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Fall/Early Winter 2019 Forecasts and Discussion


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1 hour ago, Blizzard of 93 said:

The average high at MDT today is still 60. The record high for today is 80, which was set in 1984. The temps today were not too far out of line.

Later this week, we are going to cool off. We might not get to 50 this weekend.

First freeze for many it looks like is possible.

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2 hours ago, Bubbler86 said:

How do they deal with that if it is down pouring?  Move to another day?   In some areas of the country they only holds trick or treat on a certain day of the week regardless where Oct 31 falls.

Can't really reschedule it - and I've never understood this area that has it on a Thursday regardless if that's the 31st or not. I've never heard of that until moving here and it makes no sense to me. If you're going to have it moved for safety, make it a Sunday afternoon. 

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4 minutes ago, canderson said:

Can't really reschedule it - and I've never understood this area that has it on a Thursday regardless if that's the 31st or not. I've never heard of that until moving here and it makes no sense to me. If you're going to have it moved for safety, make it a Sunday afternoon. 

In my township they do it on Halloween regardless of day but I know a lot of other areas do it like yours does. 

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13 hours ago, Bubbler86 said:

How do they deal with that if it is down pouring?  Move to another day?   In some areas of the country they only holds trick or treat on a certain day of the week regardless where Oct 31 falls.

Most (including Tamaqua) in my area moved trick or treat to Friday or Saturday.

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Categorical Probabilistic
 Pop.  Cities  CWAs  RFCs  Interstates  Counties  ARTCC  FEMA Regions
map_background.gif day2otlk_0600.gif
Day 2 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 120,908 27,514,107 Baltimore, MD...Charlotte, NC...Washington, DC...Raleigh, NC...Greensboro, NC...
MARGINAL 125,227 20,388,350 Atlanta, GA...Birmingham, AL...Montgomery, AL...Columbus, GA...Knoxville, TN...
Categorical Day2 0600Z Outlook
 
 
 Forecast Discussion
   SPC AC 300549

   Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1249 AM CDT Wed Oct 30 2019

   Valid 311200Z - 011200Z

   ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE
   MID-ATLANTIC STATES...

   ...SUMMARY...
   Severe thunderstorms capable of strong wind gusts are possible from
   the Upper Ohio Valley into portions of the Mid-Atlantic States and
   Southeast on Thursday.

   ...Synopsis...
   A strong shortwave trough is expected to mature into a vertically
   stacked mid-latitude cyclone as it moves through the mid MS and OH
   Valleys and into eastern Ontario and the Northeast States. Very
   strong mid/upper-level flow will accompany this system, with a 100+
   kt 500-mb jet streak moving throughout its eastern periphery across
   the TN/OH Valleys and into the Northeast.

   Surface low associated with this system will likely be centered over
   the IN/OH border early Thursday with an attendant cold front
   extending south-southwestward through middle TN and central AL and
   off the central Gulf Coast. This low will occlude as it moves
   north-northeastward throughout the day. The attendant cold front
   will sweep eastward across the eastern CONUS, moving off the East
   Coast of the CONUS late Thursday night. Thunderstorms are
   anticipated along the length of this front, some which could be
   severe.

   ...Southeast into Mid-Atlantic States...
   Showers and isolated thunderstorms will likely be ongoing within the
   broad pre-frontal warm sector from the Southeast into the northern
   Mid-Atlantic. Moisture advection ahead of the front will likely
   result in low 70s dewpoints across the Southeast, upper 60s/low 70s
   across much of the Mid-Atlantic, and mid 60s as far north as PA and
   NJ. Diurnal heating will be tempered by abundant cloud cover and
   antecedent precipitation but ample low-level will still result in
   modest instability (i.e. MLCAPE 500-1000 J/kg) ahead of the front.
   Pre-frontal showers and thunderstorms are anticipated through the
   mid to late afternoon. Thereafter, the fast-moving cold front will
   likely catch up to these pre-frontal storms, leading to a
   consolidation of all the deep convection along the front. 

   The strong southwesterly flow aloft will extend across the entire
   region and a few of the pre-frontal storms may be able to organize
   enough to produce damaging wind gusts and perhaps a brief tornado.
   Once storms consolidate along the front, strong forcing for ascent
   attendant to the shortwave trough coupled with vertically veering
   wind profiles will likely lead to a narrow but well-organized
   convective line. Strong wind gusts will be the main threat within
   the line and the highest coverage of severe storms is currently
   expected across the Mid-Atlantic states, from central PA through
   western SC. A few tornadoes are possible within the line,
   particularly across the northern Mid-Atlantic where low-level flow
   will be strongest. 

   Current HREF guidance suggests the probability of any pre-frontal
   supercells across central VA and the central Carolinas is low.
   However, the environmental conditions ahead of the front during the
   late afternoon support supercell development with any persistent
   deep convection.

   ...MAXIMUM RISK BY HAZARD...
   Tornado:   5%     - Slight
   Wind:     15%     - Slight
   Hail:      5%     - Marginal

   ..Mosier.. 10/30/2019

   CLICK TO GET WUUS02 PTSDY2 PRODUCT

   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 1730Z
   CURRENT UTC TIME: 0818Z (4:18AM), RELOAD THIS PAGE TO UPDATE THE TIME
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< Day 1 Outlook   Day 3 Outlook >
 
Oct 30, 2019 1730 UTC Day 2 Convective Outlook
Updated: Wed Oct 30 17:24:17 UTC 2019 (Print Version | 20191030 1730Z Day 2 shapefile | 20191030 1730Z Day 2 KML)
Probabilistic to Categorical Outlook Conversion Table
Categorical Probabilistic
 Pop.  Cities  CWAs  RFCs  Interstates  Counties  ARTCC  FEMA Regions
map_background.gifday2otlk_1730.gif
Day 2 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
ENHANCED 56,595 17,249,616 Baltimore, MD...Washington, DC...Raleigh, NC...Greensboro, NC...Durham, NC...
SLIGHT 91,011 18,636,059 Philadelphia, PA...Charlotte, NC...Newport News, VA...Hampton, VA...Fayetteville, NC...
MARGINAL 151,977 36,655,971 New York, NY...Virginia Beach, VA...Atlanta, GA...Newark, NJ...Norfolk, VA...
Categorical Day2 0600Z Outlook
 
 
 Forecast Discussion
   SPC AC 301724

   Day 2 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   1224 PM CDT Wed Oct 30 2019

   Valid 311200Z - 011200Z

   ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS FROM PORTIONS
   OF SOUTHERN PENNSYLVANIA SOUTHWARD INTO NORTHERN NORTH CAROLINA...

   ...SUMMARY...
   Severe thunderstorms capable of strong wind gusts are expected
   across much of the eastern U.S. Thursday -- particularly from areas
   along and east of the central and southern Appalachians to the mid
   Atlantic and Carolinas coastal areas.

   ...Synopsis...
   An upper trough crossing the central U.S. at the start of the period
   will evolve into a deepening closed low with time, as the system
   shifts quickly east-northeastward across the Midwest, and then into
   the Northeast overnight.  As this occurs, the broader trough
   surrounding the low will gradually take on a more neutral to
   slightly negative tilt, through the end of the period.

   As this occurs, a cold front -- initially trailing from a low near
   the KY vicinity southward across Alabama to near the mouth of the
   Mississippi River -- will advance steadily eastward during the day. 
   The front should cross the Appalachian crest by afternoon, as the
   parent low rapidly deepens and eventually occludes over the Lower
   Great Lakes area, reaching the Atlantic coast after midnight.  This
   front will focus a band of showers and thunderstorms -- and
   attendant risk for severe weather primarily along and east of the
   mountains.

   ...Portions of the PA/NY vicinity southward/southwestward to the
   southern Appalachians...
   A zone of showers and thunderstorms should be ongoing at the start
   of the period from the mid Ohio Valley/Mid South region
   south-southwestward to the western Gulf of Mexico, in the vicinity
   of an advancing surface cold front.  A secondary area of showers --
   perhaps with some embedded lightning -- will be shifting quickly
   northeastward across the Carolinas/Virginia vicinity.  Only minimal
   severe risk -- mainly in the form of gusty winds or a brief tornado
   -- is apparent at this time within either of these areas of
   convection through the first several hours of the period.

   With time, the advance of the cold front across the southern, and
   then the central, Appalachians during the afternoon in conjunction
   with the strengthening upper system will result in gradual
   organization of a band of frontal convection.  Very strong flow
   aloft will aid in the convective organization, with upscale
   evolution toward a semi-continuous band of storms expected.  By late
   afternoon/early evening, storms will likely have become fairly
   well-organized, crossing south-central and southeastern PA, MD, VA,
   and the Carolinas along with attendant risk for strong/damaging wind
   gusts.  

   Low-level wind profiles will become supportive of supercells during
   the afternoon across the pre-frontal warm sector.  While suggestive
   of some tornado potential, pre-frontal warm-sector storms are
   largely not anticipated.  Still, a few mainly QLCS-type tornadoes
   will be possible, given the overall dynamic/kinematic set-up --
   particularly from late afternoon through mid evening.

   As storms near the coast overnight, gradual weakening of the
   convection -- and associated diminishing of the severe risk -- is
   expected, though limited wind risk will likely extend to near the
   mid Atlantic/Carolina coasts overnight.

   ...MAXIMUM RISK BY HAZARD...
   Tornado:   5%     - Slight
   Wind:     30%     - Enhanced
   Hail:      5%     - Marginal

   ..Goss.. 10/30/2019

   CLICK TO GET WUUS02 PTSDY2 PRODUCT

   NOTE: THE NEXT DAY 2 OUTLOOK IS SCHEDULED BY 0600Z
   CURRENT UTC TIME: 1859Z (2:59PM), RELOAD THIS PAGE TO UPDATE THE TIME
 
 
 
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3 hours ago, Voyager said:

Every model (globals and mesos) show the squall line with the FROPA. It should be interesting when it blows through...

yeah it was mentioned in yesterdays disco.

Sounds like CTP is in the crosshairs....cept for your house.....ya know....atmospheric memory and your Schuylkill county storm bubble :)

  • Haha 1
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