Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 158, NWS Bismarck, ND

August 11, 1999Slope County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 11, 1999, 4:32 PM MDT for Slope County, North Dakota. It was in force for 58 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: Aug 11, 1999, 4:32 PM MDT (22:32 UTC)
Expired: Aug 11, 1999, 5:30 PM MDT
In force: 58 min
Issued by: NWS Bismarck, ND
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Slope County, ND

The radar

The Bismarck radar (KBIS), 209 km from the middle of the area, began a volume at 22:33 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
Aug 11, 4:50 PM MDT	Hail 0.88	Amidon, 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
Aug 11, 2:30 PM MDT	Tornado Watch	SPC	7 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 Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 2:05 PM MDT, 2 hours 27 minutes earlier.

Area forecast discussion, Aug 11, 2:05 PM MDT, 2 hours 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BISMARCK ND
305 PM CDT WED AUG 11 1999

...THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS EXPECTED IN SRN
ND TGT...
AT 19Z SFC LOW PRES WAS IN NW TIP OF SD WITH WARM FRONT ALONG ND/SD
BRDR. SUNSHINE AND MSTR CONVERGENCE ALONG WARM FRONT HAVE BOOSTED
LI/S TO -8 IN SWRN ND THIS AFTN. STORMS IN SERN MT SHOULD REALLY
TAKE OFF AS THEY ENTER SWRN ND. K-INDEX OF 35+ AND STRONG SFC
CONVERGENCE WL LEAD TO AREAS OF HEAVY RAIN (1-3) INCHES IN SRN ND
TGT.

BOTH NGM/ETA DEEPEN LOW TGT WITH APPROACHING UPPER LEVEL S/W.
LOW FCST TO MOVE TO ECNTRL SD BY 12Z...ALLOWING COOL CANADIAN AIR TO
OVERSPREAD ND. LOW CLOUDS AND RAIN EXPECTED BEHIND CANADIAN CDFNT
COMBINED WITH NE WINDS TO CREATE FALL LIKE WEATHER THU. NGM MOS
DROPPED FCST HIGHS BY 10 DEGREES THU. THIS IS GREAT CONSIDERING
TEMPS WERE IN M60S IN SRN CANADA THIS AFTN. PCPN SHOULD END IN NWRN
ND B4 AFTN BUT MAY CONTINUE NEAR JMS ALL DAY. HIGH PRES MOVES THRU
AREA THU NGT ALLOWING SERLY RETURN FLOW AND PS SKIES ON FRI. LOW
PRES REDEVELOPS IN ERN MT ON FRI SO WILL KEEP CHC TSRA IN FAR WRN ND
FRI AFTN AND EVENING.

IN THE EXTENDED FCST...A FAST W-E FLOW DVLPS OVR ND WITH A GENERAL
AREA OF LOW PRES OVER THE DAKOTAS. WL BROAD BRUSH EXTENDED WITH CHC
TSTMS EACH DAY AS TIMING WILL BE A PROBLEM.

.BIS...NONE.
NOAH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 11:57 PM MDT	Severe Thunderstorm Warning	BIS	Rolette	63 min
Aug 11, 5:05 PM MDT	Severe Thunderstorm Warning	BIS	Bowman	40 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.