Near term - through 9pm this evening -
...Another sultry day in the northeast today. Temperatures started out at a low of 63 in Keene - 4 degrees higher than yesterday, and have since then risen to 70 at 7:35am. All locations in New England are starting out on a platform higher than yesterday, which promises to rise to near record levels today. 850mb temperatures of 19 to 20C promise highs to reach into the low to mid 90's. The record high in Keene is 94 for today, which may be threatened if the current 4 degree advantage hangs on. Latest MOS forecasts project highs of 92, 94, and 96. The highest being the GFS forecast. 93 is looking most probable given potential cloud contamination in the afternoon. In addition, dew points are starting out in the mid 60's (64 in Keene), and based on the latest forecast soundings, will approach or exceed 70 this afternoon. The combination of temperature and dew point will produce heat indices between 95 and 99 degrees in Keene, and possibly exceeding 100 in portions of eastern MA and down into CT. Heat Advisories have been issued for western CT.

Skies are mostly clear in the area. There was some patch fog this morning in lower lying areas. Widespread haze will hang on through 9am across the region, and may continue through the afternoon given high dew points. A backdoor cold front has slowly progress southward into central Maine and will continue to sag towards the area today. While this is a weak front, it will be enough of a forcing mechanism to break through a weak cap and get storms rolling this afternoon. Convective condensation levels are at about 9500ft this morning with a convective temperature of about 91. Yesterday we hit 91 at 2:15pm, so between 1:30 and 2pm is looking good for storm formation. So, expect cumulus development after 1pm with cumulonumbi going up by 2:30pm for sure. Main thunderstorm threatwill be between 4pm and 9pm. Any thunderstorms will produce heavy rainfall. PWATs are 1.9 to 2.0 inches. If any training occurs, flash flooding could be a problem. Otherwise, damaging winds will be the next main issue, along with frequent CTG lightning. Moderate hail is possible with a few storms. Shear is light across central New England, however across central and southern Maine, 40 to 50kts of shear will allow for the potential of a few tornadoes this afternoon.

Short term - Tonight through Thursday night -
...Thunderstorm threat will continue through around 10pm as forcing remains despite loss of heating. After midnight, skies will remain mostly cloudy as main cold front currently draped across the midwestern states advances east into New York. Temperatures will stay up near 70 with cloud cover along with dew points remaining between 64 and 68. All in all, a very sticky night ahead.

Skies will be mostly cloudy to start Thursday morning, with cumulonimbi already forming. There will be a line of thunderstorms ongoing ahead of the front, however it will likely give way to a new line developing in the late morning. Weakening storms will likely affect the area in the late morning, however could still have wet microbursts and winds threat. The timing of the front is becoming more in focus, with main line of thunderstorms out ahead passing Keene around noon to 1pm. These storms will contain damaging winds, hail, frequent lightning, and heavy rainfall. Keene could get in on some of the severe weather as the thunderstorms strengthen on approach. The main area of concern is still further east however. The SPC has oulined eastern and central New England in a slight risk on the day 2 convective outlook.

With cloudy skies expected for the majority of the day before thunderstorms stabilize the air, temperatures will not have a chance to rise much. 850mb temperatures around 20C along with a high starting platform will help temperatures into the lower 80s by noontime before storms cool off the air for good. It is becoming more unlikely that many areas will reach 90 tomorrow except extreme eastern MA where storms will not cross until the afternoon.

Slight thunderstorm threat will continue through the evening as the air remains moist enough to support developing storms. Second frontal passage occurs in the late evening, bringing partly cloudy skies and cooler and drier weather. Low temperatures will fall into the mid 50's.

Long term - Friday through Tuesday 7/3 -
...Friday and Saturday will feature sunny skies and temperatures about 20 degrees cooler than today. Dew points will drop into the 40s and low 50s, which will feel much more comfortable.

Sunday, a short wave will move north of the region, with an associated cold pool in the upper levels. On the off chance that high pressure is weaker and the short wave swings further south, Keene may have to deal with some scattered showers or thundershowers with hail. Have included scattered showers in the forecast for Sunday, although it may turn out dry. Either way, expect cool temperatures around 70.

A slow warm up will begin on Monday with highs into the upper 70's by Tuesday. Dry weather will prevail through the middle of next week.

&&

Forecaster: SL
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Weather history:
6/27 in Keene, NH:
average high is 80, record is 94
average low is 54, record is 40

Astronomy:
Sunrise: 5:11AM Sunset: 8:32PM
Moonrise: 6:23PM Moonset: 2:22AM
Length of visible light: 16 hours 31 minutes
Length of day: 15 hours 20 minutes
-Tomorrow will be 26 seconds shorter

6/27 across the United States:
1901 - There was a rain of fish from the sky at Tiller's Ferry. Hundreds of fish were swimming between cotton rows after a heavy shower. (David Ludlum)

1915 - The temperature at Fort Yukon AK soared to 100 degrees to establish a state record. (The Weather Channel)

1957 - Hurricane Audrey smashed ashore at Cameron, LA, drowning 390 persons in the storm tide, and causing 150 million dollars damage in Texas, Louisiana and Mississippi. Audrey left only a brick courthouse and a cement-block icehouse standing at Cameron, and when the waters settled in the town of Crede, only four buildings remained. The powerful winds of Audrey tossed a fishing boat weighing 78 tons onto an off-shore drilling platform. Winds along the coast gusted to 105 mph, and oil rigs off the Louisiana coast reported wind gusts to 180 mph. A storm surge greater than twelve feet inundated the Louisiana coast as much as 25 miles inland. It was the deadliest June hurricane of record for the U.S. (David Ludlum) (The Weather Channel)

1987 - Thunderstorms moving out of Nebraska produced severe weather in north central Kansas after midnight. Thunderstorm winds gusting to 100 mph damaged more than fifty camping trailers at the state park campground at Lake Waconda injuring sixteen persons. Thunderstorm winds gusted to 80 mph at Beloit and Sylvan Grove. (The National Weather Summary) (Storm Data)

1988 - The afternoon high of 107 degrees at Bismarck, ND, was a record for the month of June, and Pensacola, FL, equalled their June record with a reading of 101 degrees. Temperatures in the Great Lakes Region and the Ohio Valley dipped into the 40s. (The National Weather Summary)

1989 - Thunderstorms produced severe weather from the Ohio Valley to western New England. Thunderstorm spawned six tornadoes, and there were 98 reports of large hail and damaging winds. Tropical Storm Allison spawned six tornadoes in Louisiana, injuring two persons at Hackberry. Fort Polk LA was drenched with 10.09 inches of rain in 36 hours, and 12.87 inches was reported at the Gorum Fire Tower in northern Louisiana. (The National Weather Summary) (Storm Data)

Yesterday (6/26):
Keene: H 93, L 59