From fb4e111f84b4f37d5597da83ccf7d10bd39d4f02 Mon Sep 17 00:00:00 2001
From: Dan Paulat <dpaulat@gmail.com>
Date: Wed, 1 May 2024 22:41:02 -0500
Subject: [PATCH] Handle 8-bit ASCII characters in product units >= 128

---
 scwx-qt/source/scwx/qt/map/radar_product_layer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scwx-qt/source/scwx/qt/map/radar_product_layer.cpp b/scwx-qt/source/scwx/qt/map/radar_product_layer.cpp
index cbc7da0c..79d03ce6 100644
--- a/scwx-qt/source/scwx/qt/map/radar_product_layer.cpp
+++ b/scwx-qt/source/scwx/qt/map/radar_product_layer.cpp
@@ -432,7 +432,7 @@ bool RadarProductLayer::RunMousePicking(
                // displayed
                hoverText = fmt::format("{}{}", f, suffix);
             }
-            else if (std::isalpha(units.at(0)))
+            else if (std::isalpha(static_cast<unsigned char>(units.at(0))))
             {
                // dBZ, Kts, etc.
                hoverText = fmt::format("{} {}{}", f, units, suffix);