middle image: Chestnut Street Bridge
bottom image: State & Water St.
SATURDAY AND SUNDAY...SIGNIFICANT AND PROBABLY MAJOR STORM TO PASS
NEAR IDEAL TRACK WITH SFC LOW PASSING ROUGHLY ALONG A MCI-GBG-CHI
AXIS. UKMET/GFS/ECMWF SIMILAR ON TRACK EXCEPT TIMING DISCREPANCIES
DUE HOW QUICKLY SYSTEM INTENSIFIES. ECMWF IS STRONGEST WITH INTENSE
SYSTEM...GFS...VERY STRONG AND UKMET JUST STRONG. UPDATED HWO FOR
CERTAINTY OF SIGNIFICANT WINTER WEATHER WITH GREATEST RISK NW OF A
SQI TO OTM LINE. CONCERN IS COLD AIR WILL BE IN PLACE OF ARCTIC
ORIGIN FOR ICE AS STRONG WAA KICKS IN. THIS RISK SHOULD BE CLARIFIED
NEXT 24-36 HOURS. HAVE UPPED POPS TO LIKELY TO HIGH CHANCE WITH SNOW
NORTH OF HIGHWAY 30 AND A MIX SOUTH. PROBABLY A LARGE TEMP GRADIENT
WITH STORM SYSTEM FOR LATER SHIFTS TO ADDRESS OF 20 DEGREES OR MORE
AND HAVE ONLY TRENDED ATTM. INSPECTION OF ANOMALIES SHOWS 2 UPWARDS
TO NEAR 4 SIGMA.../90 TO 99 PERCENT STRENGTH/ OVER FORECAST REGION
WHICH SUPPORTS STRONG TO NEAR RECORD STRENGTH SYSTEM.