diff --git a/wxdata/include/scwx/types/iem_types.hpp b/wxdata/include/scwx/types/iem_types.hpp
new file mode 100644
index 00000000..ee461c36
--- /dev/null
+++ b/wxdata/include/scwx/types/iem_types.hpp
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <string>
+#include <variant>
+
+#include <boost/json/value.hpp>
+
+namespace scwx::types::iem
+{
+
+/**
+ * @brief AFOS Entry object
+ *
+ * <https://mesonet.agron.iastate.edu/api/1/docs#/nws/service_nws_afos_list__fmt__get>
+ */
+struct AfosEntry
+{
+   std::int64_t index_ {};
+   std::string  entered_ {};
+   std::string  pil_ {};
+   std::string  productId_ {};
+   std::string  cccc_ {};
+   std::int64_t count_ {};
+   std::string  link_ {};
+   std::string  textLink_ {};
+};
+
+/**
+ * @brief AFOS List object
+ *
+ * <https://mesonet.agron.iastate.edu/api/1/docs#/nws/service_nws_afos_list__fmt__get>
+ */
+struct AfosList
+{
+   std::vector<AfosEntry> data_ {};
+};
+
+/**
+ * @brief Bad Request (400) object
+ */
+struct BadRequest
+{
+   std::string detail_ {};
+};
+
+/**
+ * @brief Validation Error (422) object
+ */
+struct ValidationError
+{
+   struct Detail
+   {
+      std::string                                          type_ {};
+      std::vector<std::variant<std::int64_t, std::string>> loc_ {};
+      std::string                                          msg_ {};
+      std::string                                          input_ {};
+      struct Context
+      {
+         std::string error_ {};
+      } ctx_;
+   };
+
+   std::vector<Detail> detail_ {};
+};
+
+AfosList        tag_invoke(boost::json::value_to_tag<AfosList>,
+                           const boost::json::value& jv);
+BadRequest      tag_invoke(boost::json::value_to_tag<BadRequest>,
+                           const boost::json::value& jv);
+ValidationError tag_invoke(boost::json::value_to_tag<ValidationError>,
+                           const boost::json::value& jv);
+
+} // namespace scwx::types::iem
diff --git a/wxdata/source/scwx/types/iem_types.cpp b/wxdata/source/scwx/types/iem_types.cpp
new file mode 100644
index 00000000..c1921ede
--- /dev/null
+++ b/wxdata/source/scwx/types/iem_types.cpp
@@ -0,0 +1,103 @@
+#include <scwx/types/iem_types.hpp>
+
+#include <boost/json/value_to.hpp>
+
+namespace scwx::types::iem
+{
+
+AfosEntry tag_invoke(boost::json::value_to_tag<AfosEntry>,
+                     const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   AfosEntry entry {};
+
+   // Required parameters
+   entry.index_     = jo.at("index").as_int64();
+   entry.entered_   = jo.at("entered").as_string();
+   entry.pil_       = jo.at("pil").as_string();
+   entry.productId_ = jo.at("product_id").as_string();
+   entry.cccc_      = jo.at("cccc").as_string();
+   entry.count_     = jo.at("count").as_int64();
+   entry.link_      = jo.at("link").as_string();
+   entry.textLink_  = jo.at("text_link").as_string();
+
+   return entry;
+}
+
+AfosList tag_invoke(boost::json::value_to_tag<AfosList>,
+                    const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   AfosList list {};
+
+   // Required parameters
+   list.data_ = boost::json::value_to<std::vector<AfosEntry>>(jo.at("data"));
+
+   return list;
+}
+
+BadRequest tag_invoke(boost::json::value_to_tag<BadRequest>,
+                      const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   BadRequest badRequest {};
+
+   // Required parameters
+   badRequest.detail_ = jo.at("detail").as_string();
+
+   return badRequest;
+}
+
+ValidationError::Detail::Context
+tag_invoke(boost::json::value_to_tag<ValidationError::Detail::Context>,
+           const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   ValidationError::Detail::Context ctx {};
+
+   // Required parameters
+   ctx.error_ = jo.at("error").as_string();
+
+   return ctx;
+}
+
+ValidationError::Detail
+tag_invoke(boost::json::value_to_tag<ValidationError::Detail>,
+           const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   ValidationError::Detail detail {};
+
+   // Required parameters
+   detail.type_ = jo.at("type").as_string();
+   detail.loc_  = boost::json::value_to<
+       std::vector<std::variant<std::int64_t, std::string>>>(jo.at("loc"));
+   detail.msg_   = jo.at("msg").as_string();
+   detail.input_ = jo.at("input").as_string();
+
+   detail.ctx_ =
+      boost::json::value_to<ValidationError::Detail::Context>(jo.at("ctx"));
+
+   return detail;
+}
+
+ValidationError tag_invoke(boost::json::value_to_tag<ValidationError>,
+                           const boost::json::value& jv)
+{
+   auto& jo = jv.as_object();
+
+   ValidationError error {};
+
+   // Required parameters
+   error.detail_ = boost::json::value_to<std::vector<ValidationError::Detail>>(
+      jo.at("detail"));
+
+   return error;
+}
+
+} // namespace scwx::types::iem
diff --git a/wxdata/wxdata.cmake b/wxdata/wxdata.cmake
index 4b08ad19..92de3bf0 100644
--- a/wxdata/wxdata.cmake
+++ b/wxdata/wxdata.cmake
@@ -72,6 +72,8 @@ set(SRC_PROVIDER source/scwx/provider/aws_level2_data_provider.cpp
                  source/scwx/provider/nexrad_data_provider.cpp
                  source/scwx/provider/nexrad_data_provider_factory.cpp
                  source/scwx/provider/warnings_provider.cpp)
+set(HDR_TYPES include/scwx/types/iem_types.hpp)
+set(SRC_TYPES source/scwx/types/iem_types.cpp)
 set(HDR_UTIL include/scwx/util/digest.hpp
              include/scwx/util/enum.hpp
              include/scwx/util/environment.hpp
@@ -228,6 +230,8 @@ add_library(wxdata OBJECT ${HDR_AWIPS}
                           ${SRC_NETWORK}
                           ${HDR_PROVIDER}
                           ${SRC_PROVIDER}
+                          ${HDR_TYPES}
+                          ${SRC_TYPES}
                           ${HDR_UTIL}
                           ${SRC_UTIL}
                           ${HDR_WSR88D}
@@ -248,6 +252,8 @@ source_group("Header Files\\network"     FILES ${HDR_NETWORK})
 source_group("Source Files\\network"     FILES ${SRC_NETWORK})
 source_group("Header Files\\provider"    FILES ${HDR_PROVIDER})
 source_group("Source Files\\provider"    FILES ${SRC_PROVIDER})
+source_group("Header Files\\types"       FILES ${HDR_TYPES})
+source_group("Source Files\\types"       FILES ${SRC_TYPES})
 source_group("Header Files\\util"        FILES ${HDR_UTIL})
 source_group("Source Files\\util"        FILES ${SRC_UTIL})
 source_group("Header Files\\wsr88d"      FILES ${HDR_WSR88D})