Alert archive / North Dakota / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 366

September 3, 201826 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 3, 2018, 4:44 PM MDT for 26 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 3, 2018, 4:44 PM MDT (22:44 UTC)
Expired
Sep 3, 2018, 11:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 26 counties

Adams County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Burleigh County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND

The radar

The Minot AFB radar (KMBX), 100 km from the middle of the area, began a volume at 22:47 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
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 3, 5:55 PM MDTSevere Thunderstorm WarningBISBillings50 min
Sep 3, 6:10 PM MDTSevere Thunderstorm WarningBISBillings, Dunn, Stark65 min
Sep 3, 6:16 PM MDTSevere Thunderstorm WarningBISBillings, Dunn59 min
Sep 3, 6:22 PM MDTTornado Warning Tornado observedBISBowman23 min
Sep 3, 6:29 PM MDTSevere Thunderstorm WarningBISBillings, Slope, Stark61 min
Sep 3, 6:30 PM MDTSevere Thunderstorm WarningBISBowman, Slope28 min
Sep 3, 6:47 PM MDTSevere Thunderstorm WarningBISBowman58 min
Sep 3, 6:58 PM MDTSevere Thunderstorm WarningBISBillings, Dunn, Stark62 min
Sep 3, 7:09 PM MDTSevere Thunderstorm WarningBISMountrail, Ward66 min
Sep 3, 7:40 PM MDTSevere Thunderstorm WarningBISBillings, Stark50 min
Sep 3, 8:17 PM MDTSevere Thunderstorm WarningBISBottineau, Renville43 min
Sep 3, 8:22 PM MDTSevere Thunderstorm WarningBISBurke, Renville, Ward38 min
Sep 3, 8:23 PM MDTSevere Thunderstorm WarningBISDunn, Stark52 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.7 hours before the alert went out and 139 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, Bismarck Municip, ND at 12:00Z on 2018-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Bismarck Municip, ND at 12:00Z on 2018-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2096 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 3, 4:00 PM MDTMesoscale DiscussionSPCAdams, Billings, Bowman, Burke, Dunn, Golden Valley and 10 more90 min

Nearby

Severe Thunderstorm Watches in North Dakota, 2018Every severe thunderstorm watch in 2018

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.