Alert archive / North Dakota / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 438

July 24, 20148 counties in Montana; 19 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2014, 2:27 AM MDT for 8 counties in Montana; 19 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 24, 2014, 2:27 AM MDT (08:27 UTC)
Expired
Jul 24, 2014, 8:47 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 27 counties

Daniels County, MT, Dawson County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Renville County, ND, Sheridan County, ND, Stark County, ND, Ward County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 200 km from the middle of the area, began a volume at 08:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 24, 2:36 AM MDTSevere Thunderstorm WarningGGWDawson, Garfield, McCone, Prairie54 min
Jul 24, 2:42 AM MDTSevere Thunderstorm WarningGGWDaniels, Roosevelt, Valley63 min
Jul 24, 3:14 AM MDTSevere Thunderstorm WarningGGWDaniels, Dawson, McCone, Richland, Roosevelt, Sheridan61 min
Jul 24, 4:08 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan22 min
Jul 24, 4:23 AM MDTSevere Thunderstorm WarningBISMcKenzie, Williams52 min
Jul 24, 5:12 AM MDTSevere Thunderstorm WarningBISMcKenzie48 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 8.5 hours before the alert went out and 198 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 00:00Z on 2014-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 987 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 00:00Z on 2014-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
987 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
2178 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
252 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 23, 6:58 PM MDTMesoscale DiscussionSPCFlathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more92 min
Jul 23, 7:52 PM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Fergus, Garfield, Golden Valley and 12 more113 min
Jul 23, 8:28 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River92 min
Jul 23, 8:31 PM MDTSevere Thunderstorm WatchSPCBlaine, Broadwater, Cascade, Chouteau, Fergus, Garfield and 13 more6 hr
Jul 23, 10:52 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River83 min
Jul 24, 1:41 AM MDTMesoscale DiscussionSPCDaniels, Garfield, McCone, Phillips, Richland, Roosevelt and 2 more2 hr
Jul 24, 1:50 PM MDTMesoscale DiscussionSPCBlaine, Daniels, Dawson, Fergus, Garfield, Hill and 7 more55 min
Jul 24, 2:54 PM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, Garfield, McCone, Phillips, Richland and 4 more6 hr
Jul 24, 3:07 PM MDTMesoscale DiscussionSPCBig Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more53 min
Jul 24, 4:53 PM MDTMesoscale DiscussionSPCCarter, Custer, Daniels, Dawson, Fallon, Garfield and 9 more97 min
Jul 24, 5:47 AM MDTMesoscale DiscussionSPCBillings, Bottineau, Burke, Burleigh, Dunn, McHenry and 9 more118 min
Jul 24, 10:06 AM MDTMesoscale DiscussionSPCDickey, Richland, Sargent84 min

Nearby

Severe Thunderstorm Watches in North Dakota, 2014Severe Thunderstorm Watches in Montana, 2014Every severe thunderstorm watch in 2014

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.