Alert archive / North Dakota / Tornado Warnings in 2018

Tornado Warning 22, NWS Grand Forks, ND

July 8, 2018Sargent County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 8, 2018, 6:41 PM CDT for Sargent County, North Dakota. It was in force for 49 min. 2 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 8, 2018, 6:41 PM CDT (23:41 UTC)
Expired: Jul 8, 2018, 7:30 PM CDT
In force: 49 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.5 in

County Sargent County, ND

The radar

The Aberdeen radar (KABR), 80 km from the middle of the area, began a volume at 23:43 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 8, 7:10 PM CDT	TSTM WND GST 55	2 Wsw Brampton, ND	PEAK WINDS MEASURED AT THE NAWN STATION NEAR BRAMPTON.
Jul 8, 7:15 PM CDT	TSTM WND DMG	2 S Brampton, ND	A FEW TREES BROKEN DOWN IN SHELTER BELT. SOME WIND DRIVEN HAIL DAMAGE EVIDENT IN FIELDS ACROSS SOUTHEAST BRAMPTON TOWNSHIP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 8, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.7 hours before the alert went out and 135 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1150 J/kg
Mixed-layer CIN: -332 J/kg
Mixed-layer LCL: 1241 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

099 
WFUS53 KFGF 082341
TORFGF
NDC081-090030-
/O.NEW.KFGF.TO.W.0022.180708T2341Z-180709T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Eastern ND/Grand Forks ND
641 PM CDT SUN JUL 8 2018

The National Weather Service in Grand Forks has issued a

* Tornado Warning for...
  Southwestern Sargent County in southeastern North Dakota...

* Until 730 PM CDT.
    
* At 641 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Ludden, or 61 miles south of Valley City, moving
  east at 25 mph.

  HAZARD...Tornado and tennis ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Expect damage to mobile homes, roofs, and vehicles.

* This dangerous storm will be near...
  Straubville around 705 PM CDT.
  Brampton around 725 PM CDT.
  Havana around 730 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Grand Forks.

&&

LAT...LON 4594 9801 4616 9801 4619 9800 4610 9744
      4594 9751
TIME...MOT...LOC 2341Z 289DEG 20KT 4604 9810 

TORNADO...RADAR INDICATED
HAIL...2.50IN

$$

NC

1 follow-up statement

340 
WWUS53 KFGF 090023
SVSFGF

Severe Weather Statement
National Weather Service Eastern ND/Grand Forks ND
723 PM CDT SUN JUL 8 2018

NDC081-090033-
/O.EXP.KFGF.TO.W.0022.000000T0000Z-180709T0030Z/
Sargent ND-
723 PM CDT SUN JUL 8 2018

...THE TORNADO WARNING FOR SOUTHWESTERN SARGENT COUNTY WILL EXPIRE AT
730 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern North Dakota.

LAT...LON 4594 9801 4616 9801 4619 9800 4610 9744
      4594 9751
TIME...MOT...LOC 0023Z 289DEG 20KT 4596 9779 

$$

NC

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 8, 3:18 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Grand Forks, Griggs, Nelson, Ramsey and 1 more	57 min
Jul 8, 4:13 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Grand Forks, Griggs, Nelson, Ramsey and 2 more	62 min
Jul 8, 4:19 AM CDT	Special Weather Statement	FGF	Ramsey	56 min
Jul 8, 4:52 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele	53 min
Jul 8, 5:35 AM CDT	Areal Flood Advisory	FGF	Grand Forks	85 min
Jul 8, 6:27 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	52 min
Jul 8, 6:37 PM CDT	Tornado Warning	FGF	Ransom, Richland, Sargent	38 min
Jul 8, 6:56 PM CDT	Special Weather Statement	FGF	Cass	34 min

Nearby

Tornado Warnings in North Dakota, 2018 Every tornado warning in 2018 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.