diff --git a/edexOsgi/com.raytheon.edex.plugin.grib/utility/common_static/base/grid/datasetInfo/gribDatasets_NCEP-7.xml b/edexOsgi/com.raytheon.edex.plugin.grib/utility/common_static/base/grid/datasetInfo/gribDatasets_NCEP-7.xml
index 9fa4326ee6..8c5dc96f89 100644
--- a/edexOsgi/com.raytheon.edex.plugin.grib/utility/common_static/base/grid/datasetInfo/gribDatasets_NCEP-7.xml
+++ b/edexOsgi/com.raytheon.edex.plugin.grib/utility/common_static/base/grid/datasetInfo/gribDatasets_NCEP-7.xml
@@ -719,7 +719,7 @@
     <info>
         <title>Guam-RTMA</title>
         <datasetId>Guam-RTMA</datasetId>
-        <dt>1</dt>
+        <dt>3</dt>
     </info>
     <info>
         <title>RTG-SST-HR-Analysis</title>
diff --git a/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MnT.xml b/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MnT.xml
index 575f77b1b8..2e168bab8b 100644
--- a/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MnT.xml
+++ b/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MnT.xml
@@ -3,9 +3,42 @@
   <Method levels="Surface" name="Alias">
     <Field abbreviation="MnT" level="2FHAG" />
   </Method>
-  <Method levels="Surface" models="RTMA" name="Min">
-    <Field abbreviation="T24hr" />
-  </Method>
+    <Method name="Min" levels="Surface" models="RTMA25 AK-RTMA AK-RTMA3 HI-RTMA PR-RTMA URMA25" dtime="true">
+        <Field abbreviation="T" timeShift="0"/>
+        <Field abbreviation="T" timeShift="-3600"/>
+        <Field abbreviation="T" timeShift="-7200"/>
+        <Field abbreviation="T" timeShift="-10800"/>
+        <Field abbreviation="T" timeShift="-14400"/>
+        <Field abbreviation="T" timeShift="-18000"/>
+        <Field abbreviation="T" timeShift="-21600"/>
+        <Field abbreviation="T" timeShift="-25200"/>
+        <Field abbreviation="T" timeShift="-28800"/>
+        <Field abbreviation="T" timeShift="-32400"/>
+        <Field abbreviation="T" timeShift="-36000"/>
+        <Field abbreviation="T" timeShift="-39600"/>
+        <Field abbreviation="T" timeShift="-43200"/>
+        <Field abbreviation="T" timeShift="-46800"/>
+        <Field abbreviation="T" timeShift="-50400"/>
+        <Field abbreviation="T" timeShift="-54000"/>
+        <Field abbreviation="T" timeShift="-57600"/>
+        <Field abbreviation="T" timeShift="-61200"/>
+        <Field abbreviation="T" timeShift="-64800"/>
+        <Field abbreviation="T" timeShift="-68400"/>
+        <Field abbreviation="T" timeShift="-72000"/>
+        <Field abbreviation="T" timeShift="-75600"/>
+        <Field abbreviation="T" timeShift="-79200"/>
+        <Field abbreviation="T" timeShift="-82800"/>
+    </Method>
+    <Method name="Min" levels="Surface" models="Guam-RTMA" dtime="true">
+        <Field abbreviation="T" timeShift="0"/>
+        <Field abbreviation="T" timeShift="-10800"/>
+        <Field abbreviation="T" timeShift="-21600"/>
+        <Field abbreviation="T" timeShift="-32400"/>
+        <Field abbreviation="T" timeShift="-43200"/>
+        <Field abbreviation="T" timeShift="-54000"/>
+        <Field abbreviation="T" timeShift="-64800"/>
+        <Field abbreviation="T" timeShift="-75600"/>
+    </Method>
   <Method levels="Surface" name="Min">
     <Field abbreviation="T24hr" />
   </Method>
diff --git a/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MxT.xml b/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MxT.xml
index 38fc423ff6..bb8c6fade2 100644
--- a/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MxT.xml
+++ b/edexOsgi/com.raytheon.uf.common.dataplugin.grid/utility/common_static/base/derivedParameters/definitions/MxT.xml
@@ -22,8 +22,41 @@
     <Method name="Alias" levels="Surface">
     	<Field abbreviation="MxT" level="2FHAG"/>
     </Method>
-    <Method name="Max" levels="Surface" models="RTMA25">
-    	<Field abbreviation="T24hr"/>
+    <Method name="Max" levels="Surface" models="RTMA25 AK-RTMA AK-RTMA3 HI-RTMA PR-RTMA URMA25" dtime="true">
+        <Field abbreviation="T" timeShift="0"/>
+        <Field abbreviation="T" timeShift="-3600"/>
+        <Field abbreviation="T" timeShift="-7200"/>
+        <Field abbreviation="T" timeShift="-10800"/>
+        <Field abbreviation="T" timeShift="-14400"/>
+        <Field abbreviation="T" timeShift="-18000"/>
+        <Field abbreviation="T" timeShift="-21600"/>
+        <Field abbreviation="T" timeShift="-25200"/>
+        <Field abbreviation="T" timeShift="-28800"/>
+        <Field abbreviation="T" timeShift="-32400"/>
+        <Field abbreviation="T" timeShift="-36000"/>
+        <Field abbreviation="T" timeShift="-39600"/>
+        <Field abbreviation="T" timeShift="-43200"/>
+        <Field abbreviation="T" timeShift="-46800"/>
+        <Field abbreviation="T" timeShift="-50400"/>
+        <Field abbreviation="T" timeShift="-54000"/>
+        <Field abbreviation="T" timeShift="-57600"/>
+        <Field abbreviation="T" timeShift="-61200"/>
+        <Field abbreviation="T" timeShift="-64800"/>
+        <Field abbreviation="T" timeShift="-68400"/>
+        <Field abbreviation="T" timeShift="-72000"/>
+        <Field abbreviation="T" timeShift="-75600"/>
+        <Field abbreviation="T" timeShift="-79200"/>
+        <Field abbreviation="T" timeShift="-82800"/>
+    </Method>
+    <Method name="Max" levels="Surface" models="Guam-RTMA" dtime="true">
+        <Field abbreviation="T" timeShift="0"/>
+        <Field abbreviation="T" timeShift="-10800"/>
+        <Field abbreviation="T" timeShift="-21600"/>
+        <Field abbreviation="T" timeShift="-32400"/>
+        <Field abbreviation="T" timeShift="-43200"/>
+        <Field abbreviation="T" timeShift="-54000"/>
+        <Field abbreviation="T" timeShift="-64800"/>
+        <Field abbreviation="T" timeShift="-75600"/>
     </Method>
      <Method name="Max" levels="Surface">
     	<Field abbreviation="T24hr"/>
diff --git a/edexOsgi/com.raytheon.uf.edex.plugin.grid/utility/common_static/base/purge/gridPurgeRules.xml b/edexOsgi/com.raytheon.uf.edex.plugin.grid/utility/common_static/base/purge/gridPurgeRules.xml
index 7bb52b00f2..e2ecede17a 100644
--- a/edexOsgi/com.raytheon.uf.edex.plugin.grid/utility/common_static/base/purge/gridPurgeRules.xml
+++ b/edexOsgi/com.raytheon.uf.edex.plugin.grid/utility/common_static/base/purge/gridPurgeRules.xml
@@ -250,12 +250,32 @@
 		<versionsToKeep>24</versionsToKeep>
 		<modTimeToWait>00-00:15:00</modTimeToWait>
 	</rule>
+    <rule>
+        <keyValue>AK-RTMA</keyValue>
+        <versionsToKeep>24</versionsToKeep>
+        <modTimeToWait>00-00:15:00</modTimeToWait>
+    </rule>
 	<!-- Purge rule for AK-RTMA-3KM analysis -->
 	<rule>
 		<keyValue>AK-RTMA3</keyValue>
 		<versionsToKeep>24</versionsToKeep>
 		<modTimeToWait>00-00:15:00</modTimeToWait>
 	</rule>
+    <rule>
+        <keyValue>HI-RTMA</keyValue>
+        <versionsToKeep>24</versionsToKeep>
+        <modTimeToWait>00-00:15:00</modTimeToWait>
+    </rule>
+    <rule>
+        <keyValue>PR-RTMA</keyValue>
+        <versionsToKeep>24</versionsToKeep>
+        <modTimeToWait>00-00:15:00</modTimeToWait>
+    </rule>
+    <rule>
+        <keyValue>Guam-RTMA</keyValue>
+        <versionsToKeep>8</versionsToKeep>
+        <modTimeToWait>00-00:15:00</modTimeToWait>
+    </rule>
 	<!-- Purge rule for the SREF (SREF212) model -->
 	<rule>
 		<keyValue>SREF212</keyValue>
@@ -358,11 +378,6 @@
 		<versionsToKeep>2</versionsToKeep>
 		<modTimeToWait>00-00:15:00</modTimeToWait>
 	</rule>
-    <!-- Purge rule for the HI-RTMA (HI-RTMA) model -->
-    <rule>
-        <keyValue>HI_RTMA</keyValue>
-        <versionsToKeep>24</versionsToKeep>
-    </rule>
         <!-- Purge rule for the Hawaii 2.5km MOSGuide model -->
         <rule>
                 <keyValue>MOSGuide-HI</keyValue>