Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 239, NWS Grand Forks, ND

July 31, 2001Beltrami County, Marshall County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 2:15 PM CDT for Beltrami County, Marshall County, Minnesota. It was in force for 30 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 31, 2001, 2:15 PM CDT (19:15 UTC)
Expired
Jul 31, 2001, 2:45 PM CDT
In force
30 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Beltrami County, MN, Marshall County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 144 km from the middle of the area, began a volume at 19:14 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 31, 2:30 PM CDTHail 0.75Grygla, MN
Jul 31, 2:45 PM CDTThunderstorm WindThorhult, MNTree branches were blown down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 7.3 hours before the alert went out and 180 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 2001-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2851 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 12:00Z on 2001-07-31The 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
2851 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
485 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 311915
SVRFAR

MNC007-089-311945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
215 PM CDT TUE JUL 31 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHWESTERN BELTRAMI COUNTY IN NORTH CENTRAL MINNESOTA AND        
  EASTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 245 PM CDT.

* AT 209 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES SOUTHWEST OF GATZKE...OR ABOUT 21 MILES
  NORTHEAST OF THIEF RIVER FALLS...MOVEMENT WAS TO THE EAST AT 45
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  GRYGLA AT 220 PM CDT AND
  GATES CORNER AT 240 PM CDT.

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


$$

14

NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 4:11 AM CDTSevere Thunderstorm WarningFGFNorman, Polk34 min
Jul 31, 4:11 AM CDTSevere Thunderstorm WarningFGFPennington, Red Lake34 min
Jul 31, 4:11 AM CDTSevere Thunderstorm WarningFGFMarshall34 min
Jul 31, 4:47 AM CDTSevere Thunderstorm WarningFGFPennington, Polk, Red Lake28 min
Jul 31, 4:47 AM CDTSevere Thunderstorm WarningFGFBeltrami, Kittson, Marshall, Roseau28 min
Jul 31, 4:47 AM CDTSevere Thunderstorm WarningFGFClearwater28 min
Jul 31, 5:37 AM CDTSevere Thunderstorm WarningFGFBeltrami, Lake of the Woods38 min
Jul 31, 11:21 AM CDTSevere Thunderstorm WarningFGFPolk39 min
Jul 31, 11:57 AM CDTSevere Thunderstorm WarningFGFPennington, Polk, Red Lake48 min
Jul 31, 12:11 PM CDTSevere Thunderstorm WarningFGFMarshall64 min
Jul 31, 12:43 PM CDTSevere Thunderstorm WarningFGFPennington32 min
Jul 31, 12:46 PM CDTSevere Thunderstorm WarningFGFBeltrami, Lake of the Woods59 min
Jul 31, 1:20 PM CDTSevere Thunderstorm WarningFGFPennington, Polk25 min
Jul 31, 1:35 PM CDTSevere Thunderstorm WarningFGFMarshall40 min
Jul 31, 1:44 PM CDTSevere Thunderstorm WarningFGFLake of the Woods31 min
Jul 31, 4:35 PM CDTFlash Flood WarningFGFMarshall6 hr
Jul 31, 4:39 PM CDTFlash Flood WarningFGFPolk4 hr
Jul 31, 4:54 PM CDTSevere Thunderstorm WarningFGFPolk51 min
Jul 31, 5:16 PM CDTSevere Thunderstorm WarningFGFLake of the Woods, Roseau44 min
Jul 31, 5:39 PM CDTTornado WarningFGFBeltrami, Lake of the Woods36 min
Jul 31, 6:05 PM CDTFlash Flood WarningFGFBeltrami, Lake of the Woods, Marshall, Roseau6 hr
Jul 31, 6:13 PM CDTSevere Thunderstorm WarningFGFClay32 min
Jul 31, 6:15 PM CDTTornado WarningFGFLake of the Woods30 min
Jul 31, 6:23 PM CDTFlash Flood WarningFGFPennington, Polk, Red Lake6 hr
Jul 31, 6:24 PM CDTSevere Thunderstorm WarningFGFNorman36 min
Jul 31, 6:54 PM CDTSevere Thunderstorm WarningFGFPolk, Red Lake36 min
Jul 31, 6:58 PM CDTSevere Thunderstorm WarningFGFNorman32 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.