diff --git a/src/metkit/mars2grib/backend/concepts/level/levelEncoding.h b/src/metkit/mars2grib/backend/concepts/level/levelEncoding.h
index 3d004351..b06b4427 100644
--- a/src/metkit/mars2grib/backend/concepts/level/levelEncoding.h
+++ b/src/metkit/mars2grib/backend/concepts/level/levelEncoding.h
@@ -107,7 +107,7 @@ constexpr bool needLevel() {
                   Variant == LevelType::Hybrid || Variant == LevelType::IsobaricInHpa ||
                   Variant == LevelType::IsobaricInPa || Variant == LevelType::Isothermal ||
                   Variant == LevelType::PotentialVorticity || Variant == LevelType::Theta ||
-                  Variant == LevelType::OceanModel) {
+                  Variant == LevelType::OceanModel || Variant == LevelType::FlightLevel) {
         return true;
     }
     else {
diff --git a/src/metkit/mars2grib/backend/concepts/level/levelEnum.h b/src/metkit/mars2grib/backend/concepts/level/levelEnum.h
index c88dc368..a0e54403 100644
--- a/src/metkit/mars2grib/backend/concepts/level/levelEnum.h
+++ b/src/metkit/mars2grib/backend/concepts/level/levelEnum.h
@@ -129,6 +129,7 @@ enum class LevelType : std::size_t {
     HeightAboveSeaAt2M,
     HeightAboveGroundAt10M,
     HeightAboveGroundAt2M,
+    FlightLevel,
     Default
 };
 
@@ -145,20 +146,19 @@ enum class LevelType : std::size_t {
 /// The order of this list must match the intended iteration order
 /// for registry construction and diagnostics.
 ///
-using LevelList =
-    ValueList<LevelType::Surface, LevelType::EntireAtmosphere, LevelType::EntireLake, LevelType::CloudBase,
-              LevelType::Tropopause, LevelType::NominalTop, LevelType::MostUnstableParcel, LevelType::MixedLayerParcel,
-              LevelType::Isothermal, LevelType::IsobaricInPa, LevelType::IsobaricInHpa, LevelType::LowCloudLayer,
-              LevelType::MediumCloudLayer, LevelType::HighCloudLayer, LevelType::MeanSea, LevelType::HeightAboveSea,
-              LevelType::HeightAboveGround, LevelType::Hybrid, LevelType::Theta, LevelType::PotentialVorticity,
-              LevelType::SnowLayer, LevelType::SoilLayer, LevelType::SeaIceLayer, LevelType::OceanSurface,
-              LevelType::DepthBelowSeaLayer, LevelType::OceanSurfaceToBottom, LevelType::LakeBottom,
-              LevelType::MixingLayer, LevelType::OceanModel, LevelType::OceanModelLayer,
-              LevelType::MixedLayerDepthByDensity, LevelType::MixedLayerDepthByTemperature,
-              LevelType::SnowLayerOverIceOnWater, LevelType::IceTopOnWater, LevelType::IceLayerOnWater,
-              LevelType::EntireMeltPond, LevelType::WaterSurfaceToIsothermalOceanLayer, LevelType::AbstractSingleLevel,
-              LevelType::AbstractMultipleLevel, LevelType::HeightAboveSeaAt10M, LevelType::HeightAboveSeaAt2M,
-              LevelType::HeightAboveGroundAt10M, LevelType::HeightAboveGroundAt2M, LevelType::Default>;
+using LevelList = ValueList<
+    LevelType::Surface, LevelType::EntireAtmosphere, LevelType::EntireLake, LevelType::CloudBase, LevelType::Tropopause,
+    LevelType::NominalTop, LevelType::MostUnstableParcel, LevelType::MixedLayerParcel, LevelType::Isothermal,
+    LevelType::IsobaricInPa, LevelType::IsobaricInHpa, LevelType::LowCloudLayer, LevelType::MediumCloudLayer,
+    LevelType::HighCloudLayer, LevelType::MeanSea, LevelType::HeightAboveSea, LevelType::HeightAboveGround,
+    LevelType::Hybrid, LevelType::Theta, LevelType::PotentialVorticity, LevelType::SnowLayer, LevelType::SoilLayer,
+    LevelType::SeaIceLayer, LevelType::OceanSurface, LevelType::DepthBelowSeaLayer, LevelType::OceanSurfaceToBottom,
+    LevelType::LakeBottom, LevelType::MixingLayer, LevelType::OceanModel, LevelType::OceanModelLayer,
+    LevelType::MixedLayerDepthByDensity, LevelType::MixedLayerDepthByTemperature, LevelType::SnowLayerOverIceOnWater,
+    LevelType::IceTopOnWater, LevelType::IceLayerOnWater, LevelType::EntireMeltPond,
+    LevelType::WaterSurfaceToIsothermalOceanLayer, LevelType::AbstractSingleLevel, LevelType::AbstractMultipleLevel,
+    LevelType::HeightAboveSeaAt10M, LevelType::HeightAboveSeaAt2M, LevelType::HeightAboveGroundAt10M,
+    LevelType::HeightAboveGroundAt2M, LevelType::FlightLevel, LevelType::Default>;
 
 
 ///
@@ -231,6 +231,7 @@ DEF(LevelType::HeightAboveSeaAt10M, "heightAboveSeaAt10m");
 DEF(LevelType::HeightAboveSeaAt2M, "heightAboveSeaAt2m");
 DEF(LevelType::HeightAboveGroundAt10M, "heightAboveGroundAt10m");
 DEF(LevelType::HeightAboveGroundAt2M, "heightAboveGroundAt2m");
+DEF(LevelType::FlightLevel, "flightLevel");
 DEF(LevelType::Default, "default");
 
 #undef DEF
diff --git a/src/metkit/mars2grib/backend/concepts/level/levelMatcher.h b/src/metkit/mars2grib/backend/concepts/level/levelMatcher.h
index 3d23158c..83b563c4 100644
--- a/src/metkit/mars2grib/backend/concepts/level/levelMatcher.h
+++ b/src/metkit/mars2grib/backend/concepts/level/levelMatcher.h
@@ -189,6 +189,18 @@ inline std::size_t matchPL(const long param, const long level) {
         "No mapping exists for param \"" + std::to_string(param) + "\" on levtype PL", Here());
 }
 
+inline std::size_t matchFL(const long param) {
+    using metkit::mars2grib::util::param_matcher::matchAny;
+    using metkit::mars2grib::util::param_matcher::range;
+
+    if (matchAny(param, 260290)) {
+        return static_cast<std::size_t>(LevelType::FlightLevel);
+    }
+
+    throw utils::exceptions::Mars2GribMatcherException(
+        "No mapping exists for param \"" + std::to_string(param) + "\" on levtype FL", Here());
+}
+
 inline std::size_t matchPT(const long param) {
     using metkit::mars2grib::util::param_matcher::matchAny;
     using metkit::mars2grib::util::param_matcher::range;
@@ -332,6 +344,9 @@ std::size_t levelMatcher(const MarsDict_t& mars, const OptDict_t& opt) {
         const auto level = get_or_throw<long>(mars, "levelist");
         return impl::matchPL(param, level);
     }
+    if (levtype == "fl") {
+        return impl::matchFL(param);
+    }
     if (levtype == "pt") {
         return impl::matchPT(param);
     }
diff --git a/src/metkit/mars2grib/backend/deductions/significanceOfReferenceTime.h b/src/metkit/mars2grib/backend/deductions/significanceOfReferenceTime.h
index ecbf50c2..8ef181e7 100644
--- a/src/metkit/mars2grib/backend/deductions/significanceOfReferenceTime.h
+++ b/src/metkit/mars2grib/backend/deductions/significanceOfReferenceTime.h
@@ -118,10 +118,10 @@ tables::SignificanceOfReferenceTime resolve_SignificanceOfReferenceTime_or_throw
         constexpr std::array<std::string_view, 17> analysisTypes = {
             {"an", "ia", "oi", "3v", "3g", "4g", "ea", "pa", "tpa", "ga", "gai", "ai", "af", "ab", "oai", "ga", "gai"}};
 
-        constexpr std::array<std::string_view, 33> forecastTypes = {
-            {"fc",     "cf",    "pf",    "cm",      "fp",  "em",  "ep",   "es",   "fa",     "efi", "efic",
-             "bf",     "cd",    "wem",   "wes",     "cr",  "ses", "taem", "taes", "sg",     "sf",  "if",
-             "fcmean", "fcmax", "fcmin", "fcstdev", "ssd", "tf",  "bf",   "cd",   "hcmean", "s3",  "si"}};
+        constexpr std::array<std::string_view, 35> forecastTypes = {
+            {"fc",    "cf",      "pf",  "cm", "fp",  "em",   "ep",     "es", "fa", "efi", "efic",   "bf",
+             "cd",    "wem",     "wes", "cr", "ses", "taem", "taes",   "sg", "sf", "if",  "fcmean", "fcmax",
+             "fcmin", "fcstdev", "ssd", "tf", "bf",  "cd",   "hcmean", "s3", "si", "gbf", "gwt"}};
 
         constexpr std::array<std::string_view, 4> startOfDataAssimilationTypes = {{"4i", "4v", "me", "eme"}};