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July 13-15 storm risk


Kmlwx

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Yeah, I get that. I agree that the AFD isn't really a tool that the public consumes or a tool made for them. Color me cautious, but if you are providing forecasts, it seems like you'd want to highlight and downplay like hell. Then again, I imagine the second you mention possible tors most people stop focusing on the real threats (rain and wind). 

People love shock value ;) - That's one of the areas where social media has done this field a great disservice. False and exaggerated info is fanned out way quicker and w/o verification of accuracy. I know Ian and most folks who have been in the hobby a while hate the "tornado pictures" that are not tornadoes at all. 

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I wouldn't be surprised if SPC paints a 30% for tomorrow on a day 1 outlook. Not sure exactly what the placement would be but I think we've seen less favorable setups get a 30% for wind.

Kinda doubt it locally.. maybe for NW parts of the area. Maybe SW PA back into WV/OH/KY?

 

edit: I see OH isn't even in the slight risk so maybe I need to look closer lol.

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Kinda doubt it locally.. maybe for NW parts of the area. Maybe SW PA back into WV/OH/KY?

 

edit: I see OH isn't even in the slight risk so maybe I need to look closer lol.

If we somehow got better shear tomorrow maybe I guess. This has turned into a more run-of-the-mill event for us I suppose. Waste of such an anomalous 500mb feature. 

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If we somehow got better shear tomorrow maybe I guess. This has turned into a more run-of-the-mill event for us I suppose. Waste of such an anomalous 500mb feature. 

CIPS likes NW but then up into New England. I suppose that makes sense.  Jul 1994 still there near the top.

 

Mon

post-1615-0-99910200-1405271028_thumb.pn

 

Tue

post-1615-0-07758300-1405271033_thumb.pn

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If current models hold I'd think we get back into a svr zone for Tue.

If 12z GFS is truth then there does appear to be a small window on Tuesday where there is decent instability and bulk shear. If I had to put money on it, I would still say the best chances for Tue are further SE.

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Tonight risk from LWX AFD

 

.NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
AS OF 18Z...THE BERMUDA HIGH HAS SET UP WITH SLY FLOW ACROSS THE
AREA. DEWPOINTS HAVE RISEN A COUPLE DEGREES TO AROUND 70F SINCE
DAYBREAK. A COLD FRONT IS OVER THE MIDWEST...EXTENDING WSW FROM THE
ERN GREAT LAKES THROUGH INDIANAPOLIS. SCATTERED THUNDERSTORMS HAVE
BROKEN OUT ALONG THIS BOUNDARY. THESE WILL BE THE FOCUS OF THE MOST
SIGNIFICANT WEATHER FOR THE AREA THROUGH TONIGHT. TONIGHT IS A GOOD
OPERATIVE WORD AS THE 15Z HRRR HAS THIS ACTIVITY REACHING THE
POTOMAC HIGHLANDS AROUND 6PM AND SPREADING EAST INTO THE AREA AFTER
THAT. 6PM TO 2AM IS THE ANTICIPATED TIMEFRAME FOR THUNDERSTORMS TO
ENTER THE AREA AND REACH THE BALT-WASH METRO.
THE COLD FRONT WILL
STALL OR EVEN RETROGRADE TONIGHT. THIS WILL MAKE FOR AN ACTIVE
MONDAY.

INCREASING MOISTURE IS MAKING FOR AN UNSTABLE AFTERNOON. RAP
ESTIMATES FROM SPC MESOANALYSIS PAGE DEPICTS 1500 TO 3000 J/KG SOUTH
OF DC. THIS IS MAINLY DUE TO THE SUNSHINE THAT HAS BEEN STRONG
SOUTHEAST OF DC.
AREAS SOUTH AND SOUTHEAST SHOULD SEE SOME TSTM
DEVELOPMENT LATE THIS AFTERNOON (THOUGH THE CU FIELD CURRENTLY SEEMS
TO BE STRUGGLING TO TAKE HOLD). WITH BULK SHEAR 20 KT OR LESS THIS
WOULD BE PULSE ACTIVITY. OTHERWISE...IT IS A WAITING GAME FOR THE
OHIO ACTIVITY WHICH CONTINUES TO INCREASE SINCE 18Z.

TONIGHT...BULK SHEAR INCREASES AS THE COLD FRONT APPROACHES ALLOWING
MULTI-CELL CLUSTERS. PWATS APPROACHING 2IN WILL ALLOW FOR HEAVY
RAIN...SO A FLASH FLOOD THREAT EXISTS FOR TONIGHT. CLOUDS AND SLY

FLOW KEEP MIN TEMPS UP...GENERALLY LOW TO MID 70S.

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Monday from LWX AFD

 

.SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY/...
MONDAY AND TUESDAY...SECONDARY LOBE OF DEEP LOW NORTH OF THE GREAT
LAKES SWINGS DOWN INTO THE GREAT LAKES MONDAY...AMPLIFYING THE
TROUGH OVER THE MIDWEST STATES INTO TUESDAY. MEANWHILE THE STALLED
FRONT WILL BE THE FOCUS OF DEVELOPMENT FOR OVER 24 HRS. THERE SHOULD
BE A DIURNAL EBB AND FLOW OF ACTIVITY WITH MONDAY EVENING (ACROSS
THE CWA) AND TUESDAY AFTERNOON/EVENING (EAST OF THE BLUE RIDGE)
BEING THE MOST HIGH IMPACT TIMES. SLIGHT RISK FOR MONDAY. LOW LEVEL
SHEAR PROFILES STILL LOOK TOO WEAK TO PROVIDE A TORNADO THREAT.
HEAVY RAIN AND DAMAGING WINDS ARE THE MAIN THREATS. SPC DAY 2 UPDATE
DOES MENTION THE POTENTIAL FOR SFC LOW DEVELOPMENT ALONG THE FRONT.
THIS WOULD PROVIDE AT LEAST SOME TORNADO THREAT...SO THAT THREAT
WILL NEED TO BE FOLLOWED BY SUBSEQUENT FORECAST SHIFTS.
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New MD just to our north. Possibility of the watch being expanded further east across central/eastern PA. 

 

 

 

WOUS64 KWNS 132004

WOU4

BULLETIN - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 414

NWS STORM PREDICTION CENTER NORMAN OK

405 PM EDT SUN JUL 13 2014

SEVERE THUNDERSTORM WATCH 414 IS IN EFFECT UNTIL 1100 PM EDT

FOR THE FOLLOWING LOCATIONS

MDC001-021-043-140300-

/O.NEW.KWNS.SV.A.0414.140713T2005Z-140714T0300Z/

MD

. MARYLAND COUNTIES INCLUDED ARE

ALLEGANY FREDERICK WASHINGTON 

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DAY 1 CONVECTIVE OUTLOOK 
   NWS STORM PREDICTION CENTER NORMAN OK
   0301 PM CDT SUN JUL 13 2014

   VALID 132000Z - 141200Z

   ...THERE IS A SLGT RISK OF SVR TSTMS MID MS VALLEY INTO NY/PA...

   ...SUMMARY...
   SCATTERED THUNDERSTORMS WITH SPORADIC DAMAGING GUSTS AND ISOLATED
   HAIL ARE FORECAST FROM SOUTHEASTERN MISSOURI UP THE OHIO VALLEY AND
   INTO WESTERN OR CENTRAL NEW YORK THIS AFTERNOON.  OTHER ISOLATED
   DAMAGING GUSTS WILL BE POSSIBLE OVER OREGON...EASTERN COLORADO...AND
   PORTIONS OF THE GULF COAST.

   ADDED A SMALL AREA OF LOW SVR WIND PROBS TO PORTIONS OF THE WRN GULF
   COAST IN THE VICINITY OF THE WWD-MOVING WEAK UPPER LOW. LOCALIZED
   CLUSTERS OF TSTMS WILL HAVE SOME ENHANCED DOWNBURST POTENTIAL IN AN
   ENVIRONMENT CHARACTERIZED BY WEAK VERTICAL SHEAR...PW VALUES OF
   AROUND 2 INCHES...AND MID-LEVEL DRYING EVIDENT ON WATER VAPOR
   IMAGERY WRAPPING AROUND MID-LEVEL CIRCULATION WHICH MAY SERVE TO
   ENHANCE DOWNDRAFT STRENGTH.

   MINOR EWD ADJUSTMENTS TO THE SLIGHT RISK WERE MADE OVER PORTIONS OF
   MD/WV/PA WHERE UPSTREAM CLUSTERS OF SVR TSTMS HAVE A SOMEWHAT HIGHER
   PROBABILITY OF MOVING EWD WITH A CONTINUED THREAT FOR MAINLY
   DAMAGING WIND
S. SEE ALSO MCD 1356 FOR SHORT-TERM TRENDS ACROSS
   PORTIONS OF SRN NY AND MUCH OF PA.

   ISOLATED SVR TSTMS HAVE DEVELOPED ACROSS SERN WY...AIDED BY THE
   APPROACH OF A WEAK SHORTWAVE WITHIN NWLY FLOW ALOFT. REF MCD 1355
   FOR THE LATEST SHORT-TERM THINKING IN THIS AREA.

   OTHERWISE...ONLY MINOR ADJUSTMENT WERE MADE TO PREVIOUS OUTLOOK AND
   FORECAST REASONING REMAINS ON TRACK.

   ..BUNTING.. 07/13/2014

   .PREV DISCUSSION... /ISSUED 1128 AM CDT SUN JUL 13 2014/

   ...MID MS VALLEY INTO NY/PA...
   A LARGE UPPER LOW OVER WESTERN ONTARIO WILL CONTINUE TO BUILD
   SOUTHWARD TODAY...WITH THE PRIMARY SURFACE COLD FRONT SAGGING
   SOUTHWARD ACROSS THE GREAT LAKES REGION INTO THE OH VALLEY.  MOIST
   AND UNSTABLE CONDITIONS ARE PRESENT AHEAD OF THE FRONT FROM MO/IL
   INTO NY/PA...WHERE DEWPOINTS IN THE UPPER 60S AND 70S AND AFTERNOON
   TEMPERATURES IN THE 80S AND 90S ARE EXPECTED.  THUNDERSTORMS ARE
   EXPECTED TO DEVELOP DURING THE EARLY AFTERNOON FROM WESTERN
   PA/SOUTHERN NY INTO IND/IL ALONG/AHEAD OF THE FRONT.  THIS REGION
   WILL EXPERIENCE MID LEVEL HEIGHT FALLS AND INCREASING WINDS ALOFT
   THROUGH THE DAY...PROMOTING ORGANIZED STORMS CAPABLE OF LOCALLY
   DAMAGING WINDS AND SOME HAIL.  ACTIVITY IS EXPECTED TO SPREAD
   EASTWARD THROUGH THE DAY INTO THE WESTERN MID ATLANTIC AND OH VALLEY
   REGIONS.

   FARTHER WEST ALONG THE SURFACE BOUNDARY...CONVECTION WILL BE MORE
   ISOLATED IN NATURE FROM MO INTO KS/OK.  NEVERTHELESS...STEEP LOW
   LEVEL LAPSE RATES AND MODERATE CAPE MAY RESULT IN A FEW
   STRONG/SEVERE STORMS CAPABLE OF GUSTY/DAMAGING WINDS.

   ...EASTERN CO...
   SCATTERED THUNDERSTORMS ARE EXPECTED ONCE AGAIN TODAY OVER PARTS OF
   CENTRAL AND EASTERN CO.  A FEW OF THESE STORMS MAY BECOME ORGANIZED
   WITH A RISK OF HAIL AND GUSTY WINDS THIS AFTERNOON.

   ...AZ...
   WATER VAPOR LOOPS SHOW AN EASTERLY WAVE TRACKING ACROSS NORTHWEST
   MEXICO.  ENHANCED EASTERLY MID LEVEL WINDS ON THE NORTH SIDE OF THE
   WAVE WILL AFFECT AZ TODAY...ALONG WITH SUFFICIENT LOW/MID LEVEL
   MOISTURE FOR SCATTERED AFTERNOON THUNDERSTORMS.  IT APPEARS THAT THE
   POTENTIAL EXISTS FOR A MORE ACTIVE THUNDERSTORM DAY ALONG THE
   MOGOLLON RIM AND MOUNTAINS OF SOUTHEAST AZ.  FAVORABLE STEERING FLOW
   MAY ALLOW OUTFLOWS FROM THESE STORMS TO PROPAGATE WESTWARD INTO THE
   LOWER DESERTS THIS EVENING.  THIS SCENARIO AND CONVECTIVE TRENDS
   WILL BE CLOSELY MONITORED FOR A POSSIBLE UPGRADE TO SLIGHT RISK.
 

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Seems like decent consensus at this pt the shortwave embedded in the ULL makes its best pass around 18z tue. Perhaps we can screw up both days if we are lucky.

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