Just When You Thought It Was Safe to Go Back Outside ...

Heatwise, you're not out of the woods yet, Fridley.

An excessive heat warning from the National Weather Service was set to expire at 10 p.m. Thursday after being in effect over a work week during which high-temperature records fell and heat-index readings rose to dangerous levels. 

But on Thursday afternoon, the NWS extended the warning until 7 p.m. for the Twin Cities and southern Minnesota.

Here is the full text of Thursday afternoon's announcement from the NWS:

Excessive Heat Warning

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 338 PM CDT THU JUL 5 2012 ...

DANGEROUS HEAT WAVE TO CONTINUE THROUGH FRIDAY...

AN EXCESSIVE HEAT WARNING REMAINS IN EFFECT FOR PORTIONS OF CENTRAL MINNESOTA AND ADJOINING AREAS OF WEST CENTRAL WISCONSIN...FROM LUCK TO LADYSMITH...UNTIL 10 PM THIS EVENING.

THE EXCESSIVE HEAT WARNING HAS BEEN EXTENDED UNTIL 7 PM FRIDAY FOR SOUTHERN MINNESOTA...THE TWIN CITIES AND AREAS ON EAST INCLUDING NEW RICHMOND...BLOOMER AND EAU CLAIRE...WISCONSIN.

TEMPERATURES THIS AFTERNOON ACROSS SOUTHERN MINNESOTA INTO WESTERN WISCONSIN WILL BE IN THE 93 TO 99 DEGREE RANGE WITH HEAT INDEX VALUES OF 105 TO 112 DEGREES.

A FRONTAL BOUNDARY NEAR THE IOWA BORDER THIS AFTERNOON WILL LIFT BACK NORTH TONIGHT AND FRIDAY AS A WARM FRONT. THIS WILL BRING YET ANOTHER DAY OF HOT TEMPERATURES AND HIGH HUMIDITY TO SOUTHERN MINNESOTA...THE TWIN CITIES AND ADJOINING AREAS OF WEST CENTRAL WISCONSIN.

THIS COMBINATION OF VERY HOT DAYTIME CONDITIONS WITH VERY WARM OVERNIGHT LOWS WILL RESULT IN VERY DANGEROUS HEAT CONDITIONS. THOSE IN BUILDINGS WITHOUT AIR CONDITIONING OR WORKING OUTSIDE SHOULD USE EXTREME CAUTION AND DRINK PLENTY FLUIDS AND SEEK RELIEF WITH AIR CONDITIONED ENVIRONMENTS WHEN POSSIBLE.

IT WILL TURN COOLER AND LESS HUMID THIS WEEKEND AS A COLD FRONT MOVES SOUTH AND EAST OF THE REGION.