Alert archive / North Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 101, NWS Grand Forks, ND

July 29, 2012Grand Forks County, Traill County, North Dakota; Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 29, 2012, 9:37 PM CDT for Grand Forks County, Traill County, North Dakota; Polk County, Minnesota. It was in force for 53 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 29, 2012, 9:37 PM CDT (02:37 UTC)
Expired
Jul 29, 2012, 10:30 PM CDT
In force
53 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Polk County, MN, Grand Forks County, ND, Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 40 km from the middle of the area, began a volume at 02:39 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

TimeReportWhereRemark
Jul 29, 10:15 PM CDTHAIL 0.759 Ene Reynolds, ND
Jul 29, 10:30 PM CDTHAIL 0.882 N Eldred, MNSOME DIME TO NICKEL SIZED HAIL.

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

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 2.6 hours before the alert went out and 282 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 00:00Z on 2012-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1490 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 2012-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
1490 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
1732 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.9

Open this sounding in Storm Lab

The text

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

284 
WUUS53 KFGF 300237
SVRFGF
MNC119-NDC035-097-300330-
/O.NEW.KFGF.SV.W.0101.120730T0237Z-120730T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
937 PM CDT SUN JUL 29 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN POLK COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN GRAND FORKS COUNTY IN NORTHEAST NORTH DAKOTA...
  NORTHERN TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 1030 PM CDT

* AT 934 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED 4 MILES
  SOUTHEAST OF HOLMES...OR 18 MILES SOUTHWEST OF GRAND FORKS...MOVING
  TO THE EAST AT 30 MPH. A SECOND STRONG THUNDERSTORM WAS NEAR 
  THOMPSON...ALSO MOVING EAST AT 30 MPH.  

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  THOMPSON AND REYNOLDS AROUND 945 PM CDT.
  CUMMINGS AND BUXTON AROUND 950 PM CDT.
  BYGLAND AROUND 1000 PM CDT.
  FISHER AROUND 1010 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE NIELSVILLE...CROOKSTON AND HAROLD.

FOR MOTORISTS ON INTERSTATE 29...THE SEVERE THUNDERSTORM WILL BE
BETWEEN...MILE MARKERS 120 AND 125 AROUND 950 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4750 9642 4750 9685 4749 9686 4748 9741
      4788 9727 4778 9638
TIME...MOT...LOC 0236Z 276DEG 27KT 4767 9722
WIND...HAIL 60MPH 1.00IN

$$

DTR
2 follow-up statements
797 
WWUS53 KFGF 300305
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1005 PM CDT SUN JUL 29 2012

MNC119-NDC035-097-300330-
/O.CON.KFGF.SV.W.0101.000000T0000Z-120730T0330Z/
GRAND FORKS ND-TRAILL ND-POLK MN-
1005 PM CDT SUN JUL 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN POLK
COUNTY IN NORTHWEST MINNESOTA...AND SOUTHEASTERN GRAND FORKS COUNTY
IN NORTHEAST NORTH DAKOTA...AND NORTHEASTERN TRAILL COUNTY IN
SOUTHEAST NORTH DAKOTA UNTIL 1030 PM CDT...

AT 1002 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STORM WAS LOCATED 6 MILES
NORTHWEST OF CLIMAX...OR 20 MILES SOUTH OF GRAND FORKS...MOVING TO
THE EAST AT 30 MPH.

DIME SIZED HAIL WAS REPORTED 3 MILES SOUTH OF GRAND FORKS AT 1005 PM.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FISHER AROUND 1010 PM CDT.
  NIELSVILLE...ELDRED AND CLIMAX AROUND 1015 PM CDT.
  CROOKSTON...HAROLD AND GREENVIEW AROUND 1030 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE BELTRAMI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4760 9718 4786 9713 4778 9638 4750 9642
      4750 9685 4749 9686
TIME...MOT...LOC 0304Z 276DEG 27KT 4765 9691
WIND...HAIL 60MPH 1.00IN

$$

EWENS
690 
WWUS53 KFGF 300332
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1032 PM CDT SUN JUL 29 2012

MNC119-NDC035-097-300341-
/O.EXP.KFGF.SV.W.0101.000000T0000Z-120730T0330Z/
GRAND FORKS ND-TRAILL ND-POLK MN-
1032 PM CDT SUN JUL 29 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN POLK COUNTY IN
NORTHWEST MINNESOTA...AND SOUTHEASTERN GRAND FORKS COUNTY IN
NORTHEAST NORTH DAKOTA...AND NORTHEASTERN TRAILL COUNTY IN SOUTHEAST
NORTH DAKOTA HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. A NEW SEVERE THUNDERSTORM WARNING HAS BEEN ISSUED FOR POLK AND 
RED LAKE COUNTIES UNTIL 1130 PM...REPLACING THE WARNING TAHT EXPIRED 
AT 1030 PM.

LAT...LON 4760 9718 4786 9713 4778 9638 4750 9642
      4750 9685 4749 9686
TIME...MOT...LOC 0305Z 276DEG 27KT 4765 9690

$$

EWENS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 8:11 PM CDTSpecial Weather StatementFGFBarnes34 min
Jul 29, 8:57 PM CDTSpecial Weather StatementFGFGrand Forks33 min
Jul 29, 9:02 PM CDTSevere Thunderstorm WarningFGFBarnes, Cass58 min
Jul 29, 8:58 PM CDTSpecial Weather StatementFGFRoseau62 min
Jul 29, 9:13 PM CDTSevere Thunderstorm WarningFGFLake of the Woods, Roseau62 min
Jul 29, 9:46 PM CDTSevere Thunderstorm WarningFGFRoseau29 min
Jul 29, 10:14 PM CDTSevere Thunderstorm WarningFGFBeltrami, Lake of the Woods, Marshall, Roseau61 min
Jul 29, 10:29 PM CDTSevere Thunderstorm WarningFGFPolk, Red Lake41 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2012Severe Thunderstorm Warnings in Minnesota, 2012Every severe thunderstorm warning in 2012

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.