Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 7, NWS Grand Forks, ND

May 10, 20115 counties in Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 10, 2011, 4:29 AM CDT for 5 counties in Minnesota. It was in force for 61 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
May 10, 2011, 4:29 AM CDT (09:29 UTC)
Expired
May 10, 2011, 5:30 AM CDT
In force
61 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Becker County, MN, Clearwater County, MN, Mahnomen County, MN, Norman County, MN, Polk County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 114 km from the middle of the area, began a volume at 09:30 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
May 10, 5:21 AM CDTHAIL 18 S Bagley, MN1 INCH HAIL REPORT...8 S. OF BAGLEY

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, 9.5 hours before the alert went out and 245 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 2011-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 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 2011-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
546 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
150 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.

326 
WUUS53 KFGF 100929
SVRFGF
MNC005-029-087-107-119-101030-
/O.NEW.KFGF.SV.W.0007.110510T0929Z-110510T1030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
429 AM CDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BECKER COUNTY IN NORTHWEST MINNESOTA...
  SOUTHERN CLEARWATER COUNTY IN NORTHWEST MINNESOTA...
  MAHNOMEN COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN NORMAN COUNTY IN NORTHWEST MINNESOTA...
  SOUTHEASTERN POLK COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 530 AM CDT

* AT 426 AM 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 NEAR FLOM...OR 29 MILES NORTHWEST OF DETROIT LAKES...MOVING
  TO THE NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WHITE EARTH...WAUBUN AND FAITH AROUND 435 AM CDT.
  WAUKON AROUND 440 AM CDT.
  MAHNOMEN AROUND 445 AM CDT.
  TULABY LAKE AND BEJOU AROUND 455 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE BEAULIEU...NAYTAHWAUSH...MAHKONCE...ROY LAKE...FOSSTON AND
ZERKEL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4717 9519 4705 9613 4711 9620 4715 9620
      4715 9627 4724 9638 4770 9554
TIME...MOT...LOC 0929Z 232DEG 29KT 4720 9609
WIND...HAIL 60MPH 1.50IN

$$

EWENS
2 follow-up statements
126 
WWUS53 KFGF 100954
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
454 AM CDT TUE MAY 10 2011

MNC107-101002-
/O.CAN.KFGF.SV.W.0007.000000T0000Z-110510T1030Z/
NORMAN MN-
454 AM CDT TUE MAY 10 2011

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

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4717 9519 4709 9584 4738 9607 4741 9607
      4770 9554
TIME...MOT...LOC 0952Z 239DEG 31KT 4729 9585

$$

MNC005-029-087-119-101030-
/O.CON.KFGF.SV.W.0007.000000T0000Z-110510T1030Z/
MAHNOMEN MN-POLK MN-CLEARWATER MN-BECKER MN-
454 AM CDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL
BECKER...SOUTHERN CLEARWATER...SOUTHEASTERN POLK AND MAHNOMEN
COUNTIES IN NORTHWEST MINNESOTA UNTIL 530 AM CDT...

AT 449 AM 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 5
MILES SOUTHEAST OF MAHNOMEN...OR 32 MILES NORTH OF DETROIT LAKES...
MOVING TO THE NORTHEAST AT 35 MPH.

IN ADDITION...AT 450 AM DIME HAIL WAS REPORTED IN THE CITY OF 
MAHNOMEN WITH THIS STORM. THE STRONGER PORTION OF THE STORM PASSED 5 
TO 10 MILES SOUTH OF MAHNOMEN. THIS STORM HAS A HISTORY OF HAIL UP 
TO GOLFBALL IN SIZE.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TULABY LAKE AND BEAULIEU AROUND 500 AM CDT.
  NAYTAHWAUSH AROUND 505 AM CDT.
  MAHKONCE AROUND 510 AM CDT.
  FOSSTON...ROY LAKE AND PINE BEND AROUND 515 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE LONG LOST LAKE...ISLAND_LAKE...LOWER RICE LAKE...LENGBY...
ZERKEL AND EBRO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4717 9519 4709 9584 4738 9607 4741 9607
      4770 9554
TIME...MOT...LOC 0952Z 239DEG 31KT 4729 9585

$$

EWENS
501 
WWUS53 KFGF 101032
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
532 AM CDT TUE MAY 10 2011

MNC005-029-087-119-101042-
/O.EXP.KFGF.SV.W.0007.000000T0000Z-110510T1030Z/
MAHNOMEN MN-POLK MN-CLEARWATER MN-BECKER MN-
532 AM CDT TUE MAY 10 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BECKER...
SOUTHERN CLEARWATER...SOUTHEASTERN POLK AND MAHNOMEN COUNTIES IN
NORTHWEST MINNESOTA HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4717 9519 4709 9584 4738 9607 4741 9607
      4770 9554
TIME...MOT...LOC 0954Z 239DEG 31KT 4730 9583

$$

EWENS

The office that day

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

IssuedProductOfficeCountiesLasted
May 10, 2:43 AM CDTSevere Thunderstorm WarningFGFClay62 min
May 10, 3:30 AM CDTSevere Thunderstorm WarningFGFBecker, Clay, Mahnomen, Norman60 min
May 10, 5:27 AM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Hubbard63 min
May 10, 6:29 AM CDTSevere Thunderstorm WarningFGFBeltrami46 min
May 10, 6:37 AM CDTSevere Thunderstorm WarningFGFClearwater, Polk53 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011

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.