If there is no break in activity, this is considered a tornado outbreak ( although the term " tornado outbreak " has various definitions ).

If severe weather actually does occur, a tornado watch will be upgraded to a tornado warning.

If a tornado is detected on radar or sighted, a tornado warning will be issued either in replacement of or concurrently to the existing severe thunderstorm warning.

If any shelter is designed and built according to certain guidelines then it can be called a tornado shelter which will provide near absolute protection.

If conditions are favorable, then, often even before the original tornado lifts, another wall cloud and occasionally a tornado may form downwind of the old wall cloud, typically to the east or the southeast in the Northern Hemisphere ( vice versa in the Southern Hemisphere ).

* If the rock is missing, there was a tornado.

If a person spots a nearby tornado while driving, the official National Weather Service directive has been for the individual to abandon the car and seek shelter in a ditch or culvert, or substantial shelter if nearby.

If a funnel cloud touches the ground it becomes a tornado.

If the city rezones the property to forbid commercial uses, or if the property is destroyed by a tornado, then both Larry and Emily are excused from performing the contract by impossibility.

If the PIREP contains a report of a tornado, funnel cloud, waterspout, severe turbulence, severe icing, hail, or a low-level wind shear hazard, the identifier " UUA " would be used.

If tornado activity indeed resumes after such a lull, many definitions consider the event to be a new outbreak.

If you were a man '' --

If she, Pamela, were being held responsible for his crimes, then hers must be the final act of expiation.

If someone were to drop a match in here, this place would go up like a haystack ''.

If the other pilots were worried, they did not show it.

If it were the enemy, tactically his position was correct.

If it were not for an old professor who made me read the classics I would have been stymied on what to do, and now I understand why they are classics ; ;

If it were not that I knew who it was I could have mistaken it for my Aunt so well did her clothes fit him.

If an automobile were approaching him, he would know what was required of him, even though he might not be able to act quickly enough.

If there were only darkness, all would be clear.

If there were only the mess, all would be clear ; ;

If these people were denied a voice ( do they have a moral right to a voice??

If we were creating a wholly new society, we could insist that our social, political, economic and philosophic institutions foster rather than hamper man ; ;

If living Jews were unavailable for study, the Bible was at hand.

If his scholarship and formal musicianship were not all they might have been, Mercer demonstrated at an early age that he was gifted with a remarkable ear for rhythm and dialect.

If she were not at home, Mama would see to it that a fresh white rose was there.

If the Stearns were not there, grace would be omitted.

If anything, the conservative Democrats were more opposed to Hearst than the Republicans.

If the hardships of the winter at Valley Forge were trying for healthy men, they were, of course, much more so for those not in good health.

If his circumspection in regard to Philip's sensibilities went so far that he even refused to grant a dispensation for the marriage of Amadee's daughter, Agnes, to the son of the dauphin of Vienne -- a truly peacemaking move according to thirteenth-century ideas, for Savoy and Dauphine were as usual fighting on opposite sides -- for fear that he might seem to be favoring the anti-French coalition, he would certainly never take the far more drastic step of ordering the return of Gascony to Edward, even though, as he admitted to the English ambassadors, he had been advised that the original cession was invalid.

If there were no West Berlin problem, imperialist quarters would have invented an excuse for stepping up the armaments race to try to solve the internal and external problems besetting the United States and its NATO partners.

If the new Soviet series has followed the general pattern of previous Russian tests, the shots were roughly half fission and half fusion, meaning a fission yield of 30 to 40 megatons thus far.

If the Hessian troops sent here willy-nilly by the Hessian Government to fight for England in the 1770's were mercenaries, what shall we call the UN troops sent to the Congo willy-nilly by their governments to fight for the United Nations??

If the UN troops are not mercenaries then the Hessians were not mercenaries either.

If he were to go with White, he would be out there two days, not just listening in the dark at some point between here and Papa-san, but moving ever deeper into enemy land -- behind Papa-san -- itself.

If the fletching is not arranged to induce rotation, it will still improve accuracy by causing a restoring drag any time the arrow tilts away from its intended direction of travel.

If given subcutaneously, it may induce local infection and spread to the regional lymph nodes, causing either suppurative and nonsuppurative lymphadenitis.

If left untreated, it is possible for chlamydia in men to spread to the testicles causing epididymitis, which in rare cases can cause sterility if not treated within 6 to 8 weeks.

If the vocal folds are drawn apart, air flows between them causing no vibration, as in the production of voiceless consonants.

If not handled carefully, they come together very quickly and forcefully, causing injuries.

If a wrestler has secured a rope break from a submission hold, and the offending wrestler does not break the hold on the count of five, causing the offending wrestler to lose automatically, it is still considered a disqualification ( which is kept distinct from countouts in most major promotions ), even though the automatic loss was procured through counting.

If played poorly, this can poison later moves by causing players to flip too many pieces and open up many moves for the opponent.

If this is left untreated, acid from the stomach can back up into the esophagus causing esophagitis, and GERD.

If it is smoked too quickly, it can produce excess moisture causing a gurgling sound in the pipe and an uncomfortable sensation on the tongue ( referred to as " pipe tongue ", or more commonly, " tongue bite ").

If this defect is executed, in certain situations the system will produce wrong results, causing a failure.

If the valve sticks open, rather than causing an overflow and damage, the tank spills into an overflow.

If a tumor is causing syringomyelia, removal of the tumor is the treatment of choice and almost always eliminates the syrinx.

If the current is large enough to generate more heat than the device can lose to its surroundings, the device heats up, causing its resistance to increase, and therefore causing even more heating.

If the impact causes the head to move, the injury may be worsened, because the brain may ricochet inside the skull causing additional impacts, or the brain may stay relatively still ( due to inertia ) but be hit by the moving skull ( both are contrecoup injuries ).

If done correctly, a " Z " shot will apply spin to the ball as well on the final bounce, causing it to rebound perpendicular to the second wall and fall parallel to the back wall, the closer the better.

If, by unfortunate means, non-magical people do happen to observe the working of magic, the Ministry of Magic sends Obliviators to cast Memory Charms upon them — causing them to forget the event.

If an area is plagued by social organizations whose goals are to revolt against social norms, such as gangs, it can cause a negative social capital for the area causing those who disagreed with said organizations to relocate thus taking their positive social capital to a different space than the negative.

If these confining layers are composed of compressible silt or clay, the loss of water to the aquifer reduces the water pressure in the confining layer, causing it to compress from the weight of overlying geologic materials.

If too much ground water is pumped near the coast, salt-water may intrude into freshwater aquifers causing contamination of potable freshwater supplies.

If hair is pinned too tightly, or the whole updo slips causing pulling on the hair in the follicle at the hair root are other scenarios that can cause aggravation to the hair follicle and result in headaches.

If a packet gets lost in the network, the intended recipient will timeout and may retransmit his last packet ( which may be data or an acknowledgment ), thus causing the sender of the lost packet to retransmit that lost packet.

If there are several temperature layers, several mirages may mix, perhaps causing double images.

If the motion causing nausea is not resolved, the sufferer will usually vomit.

If the water level is pumped too low, this will allow the gas to travel up the tubing into the water line, causing the well to become " gassy ".