Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 334, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 17, 2001, 4:35 PM CDT for Clay County, Norman County, Minnesota; Cass County, Traill County, North Dakota. It was in force for 40 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Aug 17, 2001, 4:35 PM CDT (21:35 UTC)
- Expired
- Aug 17, 2001, 5:15 PM CDT
- In force
- 40 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Clay County, MN, Norman County, MN, Cass County, ND, Traill County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 55 km from the middle of the area, began a volume at 21:37 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 17, 4:40 PM CDT | Hail 0.75 | Hillsboro, 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 nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 9.6 hours before the alert went out and 284 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1722 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
318 WUUS53 KFGF 172136 SVRFAR MNC027-107-NDC017-097-172215- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 435 PM CDT FRI AUG 17 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN CLAY COUNTY IN NORTHWEST MINNESOTA... WESTERN NORMAN COUNTY IN NORTHWEST MINNESOTA... EASTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA AND SOUTHEASTERN TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA. * UNTIL 515 PM CDT. * AT 431 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES WEST OF HALSTAD...OR ABOUT 32 MILES NORTH OF FARGO...MOVEMENT WAS TO THE SOUTHEAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HENDRUM AT 445 PM... PERLEY AT 455 PM... GEORGETOWN AT 505 PM AND KRAGNES AT 515 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4743 9685 4734 9708 4683 9672 4695 9640 $$ 7 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 Aug 17, 2:55 PM CDT, 1 hour 40 minutes earlier.
Area forecast discussion, Aug 17, 2:55 PM CDT, 1 hour 40 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 255 PM CDT FRI AUG 17 2001 DISCUSSION ABREVIATED DUE TO SEVERE WEATHER IN AREA. FCST CHALLENGE...DURATION OF CONVECTION INTO THIS EVENING IN NW MN. NEAR TERM/ANALYSIS...SFC CDFRNT EXTENDING FM SFC LOW IN WRN ONT...VCNTY GFK...INTO NWRN SD....AND DROPPING SWD THROUGH THE FGF CWFA ATTM. CONVECTION HAS INTENSIFIED ALG AND AHD OF THIS FRONT FM DVL TO BJI...IN AREA OF MAX INSTABILITY. AREA PROGRESSES SWD THROUGH THE REMAINDER OF THE AFTERNOON AND EARLY EVENING...SO WILL INCLUDE MENTION OF EVENING STORMS ALG AND SOUTH OF A VALLEY CITY...MAYVILLE...TVF AND BDE LINE. AVN AND ETA HAVE SOME INITIAL DISPARITY THROUGH 00Z BUT LINE UP WELL 12-60HRS. EXPECT CLEARING RRV AND WEST TNGT WITH SOME RESIDUAL MVFR-VFR CIGS IN NW MN THROUGH THE OVERNIGHT HOURS. NWLY WINDS ROX-DTL-PKD LIKELY TO GO CALM AT SFC SO AREAS PATCHY FOG EXPECTED. SATURDAY...EXPECT LOW CLDS TO BREAK AND SCATTER THROUGH MIDDAY OVR NW MN...WITH MOSTLY CLEAR SKIES ELSEWHERE. SFC HIGH PRES DOMINATES SRN MAN INTO ND/MN AREA WITH LIGHT NLY BLAYER FLOW THROUGH DAY ON SAT. RETURN SLY FLOW DEVELOPS SUNDAY AHD OF APPROACHING SFC TROF. WILL INCLUDE SUN PM GROUP FOR TSTMS. WILL GO WITH SLIGHTLY WARMER NGM MOS TEMPS TROUGH PACKAGE. EXTENDED...MRF...UKMET AND CANADIAN MODELS SIMILAR...WITH ECMWF QUITE DIFFERENT. UPPER LEVEL W FLOW DOMINATES...WITH STG SHRTWV ACTIVITY THROUGH EXTENDED PERIOD. EACH DAY HAS TSTM EXPECTATION WITH SIG MCS AND ADDN HEAVY RAINS SUGGESTED TUES PM INTO WED. .FGF...NONE. GUST/NG
In the hours before
Local storm report, Aug 17, 4:08 PM CDT, 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
408 PM CDT FRI AUG 17 2001
CORRECTION FOR HAIL SIZE
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0208 PM 4 SE HOOPLE ND .75 INCH HAIL
08/17/01 WALSH
0213 PM NASH ND .75 INCH HAIL
08/17/01 WALSH
0235 PM 3 N ROSEWOOD MN .75 INCH HAIL
08/17/01 MARSHALL
0255 PM 3 SW THIEF RIVER FALLS MN .75 INCH HAIL
08/17/01 PENNINGTON
0305 PM DRAYTON ND .75 INCH HAIL
08/17/01 PEMBINA
0310 PM DOROTHY MN .75 INCH HAIL
08/17/01 RED LAKE
0315 PM 6 SE EUCLID MN 1.50 INCH HAIL
08/17/01 POLK WALNUT SIZE HAIL
0315 PM 2 NE OAKWOOD ND .75 INCH HAIL
08/17/01 WALSH
0320 PM 1 NE HUOT MN .75 INCH HAIL
08/17/01 RED LAKE
0335 PM PLUMMER MN .75 INCH HAIL
08/17/01 RED LAKE
0340 PM MINTO ND .75 INCH HAIL
08/17/01 WALSH
0340 PM 4 N LUVERNE ND 1.25 INCH HAIL
08/17/01 STEELE DIME TO HALF DOLLAR SIZE
HAIL
0340 PM 1 S BROOKS MN 1.75 INCH HAIL
08/17/01 RED LAKE GOLF BALL SIZE HAIL
NNNNThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 1:53 PM CDT | Severe Thunderstorm Warning | FGF | Kittson | 52 min |
| Aug 17, 2:14 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami | 46 min |
| Aug 17, 2:27 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Pennington | 48 min |
| Aug 17, 3:04 PM CDT | Severe Thunderstorm Warning | FGF | Kittson, Marshall | 41 min |
| Aug 17, 3:07 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 38 min |
| Aug 17, 3:19 PM CDT | Severe Thunderstorm Warning | FGF | Roseau | 41 min |
| Aug 17, 3:23 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 52 min |
| Aug 17, 4:00 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater, Hubbard | 45 min |
| Aug 17, 4:02 PM CDT | Severe Thunderstorm Warning | FGF | Marshall, Roseau | 43 min |
| Aug 17, 4:10 PM CDT | Severe Thunderstorm Warning | FGF | Mahnomen, Polk | 50 min |
| Aug 17, 4:20 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 40 min |
| Aug 17, 4:41 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 49 min |
| Aug 17, 4:43 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wilkin | 47 min |
| Aug 17, 4:46 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Clearwater, Hubbard | 44 min |
| Aug 17, 4:56 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 49 min |
| Aug 17, 5:10 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 50 min |
| Aug 17, 5:17 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard, Wadena | 43 min |
| Aug 17, 5:29 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Otter Tail, Wilkin | 46 min |
| Aug 17, 5:49 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 41 min |
| Aug 17, 6:02 PM CDT | Severe Thunderstorm Warning | FGF | Grant | 43 min |
| Aug 17, 6:14 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 46 min |
| Aug 17, 2:08 PM CDT | Severe Thunderstorm Warning | FGF | Walsh | 52 min |
| Aug 17, 3:26 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Steele | 49 min |
| Aug 17, 3:42 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks, Walsh | 48 min |
| Aug 17, 3:55 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 50 min |
| Aug 17, 5:00 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 45 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2001Severe Thunderstorm Warnings in North Dakota, 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.