Alert archive / North Dakota / Tornado Warnings in 2013

Tornado Warning 16, NWS Grand Forks, ND

August 31, 2013Pembina County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 31, 2013, 4:06 PM CDT for Pembina County, North Dakota. It was in force for 24 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 31, 2013, 4:06 PM CDT (21:06 UTC)
Expired
Aug 31, 2013, 4:30 PM CDT
In force
24 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

County Pembina County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 126 km from the middle of the area, began a volume at 21:09 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 nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 9.1 hours before the alert went out and 298 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-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 2013-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 216 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 2013-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
216 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
706 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

556 
WFUS53 KFGF 312106
TORFGF
NDC067-312130-
/O.NEW.KFGF.TO.W.0016.130831T2106Z-130831T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
406 PM CDT SAT AUG 31 2013

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN PEMBINA COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 430 PM CDT

* AT 404 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR ST. THOMAS...AND MOVING EAST AT 30 MPH.

  HAZARD...TORNADO.

  SOURCE...RADAR INDICATED ROTATION. SPOTTERS REPORTED DUST BEING DRAWN
  UP INTO STORM. 

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

* THIS DANGEROUS STORM WILL BE NEAR...
  ST. THOMAS AND GLASSTON AROUND 410 PM CDT.
  BOWESMONT AROUND 430 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 IN GRAND
FORKS.

&&

LAT...LON 4872 9715 4857 9717 4855 9770 4874 9762
TIME...MOT...LOC 2105Z 273DEG 28KT 4863 9748

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

DTR
1 follow-up statement
082 
WWUS53 KFGF 312131
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
431 PM CDT SAT AUG 31 2013

NDC067-312141-
/O.EXP.KFGF.TO.W.0016.000000T0000Z-130831T2130Z/
PEMBINA ND-
431 PM CDT SAT AUG 31 2013

...THE TORNADO WARNING FOR SOUTHEASTERN PEMBINA COUNTY HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THE STORM WAS LOCATED BETWEEN ST THOMAS AND DRAYTON AND MAY STILL 
PRODUCE SMALL HAIL AND HEAVY RAIN.  BUT ROTATION HAS WEAKENED. 

LAT...LON 4872 9715 4857 9717 4855 9770 4874 9762
TIME...MOT...LOC 2106Z 273DEG 28KT 4863 9747

$$

DTR

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 7:50 PM CDTSpecial Weather StatementFGFTowner55 min
Aug 30, 11:08 PM CDTSpecial Weather StatementFGFBenson67 min
Aug 31, 3:51 PM CDTSevere Thunderstorm WarningFGFRichland24 min
Aug 31, 5:23 PM CDTSevere Thunderstorm WarningFGFPembina67 min

Nearby

Tornado Warnings in North Dakota, 2013Every tornado warning in 2013Tornadoes in 2013

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.