Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 73, NWS Grand Forks, ND

July 12, 2012Norman County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 12, 2012, 6:47 PM CDT for Norman County, Minnesota. It was in force for 35 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 12, 2012, 6:47 PM CDT (23:47 UTC)
Expired
Jul 12, 2012, 7:22 PM CDT
In force
35 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Norman County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 76 km from the middle of the area, began a volume at 23:47 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 12, 6:50 PM CDTHAIL 0.752 Sw Ada, MN

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 12:00Z, 11.8 hours before the alert went out and 263 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 2012-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 80 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 2012-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 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
80 J/kg
Mixed-layer CIN
-183 J/kg
Mixed-layer LCL
1401 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
1 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

404 
WUUS53 KFGF 122347
SVRFGF
MNC107-130045-
/O.NEW.KFGF.SV.W.0073.120712T2347Z-120713T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
647 PM CDT THU JUL 12 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORMAN COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 745 PM CDT

* AT 642 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS
  LOCATED 3 MILES SOUTHWEST OF ADA...OR 30 MILES NORTHEAST OF
  FARGO...MOVING TO THE EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TWIN VALLEY AROUND 720 PM CDT.
  GARY AND FLAMING AROUND 725 PM CDT.
  WAUKON AND FAITH AROUND 740 PM CDT.
  RANUM AROUND 745 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4749 9607 4722 9608 4720 9673 4742 9675
TIME...MOT...LOC 2348Z 260DEG 19KT 4729 9651
WIND...HAIL 60MPH 1.50IN

$$

BRAMER
2 follow-up statements
423 
WWUS53 KFGF 130012
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
712 PM CDT THU JUL 12 2012

MNC107-130045-
/O.CON.KFGF.SV.W.0073.000000T0000Z-120713T0045Z/
NORMAN MN-
712 PM CDT THU JUL 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN NORMAN
COUNTY IN NORTHWEST MINNESOTA UNTIL 745 PM CDT...

AT 710 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
EAST OF ADA...OR 33 MILES NORTHEAST OF FARGO...MOVING TO THE EAST AT
20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TWIN VALLEY...GARY AND FLAMING AROUND 735 PM CDT.
  WAUKON...RANUM AND FAITH AROUND 745 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4749 9607 4722 9608 4721 9657 4743 9657
TIME...MOT...LOC 0012Z 264DEG 17KT 4728 9642
WIND...HAIL 60MPH 1.00IN

$$

BRAMER
105 
WWUS53 KFGF 130022
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
722 PM CDT THU JUL 12 2012

MNC107-130032-
/O.CAN.KFGF.SV.W.0073.000000T0000Z-120713T0045Z/
NORMAN MN-
722 PM CDT THU JUL 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN NORMAN COUNTY IN
NORTHWEST MINNESOTA IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4749 9607 4722 9608 4721 9657 4743 9657
TIME...MOT...LOC 0022Z 264DEG 17KT 4727 9640

$$

BRAMER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 4:15 PM CDTTornado WarningFGFPolk45 min
Jul 12, 4:22 PM CDTSpecial Weather StatementFGFNorman53 min
Jul 12, 5:03 PM CDTSevere Thunderstorm WarningFGFPolk57 min
Jul 12, 5:21 PM CDTSpecial Weather StatementFGFKittson54 min
Jul 12, 5:41 PM CDTSevere Thunderstorm WarningFGFLake of the Woods, Roseau25 min
Jul 12, 6:10 PM CDTSpecial Weather StatementFGFLake of the Woods65 min
Jul 12, 6:15 PM CDTSpecial Weather StatementFGFPolk60 min
Jul 12, 6:18 PM CDTSpecial Weather StatementFGFNorman57 min
Jul 12, 6:22 PM CDTSpecial Weather StatementFGFKittson53 min
Jul 12, 6:39 PM CDTSevere Thunderstorm WarningFGFRoseau51 min
Jul 12, 6:45 PM CDTSevere Thunderstorm WarningFGFClay60 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.