textproduct: State College

WHAT HAS CHANGED

* Kept adjusting sky cover due to much more moisture in llvls than anticipated. It has also kept temps down 1-2F. * Decreased Max Temps on Wed-Thurs-Fri by 1-2F

KEY MESSAGES

1) Heat risk late week 2) Increased chcs for rain/possible drought relief

DISCUSSION

KEY MESSAGE 1: Heat risk late week

Heat risk seems to have plateaued and perhaps is on the way down. Reasons against widespread heat advisory-level numbers are the anticipated clouds and ocnl rain/thunderstorms. These would serve to keep temps down. Consensus among most of our neighboring offices was to nudge the temps down a little. But, dewpoints may rise a little to balance, and come up with HI/AppT numbers close to what we have running. In any case, the changes did not remove all the risk. We may just want to tone-down the message a little due to the recent trends in clouds/precip chcs.

KEY MESSAGE 2: Increased chcs for rain/possible drought relief

The ridge overhead will be broken down quickly by energy and moisture coming from the west. We may have 4-5 straight days (starting late tomorrow/Tues) when some locations in Central PA could have rain each day. That would be mostly-welcome news for the region. The long-term drought conditions in the S/E could then be improved, and any higher-than-nil fire danger risk (currently only in the NW/ANF) could also be helped to become better.

Despite the multiple days of rain chcs and thunder, SPC has the next 5 days in only the "general thunder" category (and outside mentionable worry-levels for days 4-5). Friday does look like a pretty good chc for strong to severe storms as good height falls with the advance of a strong upper low/trough are in store.

AVIATION /18Z MONDAY THROUGH SATURDAY/

VFR-MVFR stratocumulus deck this afternoon will continue to slowly mix out & scatter, with VFR favored regionwide by 21Z-23Z Monday as the boundary layer decouples. Otherwise, winds will continue to trending southerly as a high pressure centered over New Jersey drifts off the coast.

Anticyclonic flow around the departing high will bring drier, land-modified air (PWATs mainly between 0.50-0.75") across the eastern 2/3rds of the Commonwealth overnight. A moisture gradient will set up along the Alleghenies, with PWATs around 1.50" just westward where high pressure influence has been weaker.

The warm/moist air will continue creeping eastward as the high pressure loses influence over our area, with even a few showers (coverage <30%) possible across our western terminals (primarily KBFD/KJST/KAOO/KUNV) between 09Z Tuesday through the end of the 18Z TAF period. Flight restrictions are not expected with these showers, though briefly steady rain may occur given the moisture in place. Lightning may also be possible, especially heading into the afternoon, though the tall/skinny low-CAPE (<500 J/kg) profile will favor rainfall efficiency over lightning production.

Outlook...

Tue...VFR favored outside of isolated morning fog. Restrictions possible in -SHRA/-TSRA late.

Wed-Sat...Restrictions possible in -SHRA/-TSRA.

CTP WATCHES/WARNINGS/ADVISORIES

None.