Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 133, NWS Grand Forks, ND

July 12, 1999Cavalier County, Towner County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 12, 1999, 8:02 PM CDT for Cavalier County, Towner County, North Dakota. It was in force for 48 min. 6 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 12, 1999, 8:02 PM CDT (01:02 UTC)
Expired: Jul 12, 1999, 8:50 PM CDT
In force: 48 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Cavalier County, ND, Towner County, ND

The radar

The Minot AFB radar (KMBX), 152 km from the middle of the area, began a volume at 01:03 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 12, 8:10 PM CDT	Hail 1	Hannah, ND
Jul 12, 8:10 PM CDT	Thunderstorm Wind 52	Hannah, ND
Jul 12, 8:11 PM CDT	Hail 1	Calvin, ND	Windows were broken by the hail.
Jul 12, 8:45 PM CDT	Hail 1.25	Langdon, ND	37,000 acres of wheat, canola, barley, and sunflowers were damaged by hail.
Jul 12, 9:00 PM CDT	Hail 1.75	Nekoma, ND
Jul 12, 9:00 PM CDT	Hail 1.5	Nekoma, 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 12, 8:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

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 12, 7:50 PM CDT, 12 minutes earlier.

Area forecast discussion, Jul 12, 7:50 PM CDT, 12 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
750 PM CDT MON JUL 12 1999

SEVERE THUNDERSTORM WATCH COORDINATED WITH SPS. MULTIPLE SUPERCELLS NOR
DROPPING SEWD INTO NORTHEAST ND...INTO VERY UNSTABLE AIRMASS WITH CAPES
APPCHG 4K AND LIS MINUS 8 TO MINUS 10 IN NRN PORTIONS OF THE RRV WHERE
DEWPTS ARE HOVERING AROUND 70 DEGREES. SFC TROF SAGGING INTO AREA HAS
BEEN GOOD FOCUS POINT AND CONVECTION LIKELY TO SAG SOUTH AND THEN PUSH
ACROSS EWD.

.FGF...SVR TSTM WATCH NORTHEAST NORTH DAKOTA AND NORTHWEST MINNESOTA
UNTIL 1AM CDT.

GUST

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 8:48 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	32 min
Jul 12, 9:18 PM CDT	Tornado Warning	FGF	Traill	32 min
Jul 12, 9:21 PM CDT	Tornado Warning	FGF	Ramsey, Walsh	34 min
Jul 12, 9:56 PM CDT	Tornado Warning	FGF	Ramsey, Walsh	34 min
Jul 12, 10:23 PM CDT	Severe Thunderstorm Warning	FGF	Nelson	32 min
Jul 12, 10:52 PM CDT	Severe Thunderstorm Warning	FGF	Nelson	33 min
Jul 12, 11:24 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	36 min
Jul 12, 10:43 PM CDT	Severe Thunderstorm Warning	FGF	Polk	32 min
Jul 12, 11:14 PM CDT	Severe Thunderstorm Warning	FGF	Polk	36 min
Jul 13, 12:29 AM CDT	Severe Thunderstorm Warning	FGF	Norman	36 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 1999 Every 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; radar from the NEXRAD Level II archive.