Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 142, NWS Grand Forks, ND

July 13, 1999Benson County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 13, 1999, 11:47 PM CDT for Benson County, North Dakota. It was in force for 33 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 13, 1999, 11:47 PM CDT (04:47 UTC)
Expired
Jul 14, 1999, 12:20 AM CDT
In force
33 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Benson County, ND

The radar

The Minot AFB radar (KMBX), 117 km from the middle of the area, began a volume at 04:50 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

TimeReportWhereRemark
Jul 14, 12:00 AM CDTHail 1.5Maddock, 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.

IssuedProductOfficeLasted
Jul 13, 9:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.8 hours before the alert went out and 176 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.

Skew-T log-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 1999-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2357 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 1999-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2357 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
1627 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.0

Open this sounding in Storm Lab

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 13, 8:20 PM CDT, 3 hours 27 minutes earlier.

Area forecast discussion, Jul 13, 8:20 PM CDT, 3 hours 27 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
820 PM CDT TUE JUL 13 1999

RISK OF SEVERE THUNDERSTORM ACTIVITY IS DEVELOPING IN NORTHEAST
NORTH DAKOTA. UPDATE WILL FOLLOW AS SEVERE THUNDERSTORM WATCH BOX IS
EXTENDED INTO NERN ND AND EXTREME NWRD MN.

SURFACE ANALYSIS PLOTS HAVE SHOWN SURFACE MOISTURE FIELDS RESPONDING
TO APPCHG SFC TROF...WHICH EXTENDS FROM YPG TO MOT TO DIK. HIGHEST
DEWPOINTS IN NRN RRV ALSO RELATE TO HIGHEST SFC LIS...WITH CAPES
APPCHG 3500 IN EXTREME NERN ND. DEVELOPING MCS NEAR MOT WILL LIKELY
ENTER EXTREME WRN FGF ZONES IN NEXT 2 HOURS WHILE TSTMS FROM SRN
MANITOBA COULD ENTER EXTREME NERN ZONES WITHIN THE HOUR. LOWER LEVEL
WIND SHEARS THROUGH ERN ND ARE NOT AS STRONG AS WESTERN AND CNTRL ND
BUT STILL FAVORABLE FOR SUPERCELL DEVELOPMENT...HAIL THE LIKELY
THREAT.

EXPECT AIRMASS TO STABILIZE SLIGHTLY AFTER DARK WITH TRANSITION TO
HEAVY RAIN INTO MN ZONES POSSIBLE. NO STRONG MID LEVEL JET EVIDENT
ON KMBX VWP THOUGH BIS SOUNDING HAS ABOUT 50KTS AT H5. BOW ECHO
DEVELOPMENT THREAT APPEARS SLIGHT...BUT WONT ENTIRELY DISCOUNT IT.
JET HAS SAGGED APPRECIABLY IN LAST 24HRS.

COORD WITH SPC.

.FGF...SVR TSTM WATCH PENDING.

GUST

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 10:24 PM CDTTornado WarningFGFRamsey31 min
Jul 13, 10:52 PM CDTTornado WarningFGFRamsey33 min
Jul 13, 11:02 PM CDTTornado WarningFGFNelson, Walsh33 min
Jul 13, 11:19 PM CDTSevere Thunderstorm WarningFGFEddy31 min
Jul 13, 11:35 PM CDTTornado WarningFGFGrand Forks, Walsh30 min
Jul 14, 12:30 AM CDTTornado WarningFGFWalsh35 min
Jul 14, 12:32 AM CDTSevere Thunderstorm WarningFGFEddy33 min
Jul 14, 12:42 AM CDTSevere Thunderstorm WarningFGFGrand Forks33 min
Jul 14, 1:46 AM CDTSevere Thunderstorm WarningFGFEddy34 min
Jul 14, 12:55 AM CDTTornado WarningFGFMarshall, Polk30 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.