Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 168, NWS Grand Forks, ND

August 1, 2002Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 1, 2002, 12:53 AM CDT for Cass County, North Dakota. It was in force for 37 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: Aug 1, 2002, 12:53 AM CDT (05:53 UTC)
Expired: Aug 1, 2002, 1:30 AM CDT
In force: 37 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 66 km from the middle of the area, began a volume at 05:53 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
Aug 1, 1:15 AM CDT	Hail 1	Page, ND
Aug 1, 1:35 AM CDT	Hail 1	Gardner, ND

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, 6:25 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.9 hours before the alert went out and 243 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: 3338 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 1589 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

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

024 
WUUS53 KFGF 010553
SVRFAR
NDC017-010630-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
1252 AM CDT THU AUG 1 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 130 AM CDT.

* AT 1248 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 9 MILES NORTHWEST OF PAGE...OR ABOUT 23 MILES
  NORTHEAST OF VALLEY CITY...MOVEMENT WAS TO THE EAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  PAGE AT 1255 AM...
  ERIE AT 105 AM...
  HUNTER AT 110 AM AND
  GRANDIN AT 120 AM.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM THURSDAY
MORNING FOR NORTHWESTERN MINNESOTA AND EASTERN NORTH DAKOTA.

23
NNNN

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, 8:55 PM CDT, 3 hours 58 minutes earlier.

Area forecast discussion, Jul 31, 8:55 PM CDT, 3 hours 58 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
855 PM CDT WED JUL 31 2002

FORECAST CHALLENGE FOR TONIGHT IS SEVERE WEATHER. KMVX HAS NUMEROUS
SEVERE STORMS MOVING THROUGH E ND INTO NW MN. WITH COLD FRONT
EXTENDING THROUGH ND ALONG A LANGDON TO BAKER TO BISMARCK LINE...
STILL HAVE A LONG TIME TO GO BEFORE EXPECT SEVERE TO BE OUT OF AREA.
WITH WATCH OVER DEVILS LAKE AREA EXPECTED TO EXPIRE AT 9 PM...AND
LINE OF SEVERE CLOSE TO EXIT THAT AREA...TIMING FOR WATCH EXPIRATION
LOOKS GOOD. REMAINDER OF AREA STILL UNDER SEVERE THUNDERSTORM WATCH
UNTIL 1 AM...WITH LOADED GUN SOUNDINGS...STRONG SURFACE BOUNDARY...
JET SUPPORT...DARKENING ON WATER VAPOR STARTING TO SHOW UP...ETC
...SO WATCH FOR REMAINDER OF AREA UNTIL 1 AM STILL LOOKS GOOD.
CONSEQUENTLY...CURRENT FORECAST WELL IN HAND. WILL ONLY NEED TO MAKE
MINOR CHANGES.

.FGF...NONE.

NG

In the hours before

Local storm report, Jul 31, 7:47 PM CDT, 5 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
747 PM CDT WED JUL 31 2002

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

0639 AM    CHURCHS FERRY             ND   .75 INCH HAIL
07/31/02   RAMSEY

0610 PM    5 N LEEDS                 ND   1.75 INCH HAIL
07/31/02   BENSON

0618 PM    LEEDS                     ND   1.00 INCH HAIL
07/31/02   BENSON

0618 PM    4 E LEEDS                 ND   2.00 INCH HAIL
07/31/02   BENSON

0627 PM    CHURCHS FERRY             ND   .75 INCH HAIL
07/31/02   RAMSEY

0720 PM    2 N DEVILS LAKE           ND   .75 INCH HAIL
07/31/02   RAMSEY                         WALL CLOUD

0720 PM    MADDOCK                   ND   1.00 INCH HAIL
07/31/02   BENSON                         GROUND COVERED TOTALLY
                                          WHITE

0730 PM    2 NW DEVILS LAKE          ND   1.00 INCH HAIL
07/31/02   RAMSEY

ME

Local storm report, Jul 31, 7:47 PM CDT, 5 hours 6 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GRAND FORKS, ND
747 PM CDT WED JUL 31 2002

...CORRECTED TIME OF FIRST REPORT...

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

0639 PM    CHURCHS FERRY             ND   .75 INCH HAIL
07/31/02   RAMSEY

0610 PM    5 N LEEDS                 ND   1.75 INCH HAIL
07/31/02   BENSON

0618 PM    LEEDS                     ND   1.00 INCH HAIL
07/31/02   BENSON

0618 PM    4 E LEEDS                 ND   2.00 INCH HAIL
07/31/02   BENSON

0627 PM    CHURCHS FERRY             ND   .75 INCH HAIL
07/31/02   RAMSEY

0720 PM    2 N DEVILS LAKE           ND   .75 INCH HAIL
07/31/02   RAMSEY                         WALL CLOUD

0720 PM    MADDOCK                   ND   1.00 INCH HAIL
07/31/02   BENSON                         GROUND COVERED TOTALLY
                                          WHITE

0730 PM    2 NW DEVILS LAKE          ND   1.00 INCH HAIL
07/31/02   RAMSEY

ME

Local storm report, Jul 31, 11:43 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
1143 PM CDT WED JUL 31 2002

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

0735 PM    LANKIN                    ND   FLOOD
07/31/02   WALSH                          STREET FLOODING DUE TO
                                          HEAVY RAINS

0737 PM    LANKIN                    ND   70 MPH TSTORM WIND
07/31/02   WALSH

0740 PM    DEVILS LAKE               ND   .75 INCH HAIL
07/31/02   RAMSEY                         FUNNEL CLOUD REPORTED BY
                                          COOPERATIVE OBSERVER

0805 PM    LANKIN                    ND   1.00 INCH HAIL
07/31/02   WALSH                          WIND DAMAGE

0902 PM    GRAFTON                   ND   FLOOD
07/31/02   WALSH                          STREET FLOODING DUE TO
                                          HEAVY RAINS

ME

Local storm report, Jul 31, 11:43 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GRAND FORKS, ND
1143 PM CDT WED JUL 31 2002

...CORRECTED TIME OF SECOND REPORT...

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

0735 PM    LANKIN                    ND   FLOOD
07/31/02   WALSH                          STREET FLOODING DUE TO
                                          HEAVY RAINS

0757 PM    LANKIN                    ND   70 MPH TSTORM WIND
07/31/02   WALSH

0740 PM    DEVILS LAKE               ND   .75 INCH HAIL
07/31/02   RAMSEY                         FUNNEL CLOUD REPORTED BY
                                          COOPERATIVE OBSERVER

0805 PM    LANKIN                    ND   1.00 INCH HAIL
07/31/02   WALSH                          WIND DAMAGE

0902 PM    GRAFTON                   ND   FLOOD
07/31/02   WALSH                          STREET FLOODING DUE TO
                                          HEAVY RAINS

ME

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 7:03 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey	42 min
Jul 31, 7:19 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	41 min
Jul 31, 7:33 PM CDT	Severe Thunderstorm Warning	FGF	Benson	42 min
Jul 31, 7:36 PM CDT	Tornado Warning	FGF	Ramsey	39 min
Jul 31, 7:40 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	50 min
Jul 31, 8:06 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	54 min
Jul 31, 8:24 PM CDT	Severe Thunderstorm Warning	FGF	Nelson	51 min
Jul 31, 8:26 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	49 min
Jul 31, 11:41 PM CDT	Severe Thunderstorm Warning	FGF	Eddy	49 min
Aug 1, 12:09 AM CDT	Severe Thunderstorm Warning	FGF	Griggs	51 min
Aug 1, 12:40 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Steele, Traill	50 min
Aug 1, 1:33 AM CDT	Severe Thunderstorm Warning	FGF	Cass	42 min
Aug 1, 1:37 AM CDT	Severe Thunderstorm Warning	FGF	Barnes	23 min
Aug 1, 2:11 AM CDT	Severe Thunderstorm Warning	FGF	Cass	49 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2002 Every severe thunderstorm warning in 2002

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.