Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 70, NWS Bismarck, ND

July 18, 2011Adams County, Grant County, Sioux County, North Dakota

NWS Bismarck, ND issued this tornado warning at Jul 18, 2011, 7:01 PM MDT for Adams County, Grant County, Sioux County, North Dakota. It was in force for 29 min. 1 report 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 18, 2011, 7:01 PM MDT (01:01 UTC)
Expired: Jul 18, 2011, 7:30 PM MDT
In force: 29 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon

Counties Adams County, ND, Grant County, ND, Sioux County, ND

The radar

The Bismarck radar (KBIS), 121 km from the middle of the area, began a volume at 01:00 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 18, 7:30 PM MDT	HAIL 1	50 W Selfridge, ND	HAIL LASTED A FEW MINUTES.

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 18, 2:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.0 hours before the alert went out and 124 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: 3044 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1324 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

352 
WFUS53 KBIS 190101
TORBIS
NDC001-037-085-190130-
/O.NEW.KBIS.TO.W.0070.110719T0101Z-110719T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
701 PM MDT MON JUL 18 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN ADAMS COUNTY IN SOUTHWEST NORTH DAKOTA...
  EXTREME SOUTHWESTERN GRANT COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  SOUTHWESTERN SIOUX COUNTY IN SOUTH CENTRAL NORTH DAKOTA...

* UNTIL 730 PM MDT

* AT 656 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR THUNDER HAWK...OR 5 MILES EAST OF LEMMON...
  AND MOVING EAST AT 15 MPH.

* THIS DANGEROUS STORM WILL AFFECT MAINLY RURAL AREAS OF EXTREME
  SOUTHWESTERN GRANT...SOUTHEASTERN ADAMS AND SOUTHWESTERN SIOUX
  COUNTIES...NEAR AND JUST NORTH OF KELDRON AND MORRISTOWN IN SOUTH
  DAKOTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4608 10173 4595 10172 4595 10217 4605 10217
TIME...MOT...LOC 0059Z 268DEG 13KT 4596 10204

$$

VINING

1 follow-up statement

478 
WWUS53 KBIS 190115
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
815 PM CDT MON JUL 18 2011

NDC037-190124-
/O.CAN.KBIS.TO.W.0070.000000T0000Z-110719T0130Z/
GRANT ND-
715 PM MDT MON JUL 18 2011

...THE TORNADO WARNING FOR EXTREME SOUTHWESTERN GRANT COUNTY IS
CANCELLED...

THE STRONG ROTATION THAT PROMPTED THE TORNADO WARNING IS NOW 
EXPECTED TO REMAIN IN SIOUX COUNTY. HOWEVER A SEVERE THUNDERSTORM 
WARNING REMAINS IN EFFECT FOR SOUTHERN GRANT COUNTY. 

LAT...LON 4595 10210 4604 10210 4605 10185 4603 10183
      4604 10182 4602 10180 4604 10179 4604 10176
      4603 10175 4595 10172
TIME...MOT...LOC 0114Z 281DEG 9KT 4595 10199

$$

NDC001-085-190130-
/O.CON.KBIS.TO.W.0070.000000T0000Z-110719T0130Z/
ADAMS ND-SIOUX ND-
715 PM MDT MON JUL 18 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWESTERN SIOUX AND
SOUTHEASTERN ADAMS COUNTIES UNTIL 730 PM MDT...

AT 709 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR THUNDER HAWK...OR 7 MILES EAST OF LEMMON...
MOVING EAST AT 10 MPH.

IN ADDITION TO THE POSSIBLE TORNADO...LARGE HAIL UP TO THE SIZE OF 
GOLF BALLS CAN BE EXPECTED ALONG WITH VERY HEAVY RAIN. 

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME SOUTHWESTERN SIOUX COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4595 10210 4604 10210 4605 10185 4603 10183
      4604 10182 4602 10180 4604 10179 4604 10176
      4603 10175 4595 10172
TIME...MOT...LOC 0114Z 281DEG 9KT 4595 10199

$$

HEINERT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:22 PM MDT	Tornado Warning	BIS	Adams	38 min
Jul 18, 6:43 PM MDT	Severe Thunderstorm Warning	BIS	Adams, Grant, Sioux	62 min
Jul 18, 7:30 PM MDT	Tornado Warning	BIS	Sioux	30 min
Jul 18, 7:46 PM MDT	Severe Thunderstorm Warning	BIS	Grant, Sioux	45 min
Jul 18, 8:19 PM MDT	Areal Flood Advisory	BIS	Sioux	9 hr
Jul 19, 1:57 PM MDT	Wind Advisory	BIS	Adams, Billings, Bowman, Burke, Burleigh, Divide and 13 more	28 hr
Jul 19, 3:55 PM MDT	Severe Thunderstorm Warning	BIS	Golden Valley	65 min
Jul 19, 4:39 PM MDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	66 min
Jul 19, 5:44 PM MDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley, Slope	61 min
Jul 19, 5:54 PM MDT	Flash Flood Warning	BIS	Billings, Golden Valley, Slope	4 hr

Nearby

Tornado Warnings in North Dakota, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.