Jump to content
  • Member Statistics

    17,605
    Total Members
    7,904
    Most Online
    ArlyDude
    Newest Member
    ArlyDude
    Joined

PHL CWA JAN 26/27 OBS and Discussion Thread


Recommended Posts

  • Replies 1k
  • Created
  • Last Reply

.NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...

-- Changed Discussion --BASED ON THE 00Z SOUNDINGS AND SURFACE OBSERVATIONS, PCPN ITSELF IS

LAGGING THE FASTER MODEL SOLUTIONS, LEANING TOWARD A ECMWF AND

WRF-NMM COMPROMISE VERIFYING THE BEST AS OF 00Z. THE 18Z GFS .01

ISOHYET WAS ABOUT 75 MILES TOO FAR TO THE NORTH, ITS 0.10 ISOHYET

WAS VERIFYING BETTER FOR THE START OF THE MEASURABLE.

WE ALSO SUSPECTED THE GULF COAST CONVECTION WOULD CAUSE SOME

MODELING PROBLEMS AND THE SFC LOW VERIFIED MUCH FARTHER NORTH (IN

ALABAMA) THAN MOST OF THE MODELS HAD, CAN GGEM AND ECMWF VERIFYING

THE BEST THERE.

AS FOR THE 500MB PATTERN, THE TROF IS NOT AS SHARP AS MODELED,

ESPECIALLY ON THE EASTERN FLANK WHERE HEIGHTS ARE 10-20M LOWER.

THE RIDGING THEN TOWARD US WAS PRETTY CLOSE. THE POSITIONING OF

THE CLOSED LOW WAS SPOT ON.

THE 850MB AND 925MB TEMP 12HR FORECASTS ARE VERIFYING ABOUT HALF A

DEGREE TO DEGREE CELSIUS TOO LOW, WITH THE NAM HAVING THE LION`S

SHARE OF THE COLD ERRORS. ECMWF WAS CLOSEST.

IN THE SHORTER TERM, GIVEN THE LAG, WE SLOWED THE ARRIVAL OF PCPN

DOWN FOR THE OVERNIGHT. THE LATEST GFS FORECAST SOUNDINGS SUGGEST

MORE OF A SNOW OR SLEET TO RAIN PTYPE AT THE ONSET OF THE

PRECIPITATION IN THE SOUTHEASTERN PART OF OUR CWA WITH LESS OF A

FREEZING RAIN THREAT. TEMPS HAVE DROPPED WITH THE THINNER CLOUDS

THIS EVENING AND WE`LL HAVE TO SEE IF THEY RESPOND BACK UPWARD

ONCE THE CLOUDS THICKEN.

AS FOR THE REST OF THE FORECAST THE WEAKER TROF MAY BE ABLE TO

COMPENSATE FOR THE NORTHERN DISPLACEMENT OF THE LOW AS THE TURN WE

WOULD INFER WOULD BE MORE GRADUAL. THE THERMAL FIELD VERIFYING

SLIGHTLY WARMER WILL GIVE US PAUSE TO SEE IF THE 00Z MODEL SUITE

CHANGES MUCH IN MAKING THE FINAL ADVISORY/WARNING DECISION.-- End Changed Discussion --

http://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=AFD&format=CI&version=1&glossary=1&highlight=off

Link to comment
Share on other sites

30

Convective feedback due to that flare up well offshore? seems to want to split the difference with surface low. Should be two lows, yes?

Yeah... not sure we're going to see the low bomb off the jersey coastline if this verifies. Looks like it's quickly shuttling east between 24-30.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

Guest
This topic is now closed to further replies.
  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...