Alert archive / Minnesota / Tornado Warnings in 2014

Tornado Warning 18, NWS Grand Forks, ND

July 21, 2014Pennington County, Polk County, Red Lake County, Minnesota

NWS Grand Forks, ND issued this tornado warning at Jul 21, 2014, 8:58 PM CDT for Pennington County, Polk County, Red Lake County, Minnesota. It was in force for 47 min. 9 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, 8:58 PM CDT (01:58 UTC)
Expired
Jul 21, 2014, 9:45 PM CDT
In force
47 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Pennington County, MN, Polk County, MN, Red Lake County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 71 km from the middle of the area, began a volume at 02:00 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, 9:10 PM CDTTSTM WND DMGCrookston, MNMULTIPLE TREES DOWN VICINITY OF BEET PLANT.
Jul 21, 9:10 PM CDTTSTM WND GST 80Crookston, MNPERSONAL WEATHER STATION REPORTED AT LEAST 80 MPH. MULTIPLE 8 INCH DIAMETER TREES DOWN.
Jul 21, 9:20 PM CDTTSTM WND DMGCrookston, MNMULTIPLE TREES DOWN VICINITY OF BEET PLANT.
Jul 21, 9:20 PM CDTTSTM WND DMGGentilly, MN4 INCH DIAMETER TREE BRANCHES DOWN. STORM WINDOW BLOWN OFF HOUSE.
Jul 21, 9:20 PM CDTTSTM WND DMGGentilly, MN4 INCH DIAMETER TREE BRANCHES DOWN.STORM WINDOW BLOWN OFF HOUSE.
Jul 21, 9:20 PM CDTTSTM WND GST 80Crookston, MNPERSONAL WEATHER STATION REPORTED AT LEAST 80 MPH. MULTIPLE 8 INCH DIAMETER TREES DOWN.
Jul 21, 9:22 PM CDTTSTM WND DMG2 Nw Dorothy, MNSEVERAL LARGE 4 TO 6 INCH DIAMETER TREE BRANCHES BROKEN DOWN IN SHELTER BELTS.
Jul 21, 9:30 PM CDTTSTM WND DMGGentilly, MN4 INCH DIAMETER TREE BRANCHES DOWN.STORM WINDOW BLOWN OFF HOUSE.
Jul 21, 9:35 PM CDTTSTM WND DMGRed Lake Falls, MNNUMEROUS TREES DOWN IN CITY AND POWER IS OUT.

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, 2.0 hours before the alert went out and 251 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.

470 
WFUS53 KFGF 220158
TORFGF
MNC113-119-125-220245-
/O.NEW.KFGF.TO.W.0018.140722T0158Z-140722T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
858 PM CDT MON JUL 21 2014

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN PENNINGTON COUNTY IN NORTHWEST MINNESOTA...
  CENTRAL POLK COUNTY IN NORTHWEST MINNESOTA...
  WESTERN RED LAKE COUNTY IN NORTHWEST MINNESOTA...

* UNTIL 945 PM CDT

* AT 857 PM CDT...A SEVERE SQUALL LINE CAPABLE OF PRODUCING TORNADOES
  THAT MAY NOT BE VISIBLE DUE TO HEAVY RAIN WAS LOCATED NEAR
  FISHER...AND MOVING NORTHEAST AT 35 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.

* THIS DANGEROUS STORM WILL BE NEAR...
  CROOKSTON AROUND 910 PM CDT.
  GENTILLY AROUND 920 PM CDT.
  HUOT AND DOROTHY AROUND 930 PM CDT.
  WYLIE AND RED LAKE FALLS AROUND 940 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN GRAND
FORKS.

&&

LAT...LON 4806 9638 4779 9617 4766 9679 4776 9688
TIME...MOT...LOC 0158Z 237DEG 30KT 4775 9677

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

JR
2 follow-up statements
151 
WWUS53 KFGF 220217
SVSFGF

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

MNC113-119-125-220245-
/O.CON.KFGF.TO.W.0018.000000T0000Z-140722T0245Z/
PENNINGTON MN-RED LAKE MN-POLK MN-
917 PM CDT MON JUL 21 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL POLK...WESTERN RED
LAKE AND SOUTHWESTERN PENNINGTON COUNTIES UNTIL 945 PM CDT...

AT 915 PM CDT...A SEVERE SQUALL LINE CAPABLE OF PRODUCING TORNADOES
THAT MAY NOT BE VISIBLE DUE TO HEAVY RAIN WAS LOCATED NEAR HUOT...AND
MOVING NORTHEAST AT 50 MPH.

HAZARD...TORNADO AND QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.

THE DANGEROUS STORM WILL BE NEAR...
  RED LAKE FALLS AROUND 925 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN GRAND
FORKS.

&&

LAT...LON 4775 9641 4795 9656 4806 9638 4779 9617
TIME...MOT...LOC 0217Z 241DEG 45KT 4788 9639

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

JR
274 
WWUS53 KFGF 220241
SVSFGF

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

MNC113-119-125-220251-
/O.EXP.KFGF.TO.W.0018.000000T0000Z-140722T0245Z/
PENNINGTON MN-RED LAKE MN-POLK MN-
941 PM CDT MON JUL 21 2014

...THE TORNADO WARNING FOR CENTRAL POLK...WESTERN RED LAKE AND
SOUTHWESTERN PENNINGTON COUNTIES WILL EXPIRE AT 945 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.  HOWEVER...GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4775 9641 4795 9656 4806 9638 4779 9617
TIME...MOT...LOC 0241Z 241DEG 45KT 4802 9600

$$

JR

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 7:48 PM CDTSevere Thunderstorm WarningFGFPolk57 min
Jul 21, 8:26 PM CDTFlash Flood WarningFGFPolk6 hr
Jul 21, 8:43 PM CDTSevere Thunderstorm WarningFGFClay, Norman, Polk46 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

Nearby

Tornado Warnings in Minnesota, 2014Every tornado warning in 2014Tornadoes 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.