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Hurricane Agnes

E PA/NJ/DE Spring 2020 OBS Thread

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Boomer at 4am was nice. Great to see the cold wave this weekend has moderated and the forecast mid month chill has been reduced to only slightly below normal.

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35 minutes ago, RedSky said:

Boomer at 4am was nice. Great to see the cold wave this weekend has moderated and the forecast mid month chill has been reduced to only slightly below normal.

If correct, I don't see that as good news at all. Keep it cool for as long as possible. It's only early April and we know we'll get blow torched/ above normal at some point till/through Sept....no need to rush it.  

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repetitive GFS model  runs in the last few days  indicate wet snow possible next weekend  18-19th time frame. I know there is a cold bias with the GFS but with a deep cold pool LP sitting near us, I cannot discount a "tulip snowfall event" from happening.  It would be real ironic that the heaviest snowfall in three months occurs after Easter. Expect the unexpected.

 

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3 hours ago, Rtd208 said:

Mesos look blah but I would put more credence in the SPC outlook than a computer generated model so yeah. Looks like 2 rounds of convection in SE PA.....first around lunchtime then another later this afternoon. Might even see a brief instability snow or hail squall early tomorrow North of the turnpike.

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3 hours ago, Ralph Wiggum said:

Mesos look blah but I would put more credence in the SPC outlook than a computer generated model so yeah. Looks like 2 rounds of convection in SE PA.....first around lunchtime then another later this afternoon. Might even see a brief instability snow or hail squall early tomorrow North of the turnpike.

 

Instability and shear ahead of the front are plentiful (plenty of sun now too - up to 63F already with a 59 dew), and precip on the front is more organized now than the models predict.  

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SPC lofted a Severe Thunderstorm Watch for the area -

Quote

Severe Thunderstorm Watch

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 96
NWS STORM PREDICTION CENTER NORMAN OK
1200 PM EDT THU APR 9 2020

SEVERE THUNDERSTORM WATCH 96 IS IN EFFECT UNTIL 400 PM EDT
FOR THE FOLLOWING LOCATIONS

PAC017-029-045-091-101-092000-
/O.NEW.KWNS.SV.A.0096.200409T1600Z-200409T2000Z/

PA
.    PENNSYLVANIA COUNTIES INCLUDED ARE

BUCKS                CHESTER             DELAWARE
MONTGOMERY           PHILADELPHIA
$$


 

20200409-nws-windadv-severethunderstormwatch-phi-severethunderstormwarning-windadv-severethunderstormwatch-phiarea.PNG

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Severe Thunderstorm Warning lofted for N/W of Philly metro -

Quote

Severe Thunderstorm Warning

Severe Thunderstorm Warning
PAC011-017-029-077-091-091715-
/O.NEW.KPHI.SV.W.0016.200409T1623Z-200409T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1223 PM EDT Thu Apr 9 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Berks County in eastern Pennsylvania...
  South central Lehigh County in eastern Pennsylvania...
  Montgomery County in southeastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...

* Until 115 PM EDT.

* At 1222 PM EDT, severe thunderstorms were located along a line
  extending from Laureldale to near Adamstown to near Strasburg,
  moving east at 55 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is
           possible.

* Locations impacted include...
  Reading, West Chester, Norristown, Pottstown, Phoenixville,
  Lansdale, West Norriton, East Norriton, Coatesville, Wyomissing,
  Quakertown, Perkasie, Downingtown, Souderton, Bedminster,
  Birdsboro, Collegeville, Royersford, Fleetwood and Chalfont.

This includes the following highways...
 Pennsylvania Turnpike between exits 298 and 326.
 Northeast Extension between exits A31 and A44.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.
 Interstate 76 in Pennsylvania near mile marker 327.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

&&

LAT...LON 4044 7597 4050 7510 4021 7526 3991 7558
      3994 7598 3994 7599 3995 7600 4004 7593
      4011 7594 4014 7588 4026 7607
TIME...MOT...LOC 1622Z 266DEG 49KT 4039 7592 4023 7601 4003 7621

HAIL...0.75IN
WIND...60MPH

$$

MPS

 

20200409-nws-windadv-severethunderstormwatch-phi-severethunderstormwarning-windadv-severethunderstormwatch-phiarea1.PNG

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Gust front brought a two big pines down across my road and in neighbors backyard. Got it on video as I was filming the front roll in I'll try to upload it to youtube it had some good lightning, thunder and swearing in it too.

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Man, this narrow line is moving! Winds have increase along w/large drops. Should get the main line in 15 - 20mins...

*Hurricane Agnes, using GRLevel3...very nice.

 

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Warning issued further east to Philly metro -

Quote

Severe Thunderstorm Warning

Severe Thunderstorm Warning
NJC019-021-023-027-035-041-PAC017-029-045-091-101-091745-
/O.NEW.KPHI.SV.W.0019.200409T1700Z-200409T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
100 PM EDT Thu Apr 9 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southern Morris County in northern New Jersey...
  Hunterdon County in northwestern New Jersey...
  South central Warren County in northwestern New Jersey...
  Northwestern Mercer County in central New Jersey...
  Somerset County in northern New Jersey...
  Northwestern Middlesex County in northern New Jersey...
  Montgomery County in southeastern Pennsylvania...
  Bucks County in southeastern Pennsylvania...
  Northeastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 145 PM EDT.

* At 100 PM EDT, severe thunderstorms were located along a line
  extending from near Bloomsbury to near Fricks to Marshallton,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is
           possible.

* Locations impacted include...
  Philadelphia, Trenton, West Chester, Somerville, Bensalem,
  Bridgewater, Ewing, Norristown, Chester, Phoenixville, Lansdale,
  West Norriton, Middlesex, East Norriton, Princeton, Yeadon,
  Westtown, Bound Brook, Manville and Perkasie.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Interstate 287 in New Jersey between mile markers 8 and 27.
 Interstate 295 in New Jersey between mile markers 68 and 76.
 Interstate 78 in New Jersey between mile markers 7 and 43.
 Interstate 95 in Pennsylvania between mile markers 6 and 10.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 320 and 353.
 Northeast Extension between exits A20 and A31.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in Pennsylvania between mile markers 327 and 347.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Mount Holly NJ.

&&

LAT...LON 4060 7445 4059 7445 4032 7464 3985 7530
      3991 7580 4033 7535 4070 7507 4070 7443
      4067 7446 4066 7445 4067 7443 4066 7441
TIME...MOT...LOC 1700Z 268DEG 40KT 4062 7506 4033 7527 3997 7566

HAIL...0.75IN
WIND...60MPH

$$

MPS


 

20200409-nws-windadv-severethunderstormwatch-phi-severethunderstormwarning-windadv-severethunderstormwatch-phiarea2.PNG

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Sortof meh.  Didn't see any lightning although heard a distant thunder earlier.  The line broke up around the hills here but can hear a roar to the east of me.  The temp is dropping and you can feel to cool air coming in.  Temp down to 65 and dropping with some rain.

ETA, temp down to 64 and continuing to drop.

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Updated Warning (temp here down to 62) -

Quote

Severe Thunderstorm Warning

Severe Thunderstorm Warning
PAC011-017-029-045-091-101-091815-
/O.NEW.KPHI.SV.W.0022.200409T1726Z-200409T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
126 PM EDT Thu Apr 9 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Berks County in eastern Pennsylvania...
  Montgomery County in southeastern Pennsylvania...
  South central Bucks County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Western Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 215 PM EDT.

* At 125 PM EDT, a severe thunderstorm was located over Glenmoore, or
  12 miles northwest of West Chester, moving east at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is
           possible.

* Locations impacted include...
  Philadelphia, West Chester, Norristown, Chester, Pottstown,
  Phoenixville, Lansdale, West Norriton, East Norriton, Coatesville,
  Yeadon, Westtown, Downingtown, Conshohocken, Hatboro, Folcroft,
  Ambler, Swarthmore, Birdsboro and Collegeville.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Interstate 95 in Pennsylvania between mile markers 7 and 16, and
near mile marker 22.
 Interstate 476 in Pennsylvania between mile markers 0 and 19.
 Pennsylvania Turnpike between exits 298 and 343.
 Northeast Extension between exits A20 and A31.
 Interstate 676 in Pennsylvania between mile markers 0 and 1.
 Interstate 76 in Pennsylvania between mile markers 327 and 350.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4004 7593 4009 7594 4012 7593 4014 7588
      4016 7590 4026 7585 4026 7499 3988 7518
      3985 7526 3995 7600
TIME...MOT...LOC 1725Z 276DEG 46KT 4011 7576

HAIL...<.75IN
WIND...60MPH

$$

SFJ

 

20200409-nws-windadv-severethunderstormwatch-phi-severethunderstormwarning-windadv-severethunderstormwatch-phiarea3.PNG

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Just now, Birds~69 said:

Pretty much a 3-4 min blast then done. Brighter skies as I type...

Now peaks of sun...just like that.

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