#include<bits/stdc++.h>
using namespace std;

#define int long long
#define MAXN 100005

int n,m,k,ise[MAXN],d[MAXN],dist[MAXN],del[MAXN],vis[MAXN];
vector< pair<int,int> > E[MAXN];
priority_queue<int> Q[MAXN];

inline void upd( int t , int x ){
	if( (int)( Q[t].size() ) <= d[t] ) Q[t].push( x );
	else if( x < Q[t].top() ) Q[t].pop(),Q[t].push( x );
}

int dfs( int x ){
	if( ise[x] ) return 0;
	if( vis[x] || del[x] ) return -1;
	if( (int)( Q[x].size() ) > d[x] ) return dist[x];
	vis[x] = 1;
	for( pair<int,int> p : E[x] ){
		int v = p.first,w = p.second;
		int tmp = dfs( v ); if( tmp == -1 ) continue;
		upd( x , tmp + w );
	}
	vis[x] = 0;
	if( (int)( Q[x].size() ) > d[x] ) return dist[x] = Q[x].top();
	else del[x] = 1; return -1;
}

inline void solve(){
	scanf("%lld%lld%lld",&n,&m,&k);
	for( int i = 1 ; i <= n ; i ++ ){
		dist[i] = -1,ise[i] = del[i] = vis[i] = 0;
		E[i].clear();
		while( !Q[i].empty() ) Q[i].pop();
	}
	for( int i = 1 ; i <= k ; i ++ ){
		int x; scanf("%lld",&x);
		ise[x] = 1;
	}
	for( int i = 1 ; i <= n ; i ++ ) scanf("%lld",&d[i]);
	for( int i = 1 ; i <= m ; i ++ ){
		int u,v,w; scanf("%lld%lld%lld",&u,&v,&w);
		E[u].emplace_back( make_pair( v , w ) );
		E[v].emplace_back( make_pair( u , w ) );
	}
	printf("%lld\n",dfs(1));
}

signed main(){
	int testcase; scanf("%lld",&testcase);
	while( testcase -- ) solve();
	return 0;
}