Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 192, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 1998, 4:37 PM CDT for Richland County, North Dakota. It was in force for 33 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
- Jul 20, 1998, 4:37 PM CDT (21:37 UTC)
- Expired
- Jul 20, 1998, 5:10 PM CDT
- In force
- 33 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Richland County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 143 km from the middle of the area, began a volume at 21:39 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 20, 5:00 PM CDT | Hail 0.75 | Mantador, ND | |
| Jul 20, 5:17 PM CDT | Hail 1 | Hankinson, 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 20, 2:15 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 9.6 hours before the alert went out and 189 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
- 2746 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 202136 RRA SVRFAR NDC077-202210- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 437 PM CDT MON JUL 20 1998 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN RICHLAND COUNTY IN SOUTHEASTERN NORTH DAKOTA * UNTIL 510 PM CDT * AT 434 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR WYNDMERE OR 25 MILES WEST OF WAHPETON. MOVEMENT WAS SOUTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MANTADOR AT 458 PM CDT HANKINSON AT 505 PM CDT REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY PRODUCE TORNADOES WITH LITTLE OR NO ADVHANCED WARNING. EWENS
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 20, 3:00 PM CDT, 1 hour 37 minutes earlier.
Area forecast discussion, Jul 20, 3:00 PM CDT, 1 hour 37 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 300 PM CDT MON JUL 20 1998 FIRST PERIOD DISCUSSION...ADAP SHOWING GOOD MSTR FLUX CONVERENGCE FM TVF TO SARGENT CNTY ND. LIS WERE ALSO QUITE LOW AND THE CAP WAS WEAKEST IN THE SAME AREA. UPR LVL JET MOVG ALNG THE INTERNATIONAL BDR WITH STRMS LIKELY TO FIRE IN RFQ AS WARM MOIST AIR GETS LIFTED UNDER JET INDUCED SUBSIDENCE. STRMS FIRING UP ARND TVF. STLT SHOWING A LINE OF ENHANCED CU FM TVF TO DICKEY CNTY ND. WATER VAPOR LOOP ALSO HAS HIR MID LVL MSTR MOVG IN. SHOULD SEE STRMS DEVELOP ALONG MOIST/DRY INTERFACE AND ALONG SFC FNT. WNDS HAVE BECM NW W SFC CU LINE ON STLT. XPC STRMS TO DEVELOP ALNG FNTL BNDRY AND ESPECIALLY WHERE FNTL BNDRY WOULD INTERSECT MOIST/DRY INTERFACE. CLRG SHOULD FOLLOW STRMS ACTIVITY TNGT XCP ALNG INTERNATIONAL BDR WHERE MORE CLDS ARE XPCD. AS FAR AS TEMPS MOS SEEMS A LITTLE WARM WITH DWPNTS IN THE UPR 40S IN WRN ND HOWEVER UPR 50S DWPNTS WERE IN SRN MAN. TEMPS SHOUD BE WARMER ALNG THE NRN BDR WITH HIR DWPNTS AND CLDS BY MORN...COOLER IN THE S. THINK LOWS WL BE IN THE MID 50S IN FAR, FFM, DTL, PKD...AND UPR 50S GFK, FSE, BJI, DVL...ARND 60 IN HCO, ROX, BDE. HOPPES
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 10:02 AM CDT | Severe Thunderstorm Warning | FGF | Pembina | 33 min |
| Jul 20, 3:06 PM CDT | Severe Thunderstorm Warning | FGF | Ransom | 34 min |
| Jul 20, 3:37 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland | 33 min |
| Jul 20, 4:08 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 32 min |
| Jul 20, 5:12 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 33 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1998Every severe thunderstorm warning in 1998
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.