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2023 Mid-Atlantic Severe Wx Thread (General Discussion)


Kmlwx
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3 minutes ago, Eskimo Joe said:

Latest HRRR hammers Frederick, Carroll, Baltimore counties. Several UHI tracks. DC seems more like run of the mill line of storms.

thanks. just emailed my health/safety guy at work to give him the heads up. and spoke with my boss at the studio to make sure we had a shelter in place plan. 

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ZCZC SPCPWOSPC ALL
   WOUS40 KWNS 071302
   DCZ000-DEZ000-GAZ000-KYZ000-MDZ000-NCZ000-PAZ000-SCZ000-TNZ000-VAZ000-WVZ000-071800-

   PUBLIC SEVERE WEATHER OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0802 AM CDT MON AUG 07 2023

   ...Severe thunderstorms expected over parts of the eastern U.S.
   today...

   * LOCATIONS...
     Virginia
     Central and southern West Virginia
     Maryland
     Eastern Tennessee
     Eastern Kentucky
     Southeast Pennsylvania
     Western and central North Carolina
     District of Columbia
     Western South Carolina
     Northern Georgia
     Delaware

   * HAZARDS...
     Widespread damaging winds, some hurricane force
     A few tornadoes
     Isolated large hail up to baseball size

   * SUMMARY...
     A severe weather outbreak is possible across parts of the
     eastern U.S. today with widespread damaging winds, locally
     destructive, and isolated tornadoes as the greatest threats from
     the southern and central Appalachians to the Mid-Atlantic
     States.

   Preparedness actions...

   Review your severe weather safety procedures for the possibility
   of dangerous weather today. Stay tuned to NOAA Weather Radio,
   weather.gov, or other media for watches and warnings. A watch
   means that conditions are favorable for severe thunderstorms
   over the next several hours. If a severe thunderstorm warning is
   issued for your area, move to a place of safety, ideally in an 
   interior room on the lowest floor of a sturdy building.

   &&

   ..Grams.. 08/07/2023
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9am obs out towards the i81 corridor 

.SHENANDOAH VALLEY...

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
MARTINSBURG    MOSUNNY   74  69  85 SW10G17   29.86S
HAGERSTOWN APT MOSUNNY   75  69  81 S9        29.87S
STAUNTON*      SUNNY     74  70  85 S7        29.94F
WINCHESTER*    MOSUNNY   73  68  83 SW9       29.87S
LURAY*         SUNNY     73  68  83 SW6       29.89F
NEW MARKET*    SUNNY     76  73  91 SW8       29.90S
WAYNESBORO*    SUNNY     74  69  86 CALM      29.94F

...APPALACHIANS...

CITY           SKY/WX    TMP DP  RH WIND       PRES   REMARKS
PETERSBURG WV* SUNNY     82  72  69 S8        29.87F
CUMBERLAND*    MOSUNNY   76  71  87 S3        29.90F
OAKLAND*       PTSUNNY   68  68 100 SW8G16    29.95F
HOT SPRINGS*   CLOUDY    70  70 100 SW13      30.06F
ELKINS         MOSUNNY   73  69  87 CALM      29.92F
BEDFORD PA*    PTSUNNY   72  72  98 CALM      29.87S
JOHNSTOWN      PTSUNNY   72  70  94 SW8       29.91R
ALTOONA        MOSUNNY   73  70  90 S7        29.88S
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Has there ever been HIGH RISK for this area?

I recall back in 1998 there was an outbreak with large hail and a tornado in Carroll County.  Here we did reach severe with hail.  I remember from watching the Weather Channel when their maps were orange and red where red was essentially slight risk and when it was worse it would be a lighter, salmon color and it read greatest risk.  Assuming that would be MOD or higher.  There was no ENHANCED then.

It's been quite dark here, but it's getting noticeably brighter now.

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Just now, Stormfly said:

Has there ever been HIGH RISK for this area?

I recall back in 1998 there was an outbreak with large hail and a tornado in Carroll County.  Here we did reach severe with hail.  I remember from watching the Weather Channel when their maps were orange and red where red was essentially slight risk and when it was worse it would be a lighter, salmon color and it read greatest risk.  Assuming that would be MOD or higher.  There was no ENHANCED then.

No there hasn’t 

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2 minutes ago, TSSN+ said:

Skies clearing in Westminster. Can see blue skies above low cloud deck but it’s burning off with partly sunny conditions. 

00z HREF from SPC was big to focus on a lack of mid and upper level cloud deck. That's often a hinderance for our bigger sever weather days. If we can just clear this low level junk out we should be golden.

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1 minute ago, Stormfly said:

Has there ever been HIGH RISK for this area?

I recall back in 1998 there was an outbreak with large hail and a tornado in Carroll County.  Here we did reach severe with hail.  I remember from watching the Weather Channel when their maps were orange and red where red was essentially slight risk and when it was worse it would be a lighter, salmon color and it read greatest risk.  Assuming that would be MOD or higher.  There was no ENHANCED then.

It's been quite dark here, but it's getting noticeably brighter now.

There has never been a High Risk for our area and I don't see how one would be needed today.

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1 minute ago, Eskimo Joe said:

00z HREF from SPC was big to focus on a lack of mid and upper level cloud deck. That's often a hinderance for our bigger sever weather days. If we can just clear this low level junk out we should be golden.

Looking at the satellite looks like line of clearing crossing 81 

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1 minute ago, DDweatherman said:

Regular 60% wind doesn’t even get a HIGH risk, though when would there ever be a 60% without having a hatched area. Hard to think we’d ever seen one outside a long tracking derecho 

Yup. SPC high risk days seem to be focused on tornadoes, and that's fine. I still think the 2012 Derecho should've been a hatched 60%.

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Just now, Eskimo Joe said:

Yup. SPC high risk days seem to be focused on tornadoes, and that's fine. I still think the 2012 Derecho should've been a hatched 60%.

Agreed - though it seemed like it was super "on the fly" in terms of how the upgrade happened. Wonder if that played a role - and up until the bitter end it seemed like there was low confidence in the intense strength being maintained this far east. 

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1 minute ago, Kmlwx said:

Agreed - though it seemed like it was super "on the fly" in terms of how the upgrade happened. Wonder if that played a role - and up until the bitter end it seemed like there was low confidence in the intense strength being maintained this far east. 

Two issues for that day:

1.) I don't think the EML was properly diagnosed until the 18z RAOB from ILN and the 00z soundings from LWX and PBZ came out.

2.) CAMS were still a work in progress and were all over the board. The CAMS that had the EML right blew the derecho through DC.

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4 minutes ago, Eskimo Joe said:

Yup. SPC high risk days seem to be focused on tornadoes, and that's fine. I still think the 2012 Derecho should've been a hatched 60%.

We started that day in no risk/TSTM if I remember right? Even the 8/10/20 derecho in iowa was MDT, should have been high clearly due to the nature of incredibly intense reports. 

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Just now, DDweatherman said:

We started that day in no risk/TSTM if I remember right? Even the 8/10/20 derecho in iowa was MDT, should have been high clearly due to the nature of incredibly intense reports. 

Yes. Here's the event from the SPC archive: https://www.spc.noaa.gov/exper/archive/event.php?date=20120629

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I am angling to get out of work early...hope we don't start seeing radar blowing up too early. Because getting out prior to 3:30 is looking like a losing battle...unless by some miracle my firm decides to be lenient with liberal leave or something. I've messaged as best as I could to the powers that be (I'm the company weather person lol)

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