Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 110, NWS Grand Forks, ND

August 3, 20125 counties in Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 3, 2012, 7:11 PM CDT for 5 counties in Minnesota. It was in force for 64 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
Aug 3, 2012, 7:11 PM CDT (00:11 UTC)
Expired
Aug 3, 2012, 8:15 PM CDT
In force
64 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.0 in
Wind
70.0 mph

Counties Clearwater County, MN, Mahnomen County, MN, Norman County, MN, Polk County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 102 km from the middle of the area, began a volume at 00:13 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

TimeReportWhereRemark
Aug 3, 7:20 PM CDTTSTM WND DMGMaple Bay, MNTREES REPORTED DOWN AND BOATLIFTS FLIPPED OVER.
Aug 3, 7:20 PM CDTTSTM WND DMGMentor, MNTREES AND POWER LINES DOWN.

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.

IssuedProductOfficeLasted
Aug 3, 2:14 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 0.2 hours before the alert went out and 227 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 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 96 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 00:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 square meters per square second.19395878Sfc1 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
96 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
1457 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

106 
WUUS53 KFGF 040011
SVRFGF
MNC029-087-107-119-125-040115-
/O.NEW.KFGF.SV.W.0110.120804T0011Z-120804T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
711 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLEARWATER COUNTY IN NORTHWEST MINNESOTA...
  NORTHERN MAHNOMEN COUNTY IN NORTHWEST MINNESOTA...
  NORTHEASTERN NORMAN COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN POLK COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN RED LAKE COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 815 PM CDT

* AT 708 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 70 MPH. THE STORM WAS LOCATED 2 MILES
  SOUTH OF MAPLE BAY...OR 35 MILES SOUTH OF THIEF RIVER FALLS...
  MOVING TO THE EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WINGER...ERSKINE AND BEJOU AROUND 720 PM CDT.
  BROOKS AROUND 725 PM CDT.
  MCINTOSH AROUND 730 PM CDT.
  FOSSTON...OKLEE AND ISLAND_LAKE AROUND 735 PM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE PINE BEND...TRAIL...WEME...CLEARBROOK...SHEVLIN AND LEONARD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4739 9644 4773 9648 4800 9530 4742 9521
TIME...MOT...LOC 0011Z 252DEG 40KT 4761 9618
WIND...HAIL 70MPH 1.00IN

$$

PR/BB
1 follow-up statement
665 
WWUS53 KFGF 040043
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
743 PM CDT FRI AUG 3 2012

MNC029-087-107-119-125-040115-
/O.CON.KFGF.SV.W.0110.000000T0000Z-120804T0115Z/
MAHNOMEN MN-NORMAN MN-RED LAKE MN-CLEARWATER MN-POLK MN-
743 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
POLK...NORTHERN CLEARWATER...SOUTHEASTERN RED LAKE...NORTHEASTERN
NORMAN AND NORTHERN MAHNOMEN COUNTIES IN NORTHWEST MINNESOTA UNTIL
815 PM CDT...

AT 741 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 70 MPH.  THE STORM WAS LOCATED 3 MILES
SOUTH OF TRAIL...OR 33 MILES SOUTHEAST OF THIEF RIVER FALLS...MOVING 
TO THE EAST AT 45 MPH. AT 720 PM CDT...SPOTTERS REPORTED TREES DOWN 
AND BOAT LIFTS FLIPPED OVER AT MAPLE BAY. 

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WEME AND GONVICK AROUND 750 PM CDT.
  CLEARBROOK...BAGLEY AND BERNER AROUND 755 PM CDT.
  SHEVLIN AROUND 800 PM CDT.
  LEONARD AROUND 805 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4742 9521 4740 9611 4780 9618 4800 9530
TIME...MOT...LOC 0042Z 252DEG 40KT 4774 9570
WIND...HAIL 70MPH 1.00IN

$$

ROGERS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:20 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Hubbard, Otter Tail, Wadena, Wilkin55 min
Aug 3, 7:22 PM CDTTornado WarningFGFClearwater, Polk, Red Lake39 min
Aug 3, 7:32 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Mahnomen, Norman58 min
Aug 3, 7:44 PM CDTSevere Thunderstorm WarningFGFOtter Tail, Wilkin61 min
Aug 3, 7:54 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Pennington, Polk, Red Lake66 min
Aug 3, 7:57 PM CDTTornado WarningFGFBecker, Clay, Mahnomen, Norman48 min
Aug 3, 8:06 PM CDTSevere Thunderstorm WarningFGFGrant, Otter Tail, Wilkin54 min
Aug 3, 8:12 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Clearwater, Hubbard, Otter Tail, Wadena63 min
Aug 3, 8:20 PM CDTSevere Thunderstorm WarningFGFBecker, Beltrami, Clearwater, Hubbard, Mahnomen, Norman and 1 more55 min
Aug 3, 8:27 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Lake of the Woods, Marshall, Roseau63 min

Nearby

Severe 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.