Alert archive / North Dakota / Tornado Warnings in 2015

Tornado Warning 35, NWS Grand Forks, ND

July 11, 2015Benson County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 11, 2015, 10:10 PM CDT for Benson County, North Dakota. It was in force for 50 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 11, 2015, 10:10 PM CDT (03:10 UTC)
Expired: Jul 11, 2015, 11:00 PM CDT
In force: 50 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Benson County, ND

The radar

The Minot AFB radar (KMBX), 101 km from the middle of the area, began a volume at 03:13 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 11, 10:40 PM CDT	HAIL 1	2 E Leeds, ND

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 11, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.2 hours before the alert went out and 175 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: 2051 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1927 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

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

487 
WFUS53 KFGF 120310
TORFGF
NDC005-120400-
/O.NEW.KFGF.TO.W.0035.150712T0310Z-150712T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1010 PM CDT SAT JUL 11 2015

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BENSON COUNTY IN NORTHEASTERN NORTH DAKOTA...

* UNTIL 1100 PM CDT
    
* AT 1009 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A 
  TORNADO WAS LOCATED NEAR1 MILE SOUTH OF BAKER MOVING NORTHEAST AT 
  10 MPH.

  HAZARD...TORNADO AND PING PONG BALL SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES. 

* THIS DANGEROUS STORM WILL BE NEAR...
  BAKER AROUND 1025 PM CDT.
  HARLOW AROUND 1040 PM CDT.
  LEEDS AND YORK AROUND 1100 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING ISSUED
FOR THE SAME AREA.

&&

LAT...LON 4799 9953 4808 9983 4837 9969 4829 9920
TIME...MOT...LOC 0309Z 205DEG 9KT 4811 9963 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

SPEICHER

2 follow-up statements

167 
WWUS53 KFGF 120323
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1023 PM CDT SAT JUL 11 2015

NDC005-120400-
/O.CON.KFGF.TO.W.0035.000000T0000Z-150712T0400Z/
BENSON ND-
1023 PM CDT SAT JUL 11 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
NORTHWESTERN BENSON COUNTY...
    
AT 1023 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER HARLOW...OR 24 MILES SOUTHEAST OF RUGBY...MOVING
NORTHEAST AT 20 MPH.

HAZARD...TORNADO AND PING PONG BALL SIZE HAIL. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

THIS DANGEROUS STORM WILL BE NEAR...
  HARLOW AROUND 1030 PM CDT.
  LEEDS AROUND 1100 PM CDT.

LAT...LON 4802 9949 4811 9976 4837 9969 4829 9924
      4810 9941
TIME...MOT...LOC 0323Z 224DEG 15KT 4816 9956 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$
SPEICHER

246 
WWUS53 KFGF 120349
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1049 PM CDT SAT JUL 11 2015

NDC005-120400-
/O.CON.KFGF.TO.W.0035.000000T0000Z-150712T0400Z/
BENSON ND-
1049 PM CDT SAT JUL 11 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
NORTHWESTERN BENSON COUNTY...
    
AT 1048 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER HARLOW MOVING NORTHEAST AT 15 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

THIS DANGEROUS STORM WILL BE NEAR...
  HARLOW AROUND 1055 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4802 9949 4810 9968 4834 9954 4829 9924
      4810 9941
TIME...MOT...LOC 0348Z 237DEG 13KT 4813 9952 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

SPEICHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 8:54 PM CDT	Special Weather Statement	FGF	Benson	66 min
Jul 11, 9:17 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Towner	58 min
Jul 11, 11:01 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey, Towner	59 min
Jul 11, 11:24 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	36 min
Jul 12, 12:19 AM CDT	Special Weather Statement	FGF	Benson	56 min
Jul 12, 2:41 AM CDT	Special Weather Statement	FGF	Nelson	34 min
Jul 12, 3:48 AM CDT	Special Weather Statement	FGF	Grand Forks	57 min
Jul 12, 4:50 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	55 min
Jul 12, 2:48 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Ramsey	46 min
Jul 12, 3:37 PM CDT	Tornado Warning	FGF	Grand Forks, Steele, Traill	38 min
Jul 12, 3:55 PM CDT	Severe Thunderstorm Warning	FGF	Nelson, Ramsey, Walsh	65 min
Jul 12, 3:57 PM CDT	Tornado Warning	FGF	Grand Forks, Traill	38 min
Jul 12, 4:03 PM CDT	Tornado Warning	FGF	Grand Forks	42 min
Jul 12, 4:14 PM CDT	Tornado Warning	FGF	Grand Forks, Nelson, Walsh	46 min
Jul 12, 4:46 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	59 min
Jul 12, 5:04 PM CDT	Tornado Warning	FGF	Walsh	41 min
Jul 12, 5:29 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	34 min
Jul 12, 5:43 PM CDT	Severe Thunderstorm Warning	FGF	Pembina, Walsh	62 min
Jul 12, 6:23 PM CDT	Tornado Warning	FGF	Cass, Richland	52 min

Nearby

Tornado Warnings in North Dakota, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.