Alert archive / North Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 104, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at Jul 16, 2021, 8:57 PM CDT for Mercer County, Morton County, Stark County, North Dakota. It was in force for 33 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 16, 2021, 8:57 PM CDT (01:57 UTC)
- Expired
- Jul 16, 2021, 9:30 PM CDT
- In force
- 33 min
- Issued by
- NWS Bismarck, ND
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Mercer County, ND, Morton County, ND, Stark County, ND
The radar
The Bismarck radar (KBIS), 99 km from the middle of the area, began a volume at 01:57 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 16, 9:08 PM CDT | HAIL 1.75 | 7 Nne Hebron, ND | RELAYED TO NWS BY BROADCAST MEDIA. |
| Jul 16, 9:15 PM CDT | HAIL 1.75 | 5 Nw Hebron, ND | RELAYED TO NWS BY BROADCAST MEDIA. |
| Jul 16, 9:28 PM CDT | HAIL 1.75 | 5 Wnw Hebron, ND | TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 2.0 hours before the alert went out and 103 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.
- Mixed-layer CAPE
- 1026 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1949 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 454 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 11.5
The text
As transmitted.
308
WUUS53 KBIS 170157
SVRBIS
NDC057-059-089-170230-
/O.NEW.KBIS.SV.W.0104.210717T0157Z-210717T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Bismarck ND
857 PM CDT Fri Jul 16 2021
The National Weather Service in Bismarck has issued a
* Severe Thunderstorm Warning for...
Northwestern Morton County in south central North Dakota...
Northeastern Stark County in southwestern North Dakota...
Southwestern Mercer County in south central North Dakota...
* Until 930 PM CDT/830 PM MDT/.
* At 857 PM CDT/757 PM MDT/, a severe thunderstorm was located 8
miles north of Hebron, or 16 miles northwest of Glen Ullin, moving
southwest at 15 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Hebron.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4710 10202 4706 10183 4684 10192 4693 10226
TIME...MOT...LOC 0157Z 029DEG 12KT 4702 10199
HAIL...1.25IN
WIND...60MPH
$$
GALE1 follow-up statement
945
WWUS53 KBIS 170211
SVSBIS
Severe Weather Statement
National Weather Service Bismarck ND
911 PM CDT Fri Jul 16 2021
NDC057-059-089-170230-
/O.CON.KBIS.SV.W.0104.000000T0000Z-210717T0230Z/
Morton ND-Stark ND-Mercer ND-
911 PM CDT Fri Jul 16 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM
CDT/830 PM MDT/ FOR NORTHWESTERN MORTON...NORTHEASTERN STARK AND
SOUTHWESTERN MERCER COUNTIES...
At 910 PM CDT/810 PM MDT/, a severe thunderstorm was located 6 miles
north of Hebron, or 16 miles northwest of Glen Ullin, moving
southwest at 20 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Hebron.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4707 10206 4702 10188 4685 10196 4693 10226
TIME...MOT...LOC 0210Z 048DEG 19KT 4699 10207
HAIL...1.75IN
WIND...60MPH
$$
GALEThe office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 7:04 PM CDT | Special Weather Statement | BIS | Oliver | 26 min |
| Jul 16, 7:08 PM CDT | Special Weather Statement | BIS | Slope | 37 min |
| Jul 16, 7:52 PM CDT | Special Weather Statement | BIS | Mercer | 23 min |
| Jul 16, 8:00 PM CDT | Severe Thunderstorm Warning | BIS | Mercer, Oliver | 30 min |
| Jul 16, 8:29 PM CDT | Severe Thunderstorm Warning | BIS | Mercer, Oliver | 31 min |
| Jul 16, 9:28 PM CDT | Severe Thunderstorm Warning | BIS | Morton, Stark | 22 min |
| Jul 16, 11:39 PM CDT | Special Weather Statement | BIS | Slope | 51 min |
| Jul 17, 12:55 AM CDT | Special Weather Statement | BIS | Sheridan | 35 min |
| Jul 17, 1:32 AM CDT | Special Weather Statement | BIS | Sheridan | 28 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.