diff --git a/model/src/w3ounfmetamd.F90 b/model/src/w3ounfmetamd.F90
index fd00c7bb37..44704c375e 100644
--- a/model/src/w3ounfmetamd.F90
+++ b/model/src/w3ounfmetamd.F90
@@ -2638,8 +2638,8 @@ SUBROUTINE DEFAULT_META()
     !META(1)%VARNS='air_sea_temperature_difference'
     META(1)%VARNS=''
     META(1)%VARNG='air_sea_temperature_difference'
-    META(1)%VMIN = 0
-    META(1)%VMAX = 400
+    META(1)%VMIN = -200.0
+    META(1)%VMAX = 200.0
     ! IFI=1, IFJ=5, WLV
     META => GROUP(1)%FIELD(5)%META
     META(1)%FSC    = 0.01
diff --git a/model/src/w3src4md.F90 b/model/src/w3src4md.F90
index a8698d1d21..e2bf12c9a1 100644
--- a/model/src/w3src4md.F90
+++ b/model/src/w3src4md.F90
@@ -666,8 +666,16 @@ SUBROUTINE W3SIN4 (A, CG, K, U, USTAR, DRAT, AS, USDIR, Z0, CD,    &
     ! I got it from, maybe just made up from drag law ...
     !
 #ifdef W3_STAB3
-    Usigma=MAX(0.,-0.025*AS)
+    IF ( ISNAN(AS) ) THEN
+      ! AS is typically NaN on land and can propagate into the domain by interpolation
+      Usigma = 0.
+    ELSE
+      Usigma = MAX(0.,-0.025*AS)
+    END IF
     USTARsigma=(1.0+U/(10.+U))*Usigma
+#endif
+#ifdef W3_T
+    WRITE (NDST,9003) AS, Usigma, USTARsigma, U
 #endif
     UST=USTAR
     ISTAB=3
@@ -678,6 +686,9 @@ SUBROUTINE W3SIN4 (A, CG, K, U, USTAR, DRAT, AS, USDIR, Z0, CD,    &
 #endif
       TAUX = UST**2* COS(USDIR)
       TAUY = UST**2* SIN(USDIR)
+#ifdef W3_T
+      WRITE (NDST,9001) ISTAB, TAUX, TAUY, UST
+#endif
       !
       ! Loop over the resolved part of the spectrum
       !
@@ -788,6 +799,9 @@ SUBROUTINE W3SIN4 (A, CG, K, U, USTAR, DRAT, AS, USDIR, Z0, CD,    &
     YSTRESS=0.5*(STRESSSTAB(1,2)+STRESSSTAB(2,2))
     TAUWNX=0.5*(STRESSSTABN(1,1)+STRESSSTABN(2,1))
     TAUWNY=0.5*(STRESSSTABN(1,2)+STRESSSTABN(2,2))
+#endif
+#ifdef W3_T
+    WRITE (NDST,9002) SUM(D), SUM(A), XSTRESS, YSTRESS, TAUWNX, TAUWNY
 #endif
     S = D * A
     !
@@ -868,6 +882,21 @@ SUBROUTINE W3SIN4 (A, CG, K, U, USTAR, DRAT, AS, USDIR, Z0, CD,    &
     !
 #ifdef W3_T
 9000 FORMAT (' TEST W3SIN4 : COMMON FACT.: ',3E10.3)
+9001 FORMAT (' TEST W3SIN4 : ISTAB      :',I2/                    &
+             '               TAUX       :',E12.3/                 &
+             '               TAUY       :',E12.3/                 &
+             '               UST        :',E12.3)
+9002 FORMAT (' TEST W3SIN4 : SUM(D)     :',E12.3/                 &
+             '               SUM(A)     :',E12.3/                 &
+             '               STRESSX    :',E12.3/                 &
+             '               STRESSY    :',E12.3/                 &
+             '               TAUWNX     :',E12.3/                 &
+             '               TAUWNY     :',E12.3)
+9003 FORMAT (' TEST W3SIN4 : AS         :',F8.4/                  &
+             '               Usigma     :',E12.3/                 &
+             '               USTARsigma :',E12.3/                 &
+             '               U          :',E12.3)
+
 #endif
     !/
     !/ End of W3SIN4 ----------------------------------------------------- /