Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 72, NWS Grand Forks, ND

July 12, 2012Clay County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 12, 2012, 6:45 PM CDT for Clay County, Minnesota. It was in force for 60 min. 3 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 12, 2012, 6:45 PM CDT (23:45 UTC)
Expired: Jul 12, 2012, 7:45 PM CDT
In force: 60 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Clay County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 83 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

Time	Report	Where	Remark
Jul 12, 7:30 PM CDT	HAIL 0.88	1 N Averill, MN
Jul 12, 7:40 PM CDT	TSTM WND DMG	5 Ne Glyndon, MN	SEVERAL LARGE 4 TO 6 INCH DIAMETER TREE LIMBS BROKEN DOWN.
Jul 12, 7:50 PM CDT	HAIL 0.88	1 S Hitterdal, MN	BRIEF HAIL AND STRONG WINDS. WINDS ESTIMATED TO 55 MPH.

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

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.8 hours before the alert went out and 274 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: 317 J/kg
Mixed-layer CIN: -359 J/kg
Mixed-layer LCL: 1288 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 352 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

070 
WUUS53 KFGF 122345
SVRFGF
MNC027-130045-
/O.NEW.KFGF.SV.W.0072.120712T2345Z-120713T0045Z/

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CLAY COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 745 PM CDT

* AT 642 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE
  STORM WAS LOCATED 3 MILES NORTHWEST OF AVERILL...OR 15 MILES
  NORTHEAST OF FARGO...MOVING TO THE EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FELTON AROUND 655 PM CDT.
  HITTERDAL AROUND 720 PM CDT.
  ULEN AND DALE AROUND 725 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4690 9676 4715 9680 4715 9620 4690 9619
TIME...MOT...LOC 2345Z 260DEG 18KT 4702 9655
WIND...HAIL <50MPH 1.00IN

$$

BRAMER

1 follow-up statement

444 
WWUS53 KFGF 130004
SVSFGF

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

MNC027-130045-
/O.CON.KFGF.SV.W.0072.000000T0000Z-120713T0045Z/
CLAY MN-
704 PM CDT THU JUL 12 2012

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

AT 701 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
SOUTH OF FELTON...OR 19 MILES NORTHEAST OF FARGO...MOVING TO THE EAST
AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ULEN...HITTERDAL AND DALE AROUND 730 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4690 9668 4714 9669 4715 9620 4690 9619
TIME...MOT...LOC 0005Z 260DEG 18KT 4702 9645
WIND...HAIL 60MPH 1.00IN

$$

BRAMER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 4:15 PM CDT	Tornado Warning	FGF	Polk	45 min
Jul 12, 4:22 PM CDT	Special Weather Statement	FGF	Norman	53 min
Jul 12, 5:03 PM CDT	Severe Thunderstorm Warning	FGF	Polk	57 min
Jul 12, 5:21 PM CDT	Special Weather Statement	FGF	Kittson	54 min
Jul 12, 5:41 PM CDT	Severe Thunderstorm Warning	FGF	Lake of the Woods, Roseau	25 min
Jul 12, 6:10 PM CDT	Special Weather Statement	FGF	Lake of the Woods	65 min
Jul 12, 6:15 PM CDT	Special Weather Statement	FGF	Polk	60 min
Jul 12, 6:18 PM CDT	Special Weather Statement	FGF	Norman	57 min
Jul 12, 6:22 PM CDT	Special Weather Statement	FGF	Kittson	53 min
Jul 12, 6:39 PM CDT	Severe Thunderstorm Warning	FGF	Roseau	51 min
Jul 12, 6:47 PM CDT	Severe Thunderstorm Warning	FGF	Norman	35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every 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.