Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 218, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 16, 2002, 8:25 PM CDT for Cass County, North Dakota. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 16, 2002, 8:25 PM CDT (01:25 UTC)
- Expired
- Aug 16, 2002, 9:15 PM CDT
- In force
- 50 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Cass County, ND
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 16, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 1.4 hours before the alert went out and 254 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
- 134 J/kg
- Mixed-layer CIN
- -501 J/kg
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 272 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
079 WUUS53 KFGF 170125 SVRFAR NDC017-170215- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 824 PM CDT FRI AUG 16 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CASS COUNTY IN SOUTHEAST NORTH DAKOTA. * UNTIL 915 PM CDT. * AT 819 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES SOUTHWEST OF AYR...OR ABOUT 23 MILES EAST OF VALLEY CITY...MOVEMENT WAS TO THE NORTHEAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... AYR AT 825 PM... ERIE AT 830 PM... ARTHUR AT 840 PM AND GARDNER AT 855 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4706 9766 4690 9756 4705 9684 4723 9689 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 16, 3:30 PM CDT, 4 hours 55 minutes earlier.
Area forecast discussion, Aug 16, 3:30 PM CDT, 4 hours 55 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 330 PM CDT FRI AUG 16 2002 .SHORT TERM... STRONG, FAST OPEN UPPER LEVEL TROUGH OVER MT FORECAST TO MOVE OVER THE RED RIVER VALLEY TONIGHT AND CLOSE OFF. ALSO UPPER TROUGH AXIS FORECAST TO ROTATE TO A NEGATIVE TILT. MID LEVEL MOISTURE CONTINUES TO MOVE INTO THE REGION THIS AFTERNOON. LOW LEVEL MOISTURE TO INCREASE THIS EVENING BEFORE A COLD FRONT WILL MOVE THROUGH. CAPES RISE TO AROUND A 1000 J/KG THIS EVENING IN THE SOUTHERN ZONES. RESPECTABLE 330K 850 MB THETA-E AIR ADVECTS AHEAD OF COLD FRONT THIS EVENING AGAIN EMPHASIZING THE SOUTHERN ZONES. SEVERE THREAT OF THUNDERSTORMS WILL BE MOST LIKELY IN THE SOUTHERN ZONES THIS EVENING. BETTER THAN A 10MB DROP FORECAST ON THE PREVIOUS MODEL RUN HOWEVER NEW ETA RUN BACKING OFF WITH AN 8 MB DROP BETWEEN MIDNIGHT AND NOON SATURDAY. GOOD COLD AIR ADVECTION TO OCCUR THROUGHOUT MOST OF THE LOWER TROPOSPHERE. STRONG PRESSURE RISES, GOOD RISE-FALL COUPLET, RELATIVELY LITTLE DIRECTIONAL WIND SHEAR AND WINDS UP TO 50 KNOTS AT 850 MB FORECAST OVERNIGHT ACROSS THE CWFA. BEST CHANCE FOR HIGH WINDS WILL BE ACROSS THE SOUTHERN HALF OF THE CWFA FROM NEAR MIDNIGHT TO NOON SATURDAY. WILL ISSUE A HIGH WIND WATCH ALL ZONES FOR TONIGHT AND SATURDAY. MSP, DLH, AND BIS COORDINATED. .EXTENDED... STRONG CORE OF UPPER LEVEL WESTERLIES SHOULD CONTINUE TO SQUASH 500MB RIDGE FROM DESERT SOUTHWEST TO SOUTHEAST CONUS THROUGH PERIOD. ABOVE REGIME WILL CIRCULATE FAST WEST TO NORTHWEST FLOW ALOFT ACROSS THE NORTHERN PLAINS WITH EMBEDDED SHOTS OF SHORTWAVE ENERGY RIDING EAST ALONG FLOW. INHERITED SCATTERED POP THREAT TUESDAY IN CONJUNCTION WITH TROUGH PASSAGE STILL LOOKS FEASIBLE. BESIDES THAT CHANCE IT APPEARS MAIN ACTION SHOULD BE TO THE SOUTH DURING THE REMAINDER OF THE WEEK AS BOUNDARY GETS HUNG UP FROM THE CENTRAL PLAINS EAST AS UPPER LEVEL FLOW IMPEDES SOUTHWARD PUSH. GENERAL TRAJECTORY THROUGH PERIOD CONTINUES FROM CANADA...THUS NO BIG WARMUPS IN SIGHT. FGF...HIGH WIND WATCH TONIGHT AND SATURDAY ALL ZONES. HOPPES
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 9:01 PM CDT | Severe Thunderstorm Warning | FGF | Traill | 29 min |
| Aug 16, 9:22 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 38 min |
| Aug 16, 9:37 PM CDT | Severe Thunderstorm Warning | FGF | Ransom | 38 min |
| Aug 16, 10:03 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 42 min |
| Aug 16, 10:11 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 49 min |
| Aug 16, 10:13 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 47 min |
| Aug 16, 10:16 PM CDT | Severe Thunderstorm Warning | FGF | Ransom | 29 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2002Every 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; the sounding from the Mesonet's radiosonde archive.