Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 229, NWS Grand Forks, ND

July 31, 2001Traill County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 10:52 AM CDT for Traill County, North Dakota. It was in force for 38 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, 10:52 AM CDT (15:52 UTC)
Expired: Jul 31, 2001, 11:30 AM CDT
In force: 38 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Traill County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 15 km from the middle of the area, began a volume at 15:52 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, 11:08 AM CDT	Thunderstorm Wind	Hatton, ND	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

Bismarck Municip, ND (KBIS), launched 12:00Z, 3.9 hours before the alert went out and 278 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: 381 J/kg
Mixed-layer CIN: -626 J/kg
Mixed-layer LCL: 1544 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 109 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.

000 
WUUS53 KFGF 311552
SVRFAR

NDC097-311630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
1052 AM CDT TUE JUL 31 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHWESTERN TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 1130 AM CDT.

* AT 1047 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES SOUTHWEST OF HATTON...OR ABOUT 35 MILES
  SOUTHWEST OF GRAND FORKS...MOVEMENT WAS TO THE NORTHEAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  HATTON AT 1055 AM AND
  REYNOLDS AT 1105 AM.

REMEMBER SEVERE THUNDERSTORMS CAN AN]D OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.


$$

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, 10:30 AM CDT, 22 minutes earlier.

Area forecast discussion, Jul 31, 10:30 AM CDT, 22 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1030 AM CDT TUE JUL 31 2001

FORECAST CHALLENGE FOR TODAY IS PCPN. CURRENT SATELLITE IMAGERY
SHOWS CWFA BASICALLY CLOUDY WITH TSRA IN ND SIDE OF CWFA. KMVX
SHOWING TSRA COMPLEX MOVING INTO RED RIVER VALLEY. LATEST MSAS SFC
PRESSURE ANALYSIS HAS LOW PRESSURE IN CENTRAL ND...WITH FRONT
EXTENDING ALONG A JMS-GFK-HCO LINE. WHEN COMPARING INITIALIZATION
CONDITIONS TO MODELS...ETA BEST MATCH. WITH PW'S AROUND 2.O
INCH...GOOD 850 MB LLJ...THETA-E RIDGE...AND 700MB TROF
APPROACHING...TSRA WITH HEAVY RAIN STILL LOOKS GOOD AS WELL AS SOME
SVR. THEREFORE...CURRENT FORECAST PRETTY WELL IN HAND. ONLY MINOR
CHANGES NEEDED.

.FGF...FLASH FLOOD WATCH FULL CWFA TODAY.

NG

In the hours before

Local storm report, Jul 31, 6:05 AM CDT, 4 hours 47 minutes before

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

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

0240 AM    VALLEY CITY               ND   WIND DAMAGE
07/31/01   BARNES                         TREES DOWN

0357 AM    HALSTAD                   MN   67 MPH TSTM GUST
07/31/01   NORMAN

0417 AM    HAWLEY                    MN   .88 INCH HAIL
07/31/01   CLAY

0425 AM    CROOKSTON                 MN   WIND DAMAGE
07/31/01   POLK                           4-5 INCH DIAMETER LIMBS
                                          DOWN

0425 AM    GENTILLY                  MN   WIND DAMAGE
07/31/01   POLK                           4-5 INCH DIAMETER LIMBS
                                          DOWN

Special weather statement, Jul 31, 6:47 AM CDT, 4 hours 5 minutes before

MNZ001>009-013>017-022>024-027-028-311250-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
647 AM CDT TUE JUL 31 2001

...SEVERE THUNDERSTORM WATCH NUMBER 645 FOR NORTHWEST MINNESOTA HAS
BEEN CANCELLED....

THE SEVERE THUNDERSTORMS HAVE MOVED OUT OF NORTHWEST MINNESOTA AND
HAVE WEAKENED.  THUS THE SEVERE THUNDERSTORM WATCH THAT WAS IN
EFFECT UNTIL 8 AM CDT FOR BELTRAMI...LAKE OF THE WOODS...ROSEAU...
KITTSON...MARSHALL...PENNINGTON...RED LAKE...POLK...HUBBARD...
CLEARWATER...NORMAN...MAHNOMEN...BECKER AND CLAY COUNTIES HAS BEEN
CANCELLED.

RIDDLE

Special weather statement, Jul 31, 6:59 AM CDT, 3 hours 53 minutes before

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-311455-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
659 AM CDT TUE JUL 31 2001

...SCATTERED SEVERE THUNDERSTORMS EXPECTED LATE THIS AFTERNOON AND
EVENING FROM THE RED RIVER VALLEY EAST INTO MINNESOTA...

SYNOPSIS...LOW PRESSURE WILL MOVE NORTHEAST INTO EASTERN NORTH
DAKOTA AND STRENGTHEN THIS AFTERNOON.  THE LOW WILL THEN MOVE
INTO MANITOBA THIS EVENING WITH A COLD FRONT MOVING EAST INTO
MINNESOTA. THE ATMOSPHERE OVER EASTERN NORTH DAKOTA AND NORTHWEST
MINNESOTA IS VERY UNSTABLE AND VERY MOIST.  AS THE LOW AND FRONT
INTERACT WITH THIS AIRMASS LATER TODAY AND EARLY EVENING
THUNDERSTORMS ARE EXPECTED TO RE-DEVELOP WITH SOME SEVERE
THUNDERSTORMS LIKELY.

AREA OF CONCERN...THERE IS A SLIGHT RISK OF SEVERE WEATHER EAST OF
A PEMBINA TO LAKOTA TO VALLEY CITY NORTH DAKOTA LINE...THEN
EAST TO INCLUDE ALL THE RED RIVER VALLEY AND NORTHWEST AND WEST
CENTRAL MINNESOTA.

TIME...BETWEEN 3 PM AND MIDNIGHT CDT.

TYPE OF HAZARD...HEAVY RAIN...STRONG WINDS...AND LARGE HAIL.

RIDDLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 2:37 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Cass, Griggs, Steele	23 min
Jul 31, 3:26 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele, Traill	34 min
Jul 31, 10:14 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele	46 min
Jul 31, 10:29 AM CDT	Flash Flood Warning	FGF	Grand Forks, Griggs, Steele	3 hr
Jul 31, 10:59 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Steele	46 min
Jul 31, 4:39 PM CDT	Flash Flood Warning	FGF	Grand Forks	4 hr
Jul 31, 4:41 PM CDT	Severe Thunderstorm Warning	FGF	Cass	49 min
Jul 31, 4:54 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	51 min
Jul 31, 4:58 PM CDT	Severe Thunderstorm Warning	FGF	Traill	32 min
Jul 31, 6:13 PM CDT	Severe Thunderstorm Warning	FGF	Cass	32 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 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.