July 31st, 2008 by Steven DiMartino
TODAY THROUGH SATURDAY:
Today: Clearing skies with winds from the west around 5 mph. Temperatures will rise into the mid 80’s to lower 90’s with a heat index in the upper 90’s for southern suburbs of Philadelphia.
Tonight: Clear skies with winds from the west around 5 to 10 mph. Temperatures will fall into the lower 60’s to lower 70’s for lows.
Friday: Clear to partly cloudy with winds from the southwest around 5 to 15 mph. Temperatures will range from the mid 80’s to lower 90’s for highs and a heat index in the mid to upper 90’s.
Friday Night: Increasing clouds with winds from the southwest around 5 to 15 mph. Temperatures will fall into the lower 60’s to lower 70’s for lows.
Saturday: Showers and thunderstorms with winds veering from the southwest to west around 5 to 15 mph. The strongest thunderstorms will be capable of large hail, wind gusts over 65 mph, heavy downpours, and frequent lightning. Temperatures will range from the upper 70’s to lower 80’s for highs.
SUNDAY THROUGH WEDNESDAY:
Sunday: Clear to partly cloudy. Temperatures will range from the lower 60’s to lower 70’s for lows and upper 70’s over the Hudson Valley to lower 90’s over southern New Jersey.
Monday: Hazy, hot, and humid with afternoon strong to severe thunderstorms. Temperatures will range from the mid 60’s to lower 70’s for lows and mid 80’s to mid 90’s for highs.
Tuesday: Hazy, hot, and humid with afternoon strong to severe thunderstorms. Temperatures will range from the mid 60’s to lower 70’s for lows and mid 80’s to mid 90’s for highs.
Wednesday: Hazy, hot, and humid with afternoon strong to severe thunderstorms. Temperatures will range from the upper 60’s to upper 70’s for lows and mid 80’s to mid 90’s for highs.
July 31st, 2008 by Steven DiMartino
A strong MCS moving southeast from North Dakota will bring the potential for severe weather for much of 
the northern Plains and Mid West. As the MCS moves south this morning, the out flow boundaries from the system will move ahead to the south and east, which will lead to the development of additional super-cell thunderstorms. The atmosphere is already moist and unstable, however additional wind shear will aid in the formation of hail, wind gusts exceeding 65 mph, deadly cloud to ground lightning, heavy downpours, and tornadoes.
Meanwhile, a cold front will produce showers and thunderstorms over the southern Mid Atlantic and Southeast coast. The atmosphere is very warm and moist to the south of the cold front, however the cool dry air aloft will aid in destabilizing the atmosphere further. Speed shear is more a concern this morning than direction, so feel greatest threat is large hail and wind gusts over 60 mph. The strongest thunderstorms will also be capable of heavy downpours and frequent lightning.
Finally, the cold front is also departing New England with a risk of severe thunderstorms. Personally, I think this threat is all but done for this morning. However, the strongest thunderstorms will be capable of small hail and wind gusts exceeding 55 mph.
July 31st, 2008 by Steven DiMartino
The tropical disturbance moving over the Cape Verde Islands this morning has shown little sign of 
development and is moving towards cooler waters. The disturbance is now moving northwest into the Atlantic and is not expected to develop over the next several days due to unfavorable conditions, specifically the cooler water temperatures. Although upper level winds will remain light over the next 48 hours, a trough is expected to move close to this disturbance to produce southwesterly shear and perhaps absorb the disturbance by the beginning of next week.
July 30th, 2008 by Steven DiMartino
TODAY THROUGH FRIDAY:
Today: Clear to partly cloudy and hazy. Winds will be from the southwest around 5 to 10 mph. Temperatures will rise into the mid 80’s to lower 90’s for highs.
Tonight: Partly cloudy with showers and thunderstorms in the late evening. Winds will be from the southwest around 5 to 10 mph. Temperatures will fall into the mid 60’s to mid 70’s for lows.
Thursday: Showers and thunderstorms in the morning followed by clearing skies. Winds will be from the southwest around 5 to 10 mph. Temperatures will rise into the lower 80’s to lower 90’s for highs.
Thursday Night: Clear to partly cloudy. Winds will be from the west around 5 to 10 mph. Temperatures will fall into the mid 60’s to lower 70’s for lows.
Friday: Clear to partly cloudy with winds from the west around 5 to 10 mph. Temperatures will rise into the lower 80’s over the Hudson Valley to mid 90’s over the Philadelphia metro with humid conditions.
SATURDAY THROUGH TUESDAY:
Saturday: Hazy, hot, and humid with afternoon showers and thunderstorms. Temperatures will range from the lower 60’s to lower 70’s for lows and lower 80’s over the Hudson valley to upper 90’s over the Philadelphia metro for highs. Heat index will range from the upper 90’s to lower 100’s.
Sunday: Hazy, hot, and humid with afternoon showers and thunderstorms. Temperatures ranging from the lower 60’s to lower 70’s for lows and upper 70’s over the Hudson valley to upper 90’s over the Philadelphia metro for highs. Heat index will range from the upper 90’s to lower 100’s.
Monday: Hazy, hot, and humid with afternoon showers and thunderstorms. Temperatures ranging from the lower 60’s to lower 70’s for lows and upper 70’s over the Hudson valley to upper 90’s over the Philadelphia metro for highs. Heat index will range from the upper 90’s to lower 100’s.
Tuesday: Hazy, hot, and humid. Temperatures ranging from the lower 60’s to lower 70’s for lows and upper 70’s over the Hudson valley to upper 90’s over the Philadelphia metro for highs. Heat index will range from the upper 90’s to lower 100’s.
July 30th, 2008 by Steven DiMartino
Wind shear has begun to weaken over the past hour as the upper disturbance approaching the region has begun to lift off to the northeast. While strong thunderstorms will remain a possibility, the greatest threat this evening will be the showers.
July 30th, 2008 by Steven DiMartino
A severe thunderstorm has developed over Berks County. This thunderstorm has produced and continue to produce penny size hail, wind gusts over 60 mph, frequent cloud to ground lightning, and heavy downpours. This thunderstorms will be moving past the following towns:
Leesport at 5:30 PM
Fleetwood at 6:00 PM
July 30th, 2008 by Steven DiMartino
A severe thunderstorm has developed over Lancaster and Lebanon Counties of Pennsylvania. The severe thunderstorms will be capable of penny size hail, wind gusts over 60 mph, frequent lightning, and heavy downpours.
The severe thunderstorm will impact the following towns:
Rothsville at 5:05 PM
Kleinfeltersville at 5:25 PM
Richland at 5:40 PM
Denver at 5:45 PM
and Reamstown at 5:50 PM
July 30th, 2008 by Steven DiMartino
The cold front and weakening upper disturbance over the eastern Great Lakes and Ohio Valley is moving 
towards the forecast area this afternoon and will likely bring rain to the forecast area this evening and overnight.
A developing low level jet stream at 850 MB is beginning to enhance thunderstorms ahead of the main area of rainfall. Vertical direction and speed shear is increasing over much of eastern Pennsylvania and New Jersey and will likely do so for locations further east through New Jersey into southeastern New York including the New York City metro. As a result, the potential for strong to severe thunderstorms will increase in threat through the evening hours ahead of the heavy rainfall, which is stabilizing the air mass over central Pennsylvania.
The strong to severe thunderstorms will be capable of frequent lightning, wind gusts exceeding 65 mph, large hail, and heavy downpours. Rainfall amounts of over an inch is possible in some of the strongest thunderstorms
July 30th, 2008 by Steven DiMartino
The Monthly News Letter for July has been issued in the past 30 minutes. If you do not get the news letter by this evening for those that signed up, then let me know and I’ll send it to you again.
The themes that’s covered this month include the heavy rainfall of late and what impacts have been made on the drought conditions over the last year and so. Also a discussion on the tropical weather season so far and why the severe thunderstorms have been so impressive this summer! Plus some more!
Thanks!
Steven DiMartino
July 30th, 2008 by Steven DiMartino
Today will not be an very active day for severe weather, however heavy rain is a different story.
The remnants of Dolly continue to produce heavy rain throughout the southern Plains and Mid West this morning and will continue to do so through the afternoon hours. The showers and thunderstorms will remain below severe levels, however the outflow boundaries from these showers and thunderstorms may spark isolated severe thunderstorms to the south over northern Texas, Arkansas, and Louisiana.
Meanwhile, a weak disturbance over the Great Lakes with associated surface cold front will slowly move through the eastern Great Lakes this afternoon. The upper level dynamics are not very impressive with this cold front and the mid level disturbance is forecasted to leave the surface boundary behind as the disturbance pulls into eastern Canada.
However, a stronger upper level disturbance and trough will move through the northern Plains and through the Great Lakes through the evening hours. Some marginal wind shear over the northern Plains will support a few isolated severe thunderstorms capable of wind gusts over 65 mph and large hail. The good news is that tornadoes are not expected with this or any other disturbance today.
