October Is the Forecast Rain Peak: Can Your Point of Sale Still Issue an Invoice When the Internet Drops?

October Is the Forecast Rain Peak: Can Your Point of Sale Still Issue an Invoice When the Internet Drops?

Thunderstorm is one of the trending searches in Saudi Arabia today, Friday 2 October 2026. The reason is plain: the National Center for Meteorology (NCM) expects thunderstorms to continue across large parts of the Kingdom, with possible flash floods, hail and gusty winds in the southwest and west, and dust-raising winds over governorates in the Riyadh region.

This article is not about the rain itself. Last month we wrote about weather forecasts as an input to scheduling. This one is about a question closer to your day: if the power or the internet goes out at your branch for an hour on a rainy day, what stops? Does the point of sale still issue an invoice? Does the card terminal still take payment? Do delivery orders still arrive? And most importantly, what does the Zakat, Tax and Customs Authority (ZATCA) expect from you during that hour?

What the NCM says about today and the rest of the season

According to the NCM forecast carried by the Saudi Press Agency today:

• Moderate to heavy rain over the Jazan, Asir, Al-Baha and Makkah regions, with possible flash floods, hail and gusty winds in parts of these regions and of the Madinah region.
• Light to moderate rain over parts of Madinah, Tabuk, Al-Jouf, Hail and the Northern Borders, and thunderstorms with strong winds over parts of Al-Jouf, Hail, the Northern Borders, northern Qassim and parts of the Eastern Province.
• Dust-raising winds over several governorates of the Riyadh region from 9am to 7pm, with reduced visibility.

Today is not a one-off. On 27 August 2026 the NCM published its climate outlook for autumn, forecasting above-average rainfall in October over most regions of the Kingdom. It said October would be the peak of the expected rain during autumn, with rainfall ranging from heavy to very heavy and possibly torrential in some areas. Chances of above-average rain continue through November in regions including Makkah, Riyadh, the Eastern Province and Qassim.

In other words, October and November lie ahead, and days like today may repeat. Whatever you prepare this week serves you for the whole season.

Rain does not stop a sale. Power and connectivity do

A storm reaches your business through four doors, and each door has systems behind it:

• Power: the point of sale, the router that connects you to the internet, the server if you keep one on site, and every device plugged into the branch socket. A short cut is enough to switch them all off at once.
• Connectivity: a cloud point-of-sale system, the upload of e-invoices to the FATOORA platform, the card terminal if it connects through the branch network, incoming orders from delivery apps, and customer service on WhatsApp. In many branches all of this runs over a single line.
• Location: a server or storage device in a ground-floor storeroom that water can reach if it pools, and equipment plugged straight into the mains with no surge protection.
• People: a driver on the road, a technician at a client site, an employee who cannot get to the branch.

The practical question is not whether the power or the internet will fail, since nobody knows that in advance. It is this: if one of them goes for an hour, what keeps running, what stops, and who at your branch knows the answer today?

Invoicing when the connection drops: what ZATCA says

Many businesses do not know this part, yet the answer is written down in ZATCA's Detailed Guidelines for E-Invoicing, which include a table of failure cases and the action required for each. The guidelines treat the two invoice types differently:

• Simplified tax invoices, usually for sales to individuals: your e-invoicing solution generates and stamps the invoice, then reports it to the FATOORA platform within 24 hours of issue. If the internet drops, selling can continue, provided your solution can issue and store invoices offline and upload them automatically once the connection returns. The guidelines state that a compliant solution must be able to save and archive invoices in XML format without an internet connection. If you cannot report within 24 hours, the guidelines say to notify ZATCA through a dedicated form on its website, and to notify it again once the connection is restored.
• Standard tax invoices, usually for business-to-business sales: ZATCA clearance is a prerequisite for sharing the invoice with the buyer. But the VAT Implementing Regulations allow a tax invoice to be issued by the fifteenth day of the month following the month in which the supply took place, so a short outage usually just means clearing the invoice once you are back online. If the outage lasts long enough to stop you clearing within that window, or you must hand the buyer an invoice before the connection returns, the guidelines say to notify ZATCA through the dedicated form and share the uncleared invoice, keeping records of the transaction and evidence of the clearance attempt, such as the API log, then submit it for clearance and notify ZATCA once the issue is fixed. The detail your client cares about: an invoice handed over before clearance is not eligible for VAT deduction, so send the cleared invoice as soon as you are back online.
• No electricity or a broken device: the action in the guidelines' table is to report the failure to ZATCA, continue business, and regenerate the invoices once fixed. In the broken-device example, the guidelines describe issuing a manual invoice while keeping records of the transaction, then generating the e-invoice with the original transaction date and reporting it immediately after the fix, and notifying ZATCA that the issue is resolved. They also note that a taxpayer who reports failures frequently or for long periods will be investigated further by ZATCA on an individual basis.

So ZATCA has drawn a clear path for outages, but that path assumes your system works offline and that your staff know what to do and when to notify. In our exhibition booth article we explained how to test offline issuing before opening day, and the same test works for your branch before the storm.

The one-hour test: cut the internet yourself before the storm does

Do not wait for a storm to find out how your system behaves. Pick a quiet hour at one branch and try this:

• Disconnect the router from the internet, not from the power. Does the point of sale issue a complete simplified invoice with its QR code? Does it print? Can the cashier see that invoices are waiting to be uploaded?
• Reconnect and watch. Did the invoices upload on their own? Are any duplicated or missing? Who in your business can see the upload status, and where?
• Try a card payment during the outage. Some card terminals connect over their own SIM, others over the branch network. Know which kind you have before the day you need it.
• Trace your delivery orders. Which device do they arrive on, and does it rely on the branch Wi-Fi?
• Then test the power. If you have a UPS, find out how many minutes it lasts under your actual load, and whether it feeds the router and the point of sale or only the server. Its job is to buy time for an orderly shutdown or for a generator to start, not to run the branch for hours.

Write the results on one page: what worked, what stopped, who owns each step on the day of an outage, and who notifies ZATCA if needed. That page is worth more than any promise in a vendor brochure.

Where your data lives

Cloud and on-premises systems fail in different places, so know which one you run:

• A cloud system is untouched if water reaches your storeroom, but without an offline mode it stops at the first internet cut at the branch. Ask your vendor what works at the branch when there is no connection, and for how long.
• An on-premises server keeps working without the internet, but it is a single point of failure if it sits in a ground-floor room water can reach, is plugged in without surge protection, or keeps its only backup in the same room.
• A second connection over a mobile data SIM from a different provider than your fixed line covers you if the fixed line alone fails, provided the router switches to it automatically and you test it the way you tested the first line.

Our backup and disaster recovery article covers how to keep a copy somewhere else and test restoring it.

Drivers and customers on a storm day

• Do not let the system push a driver into danger. Civil Defense guidance during rain calls on people to stay in safe places and keep away from valleys and areas where floodwater collects. If your dispatch system assigns orders automatically and counts delivery time, give it a switch the supervisor controls to pause assignment in an area under a warning, instead of leaving a driver chasing a countdown.
• Prepare the delay message before the storm. One automated message to every customer whose order is late saves you a flood of calls. On the WhatsApp Business Platform, a message to a customer who has not written to you in the last 24 hours needs a pre-approved template (see our article on the 24-hour reply window and its pricing), so prepare the template now, not on the day.
• Official alerts are the reference. A decision to close a site or pause deliveries should rest on NCM alerts and instructions from the competent authorities, not on a clip doing the rounds. Make following them the job of a named person in every region you operate in.

The Origami view

We build business systems: points of sale, ERP systems, dispatch systems. The question we hear most about outages is whether the system works without the internet. A yes or a no is not enough. The right question is what exactly works offline, for how long, how it uploads the backlog when the connection returns, and who sees that the upload is late. A system that cannot answer those questions with a live test in front of you was not designed for outages. It was designed in the hope that they would not happen.

For Saudi business owners, we read this year's rain season as an opportunity that rarely comes along: the risk was announced in advance. The NCM said in August that October would be the peak of the season, and ZATCA wrote its outage path into its guidelines back in 2023. What most businesses lack is not information. It is one hour spent testing their own system before the storm tests it for them.

Conclusion

• October is the forecast rain peak this autumn according to the NCM, and chances of above-average rain continue into November in several regions.
• Simplified invoices are reported within 24 hours of issue, so a short outage need not stop sales if your solution issues and stores invoices offline. Standard invoices need clearance before they are shared, but can be issued up to the fifteenth day of the month after the supply, so a short outage rarely blocks them. Every outage on your side has a notification path in ZATCA's guidelines.
• Cut the internet yourself for an hour at one branch this week, then test the power, and write down what worked, what stopped, and who acts.
• Know where your data lives, where its backup is, and whether you have a second connection the router switches to automatically.
• Have the delay message and the pause-assignment switch ready before the next storm, not during it.

Sources

• Arab News, citing the Saudi Press Agency: Warnings of dust storms in Riyadh as thunderstorms continue across Saudi Arabia (2 October 2026)
• Saudi Press Agency: NCM issues climate outlook for rainfall and temperatures during autumn (27 August 2026, Arabic)
• ZATCA: Detailed Guidelines for E-Invoicing, Version 2 (May 2023), including the failure-case table, the 24-hour reporting window and the clearance requirement
• ZATCA: VAT Implementing Regulations, Article 53 (official Arabic text), for the tax invoice issuance deadline
• Arab News: Saudi weather center warns of heavy rain and flash floods, with Civil Defense guidance (10 September 2026)