diff --git a/tests/etopo1_oper_an_fc_O320.yml b/tests/etopo1_oper_an_fc_O320.yml
index 02bc9e47c..5fb504ba0 100644
--- a/tests/etopo1_oper_an_fc_O320.yml
+++ b/tests/etopo1_oper_an_fc_O320.yml
@@ -83,3 +83,36 @@ validation:
       maximum: 0.7470872982664355E+01
       relative_tolerance: 1.e-14
       hashes: ['0x401DE22C86F4741A']
+
+  single_precision:
+
+    # initial analysis time
+    - name: swh
+      time: 2022-12-31 12:00:00
+      average: 0.1334386110305786E+01
+      relative_tolerance: 1.e-6
+      hashes: ['0x3FF559A540000000']
+
+    # initial forecast time
+    - name: swh
+      time: 2023-01-01 00:00:00
+      average: 0.1522688865661621E+01
+      relative_tolerance: 1.e-6
+      hashes: ['0x3FF85CEF00000000']
+
+    # 6h into forcast
+    - name: swh
+      time: 2023-01-01 06:00:00
+      average: 0.1602301239967346E+01
+      relative_tolerance: 1.e-6
+      hashes: ['0x3FF9A306A0000000']
+    - name: swh
+      time: 2023-01-01 06:00:00
+      minimum: 0.1733699254691601E-01
+      relative_tolerance: 1.e-6
+      hashes: ['0x3F91C0C9E0000000']
+    - name: swh
+      time: 2023-01-01 06:00:00
+      maximum: 0.7470870018005371E+01
+      relative_tolerance: 1.e-6
+      hashes: ['0x401DE22BC0000000']