Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 162, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 22, 1999, 3:49 AM CDT for Benson County, Eddy County, North Dakota. It was in force for 46 min. 1 report 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 22, 1999, 3:49 AM CDT (08:49 UTC)
- Expired
- Jul 22, 1999, 4:35 AM CDT
- In force
- 46 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Benson County, ND, Eddy County, ND
The radar
The Minot AFB radar (KMBX), 140 km from the middle of the area, began a volume at 08:52 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 22, 3:50 AM CDT | Hail 0.75 | Maddock, 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 22, 3:45 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 8.8 hours before the alert went out and 172 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
- 3546 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 1477 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 15.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 22, 3:25 AM CDT, 24 minutes earlier.
Area forecast discussion, Jul 22, 3:25 AM CDT, 24 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 325 AM CDT THU JUL 22 1999 FCST CHALLENGE: SVR TSTM THREAT TODAY...QPF. MODEL SELECTION: ETA CARRYING THE BALL THIS WEEK. CLOSED SFC LOW PLACEMENT AT 06Z HANDLED WELL BY ETA ALG WITH LOW LEVEL INSTABILITY PARAMETERS. SIGNIFICANT DIFFERENCE BETWEEN ETA AND NGM ON INITIALIZATION OF DOUBLE VORT PULLING NEWD FROM MT/AB FRONT RANGE. ETA MAINTAINS STRENGTH OF SRN VORT AND PULLS SIG UVVS THROUGH ND INTO NWRN MN THROUGH 24HRS. NEAR TERM: SFC LOW DEEPENING IN SWRN ND WITH SFC BOUNDARY THROUGH NRN ND TO NRN RRV. DEWPTS IN UPER 60S TO LOW 70S ACROSS NRN FGF CWFA WITH SFC BASED LIS STILL IN MINUS 5 OR 6 RANGE. THETAE RIDGE IN CNTRL ND LEANING EWD INTO NWRN MN BY 18Z. MODERATE INSTABILITY EXISTS NOW...AND WITH SIG UVVS PROGGED TO TRACK THROUGH TDY EXPECT STRONG TO SVR TSTM ACTIVITY MOST AREAS. FIRST THREAT AREA WILL BE NERN ND THIS AM AS BOW ECHO PATTERN MOVES ACROSS NRN ND. LOW LEVEL SHEAR PROFILE AND INSTABILITIES WILL SUPPORT SUPPERCELL DEVLPMNT THROUGH MIDDAY WHILE 50KT MID LEVEL JET IS TRACKING ACROSS ND ATTM. MODERATE INSTABILITIES CONTINUE THROUGH THIS AFTERNOON...HOWEVER LOW LEVEL SHEAR PROFILES DIMINISH SOMEWHAT. EXPECT SVR THREAT TO SHIFT INTO NWRN MN THIS AFTERNOON AND EVENING. MID TERM: RIDGE REBOUNDS SLIGHTLY OVR CNTRL ND AND THETAE RIDGE ROCKS BACK TO CNTRL AND ERN ND...WAITING FOR NEXT IMPULSE IN THE FLOW. FRIDAY LOOKS TO BE A BETWEEN SYSTEMS DAY THOUGH THERE WILL BE LITTLE RELIEF FROM THE HEAT AND HUMIDITY. EXTENDED: NOT MUCH TIME TO LOOK DEEP INTO EXTENDED. 00Z AVN CONTINUES TO TARGET SAT PM AND SUNDAY AS NEXT TSTM DAY...WITH LITTLE FOCUSED ACTIVITY FRIDAY NIGHT INTO SATURDAY. COORD WITH SPC...BIS AND MSP .FGF...SVR TSTM WATCH 568 FOR NORTHEAST ND AND EXTREME NW MN UNTIL 9AM CDT. GUST
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 4:23 AM CDT | Severe Thunderstorm Warning | FGF | Ramsey, Towner | 47 min |
| Jul 22, 5:11 AM CDT | Severe Thunderstorm Warning | FGF | Ramsey | 34 min |
| Jul 22, 5:25 AM CDT | Tornado Warning | FGF | Ramsey | 35 min |
| Jul 22, 5:48 AM CDT | Tornado Warning | FGF | Nelson | 32 min |
| Jul 22, 5:56 AM CDT | Severe Thunderstorm Warning | FGF | Griggs | 34 min |
| Jul 22, 6:24 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 31 min |
| Jul 22, 6:54 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 46 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1999Every severe thunderstorm warning in 1999
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.