Alert archive / North Dakota / Tornado Warnings in 2020
Tornado Warning 31, NWS Grand Forks, ND
NWS Grand Forks, ND issued this tornado warning at Aug 9, 2020, 2:25 PM CDT for Cass County, North Dakota. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2020, 2:25 PM CDT (19:25 UTC)
- Expired
- Aug 9, 2020, 2:55 PM CDT
- In force
- 30 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Cass County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 50 km from the middle of the area, began a volume at 19:26 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 9, 12:18 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 7.4 hours before the alert went out and 255 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1862 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -35 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
852
WFUS53 KFGF 091925
TORFGF
NDC017-092015-
/O.NEW.KFGF.TO.W.0031.200809T1925Z-200809T2015Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Forks ND
225 PM CDT Sun Aug 9 2020
The National Weather Service in Grand Forks has issued a
* Tornado Warning for...
Northwestern Cass County in southeastern North Dakota...
* Until 315 PM CDT.
* At 225 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Ayr, or 27 miles east of Valley City, moving east
at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Expect damage to mobile homes, roofs, and vehicles.
* This dangerous storm will be near...
Erie around 235 PM CDT.
Arthur around 255 PM CDT.
Amenia around 300 PM CDT.
This includes Interstate 29 between mile markers 88 and 89.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4703 9758 4717 9753 4720 9697 4695 9707
TIME...MOT...LOC 1925Z 281DEG 19KT 4707 9747
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
DJR2 follow-up statements
024
WWUS53 KFGF 091937
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
237 PM CDT Sun Aug 9 2020
NDC017-092015-
/O.CON.KFGF.TO.W.0031.000000T0000Z-200809T2015Z/
Cass ND-
237 PM CDT Sun Aug 9 2020
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM CDT FOR
NORTHWESTERN CASS COUNTY...
At 237 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Erie, or 29 miles northwest of Fargo, moving east at
20 mph.
HAZARD...TORNADO.
SOURCE...Radar indicated rotation.
IMPACT...Expect damage to mobile homes, roofs, and vehicles.
This dangerous storm will be near...
Arthur around 255 PM CDT.
Amenia around 300 PM CDT.
This includes Interstate 29 between mile markers 88 and 89.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4702 9750 4715 9743 4720 9697 4695 9707
TIME...MOT...LOC 1937Z 281DEG 19KT 4706 9737
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
DJR852
WWUS53 KFGF 091955
SVSFGF
Severe Weather Statement
National Weather Service Grand Forks ND
255 PM CDT Sun Aug 9 2020
NDC017-092005-
/O.CAN.KFGF.TO.W.0031.000000T0000Z-200809T2015Z/
Cass ND-
255 PM CDT Sun Aug 9 2020
...THE TORNADO WARNING FOR NORTHWESTERN CASS COUNTY IS CANCELLED...
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
southeastern North Dakota.
LAT...LON 4702 9750 4715 9743 4720 9697 4695 9707
TIME...MOT...LOC 1954Z 281DEG 19KT 4704 9723
$$
DJRThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 4:29 AM CDT | Special Weather Statement | FGF | Richland | 61 min |
| Aug 9, 5:31 AM CDT | Special Weather Statement | FGF | Ransom | 59 min |
| Aug 9, 6:01 AM CDT | Severe Thunderstorm Warning | FGF | Benson, Ramsey | 59 min |
| Aug 9, 6:57 AM CDT | Special Weather Statement | FGF | Benson, Ramsey | 48 min |
| Aug 9, 9:09 AM CDT | Special Weather Statement | FGF | Grand Forks | 66 min |
| Aug 9, 9:51 AM CDT | Special Weather Statement | FGF | Walsh | 54 min |
| Aug 9, 10:12 AM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Nelson, Ramsey, Walsh | 63 min |
| Aug 9, 10:24 AM CDT | Special Weather Statement | FGF | Cavalier, Towner | 66 min |
| Aug 9, 11:05 AM CDT | Special Weather Statement | FGF | Walsh | 55 min |
| Aug 9, 11:24 AM CDT | Special Weather Statement | FGF | Cavalier, Pembina | 66 min |
| Aug 9, 11:28 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina, Walsh | 62 min |
| Aug 9, 11:42 AM CDT | Tornado Warning | FGF | Cavalier, Pembina, Walsh | 36 min |
| Aug 9, 12:21 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina, Walsh | 54 min |
| Aug 9, 12:27 PM CDT | Special Weather Statement | FGF | Grand Forks, Nelson, Walsh | 63 min |
| Aug 9, 1:29 PM CDT | Special Weather Statement | FGF | Grand Forks | 61 min |
| Aug 9, 1:39 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Walsh | 66 min |
| Aug 9, 2:10 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Traill | 65 min |
| Aug 9, 2:14 PM CDT | Tornado Warning | FGF | Barnes, Cass | 18 min |
| Aug 9, 2:36 PM CDT | Tornado Warning | FGF | Traill | 28 min |
| Aug 9, 2:52 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 53 min |
| Aug 9, 3:12 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 63 min |
| Aug 9, 3:20 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 22 min |
| Aug 9, 3:35 PM CDT | Tornado Warning | FGF | Cass | 18 min |
| Aug 9, 3:38 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 25 min |
| Aug 9, 3:53 PM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 48 min |
| Aug 9, 3:55 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 28 min |
| Aug 9, 4:24 PM CDT | Special Weather Statement | FGF | Sargent | 36 min |
Nearby
Tornado Warnings in North Dakota, 2020Every tornado warning in 2020Tornadoes in 2020
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.