The only convective outlooks I've ever seen are national in scale. Mesoscale discussions (as warranted) zoom in on particular areas.
Scraping is the hacky art of identifying a pattern in the HTML of a page and then using that knowledge to extract the bit that you want. For example:
view-source:https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=PNS&format=CI&version=1&glossary=1&highlight=off
The meat of the public information statement is between <pre ...> and </pre>:
<pre id="proddiff" class="glossaryProduct "><span><div></div></span>
387
NOUS41 KBOX 131906
PNSBOX
CTZ002>004-MAZ002>024-026-RIZ001>008-140706-
<a href="/glossary.php?word=Public Information Statement" onClick="return popup(this, 'notes')">Public Information Statement</a>
Spotter Reports
.....
</pre>
Additionally, if you want to avoid the metadata, you can clip it at the "&&".
The obvious problem and downside compared to an API is that if the HTML format of the page changes, you are screwed.
The version 4.0x advforecast2.php code does scraping if you want to look at an example (although not a simple one). I have an version of code that pulled the PNS in this way (I'm using the API now) and can dig it up if you want me to send it (direct message..).