Alert archive / Minnesota / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 49, NWS Grand Forks, ND

July 21, 2014Polk County, Minnesota; Grand Forks County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 21, 2014, 7:48 PM CDT for Polk County, Minnesota; Grand Forks County, North Dakota. It was in force for 57 min. 14 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 21, 2014, 7:48 PM CDT (00:48 UTC)
Expired
Jul 21, 2014, 8:45 PM CDT
In force
57 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

The radar

The Fargo/Grand Forks radar (KMVX), 51 km from the middle of the area, began a volume at 00:50 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 21, 7:51 PM CDTTSTM WND GST 666 W Grand Forks, NDPEAK WINDS MEASURED AT THE GRAND FORKS INTERNATIONAL AIRPORT /KGFK/.
Jul 21, 7:58 PM CDTTSTM WND GST 696 W Grand Forks, NDPEAK WIND AT THE GRAND FORKS INTERNATIONAL AIRPORT. WINDOW DAMAGE REPORTED AT THE TERMINAL BUILDING.
Jul 21, 8:05 PM CDTTSTM WND GST 615 Nnw Grand Forks, NDPEAK WINDS MEASURED AT THE GRAND FORKS NDDOT WIND SENSOR ALONG I-29.
Jul 21, 8:15 PM CDTTSTM WND DMGGrand Forks, NDFIST SIZED...APPROX 3INCH DIAMETER...TREE BRANCH DOWN IN BACKYARD.
Jul 21, 8:15 PM CDTTSTM WND DMGGrand Forks, ND8 TO 10 INCH TREES DOWNED IN SOUTH GRAND FORKS 32ND AVE AND LEGEND LANE. TIME APPROXIMATE.
Jul 21, 8:17 PM CDTTSTM WND GST 586 W Grand Forks, NDPEAK WIND MEASURED AT THE GRAND FORKS INTERNATIONAL AIRPORT.
Jul 21, 8:35 PM CDTTSTM WND DMG2 N Thompson, NDTWO TREES...ONE 25 INCHES IN DIAMETER...THE OTHER 30 INCHES IN DIAMETER SNAPPED IN BACKYARD.
Jul 21, 8:35 PM CDTTSTM WND DMG2 N Thompson, NDTWO TREES...ONE 25 INCHES IN DIAMETER...THE OTHER 30 INCHES IN DIAMETER SNAPPED IN BACKYARD. POWER LINES KNOCKED DOWN IN THOMPSON.
Jul 21, 8:35 PM CDTTSTM WND DMGGrand Forks, ND3 TO 4 INCH TREE BRANCHES DOWN VICINITY OF GROUND ROUND ON 32 AV S. NUMEROUS SMALLER BRANCHES ON GROUND VICINITY OF POST OFFICE ON 28 AV S.
Jul 21, 8:35 PM CDTTSTM WND DMGGrand Forks, NDTREE DOWN IN RESIDENTS BACKYARD ON UNIVERSITY AV.
Jul 21, 8:38 PM CDTTSTM WND DMGHolmes, NDWIDESPREAD WIND DAMAGE NOTED IN SHELTER BELTS ACROSS UNION TOWNSHIP. NUMEROUS LARGE TREE BRANCHES AND LIMBS WERE BROKEN DOWN AND AN OCCASIONAL TREE TRUNK WAS SNAPPED.
Jul 21, 8:45 PM CDTTSTM WND DMG7 Ese Thompson, NDSEVERAL LARGE BRANCHES AND LIMBS BROKEN DOWN IN SHELTER BELTS ACROSS NORTHERN AMERICUS AND BENTRU TOWNSHIPS.
Jul 21, 8:55 PM CDTFUNNEL CLOUD7 W Crookston, MNFUNNEL CLOUD DESCENDED AND ASCENDED FROM ROTATING WALL CLOUD. RELAYED BY POLK S.O.
Jul 21, 8:55 PM CDTFUNNEL CLOUD8 Wsw Crookston, MNFUNNEL CLOUD DESCENDED AND ASCENDED FROM ROTATING WALL CLOUD. RELAYED BY POLK S.O.

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
Jul 21, 5:07 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 0.8 hours before the alert went out and 280 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 2014-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3234 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 2014-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
3234 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1331 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

100 
WUUS53 KFGF 220048
SVRFGF
MNC119-NDC035-220145-
/O.NEW.KFGF.SV.W.0049.140722T0048Z-140722T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
748 PM CDT MON JUL 21 2014

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL POLK COUNTY IN NORTHWEST MINNESOTA...
  EAST CENTRAL GRAND FORKS COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 845 PM CDT

* AT 745 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST
  OF GRAND FORKS...AND MOVING EAST AT 40 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE TO
           ROOFS...SIDING AND TREES.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  GRAND FORKS AND EAST GRAND FORKS AROUND 755 PM CDT.
  MALLORY AND BYGLAND AROUND 800 PM CDT.
  DAVIDSON AND FISHER AROUND 805 PM CDT.
  KEY WEST AND SHERACK AROUND 815 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ANGUS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM...ON THE LOWEST FLOOR OF
A BUILDING.

&&

LAT...LON 4811 9665 4771 9671 4771 9737 4791 9738
TIME...MOT...LOC 0047Z 252DEG 33KT 4788 9714

HAIL...1.00IN
WIND...60MPH

$$

HOPPES
1 follow-up statement
931 
WWUS53 KFGF 220101
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
801 PM CDT MON JUL 21 2014

MNC119-NDC035-220145-
/O.CON.KFGF.SV.W.0049.000000T0000Z-140722T0145Z/
GRAND FORKS ND-POLK MN-
801 PM CDT MON JUL 21 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
POLK AND EAST CENTRAL GRAND FORKS COUNTIES UNTIL 845 PM CDT...

AT 757 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR EAST GRAND
FORKS...AND MOVING EAST AT 40 MPH.

HAZARD...70 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED. AT 751 PM CDT 66 MPH WIND WAS REPORTED AT  
         THE GRAND FORKS AIRPORT. 

IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT CONSIDERABLE
         TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO MOBILE HOMES...
         ROOFS AND OUTBUILDINGS.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MALLORY AND DAVIDSON AROUND 805 PM CDT.
  FISHER AROUND 810 PM CDT.
  KEY WEST AND SHERACK AROUND 815 PM CDT.
  ANGUS AROUND 825 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM...ON THE LOWEST FLOOR OF
A BUILDING.

&&

LAT...LON 4811 9665 4771 9671 4771 9737 4791 9738
TIME...MOT...LOC 0100Z 252DEG 33KT 4792 9697

HAIL...1.00IN
WIND...70MPH

$$

HOPPES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 8:26 PM CDTFlash Flood WarningFGFPolk6 hr
Jul 21, 8:43 PM CDTSevere Thunderstorm WarningFGFClay, Norman, Polk46 min
Jul 21, 8:58 PM CDTTornado WarningFGFPennington, Polk, Red Lake47 min
Jul 21, 9:08 PM CDTTornado WarningFGFNorman, Polk33 min
Jul 21, 9:15 PM CDTSevere Thunderstorm WarningFGFBecker, Beltrami, Clay, Clearwater, Mahnomen, Marshall and 4 more60 min
Jul 21, 10:01 PM CDTSevere Thunderstorm WarningFGFBecker, Beltrami, Clearwater, Hubbard, Lake of the Woods, Mahnomen and 3 more59 min
Jul 21, 10:14 PM CDTSpecial Weather StatementFGFGrant46 min
Jul 21, 10:32 PM CDTFlash Flood WarningFGFMarshall, Pennington, Polk, Red Lake8 hr
Jul 21, 11:01 PM CDTSpecial Weather StatementFGFWadena29 min
Jul 21, 11:10 PM CDTHigh Wind WarningFGFMahnomen, Norman, Pennington, Polk, Red Lake5 hr
Jul 22, 12:08 AM CDTAreal Flood AdvisoryFGFBeltrami, Lake of the Woods, Roseau7 hr
Jul 22, 6:28 AM CDTRiver Flood WarningFGFMarshall42 hr
Jul 22, 6:28 AM CDTRiver Flood WarningFGFMarshall3 days
Jul 21, 7:03 PM CDTSevere Thunderstorm WarningFGFGrand Forks27 min
Jul 21, 7:26 PM CDTSevere Thunderstorm WarningFGFBarnes, Eddy, Griggs, Nelson, Steele64 min
Jul 21, 7:30 PM CDTSevere Thunderstorm WarningFGFGrand Forks60 min
Jul 21, 7:38 PM CDTTornado WarningFGFEddy, Griggs, Nelson, Steele37 min
Jul 21, 8:09 PM CDTSevere Thunderstorm WarningFGFBarnes, Cass, Grand Forks, Griggs, Nelson, Steele and 2 more66 min
Jul 21, 8:29 PM CDTTornado WarningFGFGrand Forks46 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2014Severe Thunderstorm Warnings in North Dakota, 2014Every severe thunderstorm warning in 2014

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.