Today is forecast to be nearly the same temperature as yesterday.
Nowcast as of 6:55 am CDT on July 12, 2009
Now
Through 9 am...showers and thunderstorms will continue moving to the south at 25 mph across northern Arkansas. The most concentrated activity will affect locations across Boone and Newton counties. Rainfall amounts will average 1/4 to 1/2 inch...with up to one inch in heavier downpours. Localized flooding could occur in low lying areas.
Forecast for Johnson
Updated: 4:30 am CDT on July 12, 2009
Heat advisory in effect until 7 PM CDT Tuesday...
Today
Mostly sunny. Isolated showers and thunderstorms during the day. Highs around 100. Southwest winds 5 mph. The chance of precipitation 20 percent. Average rainfall less than 1/10 inch. Heat index values 100 to 104 in the afternoon.
Partly cloudy. Isolated showers and thunderstorms in the evening. Lows in the mid 70s. South winds 5 mph in the evening...shifting to the northeast after midnight. The chance of precipitation 20 percent in the evening.
Monday
Mostly sunny. Highs around 101. West winds 5 to 10 mph. Heat index values 103 to 108 in the afternoon.
Partly cloudy. Lows in the mid 70s. Southwest winds 5 to 10 mph in the evening...becoming northwest after midnight.
Tuesday
Mostly sunny. Highs around 102. West winds 5 to 10 mph in the morning...becoming southwest 10 to 15 mph in the afternoon. Heat index values 101 to 106 in the afternoon.
Mostly sunny. Highs around 100. Heat index values 100 to 103 in the afternoon.
Wednesday Night
Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. The chance of precipitation 20 percent.
Thursday
Partly sunny. A slight chance of showers and thunderstorms. Highs in the upper 90s. The chance of precipitation 20 percent. Heat index values around 100 in the afternoon.
Thursday Night
Mostly cloudy. A slight chance of showers and thunderstorms. Lows around 70. The chance of precipitation 20 percent.
Friday
Partly sunny. A slight chance of showers and thunderstorms. Highs in the lower 90s. The chance of precipitation 20 percent.
Friday Night
Mostly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 60s. The chance of precipitation 20 percent.
Saturday
Partly sunny. A slight chance of showers and thunderstorms. Highs in the lower 90s. The chance of precipitation 20 percent.
... Heat advisory in effect until 7 PM CDT Tuesday...
The National Weather Service in Little Rock has issued a heat advisory... which is in effect until 7 PM CDT Tuesday.
The combination of unseasonably warm temperatures and high relative humidity will allow for afternoon heat index values of 105 to 110 degrees today... Monday and Tuesday. These dangerous heat index readings will last for several hours during the afternoon and into the evening hours. Heat index values in isolated locations could briefly exceed 110 degrees.
Even though temperatures will drop off during the evening... there will be little relief... as overnight low temperatures range from 75 to 80 degrees.
Precautionary/preparedness actions...
A heat advisory means that a period of hot temperatures is expected. The combination of hot temperatures and high humidity will combine to create a situation in which heat illnesses are possible. Drink plenty of fluids... stay in an air-conditioned room... stay out of the sun... and check up on relatives and neighbors.