diff --git a/internal/parser/lexer.go b/internal/parser/lexer.go
index 5da8719..7ae7e3b 100644
--- a/internal/parser/lexer.go
+++ b/internal/parser/lexer.go
@@ -6,7 +6,7 @@ import (
 
 var lex = lexer.MustSimple([]lexer.SimpleRule{
 	{Name: "header", Pattern: `TAF (AMD|COR)? ?`},
-	{Name: "Remark", Pattern: `RMK .*`},
+	{Name: "Remark", Pattern: `RMK[^\n]*`},
 	{Name: "Number", Pattern: `\d+`},
 	{Name: "Modifier", Pattern: `[+-]|VC`},
 	{Name: "Prob", Pattern: "PROB"},
diff --git a/internal/parser/parser.go b/internal/parser/parser.go
index 73fcdb4..575e3e4 100644
--- a/internal/parser/parser.go
+++ b/internal/parser/parser.go
@@ -34,8 +34,8 @@ type ValidPair struct {
 
 type Probability struct {
 	Pos   lexer.Position
-	Value string `Prob @Number`
-	Time  string `(WS @Number)?`
+	Value string    `Prob @Number`
+	Valid ValidPair `(WS @@)?`
 }
 
 type WindSpeed struct {
diff --git a/taf.go b/taf.go
index 73098d0..2b7dea5 100644
--- a/taf.go
+++ b/taf.go
@@ -322,7 +322,7 @@ func DecodeWithOptions(r io.Reader, opts Options) (*Forecast, error) {
 		case item.Probability != nil:
 			// If the time is empty, this probability belongs to the
 			// next change.
-			if item.Probability.Time == "" {
+			if item.Probability.Valid.Start == "" {
 				prob, err := strconv.Atoi(item.Probability.Value)
 				if err != nil {
 					return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
@@ -332,34 +332,11 @@ func DecodeWithOptions(r io.Reader, opts Options) (*Forecast, error) {
 			} else {
 				pr := &Probability{}
 
-				// The probability time string must have 4 characters,
-				// 2 for starting time and 2 for ending time
-				if len(item.Probability.Time) < 4 {
-					return nil, participle.Errorf(item.Probability.Pos, "prob: invalid time %q", item.Probability.Time)
-				}
-
-				startStr := item.Probability.Time[:2]
-				endStr := item.Probability.Time[2:]
-
-				start, err := strconv.Atoi(startStr)
+				pr.Valid, err = parseValid(&item.Probability.Valid, opts.Month, opts.Year)
 				if err != nil {
 					return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
 				}
 
-				end, err := strconv.Atoi(endStr)
-				if err != nil {
-					return nil, participle.Errorf(item.Probability.Pos, "prob: %s", err)
-				}
-
-				t := fc.PublishTime
-				pr.Valid = ValidPair{
-					From: time.Date(t.Year(), t.Month(), t.Day(), start, 0, 0, 0, time.UTC),
-					To:   time.Date(t.Year(), t.Month(), t.Day(), end, 0, 0, 0, time.UTC),
-				}
-
-				// Get the duration by subtracting the from time from the to time
-				pr.Valid.Duration = pr.Valid.To.Sub(pr.Valid.From)
-
 				fc.Probabilities = append(fc.Probabilities, pr)
 
 				// Set out to the probability value so that future mutations
@@ -367,7 +344,7 @@ func DecodeWithOptions(r io.Reader, opts Options) (*Forecast, error) {
 				out = reflect.ValueOf(pr).Elem()
 			}
 		case item.Remark != nil:
-			fc.Remark = *item.Remark
+			fc.Remark = strings.TrimSpace(strings.TrimPrefix(*item.Remark, "RMK"))
 		}
 	}