This morning John Swett Unified School district and four campuses are closed this morning. We want to first get a check of the forecast for you this morning. Definitely a fall start. Fall start, Cool Temperatures. As we look at this, when that refinery fire first broke out, it was visible on satellite imagery, thats a look at the arrow pointing towards that. Now as we wake up this morning, air quality is improving, we are seeing clouds still around the area but we have to watch out for that with light winds picking up from the northwest at about 7 Miles Per Hour in the area of crockett. And we are going to see some improvement today in the air quality as well as our temperatures coming down a few degrees. Well talk about some rain moving in, and mike seeing a lighting change in palo alto . Thats right because up until a few minutes ago, this section was well lit by crews, they have cleared, still a couple lights, thats moving north as far as the clearing goes up. So you may see a little more slowing for the next few minutes headed down to the dunbarton bridge on 101. Theres a crash out of the livermore pleasant area, but no problems. I80, i dont want to steal your thunder but folks that is open for the commute. Back to you. Investigators plan to be out at the site all day today to learn what sparked the inferno at the facility in crockett. The fire was huge and burned for seven hours. The fire and smoke created numerous problems and raised concerns about health and the traffic affected in that area. Amazing. The video showing the moment one full tank exploded into that huge fireball. A total of two storage tanks blew up, sending huge plumes of smoke skyward for hours, forcing i80 to close in both directions. All lanes are open the this morning. It also triggered a shelter in place for crockett and surrounding communities. The air quality by last night rebounded enough to allow authorities to lift the shelter in place. B and firefighters tweeted out schools will be open but thats not the case. All schools will be closed. Today in the bays thom jensen live in crockett. Hows the air quality this morning . Reporter i can tell you its improved in in the last hour and a half or so as the winds picked up. Theres still a smell of burning oil, smoke in the air. Stronger earlier. We saw firefighters down by these tankers earlier spraying water and foam and we saw some of the foam as the winds picked up blow puffs of the foam up the hillside. But calmer than it was yesterday. Weve seen investigators on the scene with flashlights going around the edge of the tank, possibly beginning that early investigation into what caused this or maybe making sure that everything is sealed up properly. We hope to get new information as the day wears on. It began with two explosions at about 1 30 yesterday afternoon, the blast sent the top of one of the tanks hurling into the air and people said the ground shook violently. Then the inferno that caused such a smoke cloud that the interstate was closed throughout the afternoon until about 10 00 last night. A shelter in place was ordered for crockett and rodeo and people were told to turn off the air Conditioning Systems to keep the smoke out of their homes. So finally announcing the shelter in place and fire restrictions were lifted last night. All of the shelter in place warnings have been lifted for both the freeway, interstate 80, and the communities of crockett, rodeo, and the northern part of hercules. With an all clear we ask residents impacted to please open your doors and windows to air out buildings and homes. You can resume normal activities at this time. Reporter now there is no indication that there was any environmental damage to any of the coolschools. But out of an abundance of caution and also to give them time enough to alert parents, the School District made the call early yesterday evening to close all schools in John Swett Unified School district. We caught that this morning, that means middle school school, john swett high school, rodeo elmen induste elmen tri and willow high school. Investigators will take advantage of the daylight in the next couple hours when it comes to see what caused the fire here at the Nustar Energy facility in crockett. Were live in crockett, thom jensen today in the bay. Thank you so much. Theres more coverage on the fire on our home page, including video from skyranger. Head to nbcbayarea. Com its our top story. In washington d. C. , President Trump hosts the italian president at the white house. It come comes as the impeachment inquiry continues on capitol hill. Scott mcgrew is following that, his checks and balance segment is coming up for us later at 5 45. In ohio last night, a dozen democratic hopefuls honed in on President Trump as they went headtohead in the latest president ial debate. Tracie potts has the highlights. Reporter democrats, a record 12 on one stage, all targeting President Trump. We have an erratic, crazy president , who knows not adamn thing about foreign policy. This president has betrayed american values. I saw this play in 2016s election. He has committed crimes in plane sight. Reporter they also attacked each other, their favorite target elizabeth warren. I think that senator warren is more focussed on being punitive. Reporter warren now surging in the polls, pushed to explain medicare for all, who pays for that . I think we owe it to the American People to tell them where were going to send the invoice. I will not sign a bill into law that does not lower costs for middle class families. Reporter Bernie Sanders back two weeks after a heart attack. Im healthy, feeling great but i would like to respond to that question. Reporter admits taxes will go up. Substantially less than what they were paying for premiums and out of pocket expenses. Reporter debated syria. Donald trump has the blood of kurds on his hands. Police violence is also gun violence. Reporter and taxing the wealthy. Tom steyer, new to the stage i would undo every republican tax cut for rich people and major corporations. Reporter interestingly, present trump didnt tweet about the democrats during the debate. Tracie potts nbc news washington. 5 08 right now. If you havent felt the shaking going on in the bay area over the past 30 hours or so, youre probably in the minority. Thats because there are two seismic hot spots and a lot of neighborhoods have been rattled. The latest quake, a 4. 7 struck yesterday afternoon, it follows the 4 monday night near pleasant hill. Yesterdays quake sent one shop owner running from her liquor store, she was worried about bottles from the shelves which didnt happen. In another video you can hear when the quake starts. The shaking left people rattled. I felt my house move and it was like an ocean, we had waves going on. Then i heard my kids start screaming because they did not think it was the coolest thing in the world. Reporter no reports of damage but the quake was felt across large parts of the south bay and santa cruz county. Experts are certain this struck along the san andreas fault. Heres the seismograph of last nights 3. 4. This has been the strongest aftershock from monday nights shaks shaker. Hundreds of University Buildings pose a threat if and when the next quake hits. Thats according to a statewide review looking at safety on college campuses. Our unit spent months digging into these reports and uncovered classrooms, libraries and even a nuclear lab all received poor seismic ratings. How big a risk are some of these buildings . Its a great question. The Safety Standards are high. Theyre worried about these extreme, rare gigantic earthquakes, 1906 happening again. This isnt loma prieta, this isnt even north ridge. So people are being good about doing something while we have time. Its like dont panic, but dont delay. Tonight at 6 00 we find out whats being done to fix the problem. Well also show you some of the new Technology Used to find critical weaknesses in buildings that were one thought to be safe. As we come up on 5 11, as weve been sharing our stories about loma prieta. Kimmy said that she was in San Francisco, a friend and her were driving. She thought something was wrong with the car until things were breaking off of buildings and they realized they were having an earthquake. And they realized they were stung in the city. Share your stories with me o facebook and twitter. Coming up at about 5 25 well talk about the difference between magnitude and intense fip as we get out the door this morning, a live look outside in fremont, clouds and Cool Temperatures in the 50s. Well see clouds throughout the day with low 60s at noon. Well have a slighter cooler day thank gs to the cloud cover and an approaching storm system that could bring us spotty rain later tonight. Mike youre checking out the trivalley. Thats right. Everything else is looking great. Over here we are looking at the crash, west 84 just before 680. The crash is clear of lanes but the distraction, they may be slowing traffic a bit. So well track that. Pretty typical schedule for the trivalley. Folks just starting to gather for the lanes approaching the toll plaza. Back to you. Are you ready for the next recession . A new survey finds a Staggering Number of americans are not. What you need to do to be prepared. If you fly from San Francisco to new york you might think youre on an allday flight. Thats not an all day flight. Jennifer anniston signing up on instagram, breaking down the social media app. Her first post next. Youre watching today in the bay. Tv just keeps getting better. How you watch it does too. This is xfinity x1. Featuring the Emmy Awardwinning voice remote. Streaming Services Without changing passwords and input. Live sports with realtime stats and scores. Access to the most 4k content. And your movies and shows to go. The best tv experience is the best tv value. Xfinity x1. Simple. Easy. Awesome. Xfinity. The future of awesome. av man do you ok to watch a movie . E . woman yes. Ill pick. avo imagine what you can do with more migrainefree days. woman here, catch avo when youre not fighting through migraine, imagine the possibilities. Oncemonthly emgality is a preventive treatment for migraine in adults. Its specifically developed to help give you more migrainefree days. With emgality, about 60 of people had their migraine days cut in half or more. Dont use if allergic to emgality. Allergic reactions, such as itching, rash, hives and trouble breathing can occur even days after using. Common side effects include injection site reactions. woman what should we watch tomorrow . avo ask your doctor about emgality. And imagine more migrainefree days. Right now at 5 15 lets look outside over the south bay and see how our temperatures shape up for the morning in santa clara. It will be a cool start, more clouds moving in well be at 50 degrees and stay there through about 10 00, a slow warm up as we wont have much in the way of warm temperatures today and the next few days. Well talk about the changes ahead in less than five minutes. The bay bridge toll plaza starting to build right now. The reason for them to turn on lights. And your approach, see how things are rolling. Good morning, very happy wednesday to you. There is growing concern that the deal that President Trump announced between the u. S. And china may not stick. Most importantly we havent seen a text of the deal. Netflix reports profits today. This will be the last time it talks about profits before its hit with competition, streaming channels. Amazon is making a change. Its going to allow its prime customers to order low cost items, say a 2 toothbrush and get it delivered next day for free. It used to be you had to bundle low cost items together before amazon would ship for free. This is bad news for any store you might stop in for a quick item, why do that when you can get it from amazon. Twitter is clarifying its rules to say even World Leaders may face some consequences if they post violent or threatening messages. This comes as democratic candidate for president , Kamala Harris is pushing twitter to sanction donald trump for some of his past posts and to kick him off the service. Theres no question some of his past posts have violated terms of service. Twitter lets World Leaders post what the rest of us wouldnt get away with because theyre World Leaders and what they say is important in twitters opinion. The number of houses for sale has fallen mostly because of low interest rates. The number of houses available to buy is at a twoyear low. On friday, quantu airline is set to conduct an expert when it flies from new york city to sidney, australia. It has never been done before. There will only be a few passengers and several scientists and doctors on board to measure the pilots alertness and effects of long flights to passengers. Now 20 hours is not quite one day, but because of the time of day it leaves on friday and when it arrives and the rotation of the earth it actually arrives on sunday. Can you imagine . My goodness, thats a long time to be on a plane. Imagine being in coach. No. Leg room. I dont need that, im good. Thanks, scott. 5 18 right now. A new survey out saying that 40 of americans not prepared if a recession hits in six to 12 months. Saying also that rate includes more than 40 Million People who say theyre not at all prepared. Despite recession fairs, one third say theyre not doing anything to prepare. For those who are preparing, some are spending less, saving more for emergencies or paying down credit card debt. Now to the one about the alist actress who blew up instagram. For her first post on the site, she thought shed take a selfie with her friends stars. It was so popular her page crashed. She has 7. 1 million followers, keep in mind Jennifer Anniston joined instagram yesterday. Lets reinact that, well get this group of friends here. I would take the. 1 million. Yeah. Look, heading outside this morning probably need a jacket. Its cool. Its been cool the past few mornings. Huddle up with those friends and try to keep warm. Heres emeryville. Were going to see more cloud cover today than weve seen the past couple days. You may have to crank up the here heater in the car as you go out for your morning commute. In antioch, at 50 degrees and then seeing it warm up the rest of the day. Well see the sun peaking from behind the clouds with our south bay temperatures in the upper 70s to low 80s. As the clouds move in, its going to keep it cooler in a few spots. We also see this cold front dipping in from the Pacific Northwest and will bring in a chance of spotty showers, going throughout the day, looking at partly to mostly cloudy skies. This is what the radar could look like at 10 00 tonight, especially in parts of the north bay, not everyone is going to see the rain but we could start with wet roads tomorrow morning as the system drops a few hundredths of an inch of rain. Well see spotty Early Morning showers, clearing out the rest of the day, highs inland in the 70s. We have more 70s in the forecast but it warms up next week, going back to summer to start the new work week. Mid 80s inland with San Francisco going from the mid 60s to the lower 70s. Youre tracking a problem on the san mateo bridge. Yes. A potential problem for your drive. Eastbound light. Here the arrow points to the service area where theres a disabled vehicle there blocking only the service lane. Thats whats going on across the bay. As a crew arrives to help tow that away, we may have to have the one lane blocked for a couple minutes. No major problem there is. Its 5 22 in just a second here, watch the clock change and a smooth drive the crash still over there. 680 not a problem for the transition. 242, that transition, a distraction by a crash there. We have the metering lights on on the tollway. We are looking back at 30 years since loma prieta earthquake. As anyone who lived through it will tell you it left parts of the bay area in sham blesham. We have a look at why the shaking had such a widespread impact. Youre watching today in the bay. We switched our detergent to one thats clean. And if you make the switch youll see what we mean. Tide purclean, because its made with plants. Tide purclean, gets stains out his pants. Tide purclean, it has nothing to hide. Its made with plants and has the cleaning strength of tide. The first plantbased detergent with the cleaning power of tide. 5 25 right now. Tomorrow officially marks 30 years since the loma prieta earthquake devastated the bay area. The quake had a 6. 9 magnitude and its intense waves destroyed buildings, collapsed bridges and killed dozens. And has experts quick to point out there is a difference between the magnitude and intensity. Today keri is breaking it down for us. When an earthquake strikes we want to know the magnitude which is a measure of the energy released at the source of the earthquake on the size me graph. That doesnt tell you how the sha shaking will affect the structures. The mercalli measure scale is a measure of the intensity of the shaking. It goes from a 1 to 13. The loma prieta earthquake was a 6. 9 magnitude and a 9 on the intensity scale. At a 9, damage is considerable, even in well designed framed structures and buildings are shifted off foundations. Some buildings and structures collapse. Which is what we witnessed with the sections of the freeway and the bay bridge. Numerous structures were shaken and destroyed, causing an estimated 10 billion in damage. Tomorrow ill go through a time line of the shaking traveling across the bay area and show how fast seismic waves move. We look forward to that. 5 26 right now. Coming up next, top stories were following for you. Including another bay area parent charged in the College Admission scandal heads to court today to learn her fate. The possible jail time shes facing. The schools that will be closed today following the massive fire at an oil facility in crockett. Taking a live look outside