These people should have had at least a 15-20 minute warning easy.
FWIW, they
did have 30-40 minutes of warning! The first tornado warning for Carter County issued by the OUN NWSFO for that storm came out at 6:50 pm. At 7:15 pm, a new tornado warning was issued that specifically mentioned Lone Grove:
* AT 715 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES SOUTH OF WILSON...MOVING NORTHEAST AT 40 MPH.
* LOCATIONS IN THE WARNING INCLUDE ARDMORE...LONE GROVE...NORTHERN[FONT=lucida sans typewriter, lucida console, courier] LAKE MURRAY...OVERBROOK AND WILSON.
[/FONT]I think the tornado came into Lone Grove near 7:28 pm, and a 7:31 pm Severe Weather Statement noted "AT 731 PM CST...DOPPLER RADAR AND STORM SPOTTERS OBSERVED A TORNADO [FONT=lucida sans typewriter, lucida console, courier]NEAR LONE GROVE...MOVING NORTHEAST AT 35 MPH.[/FONT]"
Now, it is a problem if the outdoor warning sirens did not go off. However, the residents did have warning if they had means to receive the warning. The OUN NWSFO did a good job with the warnings it seems, and Lone Grove was in the polygon for at least 10-13 minutes before the tornado hit (I don't think the town was in the first warning polygon issued at 6:50, but I'm not sure). Those who had weather radios or were tuned in to local media (TV, battery-operated radio, etc), or those that generally had a means by which to receive such a warning without a dependence on outdoor warning sirens, should have received ample warning. Nobody should *rely* on outdoor sirens to warn them, particularly since many are on AC power only (AFAIK - not as many have battery backup), which means that you are toast if power is cut to the siren and you rely solely on that siren to warn you of impending hazardous weather.
EDIT: I don't mean this to sound cold or not compassionate! I really am pained to hear that 7+ people died, and many more were injured. The sirens certainly SHOULD have sounded if they didn't, and the county emergency management officials should have been plenty prepared given the SPC outlook and tornado watch. However, it IS important to take your own safety into your own hands by making sure that you have a reliable and alternate/secondary means by which to receive a severe weather warning.