diff --git a/sorc/ncep_post.fd/CALVIS_GSD.f b/sorc/ncep_post.fd/CALVIS_GSD.f
index 351997399..c2795a6e5 100644
--- a/sorc/ncep_post.fd/CALVIS_GSD.f
+++ b/sorc/ncep_post.fd/CALVIS_GSD.f
@@ -99,13 +99,13 @@ SUBROUTINE CALVIS_GSD(CZEN,VIS)
       use vrbls2d, only: sno, si, ustar
       use vrbls3d, only: qqw, qqi, qqs, qqr, qqg, t, pmid, q, u, v, extcof55, aextc55
       use params_mod, only: h1, d608, rd, g
-      use ctlblk_mod, only: jm, im, jsta_2l, jend_2u, lm, modelname, spval,&
+      use ctlblk_mod, only: jm, im, jsta_2l, jend_2u, lm, modelname, spval, method_blsn,&
                                     ista_2l, iend_2u
 
       implicit none
 
       integer :: j, i, k, ll
-      integer :: method, method_blsn
+      integer :: method
       real :: tx, pol, esx, es, e
       REAL VIS(ista_2l:iend_2u,jsta_2l:jend_2u)
       REAL RHB(ista_2l:iend_2u,jsta_2l:jend_2u,LM)
@@ -142,7 +142,6 @@ SUBROUTINE CALVIS_GSD(CZEN,VIS)
 !                Aerosol method (2), 
 !                Smoke added to RH method for clear air  (3)
 !                   3 - option to add reducted visibility from smoke-based aerosols.
-      method_blsn = 1 ! 1 for 'on', 0 for 'off'
      
       CELKEL     = 273.15
       TICE       = CELKEL-10.
@@ -355,7 +354,7 @@ SUBROUTINE CALVIS_GSD(CZEN,VIS)
 ! Addition of attenuation from aerosols if option selected
         if(method == 2 .or. method == 3)then ! aerosol method
             BETAV = BETAV + aextc55(i,j,lm)*1000.
-            if(method_blsn .eq. 1) then ! BLSN method, updated 8 August 2022 by Tim Corrie
+            if(method_blsn) then ! BLSN method, updated 8 August 2022 by Tim Corrie
                 BETAV = BETAV + BETABLSN
             endif
         endif
diff --git a/sorc/ncep_post.fd/CTLBLK.f b/sorc/ncep_post.fd/CTLBLK.f
index 224742918..663a6d6eb 100644
--- a/sorc/ncep_post.fd/CTLBLK.f
+++ b/sorc/ncep_post.fd/CTLBLK.f
@@ -18,6 +18,7 @@
 !>  2023-04-04 | Li(Kate Zhang) | Add namelist optoin for CCPP-Chem (UFS-Chem) and 2D diag. output (d2d_chem) for GEFS-Aerosols and CCPP-Chem model.
 !>  2023-04-17 | Eric James | Adding 160 and 320 m above ground to HTFD for RRFS output.
 !>  2023-08-16 | Yali Mao   | Add gtg_on logical option
+!>  2023-11-24 | Eric James | Add method_blsn logical option
 !-----------------------------------------------------------------------
 !> @defgroup CTLBLK_mod Sets default parameters that are used throughout the UPP code
 !-----------------------------------------------------------------------
@@ -73,6 +74,7 @@ module CTLBLK_mod
   logical :: aqf_on        !< Turn on Air Quality Forecasting (CMAQ-based).
   logical :: slrutah_on    !< Calculate snow to liquid ratio (SLR) using method from University of Utah.
   logical :: gtg_on        !< Turn on GTG (Graphical Turbulence Guidance)
+  logical :: method_blsn   !< Turn on blowing snow effect on visibility diagnostic
 !
   logical :: SIGMA      !< No longer used/supported.
   logical :: RUN        !< No longer used/supported.
diff --git a/sorc/ncep_post.fd/WRFPOST.f b/sorc/ncep_post.fd/WRFPOST.f
index d2b0ef546..30ca7af17 100644
--- a/sorc/ncep_post.fd/WRFPOST.f
+++ b/sorc/ncep_post.fd/WRFPOST.f
@@ -127,7 +127,7 @@ PROGRAM WRFPOST
               mdl2agl_tim, mdl2std_tim, mdl2thandpv_tim, calrad_wcloud_tim,nasa_on,gccpp_on,         &
               fixed_tim, time_output, imin, surfce2_tim, komax, ivegsrc, d3d_on, gocart_on,rdaod,    &
               readxml_tim, spval, fullmodelname, submodelname, hyb_sigp, filenameflat, aqf_on,numx,  &
-              run_ifi_tim, slrutah_on, d2d_chem, gtg_on
+              run_ifi_tim, slrutah_on, d2d_chem, gtg_on, method_blsn
       use grib2_module,   only: gribit2,num_pset,nrecout,first_grbtbl,grib_info_finalize
       use upp_ifi_mod, only: write_ifi_debug_files
 !- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
@@ -153,7 +153,7 @@ PROGRAM WRFPOST
 !
       integer      :: kpo,kth,kpv
       real,dimension(komax) :: po,th,pv
-      namelist/nampgb/kpo,po,kth,th,kpv,pv,fileNameAER,d3d_on,gocart_on,gccpp_on, nasa_on,gtg_on,popascal &
+      namelist/nampgb/kpo,po,kth,th,kpv,pv,fileNameAER,d3d_on,gocart_on,gccpp_on, nasa_on,gtg_on,method_blsn,popascal &
                      ,hyb_sigp,rdaod,d2d_chem, aqf_on,slrutah_on, vtimeunits,numx,write_ifi_debug_files
       integer      :: itag_ierr
       namelist/model_inputs/fileName,IOFORM,grib,DateStr,MODELNAME,SUBMODELNAME &
@@ -261,6 +261,7 @@ PROGRAM WRFPOST
         aqf_on      = .false.
         slrutah_on  = .false.
         gtg_on   = .false.
+        method_blsn = .true.
         popascal    = .false.
         fileNameAER = ''
         rdaod       = .false.