(By the way, mods, if this many photos is a bit too much, PM me and I'll be more than happy to drop them to thumbnails.)
I'm going to post half of the trip a day, since the 24th and the 25th only involved one or two sirens each. If the photos from the first half seem fairly run-of-the-mill...the return trip was anything but that.
Day 1, Friday, 5/23: The trip up
After we left, we decided to make time until we were past Richmond, since there weren't any sirens of note that I couldn't easily until after then anyway. After taking US 33 out of Richmond, I tipped Mom off to the presence of an STH-10 in the town of Montpelier. I had discovered it not all that long ago, but it wasn't on the map yet. And so, it became the first siren of the trip...

As we were taking photos, a gentleman came up to the van. After talking with him, I ended up in the bays, where I was shown this.


I have never seen this controller before. The ID plate says it's an "AR2"...which makes no sense to me, but there you have it. Controller and siren came with the department when they moved into the station in 1988. I was also told that this siren, while no longer used for fire calls, is still connected, and the department has tried to get Hanover County to let them sound it for tornado warnings. The county, though, wanted to write up a complicated criteria for setting it off, which the firemen balked at.
Leaving Montpelier, we continued through the hills a ways, until this appeared out of nowhere. We had entered the North Anna EPZ.

This is siren #42, near SR 656. I hadn't added it to the map yet, hence the surprise. Ironically, this was 2 days after the quarterly system test, which I was unable to come and tape due to a suspected vehicle problem which turned out to be much ado about nothing. Oh well, there's always August...
The next siren we visited was siren #55, located at the intersection of US 33, US 522, and Cuckoo Road. (The graininess is the result of high ISO settings which were forced by sub-par lighting.)


Next, we took US 522 into the village of Mineral, which some of you may recognize as being very close to the epicenter of the 2011 earthquake. For railfans, this town is home to a really neat old train station. For siren fans, the FD across the street from said train station has this.


This Darley STH-10 is sounded for fire calls, but doesn't go off with the North Anna system.
Continuing north on 522, we next encountered this North Anna 2806. I couldn't get a box shot of this one, and can't find any location number in my data that precisely matches this one, but a close match would make this siren #49.

Next, North Anna siren #56, located at the intersection of US 522-VA 208 and Chopping Road. Notice the very worn-out number label.


Next, the last North Anna siren we visited - siren #48, located just off of US 522 on Days Bridge Road. What was originally a surprise turned out to be a case of "duh, I already knew about this one and just forgot it was there".


Continuing north, we blew off several known sirens that were too far off our route, and eventually hit Culpeper, a town I hadn't looked through yet. Proceeding to the FD, we discovered these.

No siren was in evidence.
Heading out of Culpeper, I thought enough to photograph this interesting cloud formation. TurbopropPilot should like this one.


The next town we visited was Warrenton, home to a square-horned STL-10 (thank you Allenorgan42099 for tipping me off to it). This strange-looking thing is used as a storm siren. I don't know the testing schedule, but I do know it sounds for the statewide tornado drill in March.

At this point we were out of light and low on time, so we blew off several known sirens and headed for Winchester, where we spent the night in a Walmart parking lot (how classy can it get). During the night I somehow managed to pull in 5 NOAA Weather Radio stations at once - and, of course, taped them all. (That video is going up on my EAS/NWR channel soon, for anyone interested.)
Day 2, Saturday, 5/24: Breakneck speed
Leaving Winchester the next morning, we blew off a known siren as we continued towards Cumberland. Strangely enough, we didn't encounter a single siren in the section of West Virginia we drove through. That was just as well, as we had things we wanted to see at the festival later that day.
Once we were in Maryland, though, a few surprises popped up - namely, this Model 2 in Oldtown...

...this very festive Eclipse 8 in Bowling Green, not far from the fairgrounds...

...and this cute little 2HP Screamer in the hamlet of Cresaptown. I would soon return to this town after learning what else they had...

That's all from the first two days. Tomorrow, the rest of the trip, two days of surprises, excitement...and a random covered bridge. Stay tuned!
