNDING CONTAINS 3000 J/KG CAPE WITH MEAGER

INHIBITION. AS FORCING FOR ASCENT INCRS AHEAD OF APRCHG TROF AND

MID-LVL JET NEARS...CNVCTN SHUD BLOSSOM EASILY. AS DP-LYR SHEAR

INCRS...UPDRAFTS SHUD BCM INCRGLY ORGANIZED...FAVORING BOTH

CELLULAR AND LINEAR MODES. SUPERCELLS AND BOWING LINEAR STRUCTURES

CAN BE XPCD.

SGFNT SVR WIND EVENT WILL BE PSBL AS WET DOWNBURSTS COULD REACH

VELOCITIES IN EXCESS OF 80 MPH SPCLY E OF BLUE RDG MTNS. DRY LYR

ALOFT NOTED ON WATER VAPOR SATELLITE IMAGES ALSO WILL ENHANCE A

HAIL THREAT GIVEN THE POTENT UPDRAFTS XPCD.

LOW-LVL JET WILL STRENGTHEN THIS AFTN IN INTERSTATE 95 CORRIDOR

AHEAD OF APRCHG TROF AXIS. ALL MODELS INDICATE DVLPMT OF WEAK SFC

LOPRES ALONG THE LEE TROF AXIS...WHICH WILL FURTHER BROADEN THE

LOW-LVL HODOGRAPHS. WITH RESIDUAL OUTFLOW FROM MRNG CNVCTN AND

FAVORABLE LOW-LVL WIND FIELDS...ISOLD TORNADOES WILL BE PSBL IN

THE MOST INTENSE TSTMS...SPCLY IN NERN MD.

ALTHOUGH TSTMS WILL BE MOVG QUICKLY...THE MOST SGFNT RAINFALL IS

XPCD IN AREAS THAT HAVE BEEN IMPACTED BY SVRL ROUNDS OF RECENT

INTENSE TSTMS. AS A RESULT...FLASH FLOOD GUIDANCE IS LOW. FLASH

FLOOD WATCH HAS BEEN ISSUED FOR THIS AFTN AND EVE.

CDFNT WILL MOVE ACRS RGN THIS EVE AND LKLY WILL BE ACCOMPANIED BY

SHWRS AND TSTMS. SVR WX THREAT WITH THESE TSTMS MAY BE LESSER

OWING TO WORKED-OVER ATMOSPHERE FROM THIS AFTN. BUT IT CANNOT BE

SAID WITH CONFIDENCE THAT A SECOND ROUND OF SVR WX IS NOT PSBL

THIS EVE.

RAPID DECR IN PCPN XPCD BEHIND THE CDFNT...BUT CLD CVR MAY LINGER

THRU MUCH OF TNGT. LOW LVLS WILL DRY OUT AS CDFNT CROSSES...WHICH

MAY HELP MINIMA TO FALL LWR THAN THEY OTHERWISE MIGHT IN SUCH CLDY

CONDS.

&&

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