Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 347, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 21, 2001, 8:16 PM CDT for Cavalier County, Towner County, North Dakota. It was in force for 44 min. 2 reports 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 21, 2001, 8:16 PM CDT (01:16 UTC)
- Expired
- Aug 21, 2001, 9:00 PM CDT
- In force
- 44 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Cavalier County, ND, Towner County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 8:20 PM CDT | Hail 1.75 | Hansboro, ND | |
| Aug 21, 8:30 PM CDT | Hail 0.75 | Calvin, 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 1.3 hours before the alert went out and 267 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
- 2988 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 1541 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
802 WUUS53 KFGF 220116 SVRFAR NDC019-095-220200- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 816 PM CDT TUE AUG 21 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN TOWNER COUNTY IN NORTH CENTRAL NORTH DAKOTA AND WESTERN CAVALIER COUNTY IN NORTHEAST NORTH DAKOTA. * UNTIL 900 PM CDT. * AT 810 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF SARLES...OR ABOUT 35 MILES WEST OF LANGDON...MOVEMENT WAS TO THE SOUTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CALVIN AT 835 PM... CLYDE AT 850 PM AND MUNICH AT 900 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4906 9894 4892 9930 4851 9884 4871 9855 $$ BERG 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 21, 2:05 PM CDT, 6 hours 11 minutes earlier.
Area forecast discussion, Aug 21, 2:05 PM CDT, 6 hours 11 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 205 PM CDT TUE AUG 21 2001 CONVECTIVE THREAT IS THE MAIN FORECAST CHALLENGE TONIGHT. MODELS IN REASONABLE AGREEMENT IN THE UPPER LEVEL FEATURES FOR THE NEXT 48 HOURS BUT THERE ARE SOME MINOR DIFFERENCES AT THE SFC/850 MB. IN THE SHORT TERM...ETA DOING BEST WITH SFC TEMPS WHILE AVN BEST WITH THE SLOW EASTWARD PROGRESSION OF THE SFC FRONT. LIKE THE DRIER QPF WITH THE ETA...SO WILL USE A BLEND OF THE ETA AND AVN. FRONT PUSHES INTO THE NORTHERN VALLEY AFTER 00Z TONIGHT. SFC/850 MB FORCING ALONG THE FRONT HAS BEEN WEAK ALL DAY AND THIS REMAINS THE CASE TONIGHT. BEST FORCING IS IN ONTARIO AND THE CENTRAL PLAINS. UPPER SUPPORT ALSO WEAK...BUT AGREE WITH SPC SWODY1 THAT CANADIAN BORDER REGION IN NORTHWEST MN STANDS THE BEST CHANCE OF AN ISOLATED STORM. FWC/MAV GUIDANCE CLOSE AND WILL FOLLOW. SFC HIGH PRESSURE BUILDS INTO THE REGION ON WED WITH NORTHEAST WIND FLOW ADVECTING IN DRIER AIR. AVN HANGING UP FRONTAL BOUNDARY ALONG A KISN TO KBDE LINE WITH MAX QPF AT 12Z WED. ETA FRONTAL POSITION MUCH FURTHER EAST. THEREFORE ETA SHOWS CAPE AROUND 1200 J/KG WITH LIS AT -5 ACROSS SOUTHEAST ZONES AT 12Z WED. HOWEVER...ONCE AGAIN AREA UNDER NVA AND Q VECTOR DIVERGENCE. 300 MB WINDS STARTING TO BECOME RATHER ANEMIC IN THE MORNING. SO WILL NOT CARRY A LOW POP EARLY WED ACROSS THE SOUTHEAST ZONES. SOME COOLING IN THE 850-700 MB LAYER ESPECIALLY IN NORTHEAST ZONES...SO MOST AREAS WILL SEE TEMPS SIMILAR TO TODAY OR SLIGHTLY COOLER. GOOD DRYING WED NIGHT WITH COOLER TEMPS AS A RESULT OF THE DRIER AIR. RETURN FLOW SETS UP ON THU WHILE PRESSURE GRADIENT BEGINS TO TIGHTEN ACROSS WESTERN AND CENTRAL ND. .EXTENDED...LARGE SCALE PATTERN CHANGE WILL TAKE PLACE DURING THE EXTENDED PERIOD AS UPPER LEVEL TROUGH CURRENTLY OVER THE PACIFIC NORTHWEST DIGS INTO THE CENTER OF THE CONTINENT. EXTENDED MODELS AGREE ON GENERAL DETAILS. THUNDERSTORMS ARE EXPECTED FRIDAY INTO EARLY SATURDAY ALONG AND AHEAD OF SIGNIFICANT FROPA. A HINT OF SEPTEMBER-LIKE WEATHER SHOULD BE IN PLACE FOR THE WEEKEND WITH RETURN FLOW STARTING A SLOW WARMING TREND ON TUESDAY. .FGF...NONE. GODON/BRAMER
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:28 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Towner | 47 min |
| Aug 22, 12:45 AM CDT | Severe Thunderstorm Warning | FGF | Pembina | 60 min |
Nearby
Severe 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.