Alert archive / North Dakota / Tornado Warnings in 2011

Tornado Warning 27, NWS Bismarck, ND

July 8, 2011McLean County, Mercer County, Oliver County, North Dakota

NWS Bismarck, ND issued this tornado warning at Jul 8, 2011, 6:21 PM CDT for McLean County, Mercer County, Oliver County, North Dakota. It was in force for 39 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 8, 2011, 6:21 PM CDT (23:21 UTC)
Expired: Jul 8, 2011, 7:00 PM CDT
In force: 39 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon

Counties McLean County, ND, Mercer County, ND, Oliver County, ND

The radar

The Bismarck radar (KBIS), 84 km from the middle of the area, began a volume at 23:20 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, 6:59 PM CDT	TORNADO	1 N Underwood, ND	PUBLIC REPORT OF TORNADO RELAYED BY LAW ENFORCEMENT.

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, 2:32 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.4 hours before the alert went out and 87 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: 57 J/kg
Mixed-layer CIN: -207 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

611 
WFUS53 KBIS 082321 RRA
TORBIS
NDC055-057-065-090000-
/O.NEW.KBIS.TO.W.0027.110708T2321Z-110709T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
621 PM CDT FRI JUL 8 2011

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL MCLEAN COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHEASTERN MERCER COUNTY IN SOUTH CENTRAL NORTH DAKOTA...
  NORTHERN OLIVER COUNTY IN SOUTH CENTRAL NORTH DAKOTA...

* UNTIL 700 PM CDT

* AT 616 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR HAZEN...OR 53 MILES NORTHWEST OF BISMARCK...
  AND MOVING NORTHEAST AT 40 MPH.

* THIS DANGEROUS STORM WILL BE NEAR...
  STANTON AROUND 635 PM CDT.
  RIVERDALE AROUND 645 PM CDT.
  UNDERWOOD AND COLEHARBOR AROUND 655 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR 
THE TORNADO. TAKE COVER NOW. IN ADDITION TO A TORNADO...THIS 
THUNDERSTORM IS CAPABLE OF PRODUCING WINDS TO 70 MPH.

THIS TORNADO WARNING REPLACES THE PREVIOUS TORNADO WARNING FOR 
PORTIONS OF DUNN AND MERCER COUNTY.

&&

LAT...LON 4765 10112 4720 10093 4715 10171 4745 10178
TIME...MOT...LOC 2319Z 242DEG 33KT 4731 10162

$$

KINNEY

1 follow-up statement

715 
WWUS53 KBIS 082342
SVSBIS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
642 PM CDT FRI JUL 8 2011

NDC055-057-065-090000-
/O.CON.KBIS.TO.W.0027.000000T0000Z-110709T0000Z/
MCLEAN ND-MERCER ND-OLIVER ND-
642 PM CDT FRI JUL 8 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN OLIVER...
NORTHEASTERN MERCER AND CENTRAL MCLEAN COUNTIES UNTIL 700 PM CDT...

AT 638 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS
AND BRIEF RAIN-WRAPPED TORNADOES.  THIS DANGEROUS STORM WAS LOCATED 
NEAR RIVERDALE...MOVING NORTHEAST AT 40 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  RIVERDALE NOW.
  UNDERWOOD AND COLE HARBOR AROUND 650 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR
THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4718 10138 4753 10153 4765 10112 4720 10093
      4719 10115
TIME...MOT...LOC 2342Z 233DEG 37KT 4748 10134

$$

HAMILTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 2:29 PM CDT	Tornado Warning	BIS	Golden Valley	31 min
Jul 8, 2:51 PM CDT	Severe Thunderstorm Warning	BIS	Golden Valley, McKenzie	39 min
Jul 8, 3:19 PM CDT	Areal Flood Advisory	BIS	Burke, Mountrail, Renville, Ward	3 hr
Jul 8, 3:29 PM CDT	Severe Thunderstorm Warning	BIS	Burke, Mountrail, Renville, Ward	40 min
Jul 8, 3:35 PM CDT	Severe Thunderstorm Warning	BIS	Grant	55 min
Jul 8, 3:39 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Golden Valley	66 min
Jul 8, 4:00 PM CDT	Areal Flood Advisory	BIS	Billings, Dunn, Stark	5 hr
Jul 8, 4:12 PM CDT	Severe Thunderstorm Warning	BIS	Dunn	63 min
Jul 8, 4:21 PM CDT	Severe Thunderstorm Warning	BIS	Billings, Stark	24 min
Jul 8, 4:26 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	64 min
Jul 8, 4:30 PM CDT	Severe Thunderstorm Warning	BIS	Grant, Morton	60 min
Jul 8, 4:39 PM CDT	Areal Flood Advisory	BIS	Burke, Divide, Williams	3 hr
Jul 8, 5:15 PM CDT	Tornado Warning	BIS	Foster, Kidder, Stutsman, Wells	30 min
Jul 8, 5:18 PM CDT	Tornado Warning	BIS	Grant, Morton	42 min
Jul 8, 5:19 PM CDT	Severe Thunderstorm Warning	BIS	Dunn, McLean, Mercer	14 min
Jul 8, 5:22 PM CDT	Tornado Warning	BIS	Dunn, Mercer	23 min
Jul 8, 5:41 PM CDT	Tornado Warning	BIS	Dunn, Mercer	49 min
Jul 8, 5:44 PM CDT	Tornado Warning	BIS	Stutsman	31 min
Jul 8, 5:53 PM CDT	Severe Thunderstorm Warning	BIS	Burleigh, Emmons, Morton, Sioux	52 min
Jul 8, 6:15 PM CDT	Severe Thunderstorm Warning	BIS	Stutsman	31 min
Jul 8, 6:21 PM CDT	Tornado Warning	BIS	Emmons, Morton, Sioux	24 min
Jul 8, 6:42 PM CDT	Tornado Warning	BIS	Stutsman	33 min
Jul 8, 6:45 PM CDT	Tornado Warning	BIS	Emmons, Morton, Sioux	45 min
Jul 8, 6:52 PM CDT	Areal Flood Advisory	BIS	Stutsman	6 hr
Jul 8, 6:59 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, McLean, Oliver, Sheridan	61 min

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.