Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 253, NWS Grand Forks, ND

July 31, 2001Marshall County, Pennington County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 9:00 PM CDT for Marshall County, Pennington County, Minnesota. It was in force for 30 min. 1 report 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, 9:00 PM CDT (02:00 UTC)
Expired: Jul 31, 2001, 9:30 PM CDT
In force: 30 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Marshall County, MN, Pennington County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 113 km from the middle of the area, began a volume at 02:03 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 31, 9:00 PM CDT	Hail 0.75	Goodridge, MN

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 4:00 PM CDT	Tornado Watch	SPC	6 hr
Jul 31, 8:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 2.0 hours before the alert went out and 218 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: 1223 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 558 m²/s²
0-3 km storm-relative helicity: 694 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 26.2

Open this sounding in Storm Lab

The text

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

881 
WUUS53 KFGF 010200
SVRFAR
MNC089-113-010230-

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

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHEASTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA AND
  NORTHEASTERN PENNINGTON COUNTY IN NORTHWEST MINNESOTA.

* UNTIL 930 PM CDT.

* AT 858 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES SOUTHEAST OF GOODRIDGE...OR ABOUT 20
  MILES EAST OF THIEF RIVER FALLS...MOVEMENT WAS TO THE NORTHEAST AT
  35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  ESPELIE AT 905 PM CDT AND
  GRYGLA AT 915 PM CDT.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR NORTHWESTERN MINNESOTA AND EASTERN NORTH DAKOTA.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT
WEDNESDAY MORNING FOR NORTHWESTERN MINNESOTA.


$$

14

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What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 31, 8:58 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 31, 8:58 PM CDT, 2 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
858 PM CDT TUE JUL 31 2001

...FORECAST CONCERNS TONIGHT ARE ONGOING TSTMS AND POTENTIAL
   FLOODING IN MN...

02Z SFC ANALYSIS SHOWING TROF/WIND SHIFT ALONG A ROX-CKN-ABR LINE.
ONGOING TSTM ACTIVITY CONTINUES TO BUILD INTO NORTH CENTRAL MN
ASSOCIATED WITH ISALLOBARIC FALL CENTER LIFTING NE INTO ONTARIO.
00Z SOUNDINGS AND SFC DEW POINTS CONTINUE TO SHOW ABUNDANT MOISTURE
EAST OF THE RED RIVER VALLEY. THUS...WILL KEEP THOSE AREAS IN
FLASH FLOOD WATCH. AREAS IN ND APPEAR TO BE SAFE FROM ADDITIONAL
HEAVY RAINFALL. THUS...WILL DROP FLASH FLOOD WATCH FOR ND COUNTIES.
LOW LEVEL CLOUDINESS WORKING DOWN INTO DVL AREA. WILL ADJUST ZONE
WORDING AND MENTION PATCHY FOG FORMATION LATE.

UPDATED ZONES OUT BY 930 PM.

.FGF...SVR TSTM WATCH 848 UNTIL 2 AM FOR ALL MN COUNTIES EXCEPT
       KITTSON...ROSEAU...LAKE OF THE WOODS....MARSHALL AND GRANT.
       FLASH FLOOD WATCH FOR ALL MN COUNTIES TONIGHT.

BRAMER

In the hours before

Local storm report, Jul 31, 5:15 PM CDT, 3 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
515 PM CDT TUE JUL 31 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0425 AM    12 ESE ADA                MN   WIND DAMAGE
07/31/01   NORMAN                         LARGE BRANCHES DOWN IN
                                          TWIN VALLEY

0445 AM    HALSTAD                   MN   WIND DAMAGE
07/31/01   NORMAN                         DOWNED POWER POLES

0455 AM    1 E GULLY                 MN   WIND DAMAGE
07/31/01   POLK                           TREES DOWN ALONG HWY 92

0230 PM    5 NW GRYGLA               MN   .75 INCH HAIL
07/31/01   MARSHALL                       HAIL FOR 5 MINUTES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 7:30 PM CDT	Severe Thunderstorm Warning	FGF	Polk, Red Lake	30 min
Jul 31, 7:58 PM CDT	Severe Thunderstorm Warning	FGF	Polk	32 min
Jul 31, 8:08 PM CDT	Severe Thunderstorm Warning	FGF	Clearwater	52 min
Jul 31, 8:23 PM CDT	Severe Thunderstorm Warning	FGF	Pennington	37 min
Jul 31, 8:43 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami	32 min
Jul 31, 10:05 PM CDT	Flash Flood Warning	FGF	Clearwater	5 hr
Jul 31, 11:10 PM CDT	Flash Flood Warning	FGF	Beltrami, Lake of the Woods	4 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2001 Every 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.