scholarly journals A Climatology of Operational Storm-Based Warnings: A Geospatial Analysis

2016 ◽  
Vol 32 (1) ◽  
pp. 47-60 ◽  
Author(s):  
David R. Harrison ◽  
Christopher D. Karstens
Keyword(s):  
Warning System ◽  
Weather Forecast ◽  
Geospatial Analysis ◽  
Mississippi Valley ◽  
Central Plains ◽  
Southern Plains ◽  
Lower Mississippi Valley ◽  
Local Maxima ◽  
Time Motion ◽  
Polygon Area

Abstract This study provides a quantitative climatological analysis of the fundamental geospatial components of storm-based warnings and offers insight into how the National Weather Service (NWS) uses the current storm-based warning system under the established directives and policies. From October 2007 through May 2016, the NWS issued over 500 000 storm-based warnings and severe weather statements (SVSs), primarily concentrated east of the Rocky Mountains. A geospatial analysis of these warning counts by county warning area (CWA) shows local maxima in the lower Mississippi valley, southern plains, central plains, and the southern Appalachians. Regional uniformity exists in the patterns of average speed and direction provided by the time/motion/location tags, while the mean duration and polygon area varies significantly by CWA and region. These observed consistencies and inconsistencies may be indicative of how local weather forecast office (WFO) policy and end-user needs factor into the warning issuance and update process. This research concludes with a comparison of storm-based warnings to NWS policy and an analysis of CWAs with the greatest number of warnings issued during a single convective day.

Presumed Trade and Aberrant Pottery

1949 ◽  
Vol 5 ◽  
pp. 130-145
Author(s):  
Alex D. Krieger
Keyword(s):  
Mississippi Valley ◽  
Lower Mississippi Valley ◽  
Great Range ◽  
Source Areas ◽  
Site Occupation ◽  
Foreign Origin ◽  
Pronounced Deviation

The pottery in the following sections is not considered to belong to the Alto Focus complex, but to occur with it at different points in the Davis site occupation by trade or other means. If the writer appears to vacillate over what is and what is not trade pottery here, it is due in part to the problem of separating what could have been produced at the site (as extreme variations of resident styles) from what probably was not (because of some distinctive attribute which would mark it as foreign). In certain cases of pronounced deviation, a foreign origin is obvious enough, particularly when the source areas are well known. But where the whole tradition is similar as in the clay-tempered pottery of the lower Mississippi Valley region, and a great range of decorative techniques was employed for long periods of time, the problem is not easy.

Loess stratigraphy of the Lower Mississippi Valley

1996 ◽  
Vol 45 (1-4) ◽  
pp. 167-183 ◽  
Author(s):  
E.M. Rutledge ◽  
M.J. Guccione ◽  
H.W. Markewich ◽  
D.A. Wysocki ◽  
L.B. Ward
Keyword(s):  
Mississippi Valley ◽  
Lower Mississippi Valley

scholarly journals A Mental Models Study of Hurricane Forecast and Warning Production, Communication, and Decision-Making*

2016 ◽  
Vol 8 (2) ◽  
pp. 111-129 ◽  
Author(s):  
Ann Bostrom ◽  
Rebecca E. Morss ◽  
Jeffrey K. Lazo ◽  
Julie L. Demuth ◽  
Heather Lazrus ◽  
...  
Keyword(s):  
Risk Communication ◽  
Mental Models ◽  
Warning System ◽  
Weather Forecast ◽  
Extreme Weather ◽  
South Florida ◽  
Extreme Weather Events ◽  
Research Approach ◽  
Action Context ◽  
Risk Decision

Abstract The study reported here explores how to enhance the public value of hurricane forecast and warning information by examining the entire warning process. A mental models research approach is applied to address three risk management tasks critical to warnings for extreme weather events: 1) understanding the risk decision and action context for hurricane warnings, 2) understanding the commonalities and conflicts in interpretations of that context and associated risks, and 3) exploring the practical implications of these insights for hurricane risk communication and management. To understand the risk decision and action context, the study develops a decision-focused model of the hurricane forecast and warning system on the basis of results from individual mental models interviews with forecasters from the National Hurricane Center (n = 4) and the Miami–South Florida Weather Forecast Office (n = 4), media broadcasters (n = 5), and public officials (n = 6), as well as a group decision-modeling session with a subset of the forecasters. Comparisons across professionals reveal numerous shared perceptions, as well as some critical differences. Implications for improving extreme weather event forecast and warning systems and risk communication are threefold: 1) promote thinking about forecast and warning decisions as a system, with informal as well as formal elements; 2) evaluate, coordinate, and consider controlling the proliferation of forecast and warning information products; and 3) further examine the interpretation and representation of uncertainty within the hurricane forecast and warning system as well as for users.

Age, genesis, and paleoclimatic interpretation of the Sangamon/Loveland complex in the Lower Mississippi Valley, U.S.A.

2010 ◽  
Vol 123 (1-2) ◽  
pp. 21-39 ◽  
Author(s):  
H. W. Markewich ◽  
D. A. Wysocki ◽  
M. J. Pavich ◽  
E. M. Rutledge
Keyword(s):  
Mississippi Valley ◽  
Lower Mississippi Valley

Basin-scale reconstruction of the geological context of human settlement: an example from the lower Mississippi Valley, USA

2008 ◽  
Vol 27 (11-12) ◽  
pp. 1255-1270 ◽  
Author(s):  
Tristram R. Kidder ◽  
Katherine A. Adelsberger ◽  
Lee J. Arco ◽  
Timothy M. Schilling
Keyword(s):  
Mississippi Valley ◽  
Human Settlement ◽  
Lower Mississippi Valley ◽  
Basin Scale ◽  
Geological Context

scholarly journals Weather forecast in north-western Greece: RISKMED warnings and verification of MM5 model

2010 ◽  
Vol 10 (2) ◽  
pp. 383-394 ◽  
Author(s):  
A. Bartzokas ◽  
V. Kotroni ◽  
K. Lagouvardos ◽  
C. J. Lolis ◽  
A. Gkikas ◽  
...  
Keyword(s):  
Air Temperature ◽  
Weather Forecasting ◽  
Precipitation Amount ◽  
Warning System ◽  
Weather Forecast ◽  
Early Morning ◽  
Meteorological Model ◽  
Adverse Weather ◽  
North Western ◽  
Western Greece

Abstract. The meteorological model MM5 is applied operationally for the area of north-western Greece for one-year period (1 June 2007–31 May 2008). The model output is used for daily weather forecasting over the area. An early warning system is developed, by dividing the study area in 16 sub-regions and defining specific thresholds for issuing alerts for adverse weather phenomena. The verification of the model is carried out by comparing the model results with observations from three automatic meteorological stations. For air temperature and wind speed, correlation coefficients and biases are calculated, revealing that there is a significant overestimation of the early morning air temperature. For precipitation amount, yes/no contingency tables are constructed for 4 specific thresholds and some categorical statistics are applied, showing that the prediction of precipitation in the area under study is generally satisfactory. Finally, the thunderstorm warnings issued by the system are verified against the observed lightning activity.

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